MSC.Nastran--the only complete multidisciplinary simulation program
Editor：AdminTime:2017-06-21 13:00:54
MSC has introduced the next generation of explosive new products, it is also the world's manufacturers dream of product development competition weapon. Due to the constraints of high cost, strict specification and certification requirements, manufacturing and follow-up services, and many industrial factors, it is now more challenging than ever to introduce a new product that meets the needs of today's enterprise simulation design. Sex, but also imperative.
It also explains why the world's leading manufacturers and suppliers rely on MSC.Software's solutions to revolutionize their product development process. As a global provider of virtual development tools, MSC.Software is able to ensure that manufacturers achieve accelerated time-to-market, maximize return on investment and ensure a competitive market leadership.
MSC.Software's enterprise simulation solution uses a detailed digital product model to simulate and verify the performance of all aspects of the product, develop and track rigorous design goals, communicate and coordinate product development, so that product innovation and quality to a more competitive new Level.
"When you ask for rotor dynamics analysis, such as leaf analysis, no other solver can do such a synthetic simulation."
"These models are unimaginable - hundreds of millions of degrees of freedom, MSC.Nastran is the only solver that can consider such a large scale and still be able to get accurate results after being reduced to a smaller model."
Dr.Charles Lawrence
Structures and Acoustics Division, Glenn Research Centerat LewisField, NASA.
Challenges for Enterprise Product R & D
Accelerate product innovation and maintain competitive advantage
Enterprises continue to develop new products and improve the pace of products, and accelerate time to market, improve quality, meet the standards and reduce the design and manufacturing costs and so on. The need for new product development is obvious: the need for new development process to significantly improve product innovation and market share.
Multidisciplinary simulation fits these challenges to enable manufacturers to emulate and validate performance in all aspects of the product. By removing the fetters that can only be used for independent analysis of individual disciplines, engineers can better understand the characteristics of the product and design and know how it works in a real working environment before doing product physical prototyping. As products and assemblies become more complex, manufacturers need to have simulation solutions that can handle complex and large-scale problems both easily and accurately.
MSC.Nastran—a leader in multidisciplinary simulation in the industrial sector
In order to apply the most comprehensive simulation analysis technology to all areas, MSC.Nastran provides true multidisciplinary simulation through a fully integrated system. MSC.Nastran multidisciplinary simulation has been greatly expanded since 2001. First, the traditional first-class static mechanics and dynamics have been effectively enhanced, and then integrated into the first-class implicit nonlinear, explicit nonlinear, multi-body Dynamics and acoustic analysis. MSC.Nastran gives the most accurate description of the continuous continuum of physical phenomena. MSC.Nastran in-depth development has gone through six years, on the one hand through the strategic acquisition, Adams kinematics / dynamics, Marc nonlinear technology into them. On the other hand, through the strategic cooperation, LS-Dyna's highly transient non-linear embedded Nastran enhanced collision function, the Actran infinite unit technology into Nastran to achieve internal and external sound field simulation capabilities, follow the introduction of universal embedded CFD interface and Control analysis and other disciplines of the simulation function. MSC.Nastran compared to the traditional single-point simulation tool, based on the overall cost reduction, providing a more rapid, more realistic product performance and processing simulation.
By providing superior parallel design simulation capabilities, MSC.Nastran enables companies to:
Products are more quickly delivered to the market—quickly and thoroughly understand the entire design performance, can make the design cycle is shorter than 50%.
Lower manufacturing costs - Earlier understanding of the performance of the design product in the design process, enabling the discovery and modification of defects before the design is approved. At the same time, it is possible to determine machinability earlier, optimize manufacturing time, reduce material margins and prevent unnecessary equipment investment.
Improved analytical efficiency - support for common analytical data models avoids the error of manual delivery of information and data between different disciplines.
Improve product quality and reduce maintenance costs—By accurately describing the complex interactions between disciplines, MSC.Nastran simulation results more accurately reflect the real results, eliminating the use of unexpected errors in the use of the process.
MSC.Nastran analysis function
1.Static analysis
MSC.Nastran's static analysis function supports a full range of material patterns, including: homogeneous isotropic materials, orthogonal heterosexual materials, various heterosexual materials and materials with temperature changes. The main types of analysis are:
Static analysis with inertial release: Considering the inertia of the structure, the quasi-static response of the unconstrained free structure under static load and acceleration can be calculated
In linear static analysis, contact and bonding can be defined to provide a convenient and accurate method for the linear analysis of assemblies.
Nonlinear static analysis, can analyze large nonlinear geometrical nonlinearity, plasticity and creep material nonlinearity and large slip contact nonlinearity and so on.
2.Buckling analysis
The buckling analysis is mainly used to study the stability of the structure under specific loads and to determine the critical load of structural instability. The buckling analysis of MSC.Nastran includes:
Linear buckling: fixed preload can be considered, or inertial release can also be used.
Nonlinear buckling: including large deformation geometric nonlinear instability analysis, material nonlinearity elasto-plastic instability analysis and can track the unstable path of the nonlinear post-buckling (Snap-through) analysis.
3.Kinetics analysis
Structural dynamics analysis is one of the most important strengths of MSC.Nastran, which has powerful analysis capabilities that can not be compared with other finite element analysis software. MSC.Nastran dynamics analysis includes time domain transient response and frequency domain frequency response analysis, the method has a direct integration method and modal method, taking into account the various damping such as structural damping, material damping and modal damping effect The MSC.Nastran dynamic response analysis can accurately predict the dynamic characteristics of the structure, greatly improve the maturity of virtual product development, improve the physical prototype product quality.
The structural dynamic response analysis of the load with time and frequency changes includes:
Regular Modal and Complex Eigenvalue Analysis
Nonlinear Modal (ie, Prestressed Modal) and Complex Eigenvalue Analysis
Frequency response analysis
Transient response analysis
Forced motion analysis
(Noise) acoustic analysis
Random vibration response analysis
Response and shock spectrum analysis
Dynamic sensitivity and optimization analysis
MSC.Nastran not only can solve the frequency response function of components and assemblies, but also has the frequency response function assembly function, through the frequency response function assembly, component or subsystem by the frequency response function to get the entire assembly frequency response function, The coupling between the components to determine the vibration and noise transmission path for the vibration and noise reduction to provide engineering guidance.
For small and small problems of different problem-solving scale, users can also choose a flexible choice of MSC.Nastran different dynamic methods to solve, such as large-scale structural dynamics problems, can be used feature reduction techniques and substructure analysis methods.
4.Automatic component modal synthesis method - ACMS
ACMS (Automated Component Mode Synthesis) automatic component modal synthesis method, so that engineers can achieve large-scale model of dynamic response analysis and sound field analysis, ACMS method will automatically a small model or a regional decomposition method is automatically divided into several sub-regions The modal analysis of each sub-structure, and then the modal synthesis, which can be the overall structure of the dynamic characteristics. ACMS method can greatly reduce the calculation time of large models, such as nearly 14 million degrees of freedom of the car model (500Hz 2500 mode), the use of the whole model of the standard modal frequency response SOL 111 to solve with about 26 hours Using MSC.Nastran ACMS method takes only 4 hours, while taking up the computing resources are greatly reduced, so the use of MSC.Nastran automatic modal synthesis technology for large-scale structural dynamic analysis, such as aircraft, vehicles, ships, bridges, etc. Structure, can be in the accuracy and speed to provide a good solution.
In MSC.Nastran, the automatic component modal synthesis method (ACMS) has been greatly enhanced, and the matrix domain automatic component modal synthesis method (MSC.ACMS) has been added. This method is based on the DOF calculation and the existing geometric domain (GDACMS) is faster than the calculation method, and the more complex the model, the more obvious the efficiency of the calculation can be applied to the modal analysis, frequency response analysis and optimization analysis. For the multi-point constraint (MPC) In the case of higher efficiency.
A variety of regional partitioning methods (with the type of change)
Geometric area division (for SOL 103, 111, 112,200)
Frequency domain division (for SOL 111,200)
DOF field (for SOL 103,111,200) - new default method
Geometric domain combined with frequency domain (for SOL 111,200)
Matrix field combined with frequency domain (for SOL 200)
Applied to different solution types:
MSC.Nastran Dynamic Analysis (SOL 103, 111, 112)
MSC.Nastran Acoustic Analysis (SOL 108)
MSC.Nastran Design Optimization (SOL 200)
MSC.Nastran and ADAMS integration
Structure of external supercell technology
Acoustic external supercell technology (including fluid cavities and fluid-solid boundaries)
MSC.Nastran ACMS technology can be combined with distributed domain parallel computing technology (DMP), the frequency range is wide and there are multiple dynamic load of the complex model can be described as even more powerful, can greatly improve the calculation speed and accuracy.
5.Thermal analysis
Thermal conductivity analysis is usually used to verify the structural characteristics of structural parts under thermal boundary conditions or thermal conditions. MSC.Nastran can be used to calculate the temperature distribution within the structure and visually see latent heat, hot spot locations and distributions in the structure. The user can optimize the thermal performance of the product by changing the location of the heat generating element, increasing the means of heat dissipation, adiabatic treatment, or otherwise using the method.
MSC.Nastran can solve the heat exchange phenomena including conduction, convection, radiation, phase change and thermal control system, calculate the radiation angle coefficient, and simulate all kinds of boundary conditions, establish various complex materials and geometric models, simulate Thermal control system for thermal - structural coupling analysis.
MSC.Nastran provides a linear, nonlinear solution algorithm for steady-state and transient thermal analysis. The non-linear function automatically optimizes the time step according to the selected solution method.
Linear / non-linear steady-state heat transfer analysis: Linear thermal conduction analysis based on steady-state is generally used to solve the temperature distribution in a structure under given hot load and boundary conditions. The calculated results include the temperature of the node, the thermal load of the constraint and the The temperature gradient and the temperature of the nodes can be further used to calculate the response of the structure. The steady-state nonlinear heat conduction analysis is based on the full function of the steady-state linear heat conduction. It is also possible to consider the non-linear radiation-related thermal conductivity and convection Problems and so on.
Linear / Nonlinear Transient Heat Transfer Analysis: Linear / nonlinear transient heat transfer analysis is used to solve the transient temperature response under time-varying loads and boundary conditions, taking into account thin film heat conduction, unsteady convective heat transfer and emissivity, absorption Non-linear radiation with temperature change.
Phase change analysis: This analysis, as a more specific transient thermal analysis process, is commonly used for the analysis of heat transfer analysis of solidification and dissolution of materials, such as metal forming problems. This process is expressed in MSC.Nastran as a function of the enthalpy and temperature, which greatly improves the accuracy of the analysis.
Thermal control analysis: MSC.Nastran can carry out various types of thermal control system analysis, including the model of positioning, deletion, time-varying thermal control, such as modern building room temperature rise or lower control. The heat transfer coefficient of the free convection element can be controlled according to the forced convection rate, the heat flow load and the internal heat generation rate. The thermal load and the boundary condition can be defined as the nonlinear load with time.
Chain analysis: steady-state thermal analysis results as the initial conditions for transient thermal analysis, thermal analysis results as an initial condition for structural analysis.
6.Analysis of Pneumatic Elasticity and Flutter
High-speed vehicles and high-speed airflow will produce deformation and elastic vibrations under aerodynamic and airflow disturbances, which in turn cause additional aerodynamic forces and additional aerodynamic forces create additional deformation and motion. Pneumatic elastic mechanics is to study the aerodynamic, elastic and inertial forces between the interaction and the resulting impact on the design of aircraft edge of a subject. The essence of the flutter phenomenon is the elasticity of the elasticity.
The aerodynamic elasticity problem involves the interaction between aerodynamic, inertial and structural forces. The aerodynamic elastic module of MSC.Nastran can be used for airborne elasticity analysis and design of aircraft, helicopters, missiles, suspension bridges and even chimneys and high voltage lines. The aerodynamic elastic analysis function of MSC.Nastran mainly includes:
Analysis of static gas bomb response
Dynamic aerodynamic response analysis (including: modal frequency response, modal transient response, random response analysis)
Structural flutter analysis
Pneumatic Elasticity Design Sensitivity and Optimization
The analysis of the air flow rate ranges from subsonic to several Mach number of supersonic
7.Fluid-solid coupling analysis and sound field analysis
Flow-solid coupling analysis is mainly used to solve the interaction between fluid (gas) and structure. Mainly used in automotive NVH, train vehicles or aircraft cabin within the noise prediction analysis, and consider the impact of fluid quality in the structure of the fluid, such as ship's modal characteristics analysis. MSC.Nastran has a variety of methods for solving complete flow-solid coupling analysis problems, including:
Flow-solid coupling method: The flow-solid coupling method is widely used in the field of acoustic and noise control, such as engine noise control, car cabin and aircraft cabin within the sound field distribution control and research, NVH and so on. In the analysis process, dynamic response analysis is carried out by direct and modal methods. The fluid assumptions are spinless and compressible, and the basic control equations of the analysis are three-dimensional wave equations, and two special units can be used to describe the flow-solid coupling boundary. In addition, MSC.Nastran new addition (noise) acoustic block unit and absorption unit for the analysis of this problem has brought great convenience. (Noise) The acoustic load is described by the pressure of the node, either as a constant or as a function of frequency or time, or as a function of the acoustic volume, flux, flow rate, or power spectral density. The results of noise effects from different structural parts can be output separately. For the wide frequency range, the larger model of the sound field analysis can be easily combined with MSC.Nastran ACMS method, while the use of domain parallel computing technology, ultra-unit technology, greatly improve the accuracy and efficiency of the calculation.
Water Elastic Fluid Element Method: This method is usually used to solve extensive fluid problems with structural interface, compressibility and gravity effects. The hydroelastic fluid element method can be used for standard modal analysis, transient analysis, complex eigenvalue analysis and frequency response analysis. When the fluid acts on the structure, it is necessary to point out the fluid nodes and the corresponding structural nodes at the coupling interface. The degree of freedom is the displacement and the corner in the structural model, while in the fluid model the Fourier coefficient of the pressure function is adjusted in the axisymmetric coordinate system. Similar to structural analysis, the fluid model produces "stiffness" and "mass" matrices, but with different physical meanings. Load, constraint, node ordering, or degree of freedom condensation can not be used directly on a fluid node.
Virtual mass method, virtual mass method is only considered the impact of fluid quality on the structure, mainly for the following flow - solid coupling problem analysis:
（A）The structure is immersed in an infinite or semi-infinite liquid with a free liquid surface
（B）The container contains an incompressible liquid with a free liquid surface
（C）The combination of the above two cases, such as the ship in the water and the cabin is not filled with liquid
MSC.Nastran sound field analysis function also integrates Actran's acoustic solution technology, not only can be analyzed within the sound field, but also for external sound field analysis. Can analyze the structure of the sound radiation, sound propagation, absorption, scattering and sound and vibration coupling problems.
8.Multi-level supercell analysis
Supercell analysis is a very effective means of solving large problems, especially when engineers intend to make local modifications and re-analysis of existing structural parts. The super-unit analysis is mainly through the analysis of the whole structure into many small sub-components, that is, the structure of the characteristic matrix (stiffness, conductivity, mass, specific heat, damping, etc.) compressed into a group of main degrees of freedom similar to the substructure method , But has a stronger function and is easier to use than it is. Sub-structure can make the problem simple to say, the calculation efficiency is improved, the computer's storage capacity is reduced. The super-unit analysis adds repetition and mirror mapping and multi-layer sub-structure functions on the basis of the substructure. It can be used not only separately but also mixed with the whole model. The nonlinear and linear partial processing in the structure can reduce the nonlinearity The size of the problem. Application of super-unit engineers only need to re-calculate the affected super-unit parts, so that the analysis process more economical and more efficient, to avoid the overall model of the changes and the entire structure of the recalculation. MSC.Nastran excellent multi-level ultra-unit analysis function in the large-scale international cooperation projects have been widely used, such as aircraft engines, nose, body, wing, vertical tail, door, etc. in the final assembly factory can be different Regional and different countries are designed and produced separately, where each project subcontractor can not only use the super-unit function to carry out a variety of structural analysis independently, and through data communication in a certain use of modal synthesis technology through the computer simulation of the entire aircraft Structural characteristics.
Multi-level hypersonal analysis is one of the main strengths of MSC.Nastran and applies to all types of analysis such as linear static analysis, regular modal analysis, geometric and material nonlinear analysis, response spectrum analysis, direct eigenvalue, frequency response , Transient response analysis, modal eigenvalue, frequency response, transient response analysis, modal synthesis analysis (mixed boundary method and free boundary method), design sensitivity analysis, steady state, unsteady state, linearity, nonlinear heat transfer Analysis, acoustic analysis, optimization analysis and so on.
9.Advanced Symmetry Analysis
MSC.Nastran provides different algorithms for different features such as symmetry, antisymmetry, axisymmetry, or cyclic symmetry of the structure. Advanced symmetric analysis can greatly compress the size of large-scale structural analysis problems and improve computational efficiency.
Many structures, including rotating machinery and even radar antennas in space, are often composed of specific structural parts arranged cyclically and cyclically cyclically around a certain axis. For such structures it is often necessary to use cyclic symmetry or rotational symmetry Method for structural analysis. In the analysis only need to select a specific structural parts to obtain the entire component structure of the calculation results, can reduce the calculation and modeling time. Circular symmetry can be divided into two kinds of symmetric types, namely simple cyclic symmetry and cyclic symmetry. In a simple rotational symmetry, the symmetric structure has no plane mirror symmetry plane and the boundary can have a bidirectional curved surface. In the symmetrical symmetry, each symmetric structure has a plane mirror symmetry plane, and the boundary between the symmetrical structures is a plane. Cyclic symmetry analysis usually solves the problems of linear static, modal, buckling and frequency response analysis.
10.Design Sensitivity and Optimization Analysis
Design optimization is to meet the specific design goals such as minimum weight, maximum first order natural frequency or minimum noise level. MSC.Nastran has a strong and efficient design optimization capabilities, the optimization process by the design sensitivity analysis and optimization of two major components, can be static, modal, buckling, transient response, frequency response, aerodynamic elasticity and flutter analysis optimization. Efficient optimization algorithms allow hundreds of design optimization variables and responses in large models.
In addition to its ability to optimize shape and size design for structural optimization and detailed component design processes, MSC.Nastran integrates topology optimization functions for the product conceptual design phase.
Topology optimization is a nonparametric shape optimization method that is different from parametric shape optimization or size optimization. In the product concept design phase, the initial design of the structure topology or geometric contours is provided. Topological optimization Using the Homogenizaion method, the static analysis satisfies the minimum mean flexibility or the maximum average stiffness under the constraint condition of the residual volume (mass) ratio of the structural design region. In the modal analysis, the maximum basic eigenvalue or the specified The minimum difference between modal and computational moduli. The current topology optimization design unit is the first order shell element and the entity unit. The topology optimization is integrated in MSC.Nastran, and a new topology optimization solution is established by special DMAP tool. In MSC.Patran in a dedicated topology optimization interface, full support for topology optimization modeling and post-processing results.
Using MSC.Nastran advanced unit technology and static analysis, the effective method of modal analysis can be very effective in solving large-scale topology optimization model.
MSC.Nastran optimization function can achieve multi-disciplinary optimization, can be the following analysis type and its combination analysis optimization.
Static analysis (SOL101)
Modal analysis (SOL103)
Buckling analysis (SOL105)
Direct Method Complex Eigenvalue Analysis (SOL107)
Direct Method Frequency Response Analysis (SOL108) *
Modal Method Complex Eigenvalue Analysis (SOL110)
Modal Frequency Response Analysis (SOL111) *
Modal Method Transient Response Analysis (SOL112) *
Static air bomb analysis (SOL144)
Flutter analysis (SOL145)
MSC.Nastran optimization features:
Can be optimized for topology, size optimization and shape optimization, as well as combinatorial optimization for better design
Topological optimization can be performed with different quality objectives in the multiple design of the component
Automatic external supercell optimization (AESO) can automatically divide the model into non-optimized design and optimization design (external supercell) components to improve optimization efficiency
Bonding contacts can be defined in optimization
Can be non-linear optimization
Topometry can optimize the thickness (material distribution) of each unit with each unit as a design variable, depending on the target set.
At the same time, stochastic optimization is added, the fluid modality is used as the constraint condition and the manufacturing constraint function, and the manufacturing constraint is applied to ensure that the optimized structure can be manufactured.
11.Analysis of Rotor Dynamic Characteristics
Rotor dynamics is mainly used in electric power, nuclear energy, petrochemical, mechanical, aviation and aerospace and other departments to solve the rotating machinery of the dynamic meter, vibration analysis, fault diagnosis and other issues. Its main task: to analyze the critical speed, rotor unbalance caused by synchronous vibration response, began to instability of the door speed, the rotor is expected to accelerate or slow down the process of transient response.
The rotor dynamics of MSC.Nastran provides the user with a relatively simple method for performing frequency response analysis (direct and modal), modal (direct and modal), static, linear transients With non-linear transients (only direct method) to analyze to meet the design requirements.
Frequency response analysis is used to analyze the rotor-bearing system by any excitation should also be calculated due to rotor imbalance or other speed-related excitation generated by the response.
The complex modal analysis calculates the whirling frequency and the critical speed, which is the modal of the rotor-bearing system at a certain rotational speed of the rotor. Critical speed is the most important indicator of rotor design.
Static analysis is used to analyze the effects of loads due to skew and other factors, to avoid friction between the rotor blades and the casing or other stator parts.
One advantage of the MSC.Nastran rotor dynamics module is that it is based on the MSC.Nastran original mature and stable solution series (SOL 101, SOL 107, SOL 108, SOL 109, SOL 110, SOL 111, SOL 129) This is the other software can not match. MSC.Nastran rotor dynamics analysis, taking into account the gyro effect and squeeze the oil film damper model. Used to analyze the rotor vortex mode, the critical speed, frequency response, transient response and the static characteristics of the rotor. The gyroscopic torque and kinetic characteristics of rotary machinery rotor systems such as aero engines, compressors, centrifuges, turbines, turbines and pumps can be analyzed.
12.Integration with ADAMS for rigid / elastomeric multibody analysis
MSC.Nastran can be seamlessly integrated with MSC.ADAMS, so that MSC.ADAMS can easily on the key components of the system strength and stiffness of the rigid body / flexible body mixture of multi-body kinematics, dynamic analysis. MSC.Nastran The output model of the neutral file MNF can be imported into MSC.ADAMS for rigid / soft coupling analysis, while MSC.Adams linearized system model can also be imported into MSC.Nastran for analysis.
13.Non-linear function (SOL 400 SOL 600 SOL 700)
MSC.Nastran nonlinear module is used to analyze high nonlinear problems, two-dimensional, three-dimensional large slip contact and other issues, its powerful, covering a complete non-linear type of material nonlinear, contact, large displacement / rotation and large strain The The definition of the contact body is very convenient, just define the independent contact body and contact table, you can define the deformation, deformation - rigid body, self-contact and other contact types, contact can be considered a variety of friction models, adhesion and separation The It has abundant unit library and nonlinear material model. The analysis type can be static nonlinearity, nonlinear buckling and modal, dynamic nonlinearity and creep analysis and a variety of nonlinear combinations. It can be used to decompose the parallel technology, greatly accelerating the nonlinear analysis process.
MSC.Nastran's advanced nonlinear module SOL 400, with superior non-linear analysis capabilities. Its features include:
1.Analysis chain function. Can be achieved chain multi-step analysis, the results of the previous step is the initial analysis of the initial conditions. Widely used in a variety of preload, pre-operating conditions analysis. Linked analysis types include linear and nonlinear static analysis, modal analysis, buckling analysis, transient response analysis, direct method complex eigenvalue analysis, modal complex eigenvalue analysis, and body Approach analysis.
2 Perturbation analysis function. Nonlinear static analysis after modal analysis, the typical application is the brakes of the brake brakes.
3.Contact analysis function. Can define a variety of bonding and contact, while bonding can also define the detachment conditions. Such as body bonding, shell bonding, shell bonding, shell side edge bonding and so on. For different types of adhesive, can also define the transmission torque of the bond, such as body shell bonding, body beam bonding, shell beam bonding and so on. Contact definition In addition to point contact and face contact, you can also define the beam contact and shell edge contact. Greatly simplifies the contact analysis modeling.
4.Using the equivalent static load (Equivalent Static Load (ESL)) for non-linear optimization.
5.Integrates steady-state and transient thermal analysis functions to achieve steady-state chain analysis and thermo-structural chain analysis.
6.Grid adaptive function, in the deformation of the larger area, can be achieved surface mesh and the automatic re-division of the grid.
MSC.Nastran's implicit nonlinear analysis module SOL 600, fully integrated with the powerful non-linear software Marc function, can solve a variety of nonlinear static and transient problems. Such as structural analysis, thermal analysis, thermo-structural coupling analysis and other multi-physics coupling problems. SOL 600 can solve the problems covered by various professional fields, such as aerospace, automotive, general machinery, bio-medical, electronic appliances. Can analyze and solve a variety of engineering problems, whether simple or extremely complex, including multi-body contact, multi-mode load, nonlinear materials and geometric nonlinearity. SOL 600 supports a wide range of complex nonlinear material models, including composites, viscoelastic materials and superelastic materials. SOL 600 can be processed, such as sheet metal stamping, body forming and other non-linear problems of virtual simulation, predict the processing results. The grid auto-partitioning feature can efficiently solve complex multi-body contact problems without having to re-check the model, re-divide the grid and re-submit the analysis, saving a lot of time and cost. In addition, the new version of SOL 600 also added the following features:
Heat transfer analysis and automatic modeling of thermal stress analysis
Thermal gradients in the thickness direction can be considered when thermal analysis of the composite material is carried out
Enhanced modeling capabilities include large deformation equations for riveting units, solder joint units and Bush units (CFAST, CWELD, CBUSH)
Calculate the stress intensity factor using the virtual crack closure method (VCCT) or the Lorentz method; calculate the composite layer
Improved some computing performance
MSC.Nastran explicit nonlinear analysis module SOL 700, fully integrated Dytran fluid-solid coupling analysis function and LS-DYNA structural analysis function, can carry out a variety of highly transient nonlinear event simulation analysis. The module uses the explicit integration method and can simulate the nonlinearity of various materials, geometric nonlinearity and collision contact nonlinearity. It is particularly suitable for the analysis of short dynamical processes including large deformation, highly nonlinear and complex dynamic boundary conditions. The software also provides the Lagrangian solver and the Euler solver, which simulates both the structure and the simulation of the fluid. Lagrange grids and Euler grids can be coupled so that the interaction between the fluid and the structure can be analyzed to form a precise and unique fluid-solid coupling technique. The software has a rich material model and provides a variety of defined contact patterns, pieces that can simulate from metal, nonmetallic (including soil, plastic, rubber, etc.) to composites, from linear elasticity, yield, equation of state, Explosion burning and other behavior patterns and simulation of various complex boundary conditions. For the large deformation problem, SOL 700 provides a unique Smooth Particle Hydrodynamics technology to ensure the convergence and accuracy of the calculation. At the same time, SOL 700 also has a chain analysis function, can be explicit - explicit, explicit - implicit, implicit - explicit - implicit chain analysis for multi - step drop analysis, rebound analysis and pre - Stress - rebound analysis.
The SOL 700 module supports more than 160 material models with more than 50 contact types and a complete contact type. Excellent parallel computing capabilities, including distributed parallel algorithms (MPP) and shared memory parallelism (SMP), are widely used in the following areas.
Structural collision analysis, such as car, aircraft, trains, ships and other means of transport collision analysis, the hull stranded, bird body impact aircraft structure, aviation engine containment analysis;
Safety protection analysis, such as safety helmet design, airbag expansion analysis and automotive ~ air bag ~ the combination of the three in the car collision process response, aircraft safety analysis (aircraft crash, with airbag landing, etc.)
Drop test, such as various objects (weapons and ammunition, chemical products, equipment, electrical appliances such as remote control, mobile phones, televisions, etc.)
Metal elastic-plastic large deformation forming, such as sheet metal stamping, full three-dimensional forging forming
Explosion and impact, such as underwater explosion, underground explosion, the impact of the explosion on the structure of the container and damage, explosion forming, explosion separation, explosion vessel design optimization analysis, explosion damage to buildings and other facilities, Focus design analysis, warhead structure design analysis
Underwater / airborne missile launch process, artillery pilot simulation dynamic simulation of high-speed, ultra-high-speed armor, such as missile combat or penetrate the target (single or composite target) and penetration process
Hydrodynamic analysis, such as liquid, gas flow analysis, liquid shaking analysis,
Analysis of Drainage and Dynamic Balance of Tire in Water
Dynamic Analysis of High - speed Train Operation System. The impact of the high-speed train through the tunnel, the action of the air pulse force caused by the high-speed train operation on the sound barrier structure, the dynamic response of the vehicle bridge and other transient high-speed process simulation.
14.MSC.Nastran parallel solution method
MSC.Nastran a variety of parallel solution method:
Support shared memory stand-alone multi-CPU parallel SMP;
Distributed multi - machine multi - CPU parallel DMP;
Based on the geometric region (GD), the frequency region and the degree of freedom or matrix domain parallel method;
Parallel automatic component modal synthesis (PACMS);
MSC.Nastran application example
Strength analysis of boom of Sanyi heavy lifting machine
Strength Analysis of Shanghai Shipbuilding (Group) Co., Ltd
Modal Analysis of a Frame of FAW Group
Thermal Stress Analysis of Engine Exhaust
Optimization Design of Aircraft
SAH Analysis of SAIC Vehicle
