Personal tools
Home 7th International LS-DYNA Conference

restrict search to current section
For a simple text search, enter your search term here. Multiple words may be found by combining them with AND and OR. The text in this field will be matched with items' contents, title and description.

 

7th International LS-DYNA Conference

3D Numerical Simulations of Penetration of Oil-Well Perforator into Concrete Targets
Qiankun Jin, Zheng Shigui, Gary Ding, Yianjun, Cui Binggui - Beijing Engineering Software Technology Co., Ltd.
The oil-well perforator and its interaction with concrete targets are simulated with fluid-structure coupling algorithm and the new mesh motion option of the multi-material ALE formulation of LS-DYNA[1] in Version 960. Comparison of the simulation results to the experimental test data has been conducted. The simulation results show good correlation with data in tests and indicate that LS-DYNA can be used as an engineering tool to help in the ...
A MATERIAL MODEL FOR TRANSVERSELY ANISOTROPIC CRUSHABLE FOAMS IN LS-DYNA
Andreas Hirth - DaimlerChrysler
Paul Du Bois, Dr. Klaus Weimar - DYNAmore
Recently new materials were introduced to enhance different aspects of automotive safety while minimizing the weight added to the vehicle. Such foams are no longer isotropic but typically show a preferred strong direction due to their manufacturing process. Different stress/ strain curves are obtained from material testing in different directions. A new material model was added to the LS-DYNA code in order to allow a correct numerical ...
A MOOSE CRASH DUMMY FOR LS-DYNA
Larsgunnar Nilsson, Anders Jernberg - Engineering Research Nordic AB
The vehicle to moose impact constitutes a serious traffic problem in the Nordic Countries. Thus, in addition to the conventional requirements on crashworthiness, a Swedish car is also supposed to protect the occupants in the case of a moose impact. The Swedish National Road and Transport Research Institute (VTI) has developed a moose crash test dummy, which has shown to have a similar impact behaviour on the vehicle as a real moose. The main ...
A Virtual Golf Robot for Golf Equipment Simulation
Tom Mase - Michigan State University
The equations of motion for a two-lever pendulum are developed using Lagrange's equation. An assumed kinematic golf swing is used to generate generalized forces to drive the golf robot. These moments are used to generate a golf robot swing using LS-DYNA. The LS-DYNA model is flexible enough so that the model can be used as a virtual laboratory.
Aircraft Engine Blade-Out Dynamics
Kelly S. Carney, Charles Lawrence, Dorothy V. Carney - NASA Glenn Research Center
A primary problem in the design of aircraft gas turbine engine internal and support structures is the accurate simulation of the fan blade-out event and the subsequent windmilling of the engine. Reliable simulations of the blade-out event are required to ensure structural integrity during flight as well as to guarantee successful blade-out certification testing. A model and procedure has been developed which successfully predicts the key ...
ALE and Fluid-Structure Interaction Capabilities in LS-DYNA
M’hamed Souli - Universite des Sciences et Technologie de Lille
Lars Olovsson, Ian Do - Livermore Software Technology Corporation
A new Eulerian-Lagrangian coupling algorithm and improved multi-material ALE-capabilities have made LS-DYNA an efficient tool for analyzing large deformation processes, such as bird strike events, forging operations and penetration problems. This paper contains four example problems that illustrate the current features of the code.
An Application of LS-DYNA for the New FMVSS 208 Front Impact Tests
Charlotte Jamte, Tim Keer, Richard Maloney, Joshua Weage - Arup
The automotive safety community is currently facing the challenge of new front impact legislation (FMVSS 208), to be introduced in the USA in 2004. Vehicles will be subjected to an increased number of and type of barrier tests. This paper describes a new technique, using LS-DYNA, to aid the vehicle development process. A virtual “sled” has been developed for analysis of the different FMVSS 208 impact scenarios. This sled model would ...
AN LS-DYNA USER DEFINED MATERIAL MODEL FOR LOOSELY WOVEN FABRIC WITH NON-ORTHOGONAL VARYING WEFT AND WARP ANGLE
Marlin Brueggert, Romil R. Tanov - Center for Advanced Product Evaluation, Division of IMMI
The behavior of loosely woven fabrics (LWF) differs significantly from other types of woven fabric materials, the major difference being the significant change that the angle between the weft and warp fibers undergoes as the fabric stretching forces change. These unique characteristics have made the LWF a very important part for the functionality of some recently developed occupant protection safety devices for the automotive and heavy ...
An Optimization Procedure For Springback Compensation Using LS-OPT
Nielen Stander, Mike Burger, Xinhai Zhu, Bradley Maker - Livermore Software Technology Corporation
The purpose of this study is to develop a methodology for springback compensation in sheet metal stamping operations. An optimization method is employed to minimize the difference between the simulation results and the intended design. This procedure results in an optimized die shape. LS-DYNA, LS-OPT and TrueGrid are used to input original tool geometry, material, and process parameters, identify design variables, perform springback ...
AN UPDATED TOOLBOX FOR VALIDATION AND UNCERTAINTY QUANTIFICATION OF NONLINEAR FINITE ELEMENT MODELS
Keng C. Yap, G. Wije Wathugala, Timothy K. Hasselman - ACTA Inc.
It is becoming commonplace to use numerical simulations supported by limited experimentation for the characterization of physical phenomena. This trend, with its perceived potential for reducing costs, is the basis for the simulation-based procurement initiatives currently gaining momentum within the government and industry. Insuring the quantitative viability of a simulation-based procurement still requires some experimental data upon which ...
Analyzing Elastomer Automotive Body Seals Using LS-DYNA
Linhuo Shi - TG North America Corporation
Several different elastomer automotive body seals (weatherstrips or weather seals) are analyzed using explicit solver of LS-DYNA. The results are compared with those obtained from non-linear finite element analysis (FEA) solvers widely used for elastomer analysis as well as the experimental results. It is found that properly modeled LS-DYNA can be a very good tool for elastomer body seal analysis, especially for the analysis with potential ...
APPLICATION OF LS-DYNA IN NUMERICAL ANALYSIS OF VEHICLE TRAJECTORIES
Jerry W. Wekezer - FAMU-FSU College of Engineering
Krzysztof Cichocki - Technical University of Koszalin
Errant vehicles may pose a serious threat to neighboring traffic of pedestrians, bicyclists, and even to their drivers in a densely populated urban environment. Accident reconstructions have indicated that street curbs do not offer any meaningful protection against errant vehicles, which can easily traverse street curbs even at small velocity and shallow angles. The paper presents research results of a study, in which computational mechanics ...
Applications of LS-DYNA in Electronics Products
Hanks Hsu, Brian Hsiao - Flotrend Corporation
Portable electronic devices have become smaller and lighter but they are also easily damaged during accidentally drop situation. Therefore, new electronic products are usually needed to pass requirements of shock and drop test before actually delivering to customers. FEM simulation provides engineers a useful and powerful approach to identify the potential weakness of products before the prototype is even made. The report will introduce ...
APPLICATIONS OF LS-DYNA TO STRUCTURAL PROBLEMS RELATED TO RECOVERY SYSTEMS AND OTHER FABRIC STRUCTURES
Benjamin A. Tutt, Anthony P. Taylor - Irvin Aerospace Inc.
Irvin Aerospace Inc., has used the LS-DYNA Explicit Finite Element Analysis (FEA) tool for over five years for the analysis of static and dynamic fabric problems. The References provide many examples of this previous work. Our first application was the analysis of airbag landings for several spacecraft programs, including Reusable Launch Vehicles (RLV’s), various Unmanned Air Vehicles (UAV’s), Military Airdrop Systems, and planetary ...
Automotive Door Sealing System Analysis
Rosa Zhao, Frank Lee, Thomas Oetjens - General Motors Corp.
Door sealing system is one of the most important automotive quality issues. Problems with door seal system could cause water leakage, wind noise and hard to open or close, which impair customer’s satisfaction of the vehicle. That is why the door seal problem is always among the Hardy Perennial Top 10 list in JD Power Tracking Study. The design rationality and manufacturing process are important aspects for the functionality and performance ...
BALLISTIC IMPACT MODELING OF COMPOSITE MATERIALS
Chian-Fong Yen - Materials Sciences Corporation
A computational constitutive model has been developed to characterize the progressive failure be- haviors of composite laminates under high velocity ballistic impact conditions. The composite failure model has been implemented within LS-DYNA as a regular material subroutine. The inte- grated code was successfully utilized to predict the damage and ballistic behavior of composite laminates subjected to various ballistic impact conditions. The ...
Characterization of Water Impact Splashdown Event of Space Shuttle Solid Rocket Booster Using LS-DYNA
Matthew E. Melis - NASA Glenn Research Center
Khanh Bui - Livermore Software Technology Corporation
The ALE capability in LS DYNA is used to predict splashdown loads on a proposed replace- ment/upgrade of the hydrazine tanks on the thrust vector control system housed within the aft skirt of a Space Shuttle Solid Rocket Booster. Two preliminary studies are preformed in working towards conducting a full comprehensive analysis: An analysis of the proposed tank impacting water without supporting structure, and an analysis of actual space ...
COMPUTATIONAL MICRO-MECHANICAL MODEL OF FLEXIBLE WOVEN FABRIC FOR FINITE ELEMENT IMPACT SIMULATION
Ala Tabiei, Ivelin Ivanov - University of Cincinnati
This work presents a computational material model of flexible woven fabric for finite element impact analysis and simulation. The model is implemented in the nonlinear dynamic explicit finite element code LSDYNA. The material model derivation utilizes the micro-mechanical approach and the homogenization technique usually used in composite material models. The model accounts for reorientation of the yarns and the fabric architecture. The ...
Continuous Surface Cap Model for Geomaterial Modeling: A New LS-DYNA Material Type
Leonard E Schwer - Schwer Engineering & Consulting Services
Yvonne D Murray - APTEK, Inc.
The Continuous Surface Cap Model is a new addition to the LS-DYNA geomaterial modeling library of constitutive models (Material Type 145). This new model should replace the use of the Geological Cap Model (Material Type 25) for most applications. The Continuous Surface Cap Model maintains all the functionality of the Geological Cap Model with the addition of the third stress invariant, strain rate effects, and damage modeling. The ...
Correlation of the Federal Motor Vehicle Safety Standard 225 (FMVSS225) Requirement of an Automotive Seat System Using LS-DYNA
Frank Xu, Partha Chowdhury, Babushankar Sambamoorthy, Tuhin Halder - Lear Corporation
The National Highway Traffic Safety Administration (NHTSA) has issued a final rule for a new safety standard related to child seats and their anchorage systems in vehicles. FMVSS 225 – Child Restraint Anchorage Systems (CRAS) requires that motor vehicle manufacturers provide a new method for installing child restraints that are standardized and independent of the vehicle seat belt. The requirements for CRAS can ensure their proper ...
CRASHWORTHINESS: NUMERICAL SIMULATION OF VEHILCE-STEEL POLE CRASH
Magdy Samaan - University of Windsor
Ahmed Elmarakbi - University of Toronto
Khaled Sennah - Ryerson University
The objective of this paper is to generate research information to enhance energy absorption characteristics in transportation infrastructures involved in vehicle crash accidents. A finite-element computer model, using the available LS-DYNA software, was developed to simulate crashes of a vehicle and a traffic light steel pole in frontal impact. The finite-element vehicle model was based on a 1991, 4-door, Ford Taurus. The steel pole was ...
Developing FE-Tire Model Library for Durability and Crash Simulations
Masaki Shiraishi, Naoaki Iwasaki - Sumitomo Rubber Industries, LTD
Tomoharu Saruwatari, Kimihiro Hayashi - The Japan Research Institute,Ltd.
 
DEVELOPMENT OF A COUPLED FINITE ELEMENT AND MESH-FREE METHOD IN LS-DYNA
Cheng-Tang Wu - Livermore Software Technology Corporation
Mark E. Botkin, Hui-Ping Wang - GM R & D Center
 
DEVELOPMENT OF A FINITE ELEMENT MODEL OF THE HUMAN BODY
Fuminori Oshita - The Japan Research Institute Ltd.
Kiyoshi Omori, Yuko Nakahira, Kazuo Miki - Toyota Central R&D Labs, Inc.
A finite element human model, THUMS (Total HUman Model for Safety), was developed in order to study human body responses to impact loads. This paper briefly describes the structure of the human model, as well as some of the results of the simulations conducted to validate the model.
DEVELOPMENT OF THE DYNA3D SIMULATION CODE WITH AUTOMATED FRACTURE PROCEDURE FOR BRICK ELEMENTS
Ala Tabiei, Jin Wu - University of Cincinnati
Numerical simulation of cracked structures is an important aspect in structural safety assessment. In recent years, there has been an increasing rate of development of numerical codes for modeling fracture procedure. The subject of this investigation is implementing automated fracture models in the DYNA3D nonlinear explicit finite element code to simulate pseudo 3-D crack growth procedure. The implemented models have the capabilities of ...
DEVELOPMENTS IN THE APPLICATION OF LS-DYNA TO FLUID STRUCTURE INTERACTION (FSI) PROBLEMS IN RECOVERY SYSTEM DESIGN AND ANALYSIS
Anthony P. Taylor - Irvin Aerospace Inc.
Irvin Aerospace Inc. has used the LS-DYNA Explicit Finite Element Analysis (FEA) tool for over five years for that analysis of static and dynamic fabric problems. The references provide many examples of this previous work. Our first application was the analysis of airbag landings for several spacecraft programs, including Reusable Launch Vehicles (RLV’s), various Unmanned Air Vehicles (UAV’s), Military Airdrop Systems, and planetary ...
DROP ANALYSIS OF THE SKID LANDING GEAR OF THE LIGHT HELICOPTER
Alexander V. Konyukhov, Sergey A. Mikhaylov - Kazan State University, Russia
The analysis of helicopter during landing includes both complicated experimental tests and numerical calculation. Up to now very simple models in helicopter engineering have been used in Russia. Contemporary investigation of these problems involves using modern engineering software. The mechanical models included in these software allow to describe highly nonlinear dynamic behavior of engineering structure. This article contains ...
Dynamic Pulsebuckling Analysis of FRP Composite Laminated Beams Using LS-DYNA
Zheng Zhang, Farid Taheri - Dalhousie University
Buckling and post-buckling of composite structures have been important research topics since composite materials became widely used in engineering. As a result, significant volume of research has been done on their static stability, while relatively less has been devoted on characterizing their dynamic buckling and post-buckling response. The literature became particularly scares when considering the dynamic pulsebuckling and post buckling of ...
Economically Improving Crash Worthiness of a Large Propane Tanker
Phillip H. Burnside - PPG Industries
Ed Hampton - Engineering Applied Sciences Inc.
Approximately every three years a 65,000 lb propane tractor-trailer crashes resulting in explosion that usually kills several people. The study presented in this paper first simulates the effects observed at one of these accident sites. This was simulated in LS-DYNA by building a full length model of the tanker trailer and also including the liquid in the tanker. The presence of the liquid in the model provide the initial effects of liquid ...
Energy-Absorbing Wheel Tethers for Racecars
Brian A. Coon - M.S.C.E., E.I.T.
John D. Reid - University of Nebraska-Lincoln
Wheel tethers are frequently used on racecars to prevent detached wheels from flying freely away from the car and injuring spectators. Extremely stiff tethers may cause the wheel assembly to be either yanked back toward the car, putting the driver in danger or to be snapped free at an uncontrolled trajectory, exposing spectators, other drivers, and workers to danger. Conceptual design of energy absorbing wheel tether systems was performed ...
ENHANCED FAILURE PREDICTION IN SHEET METAL FORMING SIMULATIONS THROUGH COUPLING OF LS-DYNA AND ALGORITHM CRACH
Gernot Oberhofer, Harry Dell, Dmitri Dell, Helmut Gese - MATFEM
In sheet-metal-forming the forming limit curve (FLC) is used for ductile sheets to predict fracture in deep drawing. However the use of the FLC is limited to linear strain paths. The initial FLC cannot be used in a complex nonlinear strain history of a deep drawing process or a successive stamp and crash process including a significant change in strain rate. The CRACH software has been developed to predict the forming limit of sheets for ...
eta/VPG: A Virtual Crash and Safety Environment for FMVSS and ECE Standards
Akbar Farahani, Arthur Tang, Tim Palmer, Zubair Uddin - Engineering Technology Associates, Inc.
Vehicle manufacturers, in an effort to reduce costs and meet the demand of customers are constantly reducing product development time. At the same time we see more regulations from governments, primarily aimed at vehicle safety. In additions there are variations in global regulations, such as ECE and FMVSS regulations. In order to meet the objective of reducing time and costs, manufacturers are forced to rely more and more on the virtual ...
Evaluation of the Dropping of a Propeller Shaft During Installation on the USS COLE a DDG 51 Class Destroyer
Phillip Burnside - United States Naval Reserve
A terrorist bomb damaged the USS COLE by putting a hole in the side of the ship that was over 30 feet in diameter and flooded the forward engine room. After the ship was stabilized it was placed on the heavy lift ship, the BLUE MARLIN. The BLUE MARLIN brought the USS COLE back to Ingalls shipyard in Pascagoula, Mississippi for repair as seen in figure 1. The Navy wanted to expedite the repairs to the USS COLE and so parts from the battle ...
EXPERIMENTAL AND NUMERICAL COMPRESSIVE TESTING OF ALUMINUM FOAM FILLED MILD STEEL TUBULAR HAT SECTIONS
William Altenhof, Rita Turchi - University of Windsor
Anne-Marie Harte - Cymat Corp
This research deals with the experimental and numerical testing of aluminum foam filled mild steel tubular hat sections under axial compression conditions. The presence of aluminum foam within the tubular hat section provides a means of stabilizing the buckling process of the tube under axial compression. This method of applying internal support allows for a greater number of folds to be observed in the axial crushing of the hat sections ...
FINITE ELEMENT ANALYSIS OF SLIDING CONTACT BETWEEN A CIRCULAR ASPERITY AND AN ELASTIC URFACE IN PLANE STRAIN CONDITION
S. Subutay Akarca, Dr. William J. Altenhof, Dr. Ahmet T. Alpas - University of Windsor
Wear is a critical phenomenon affecting service life of products. Therefore, wear prediction is an important concern of study. In this study, sliding contact was modeled using LS-DYNA. FEMB was used to create the geometry of the model and the input file was manually modified as necessary. Studies were done to test, calibrate, and validate the model in LS-DYNA before simulation of the sliding wear by an asperity sliding over a plastically ...
Finite Element Modeling of Cable Hook Bolts
John D. Reid - Brian A. Coon - University of Nebraska-Lincoln
Component analysis of any complex system is frequently required to determine the true accuracy of a finite element model. Although a composite system may yield the “correct” final results, the system is not truly accurate unless individual components are performing correctly. The purpose of this paper is to describe the component testing and finite element modeling of a standard 5/16”-18 x 2” galvanized shoulder hook bolt used in cable ...
Finite Element Simulations and Testing of Washington State Precast Concrete Barrier
Akram Abu-Odeh, D. Lance Bullard - Texas Transportation Institute
Richard B. Albin - Washington State Department of Transportation
Since the early 1970’s, the Washington State Department of Transportation (WSDOT) has used precast concrete barrier (as shown in Figure 1) for both temporary and permanent installations. The use of this barrier in high impact areas has increased through the years and is one of the primary barriers currently used on Washington State highways due to its inherit ease of installation and repair.
High Performance Computing with Microsoft Windows: Meeting the Computational Requirements of Engineering Applications
David A. Lifka - Cornell University
The Cornell Theory Center (CTC) ran proprietary UNIX-based systems from IBM, SGI and others for over ten years as a national supercomputing center. Today, CTC is operating the world's largest Windows® scale-out systems with improved reliability, manageability, and total cost of ownership. This presentation focuses on the experience, benefits, and issues and key components for success CTC had moving from proprietary big-iron to ...
Honeycomb Modeling for Side Impact Moving Deformable Barrier (MDB)
Moisey B. Shkolnikov
Usually honeycomb is used as an energy absorber under impact loads. LS-DYNA constitutive model MAT-26 (*MAT_HONEYCOMB) is to mathematically model honeycomb as an energy absorber. The NHTSA MDB is a physical model of a typical impacting vehicle in side impact tests. The frontal part of MDB is made of honeycomb not just as an energy absorber but as a physical model of a typical car front end. Therefore, here the use of MAT-26 has some ...
IMPROVEMENTS TO THE BEVERAGE CAN REDRAW PROCESS USING LSDYNA
Robert E. Dick - Alcoa Technical Center
In the United States, in the year 2000, over 100 billion aluminum beverage cans were manufactured. Lightweighting of these aluminum D&I beverage cans has been a continuous process for more than 35 years. Aluminum beverage can "ends" have been made progressively smaller over the years in order to reduce costs. Likewise, cost control efforts have resulted in continuous reduction of the net metal requirements for the can body. To reduce the ...
Improving Crash Analysis Through the Estimation of Residual Strains Brought About by Forming Metal
William Broene - Brown Corporation of America
This paper describes a method that can be used to estimate the residual strains from the forming of sheet metal without running forming simulations. For a first-order crash analysis, using estimated residual strains rather than the strains reported from several forming simulations increases the speed of the design process. The method estimates residual forming strains from the part geometry itself and assumes that the part was formed from a ...
Incorporation of Material Model into LS-DYNA Implicit to Model the Shear Behavior of Uncured Woven-Fabric Composite Materials
Jennifer L. Gorczyca, James A. Sherwood, Darin S. Lussier, Julie Chen - University of Massachusetts Lowell
A shear-frame FE model for use in the LS-DYNA implicit code was created to predict the forming behavior of an uncured woven-fabric composite material. This FE model contains fully integrated shell elements and beam elements. A material model developed by McBride and Chen for plain-weave woven composite materials and later refined by Bulusu and Chen to account for different fabric weaves was incorporated into LS-DYNA implicit to model the ...
Interpretation of Deformation Pattern in Automotive Rails in Frontal Impact
Joseph Hassan, K. Ding, G. Nusholtz - DaimlerChrysler Corp. USA
Two barriers are commonly used to evaluate the response of a vehicle in a frontal impact: the rigid barrier and the offset deformable barrier. They produce different deformation patterns, which opens up the possibility that at least one of them does not represent real world crashes. One possible cause of the difference is that an impact into a rigid barrier generates significantly greater stress waves than impacts in the real world resulting ...
Materially & Geometrically Nonlinear Woven Composite Micro-mechanical Model with Failure for Finite Element Simulations
Ala Tabiei, Ivelin Ivanov - University of Cincinnati
A computational micro-mechanical material model of woven fabric composite material is developed to simulate failure. The material model is based on repeated unit cell approach. The fiber reorientation is accounted for in the effective stiffness calculation. Material non-linearity due to the shear stresses in the impregnated yarns and the matrix material is included in the model. Micro- mechanical failure criteria determine the stiffness ...
MODAL METHODS FOR TRANSIENT DYNAMIC ANALYSIS IN LS-DYNA
Bradley N. Maker, David J. Benson - Livermore Software Technology Corporation
Modal analysis methods offer an opportunity for tremendous cost savings compared to traditional explicit approaches to transient dynamic analysis. Modal methods approximate the structural response of a body by a linear combination of pre-computed mode shapes, eliminating the need for explicit element processing. LS-DYNA’s new modal analysis capability is combined with existing rigid body features to offer the additional advantage of ...
MODELING SUSPENSION DAMPER MODULES USING LS-DYNA
Jason J. Tao - Delphi Automotive Systems
A suspension damper module is an integration of the vehicle chassis components that control suspension motion. Various analytical tools are currently used in vehicle suspension analyses and component designs. However, these tools are not particularly useful for analysis of proposed damper module designs since they typically do not accurately represent component interactions and force distributions within the module. This paper describes a ...
Modular Strategy To Build Full Vehicle Finite Element Mode
Subrato Dhar, William E. Hohnstadt, Jeffrey D. Green - General Motor Corporation
The modular approach developed is a unique methodology for building a full vehicle finite element model which allows the use of a single vehicle model, assembled using component modules, to simulate multiple test configurations. This concept allows multiple users to efficiently contribute to construction of a model that can be used to run any number of test configurations. The benefits of a modular approach to full-vehicle finite ...
Multi-body Dynamic Simulation of Acti-Valve
Cunjiang Cheng, GEO Widera - Marquette University
Michael Fassett - Acti-Valve Inc.
A computer simulation of a valve (Acti-Valve) is generated using LS-DYNA. Fluid-structure interaction is considered in the finite element analysis (FEA). The stress, displacement and pressure distributions are analyzed during the opening movement of the valve under 1000 psi line pressure.
MULTIDISCIPLINARY DESIGN OPTIMIZATION OF AUTOMOTIVE CRASHWORTHINESS AND NVH USING LS-OPT
K.J. Craig - University of Pretoria
Nielen Stander - Livermore Software Technology Corporation
D.A. Dooge - DaimlerChrysler Corporation
S. Varadappa - Quantum Consultants, Inc.
This paper describes the multidisciplinary design optimization of a full vehicle to minimize mass while complying with crashworthiness and Noise, Vibration and Harshness (NVH) constraints. A full frontal impact is used for the crashworthiness simulation in the nonlinear dynamics code, LS-DYNA. The NVH constraints are evaluated from an implicit modal analysis of a body-in- white vehicle model using LS-DYNA. Seven design variables describe the ...
New LS-DYNA Fluids Solvers
Grant O. Cook, Zeng-Chan Zhang - Livermore Software Technology Corporation
This paper discusses two new fluid solvers that will be included with releases of LS-DYNA after LS960. The first one is a new compressible solver based upon the Space-Time Conservation Element and Solution Element Method (or the CE/SE method for short), and the second one is an incompressible fluid FEM solver.