Company:

AVEVA

Products:

MSC Nastran

Industries:

船舶

一个造船企业可以依靠的解决方案

Overview:
AVEVA是海洋产业工程和设计软件的世界领导者,并且拥有与MSC共同的客户,因此我们两个解决方案之间提供了一个新的接口,无论是对于MSC、AVEVA、还是众多的造船企业及他们的设计单位来讲都是一个好消息。我们采访了AVEVA海洋系统的业务主管Stéphane Neuvéglise,以更加了解新产品的意义及重要性。
 
 
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Company:

Simpleware

Products:

Marc

Industries:

医疗器械

基于生物医学图像植入建模设计

Overview:
关节置换(人工关节)已成为一种较为常见的产品。随着人口老龄化的发展,人的寿命已经超过了天然关节的寿命。虽然现在正在接受治疗的关节也越来越多,如肩,肘,踝关节,但这些经常用到人工关节的地方是髋关节和膝关节。不管关节的位置如何,该过程通常涉及病人病变或受损的关节的移除,取而代之的是将金属、塑料或陶瓷轴承表面连接到一个固定在周围骨上的金属支撑结构。
 
 
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Company:

Products:

Dytran

Industries:

医疗器械

清楚地知道眼睛受伤过程

Overview:
当眼睛受到撞击的时候视网膜的脱落或者撕裂是常见的现象。这个研究的目的是为了了解当人的眼睛受到钝器冲击时的动态变形过程及影响。这个项目的有限元模型是从真实的人眼三维模型测量中得到的。应用了MSC公司的Dytran作为仿真分析工具。对于不同时刻的变形以及弹丸的剩余速度,进行了仿真结果与实际测试结果的比较。
 
 
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Company:

Compumod

Products:

Marc

Industries:

消费品

揭幕巨大金币

Overview:
Compumod很高兴地宣布有限元模拟已被Perth Mint用于铸造打破记录的一吨金币的设计与规划当中。这个纯度为99.99%的一吨金币宽为80cm,厚度超过12cm。铸造之前,Compumod与Perth Mint定下合同来创建浇灌的计算机模拟,以此来实现评估Compumod和夹具的完整性,从而确保硬币的尺寸不会受影响。
 
 
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Company:

BL Advanced Ground Support Systems

Products:

Adams

Industries:

汽车

更快地开发新车型

Overview:
BL Advanced Ground SupportSystems(BL)是专业设计开发战斗机和陆军特种车辆的公司。过去,公司由于依赖外部资源做仿真研究,大量时间浪费在沟通和等待仿真结果上。建立内部的CAE能力,包括使用Adams和Simxpert进行多体系统动力学和多学科仿真分析,成为公司提高设计能力的关键。
 
 
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Company:

NASA喷气推进实验室

Products:

Adams

Industries:

航空

好奇号--唯一成功的机会

Overview:
火星科学实验室是一项机器人空间探测任务,于2012年8月5日实现了火星探测车好奇号在火星上的盖尔火山口(GaleCrater)成功着陆。空中起重机的着陆顺序要求探测车在下降时从收起的飞行形态转为着陆形态,从下降段开始放下车轮。在最后的进入、下降及空中起重机着陆阶段,由于其复杂性以及无法从地球上进行人工干预,因此被NASA的工程师们称作“惊险7分钟”。
 
 
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Company:

通用动力陆地系统公司

Products:

Adams

Industries:

汽车

缩短产品开发周期

Overview:
战斗车辆上的炮塔驱动装置面临一个非常复杂的设计上的挑战。当车辆行驶在崎岖地形时,炮塔驱动装置对车辆进行运动补给,保持以99.5%的精确度瞄准目标。在过去,通用动力陆地系统公司(GDLS)工程师使用单独的仿真技术评估炮塔驱动设计的不同方面,例如刚性体结构、柔性体和控制系统。但这样工程师不能在建立和测试样机之前把炮塔驱动装置作为一个整体系统来评估。
 
 
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Company:

ITW Delfast集团

Products:

Adams

Industries:

机械

工程师从一开始就可以获得正确的设计

Overview:
ITW Delfast集团为汽车行业设计和生产工程用塑料和金属紧固件。典型的塑料紧固件通过插拔式卡扣起到固定作用。由于紧固件存在多个接触体、大变形和滑移接触等多个非线性因素,因此带来了很大的设计难度。过去主要由有经验的分析工程师进行有限元分析,成本昂贵。
 
 
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Company:

Pratt&Miller

Products:

Adams

Industries:

汽车

赛车上的关键问题

Overview:
作为一家非常成功的赛车设计者和制造者,Pratt&Miller学会了如何在紧张的工期中进行赛车研发,并第一时间取得成功。2005年,公司成立了工程服务部门将这些技术推广到其他工业领域。在工期只有几个月的时间里,为国防客户开发出了全面设计的展示车辆,MSC Software公司的ADAMS软件进行的车辆动力学仿真起到了关键作用。
 
 
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Company:

Leading Edge Engineering

Products:

Adams

Industries:

汽车

预测高可信度的疲劳失效

Overview:
许多公司已经使用FEA分析他们的结构,使用一系列静力或者惯性载荷和模态分析来验证他们的产品。这些载荷通常可以有效的工作,成功避免灾难性事件。因而,大部分公司就不再进一步仿真和预测疲劳失效。然而,在开发周期的早期就进行疲劳失效预测,可以节省数次物理原型反复测试过程所造成的时间和金钱的花费。进行疲劳失效仿真可以减少长期保修成本,可以用来优化产品结构。
 
 
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Company:

Fokker Space

Products:

Adams

Industries:

航空

Meeting the Challenge: Engineering for a New Class of Satellite

Overview:

The subject of this case study was an effort undertaken within Fokker Space to lower the volume and mass of solar panel array designs. This culminated in the Curwin solar panel array concept which used a curved arrangement of solar panels (like a tape measure) instead of a separate backbone structure to reduce both volume and mass while retaining the required stiffness and high frequency response.

Challenge:

The goals for the simulation of the deployment were:

  • Determine the important factors in a successful deployment
  • Evaluate the initial design of the solar panel array
  • Validate design changes to meet the requirements of a successful deployment
  • Final validation of a design that resulted in a controlled and reliable deployment
Solution:

MSC Software’s Adams was chosen to analyze the multibody dynamic process during the deployment. In the past, Adams has been successfully used within the spacecraft industry to model solar panel deployment.

Benefits:
  • Lower volume and mass of solar panel array design
  • Reduce costs from $10,000 per pound for a single satellite launched via heavy rockets to below $3,000 with new approach
  • Realistic simulation to replicate on-orbit conditions during deployment

 
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Company:

Big Tyre

Products:

Marc

Industries:

重型装备

Nonlinear Analysis Accelerates Development of Non-Pneumatic, Non-Solid Tire for Mining Industry

Overview:

Designing the right tire for large wheeled vehicles used to haul coal and other materials in underground mines presents an enormous design challenge. Pneumatic tires present risks because of the danger of an explosion in a confined space while solid tires are associated with relatively large vibrations experienced by the driver. Big Tyre, a company that specializes in producing solid tires for mining vehicles, is developing a unique alternative which uses arrays of leaf-springs, typically made of composite materials, to provide performance similar to pneumatic tires without the risk of blow-outs.

Challenge:

Big Tyre is a manufacturer of solid wheels that are primarily used in underground mining vehicles. “Many mining companies have switched from pneumatic tires to solid wheels because of the dangers presented by pneumatic tires underground,” Louden said. “Mines underground have bolts sticking out of the walls that can easily cause punctures. Tires on heavy vehicles are inflated as high as 170 psi, so when they are torn or punctured a considerable amount of force is released. Due to space constraints underground, workers are often in close proximity to the tires so the potential for injury when a tire is torn or ruptures is a major concern.”

Solution:

The design concept provides the flexibility and challenge of defining various design parameters including the number of springs in an array, thickness of springs, curvature of springs, length of springs, material properties of springs, geometry and material properties of the segments that the springs attach to on the outer diameter of the wheel, as well as many others. The design criterion is to provide a very efficient vertical loading for the size of the wheel while providing similar if not equivalent suspension to a pneumatic tire, with excellent torque capacity and lateral stability.

Results Validation:

Compumod first conducted a nonlinear static analysis on one spring to correlate the model material properties with experimental data. The material properties were tuned to replicate the measured reaction force in the experiment. Then a nonlinear analysis was performed on the entire wheel to assess its strength. The wheel was given an enforced displacement of 150 mm which was solved in 100 nonlinear increments. The reaction force was then measured on the ground and graphed against displacement. The first negative slope indicated failure of the wheel at 252 kiloNewtons or 25.7 metric tons, which is well over the target of 16 metric tons. After the first collapse of the wheel, the contact between the springs and between the springs and segments added stiffness to the wheel and the reaction force increased again for increasing displacements.

Benefits:

“After seeing the benefits of the software, we decided to purchase Patran and Marc,” Louden said. “Compumod organized training for us in their Sydney office and handed over the models they created in the consulting project. We very quickly began designing the second full-size version of our design, and have been able to improve the design at a much faster pace than in the past. It even allows us to simulate driving maneuvers of the vehicles, including obstacles on the road.


 
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Company:

Comtes FHT

Products:

Marc

Industries:

机械

Marc Heat Transfer Analysis Helps Solve Tough Forging Problem

Challenge:

Pilsen Steel, a leading producer of castings, ingots and forgings experienced difficulties with ingots cracking in a forging operation. The company contracted with COMTES FHT to investigate and determine the root cause of the formation of longitudinal cracks in 34CrNiMo6 steel ingots.

Solution:

Traditional process involved cooling of the ingots after casting to between 500oC and 600oC, after which the ingots are placed in the forging furnace at temperature of 1100oC to 1200oC. COMTES used MSC Software’s Marc nonlinear finite element analysis (FEA) software to analyze the process of heating the ingots in the furnace and confirmed that heating the ingots in the furnace generated thermal stresses that later caused cracks to form during forging. Additional simulation studies also showed that increasing the temperature of the ingots by 100oC prior to putting them into the furnace reduced thermal stresses to acceptable levels. Pilsen Steel implemented this change and it eliminated the cracking problem.

Benefits:
  • Realistic Simulation of the Multiphysics behavior of metal during manufacturing
  • Elimination of cracking in final product reducing reject rate and improving product quality

Performing thermal analysis on the complete ingot workload requires determining the radiant heat transfer between the furnace and each of the each ingots with shading effects taken into account. Marc excels at this type of challenging multiphysics problem which is why it is our finite element analysis tool of choice

Tikal, COMTES FHT


 
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Company:

Medicrea

Products:

Digimat

Industries:

医疗器械

Designing Spinal Disc Prosthesis Implants using Short Fiber Reinforced Composites

Overview:

Spinal injury and the gradual deterioration of spinal discs that lead to back pain or spinal disorders can be treated surgically. One of the most promising surgical options under continuous development is the use of artificial discs to replace the patient’s natural spinal disc. The materials used in these artificial discs are an important factor in the development of this technology. The discs must be made from materials that are safe to be implanted in the human body, do not cause allergic reactions, but also wear resistant and compatible with medical imaging (MRI for example). Fiber reinforced plastic composites are used more and more in today's orthopedic implants because of their resistance to wear and improved mechanical properties.

Challenge:

The challenge when designing implants that take advantage of reinforced plastics is predicting the manufactured material performance. The mechanical properties of an implant designed with fiber reinforced plastics can vary widely depending on the use of the material and how the implant is manufactured. The injection or compression molding process used to manufacture the implant will affect the fiber orientations throughout the part. Typical analysis assumes the material is isotropic for simplicity, but in reality the fiber alignment is continuously changing throughout the implant, resulting in a heterogeneous, anisotropic material. Poorly aligned fibers or not appropriately accounting for the fibers’ effect on material performance can lead to a softer or stiffer implant than designed, and even premature failure.

Solution:

MSC Software’s Digimat produces a much more accurate prediction of the composite behavior for materials such as fiber reinforced plastics. The process is simple. Start with the same finite element model of the implant that is used for the existing analysis. Digimat will work with any major finite element solver. Next, request the injection mold simulation results from the manufacturer. This analysis is done to assure the implant’s mold has been designed properly for manufacture, but the results can also be used in the finite element analysis of the implant itself. To do this, use Digimat to map the fiber orientations, residual temperatures and residual stresses onto the structural analysis model.

Select or create an intelligent material model of the reinforced plastic using the tools provided by Digimat. The intelligent material model is a function of fiber orientations instead of a static value, allowing Digimat to adjust the material stiffness at every location throughout the implant. Finally, conduct the analysis as normal with one exception, the static value for material stiffness will be replaced by a Digimat material model.

Digimat takes care of tying the intelligent material into the analysis solution so that the analyst can focus on designing the implant’s performance, not guessing at which material property might give the best results.

Results Validation:

The attention to material details result in much more accurate simulations that reduce test/ analysis iterations and improve performance predictions. In the case of the Medicrea design, the original isotropic simulation over-predicted the implant’s stiffness by as much as 170%.

The same simulation using a Digimat material model that accounted for both changes in fiber orientations as well as plastic deformations matched the test results almost perfectly.

Benefits:
  • Cost and time savings
  • Reduce test/analysis iterations
  • Improve performance predictions by 170%

 
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Company:

NASA (JWST-ISIM)

Products:

MSC Nastran
Patran

Industries:

航空

Structural Analysis and Model Validation for the JWST ISIM Structure Using MSC Nastran

Overview:

The James Webb Space Telescope is a highly sensitive instrument that is positioned using a precise optical metering support structure. This supporting structure is made from composites to reduce thermal expansion effects while reducing weight. The instrument and structure are subjected to temperatures ranging from ambient during launch to cryogenic temperatures while in orbit. Dynamic and static loads are encountered during launch and in operation respectively.

Challenge:

The support structure must meet stringent structural requirements related to distortion, dynamic and static loading events. Testing must be supplemented by analysis to verify and improve the limited number of physical tests. Methodologies must be developed to explore the design via a probabilistic approach and satisfy performance within a 2-sigma range of uncertainty.

Solution:

A high fidelity MSC Nastran model (1.5 M nodes, ~5M DOF) was used to examine the structural integrity of the ISIM structure at the global level due to thermal and gravity loads (SOL 101) and a reduced Craig-Bampton model for dynamic analysis (SOL 103). Global only and global-local (detailed stress models) approaches were used along with testing as a basis to develop and validate methodologies and allowables for the design of composite joints.

The high fidelity MSC Nastran dynamic model was validated via subassembly testing and the results were used to determine optimal placement of instrumentation, excitation load point and target modes. The high fidelity MSC Nastran model was also used to predict the thermal distortion that occurs moving from ambient to cryogenic temperatures, cryogenic thermal stability and physical distortion from 1 G loading.

The model was also used to quantify error bounds and uncertainties due to material, manufacturing and spatial variability compared to a nominal analysis. The same model was used to determine and validate strength allowables via a semi empirical approach. These allowables included composite interlamina failure, composites n-plane failure and metallic ultimate and yield failure conditions at both ambient and cryogenic temperatures. In addition, the global-local approach was used to validate adhesive maximum principal stress failure allowables at cryogenic temperatures.

Results Validation:

Direct application of the MSC Nastran solver resulted in a validated design that agreed with dynamic test results with frequencies matching within 5%. Thermal distortion predictions were validated with cryogenic testing and the error bound associated with nominal predictions was established. Allowables validated by MSC Nastran models were shown to be conservative at predicting composite joint failure at ambient and cryogenic temperatures.

Benefits:
  • Accurately predict dynamic, distortion & strength performance of a composite structure at launch & in orbit
  • Close agreement to test results
  • Ability to accurately replicate the extreme environments in space

 
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