FEAloadsandconstraintsWhatdesignersshouldk0电锤
悍特五金网 2022-09-20 01:35:54
FEA loads and constraints: What designers should k
FEA loads and constraints: What designers should k 2011年12月04日 来源: Loads for most FEA problems are just good guesses. Here's how to stop relying on guessing. Finite-element analysis (FEA) simulates how models react to a range of environments. You define the environments with a combination of loads and constraints which are vitally important to the overall simulation. Although setting up a problem seems straightforward, a few of these factors often complicate the task. For example: It's not always easy to know what the loads and constraints should be, particularly for scenarios involving motion, impact, time-dependent changes, or multiphysics phenomena. Engineers often rely on experience and judgment in determining loads and constraints, and how to apply them. Even experienced engineers have difficulty determining accurate values for these inputs. For example, suppose an impact analysis calls for simulating a structural response when several objects hit. A point load could be used to approximate the impact force. But what you think the load is and what it actually is often differs significantly.
Engineers at Entergy Operations Inc., an operator of nuclear-energy facilities, used MES software to simulate heavy impacts to equipment. In this case, the question was: How does water level affect a tank's structural integrity as it is struck by a heavy object that might be hurled by a tornado?
Artificial loads and constraints complicate result evaluations by introducing "hot spots" —— localized zones of high stress in the model. For example, constrain a point and the area around it may show an artificial stress spike. There's no way around this modaccordingeling effect because it's a peculiarity of FEA mathematics. False spikes complicate results and prompt questions such as: Is the hot spot something to be concerned about, or can it be explained away? The answer also depends on engineering judgment.
MES let biomedical engineers at Wright Medical Technology Inc. evaluate contact stresses for this knee implant. Analysis helped predict wear patterns so designers could improve the implant.
For simple environments, you may be willing to tolerate small inaccuracies from modeling assumptions such as point loads or constraints. But what about more complex situations such as those involving motion, impact, timedependent changes, and combinations? These call for a better solution that comes from software that combines FEA with motion, such as Mechanical Event Simulation (MES) from our company. This solution combines large-scale motion and stress analysis. It uses nonlinear time-dependent FEA to account for changes in the model's inertia, shape, and material behavior as it moves or is struck. There is no need to calculate or approximate loads because the forces and moments are balanced according to Newton's laws of motion.
This multiphysics simulation of a common singlepole residential circuit breaker combines electrostatic, transient heat transfer, and motion to determine performance characteristics such as trip time. The software simulates a voltage overload which heats and deforms a bimetallic strip that trips the mechanism to break the circuit.
For instance, it can be difficult to know the area of possible contact in assemblies, or the contact area may change over time. In such a scenario, it's nearly impossible to determine the loads or constraints that accurately represent the effect of touching parts. But when motion is combined with FEA, designers can simply model actual parts and let the software calculate contact loads. Like basic FEA, MES provides as much flexibility as possible to help users apply known loads and constraints in ways that make sense. For example, it can apply point, surface, edge, and body loads. But you only define what you know. It's no longer necessary to guess when defining FEA inputs. Many engineering scenarios also involve several physical phenomena, such as structural effects, fluid characteristics, thermal behavior, voltage effects, and more. Because of this, MES handles temperature and voltage data as inputs, letting users better simulate the real world. Flexible simulation tools such as MES let users "know" less than ever about loads and constraints while accurately simulating complex, realistic scenarios. Make Contact:Algor Inc., (412) 967-2700, algor.com (end)
- 最好GLD80055s甲带给煤机的优点与使用保定分条刀晋城清灰机线切割机床Trp
- 最好工具钢价格行情走势2019年03月14日插秧机高温线控制晶闸管筛分过滤机轧钢机Trp
- 最好2日太原3042B卷板市场价格行情电机阀滑阀模具陶瓷阀门直刀Trp
- 最好中国第三台万吨挤压机落户青海国鑫铝业公司电动绞盘烘干机锰钢台山振动马达Trp
- 最好美国嫌电动汽车太安静将定新规让其发声传动带管封口机连接阀手机转接头饮料包装机Trp
- 最好3月21日邯邢铁精粉最新价格行情电器插头活塞阀内燃机通风软管智能定硫仪Trp
- 最好葛红林与福建省委副书记省长唐登杰举行会谈T型阀发射模块铰刀气压开关吴忠Trp
- 最好今日铟行情查询0苯胺印刷机风冷发动机精密注塑球形阀橡胶模具Trp
- 最好5日天津市场钢塑复合管价格行情电线杆机械配件农机配件铜阀门轴承磨床Trp
- 最好5月11日唐山炼焦煤最新价格行情冲压模沟槽冷水机示波管宜昌Trp
- 最好9月14日海口市场建筑钢材价格行情电机定子滑动轴承模架陶瓷发热管直插钽电容Trp
- 最好12日河北市场还原铅价格行情餐盒机钢模刻楦机三角阀压花辊Trp