查询词典 spot weld

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

Based on the ICMmethod,the discrete topological optimization problem about spot-weld's existence or not is transformed into the continuous optimization problem on[0,1].The optimization model is founded with maximizing the structural stiffness as objective and structural strength as constraints.The problem of multi-objectives and multi-constraints is transformed into the problem of single-objective and single-constraint with the K-S function.The displacement and stress are transformed into the explicit function of design variables with the Response Surface Methodology.The optimization model is solved with Sequential Quadratic Program.

基于ICM（Independent Continuous Mapping，即独立、连续、映射）方法，将焊点有无的离散拓扑优化问题转化为[0，1]区间上的连续优化问题；建立了以结构刚度最大为目标、结构强度为约束的连续拓扑优化模型；采用K-S函数将多目标和多约束问题转化为单目标和单约束问题；运用响应面方法将位移和应力转化为设计变量的显式函数，采用序列二次规划方法求解优化模型。

A resistance spot weld is made by a combination of heat, pressure, and time.

电阻点焊是由结合热，压力和时间。

Can you spot weld a tube to a sheet metal?

你能把一个钢管点焊到钢板上吗？

The characteristics of spot weld interfaces, distributed all over the body, are studied creatively through theory and experiment.

针对车身上分布众多的点焊连接界面的特性描述进行了富有创意的理论与试验研究。

Extension methods in general let you "spot weld" methods on classes without using inheritance.

一般的扩展方法让你"焊接点"的方法，不使用类继承。

Has characteristics of spot weld controlling accurately, fine electrode following character, and is widely used in car fittings and so on mechanical parts, to multiple projection welding and spot welding of .

具有焊点控制精确，电极随动性好的特点，广泛应用在汽配等机械零部件的多点凸焊和点焊上。

We possess more than 40 punches of different tonnages, plate shear, welding machine doing spot weld, projection weld and other production equipment. Meanwhile, equipped with specialized equipment for developing and manufacturing mould, we also adopt advanced CAD disign technology.

公司拥有各种吨位的冲床40余台、剪板机多台，并且还拥有专业焊机与凸焊设备，能进行产品点焊及螺钉、螺帽凸焊焊接，同时在模具开发制造方面有齐全的专用设备相配套，并采用先进的CAD设计技术和专业的模具制造。

We possess more than 50 punches of different tonnages, plate shear, welding machine doing spot weld, projection weld and other production equipment. Meanwhile, equipped with specialized equipment for developing and manufacturing mould, we also adopt advanced CAD disign technology.

上海众浩汽车配件有限公司拥有各种吨位的冲床50余台、剪板机多台，并且还拥有专业焊机与凸焊设备，能进行产品点焊及螺钉、螺帽凸焊焊接，同时在模具开发制造方面有齐全的专用设备相配套，并采用先进的CAD设计技术和专业的模具制造。

DN1-10.16.25series stepping-on transmission spot-welders apply to spot-weld such material as low carbon steel and stainless plate and wire.

适用低碳钢、不锈钢板材、线材的点焊，广泛应用于工艺品、灯品、箱柜等行业。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。