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Integration Analysis A Step Forward in Virtual Development

机译：集成分析虚拟开发中的一步

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Virtual development in the area of structural analysis is often divided in two different parts. First part is static analysis, second part is vibration analysis. For both parts the simulation is done by Finite Element (FE) analysis. In static analysis contact is the most frequently occurring nonlinear effect in mechanical engineering. Any assembly of parts contain one or more contact surfaces, where some parts are connected by bolts, rivets, or any other joint technology. Linear vibration analysis, based on modal methods, is defined for linear models, without contact, only. Methods are needed that derive a linear model from a nonlinear model with contact by taking into account the loaded state of the structure for the contact. Integration analysis merges linear and nonlinear simulation by an automatic method. Connections at closed contacts are frozen. For some applications also the state of friction is taken into account to define damping for vibration analysis. A linear model for vibration analysis is the result of this method. This method will be demonstrated by two state of the art industrial applications: A nonlinear engine model after assembly will be converted in a linear model for a modal based vibration analysis with subsequent frequency response analysis. The influence of taking into account the correct state of the contact will be shown. Optionally, an optimization of rib position at the linearized model can be done. In brake squeal analysis different pressure levels have influence on the contact state and on the frictional forces. It will be demonstrated that the automatic process take into account those effects. The result dependency on several parameters and the advanced solution that solves the equations for a complete sweep over a rotational speed range will be shown. The integration analysis allows the simulation of more detailed physics in the virtual development.
机译：结构分析领域的虚拟开发通常分为两种不同的部分。第一部分是静态分析，第二部分是振动分析。对于两个部件，模拟是通过有限元（FE）分析完成的。在静态分析中，接触是机械工程中最常见的非线性效果。部件的任何组装都包含一个或多个接触表面，其中一些部件通过螺栓，铆钉或任何其他联合技术连接。基于模态方法的线性振动分析定义为线性型号，仅无接触。需要使用与接触的非线性模型从非线性模型导出线性模型的方法，考虑到接触的结构的加载状态。集成分析通过自动方法合并线性和非线性模拟。关闭触点处的连接被冻结。对于某些应用，还考虑了摩擦的状态以定义振动分析的阻尼。用于振动分析的线性模型是该方法的结果。该方法将通过两个现有技术的工业应用证明：组装后的非线性发动机模型将在基于模态振动分析的线性模型中转换，随后的频率响应分析。考虑到触点正确状态的影响将显示。可选地，可以完成线性化模型处的肋位置的优化。在制动尖端分析中，不同的压力水平对接触状态和摩擦力有影响。将证明自动过程考虑到这些效果。结果依赖于若干参数和解决方程在转速范围内解决完全扫描的方程的高级解决方案。集成分析允许模拟虚拟开发中的更详细的物理。

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