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Advances in numerical computation based mechanical system design and simulation
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作者 Hirpa G.Lemu 《Advances in Manufacturing》 SCIE CAS CSCD 2015年第2期130-138,共9页
This paper highlights the available numerical computation techniques in mechanical engineering field with focus on application of modeling and simulation within renewable energy conversion machines as a particular res... This paper highlights the available numerical computation techniques in mechanical engineering field with focus on application of modeling and simulation within renewable energy conversion machines as a particular research case. The study makes special focus on simulation approaches based on finite elements and multibody dynamics that are currently focused within the research community. Developing the simulation model in a computer-aided design (CAD) tool is a precondition for a successful simulation-based mechanical system research. The article discusses and elaborates the methods imple- mented to integrate design data with other computer-aided engineering functions. The motivation is the fact that simulation-based research is useful for design optimization of mechanical systems that operate in harsh and unfriendly environment where conducting physical testing of proto- types is difficult. In addition, the manufacturing environ- ment is benefiting from the developments in numerical computation techniques through machining simulation that significantly reduce the time-to-market and thus increase competitiveness. The study is also intended to explore the existing gaps of capabilities in current approaches in application of computational techniques in order to draw at- tention to future challenges and trends. 展开更多
关键词 numerical computation - finite elementanalysis (fea Multibody simulation Wind turbine Wave energy converter
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高转速袋型阻尼密封泄漏的特性 被引量:12
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作者 李志刚 李军 丰镇平 《航空动力学报》 EI CAS CSCD 北大核心 2012年第12期2828-2835,共8页
采用有限元分析和计算流体动力学耦合数值分析方法(FEA/CFD),研究了考虑转子系统由于高速旋转造成转子径向伸长效应时袋型阻尼密封的泄漏特性和流场形态.计算了密封间隙为0.13mm时,袋型阻尼密封试验件在3种压比、3种转速下的泄漏量,并... 采用有限元分析和计算流体动力学耦合数值分析方法(FEA/CFD),研究了考虑转子系统由于高速旋转造成转子径向伸长效应时袋型阻尼密封的泄漏特性和流场形态.计算了密封间隙为0.13mm时,袋型阻尼密封试验件在3种压比、3种转速下的泄漏量,并与试验值和不考虑转子伸长效应的CFD数值模拟结果进行了比较,验证了所采用的FEA/CFD数值方法的可靠性(误差小于1.3%)和高转速下考虑转子伸长的必要性.研究了6种压比、6种转速下密封间隙为0.25mm的袋型阻尼密封的流场和泄漏量,分析了压比和转速对袋型阻尼密封泄漏特性的影响规律.结果表明:当压比大于0.26时,随压比的减小,袋型阻尼密封泄漏量逐渐增大;当压比减小到一定值时(π<0.26),泄漏流体的马赫数在最后一个密封齿间隙处达到1.0,即发生了堵塞,此时泄漏量达到与密封进口总压相对应的最大值;在高转速下,考虑和不考虑转子半径的伸长,密封泄漏量均随转速的增大而减小;在转子面周向马赫数大于0.35时,需要考虑转子半径伸长对泄漏量的影响. 展开更多
关键词 袋型阻尼密封 fea CFD(finite ELEMENT analysis computationAL FLUID dynamics) 高转速 转子伸长 泄漏特性 数值模拟
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