【摘要】 柴油机机体振动速度最小化是改善结构本身及相连部件振动噪声特性的关键问题。通过柴油机机体虚拟仿真计算获得振动响应随结构参数的变化率,并探讨目标函数和约束条件对设计变量的灵敏度问题,以确定影响机体振动速度与结构质量的关键设计变量。同时,通过评价机体结构形状及尺寸因素对振动速度与结构质量的影响规律,有效协调两者的权重关系。研究结果表明,改进设计使其振动速度降低了23.87%,结构质量减轻了12kg,从而验证了机体振动速度最小化研究的合理性与有效性。更多还原

【Abstract】 Engine block vibration velocity minimization is a key issue to improve noise and vibration characteristics of the structure itself and the connected component. Achieves the rate of change of vibration response with the block structural parameters through the virtual simulation analysis,and explore into the sensitivity problem for objective function and constraints influence on the design variables,in order to ensure the key design variables of vibration velocity and quality. Meanwhile,the weight relationships between structural quality and vibration velocity were coordinated effectively through the influence of block structure shape and size. The results showed that the vibration velocity was reduced by 23. 87%,and the structural quality reduced 12 kg in the improved process,and also verified the rationality and effective in the research of minimizing the vibration velocity of the block.更多还原