基于频率约束的高速柴油机油底壳优化设计

Based on Frequency Constraint Optimization Design of High-speed Diesel Engine Oil Sump

本文首先利用模态分析方法对某高速柴油发动机的油底壳结构进行模态分析,在得出其前10阶固有频率和相应振型的基础上,结合拓扑优化理论,建立基于频率约束的油底壳拓扑优化模型,提出一种更为合理的材料布局方案,得出满足设计要求和使用功能的油底壳最优模型。结合优化过程中对频率的约束,提高其前10阶固有频率,从而避开激振源的频率范围以避免共振的发生。在实现减振降噪目的的同时,又可以减轻油底壳的重量。

This paper makes a modal analysis to a high-speed diesel engine oil sump structure based on modal analysis method at first, in the first ten natural frequencies and corresponding vibration mode, on the basis of combining the theory of topology optimization, based on frequency constraint topology optimization model of oil sump, put forward a more reasonable material layout scheme, concluded the optimal model that meet the design requirements and function. Combining optimization with frequency constraint in the process ,to improve the first ten natural frequencies, so as to avoid the vibration source frequency range in order to avoid the occurrence of resonance. In the purpose of the anti-vibration noise reduction at the same time, also can reduce the weight of the oil sump