基于灵敏度的植树挖坑机机架多目标优化设计  

The multiple-object optimum design for the chassis frame of earth auger based on the sensitivity analysis

作　　者：仇君[1] 朱建华[1] 陈家锐[1] 黄伟[1] 

机构地区：[1]广西大学机械工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2014年第2期280-285,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：科学技术部科技人员服务企业行动项目(2009GJE10031)

摘　　要：为了减轻植树挖坑机的重量,提高挖坑机的动态特性,利用有限元软件ANSYS的APDL语言建立新型植树挖坑机机架的参数化模型,以固有频率和质量为目标,以模态灵敏度分析的结果为依据,在机架满足强度条件的前提下,对机架进行多目标优化设计。研究结果表明:该方法可以改善机架的动态特性并实现机架的轻量化,优化后的机架比原机架具有较好的动态特性和较小的质量;植树挖坑机机架的一阶固有频率从原来的32.646 Hz变为30.060 Hz,降低了7.92%,表明机架优化后的一阶固有频率变化较小,机架优化后的固有频率(30.060 Hz)还远远大于发动机振源的频率(20 Hz);总体积从原来的0.004 769 6 m3变为0.003 977 27 m3,减少了16.61%。该研究方法对小型机器机架的设计,特别是小型农用机器机架的设计具有重要参考意义。In order to reduce the weight of the earth auger, and to improve the dynamic properties of the earth auger, a parametric model of the chassis frame of an earth auger was built with the software of ANSYS. With the goal of natural frequency and weight, the chassis frame is optimized by multi-ple-object optimization method based on the result of modal sensitivity analysis and strength condi-tion. The results show that this method can solve coordination between dynamic characteristics and light weight;the optimized chassis frame has better dynamic characteristics and lighter than the orig-inal one;the first order natural frequency of the earth auger chassis frame is reduced by 7.92% from the original value 32.646 Hz to 30.060 Hz. These results show that the change range of the first-or-der natural frequency is small, and the first-order natural frequency of the frame after optimization （30.060 Hz） is still much greater than the vibration frequency（20 Hz）; the total volume has re-duced 16.61% from 0.004 769 6 m3 to 0.003 977 27 m3 . This research method has important ref-erence significance for the chassis frame design of the small machine, especially for the chassis frame design of the small agricultural machine.

关 键 词：机架 灵敏度分析 多目标 优化设计 

分 类 号：TH122[机械工程—机械设计及理论]