摘要
传动箱是柴油机上用于包络传动机构的壳类部件,在评价柴油机整机刚度的模态试验过程中,整机的多个低阶模态振型均显示为传动箱局部模态,进而发现传动箱对柴油机整机刚度的影响较大。基于上述实际问题,在利用试验模态法验证传动箱有限元模型有效的基础上,通过对该柴油机传动箱结构进行模态计算,分析了其动态特性,并进一步以传动箱一阶模态的频率和最大模态变形为响应指标,以传动箱宽度等七种主要结构参数为设计变量进行了灵敏度分析,结果表明传动箱壁厚是影响其刚度的关键因素。然后从传动箱壁厚角度提出了10种传动箱结构改进设计方案,并以模态频率和结构质量变化等指标对比分析得到改进方案4(传动箱壁厚增量为0.5mm)为最优设计方案。研究表明:传动箱壁厚参数是影响传动箱结构刚度的关键因素,而传动箱结构刚度对柴油机整机刚度的影响较大,文中将灵敏度分析、模态试验、数值模拟相结合的方法对于类似壳类零件具有一定的借鉴意义。
The transmission case is a shell component used in the diesel engine for the envelope transmission mechanism. During the modal test to evaluate the stiffness of the diesel engine, the plurality of low-order mode shapes of the whole machine are shown as the local mode of the transmission case, and then it is found that the transmission case has a great influence on the rigidity of the diesel engine. Based on the above practical problems, using the experimental modal method to verify the effectiveness of the finite element model of the transmission case, the modal calculation of the diesel engine transmission case structure is carried out, and its dynamic characteristics are analyzed. Then taking the frequency and maximum modal deformation of the first-order mode of the transmission case as the response indexes, the sensitivity analysis was carried out with seven main structural parameters such as the width of the transmission case. The results show that the thickness of the transmission case is the key factor affecting its stiffness. And then, 10 kinds of transmission case structure improvement design schemes are proposed from the perspective of the thickness of the transmission case, and the improvement design scheme 4(the transmission case thickness increment is 0.5 mm) is the optimal design by comparing the modal frequency and structural quality changes. The research shows that the thickness parameter of the transmission case is the key factor affecting the structural rigidity of the transmission case, and the structural rigidity of the transmission case has a great influence on the rigidity of the diesel engine. The method of combining sensitivity analysis, modal test and numerical simulation has certain reference significance for shell-like parts.
作者
张艳岗
宋智文
马富康
牛军
杨贵春
ZHANG Yangang;SONG Zhiwen;MA Fukang;NIU Jun;YANG Guichun(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China;China North Engine Research Institute,Tianjin 300400,China)
出处
《机械设计与研究》
CSCD
北大核心
2019年第3期204-209,共6页
Machine Design And Research
基金
国家自然科学基金资助项目(51605447)
山西省青年科技研究基金(201601D021085)
山西省高等学校创新人才支持计划资助项目
关键词
柴油机
传动箱
模态分析
灵敏度分析
改进设计
diesel engine
transmission case
modal analysis
sensitivity analysis
improved design
