摘要
目的明确细长体试件最合适的两点激励试验形式。方法针对某细长体试件的不同试验形式设计了不同的试验夹具,随后针对试件和夹具开展有限元模态分析,并进行两种形式的两点激励振动试验,研究细长体试件在两点激励振动试验中采用不同试验形式时的动力学响应差异。结果模态分析和试验结果表明,试件和夹具组合体在柔性悬挂方式下依然正确反应了试件本身的模态特性,而在夹具固定方式下模态特性却发生了明显改变。结论细长体试件的两点激励振动试验更适合采用柔性悬挂方式进行。
Objective To clarify the favorite type of the two-exciter vibration test for a slender specimen. Methods Different test fixtures were designed for different testing types of a selected slender specimen. Finite element method was used to analyze the modal characteristics of the specimen and the fixtures. Two types of two-exciter vibration test were carried out to verify the analysis and the different dynamic responses of the slender specimen in different two-exciter vibration tests were studied. Results Modal analysis and test results showed that the combination of specimen and fixture in the mode of flexible suspension correctly reflected the specimen＇ s intrinsic modal characteristics, while the modal characteristics were notably changed in the mode of fixture fixation. Conclusion The flexible suspension method was more suitable for the slender specimen in two-exciter vibration test.
出处
《装备环境工程》
CAS
2015年第2期6-9,58,共5页
Equipment Environmental Engineering
基金
国防科工局技术基础科研项目(H112012A002)~~
关键词
两点激励振动试验
夹具固定
柔性悬挂
细长体试件
模态特性
two-exciter vibration test
fixture fixation
flexible suspension
slender specimen
modal characteris-tics
