西安电子科技大学学报 ›› 2019, Vol. 46 ›› Issue (6): 88-94.doi: 10.19665/j.issn1001-2400.2019.06.013

• • 上一篇    下一篇

一种三轴振动载荷谱保型裁剪方法

白金1,仇原鹰1(),李静1,王钊倩1,李贵林1,王海东2,王肇喜2   

  1. 1. 西安电子科技大学 机电工程学院, 陕西 西安 710071
    2. 上海航天精密机械研究所, 上海 201600
  • 收稿日期:2019-06-26 出版日期:2019-12-20 发布日期:2019-12-21
  • 通讯作者: 仇原鹰
  • 作者简介:白 金(1995—) 男,西安电子科技大学博士研究生,E-mail:jbai9@stu.xidian.edu.cn
  • 基金资助:
    国家部委基础科研项目(JSZL*******C012)

Tailoring method for triaxial vibration load spectrum preserving pattern

BAI Jin1,QIU Yuanying1(),LI Jing1,WANG Zhaoqian1,LI Guilin1,WANG Haidong2,WANG Zhaoxi2   

  1. 1. School of Electromechanical Engineering,Xidian University,Xi’ an 710071, China
    2. Shanghai Spaceflight Precision Machinery Research Institute,Shanghai 201600, China
  • Received:2019-06-26 Online:2019-12-20 Published:2019-12-21
  • Contact: Yuanying QIU

摘要:

由于多轴向同时振动不能简单地采用单轴依次振动来完全等效,对此提出了一种保持结构关键部位三轴与单轴随机振动应力等效的载荷谱裁剪方法。通过推导线性系统三轴随机振动载荷到结构关键点响应间的变换关系式,提出三轴载荷谱均方根值裁剪方法;综合考虑试件中不同零部件的重要程度和材料强度,基于试件关键部位在三轴载荷下的等效应力与在单轴依次载荷下的最大等效应力之比应等于裁剪前后该点应力响应功率谱均方根值之比,分类定义了三轴载荷谱均方根值裁剪准则,同时为避免因谱型裁剪的多样性造成试验的不确定性,制定了三轴载荷谱的保型裁剪原则。以某典型舱段电路板为例,验证了该三轴载荷谱裁剪方法的有效性。利用该方法得到的三轴载荷谱,不仅可以避免结构重要零部件过试验或欠试验,而且也保证了关键点应力的等效性和裁剪谱型的确定性。

关键词: 随机振动, 关键点, 应力等效, 载荷谱裁剪

Abstract:

Because the multi-axial simultaneous vibration cannot be simply equivalent to single-axis sequential vibration, a load spectrum tailoring method is proposed to maintain the equivalence of the random vibration stress of triaxial vibration and single-axis vibration in the key parts of the structure. A method of root mean square value clipping of triaxial load spectrum is proposed by deducing the transformation relation between triaxial random vibration load and the response of key points of the structure. And based on the presupposition that the ratio of the equivalent stress of the key parts of the specimen under triaxial loads to the maximum equivalent stress under uniaxial loads should be equal to the ratio of the root mean square value of the stress response of the point before tailoring to that after tailoring, then considering the importance of different parts and the strength of materials, triaxial load spectrum root-mean-square value clipping criteria are defined. In order to avoid the uncertainty of the test caused by the diversity of spectral pattern tailoring, the pattern-preserving tailoring rules of the triaxial load spectrum are formulated. Finally, the effectiveness of the triaxial load spectrum tailoring method is verified by taking a typical cabin circuit board as an example. The triaxial load spectrum obtained by this method can not only avoid the over-test or under-test of important parts of the structure, but also ensure the equivalence of stress of key points and the certainty of the cut spectrum type.

Key words: random vibration, key point, stress equivalent, load spectrum tailoring

中图分类号: 

  • O32