多点随机振动控制试验中随机相位双谱恢复方法  

Control of multi shakers in random vibration test based by bi-spectrum

作　　者：陆勇星[1,2] 陈怀海[2] 曹立娟[2] 

机构地区：[1]金华职业技术学院,浙江金华321016 [2]南京航空航天大学振动工程研究所,江苏南京210016

出　　处：《振动工程学报》2010年第4期420-424,共5页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(10972104)

摘　　要：为了适应多振动台试验控制要求,提出了一种基于双谱的随机相位恢复新方法。该方法首先通过对自谱添加线性相位,根据双谱数值估计算法获得其空间三维幅频视图与相位信息,随后通过推导建立起自谱与双谱间的幅频与相位联系,幅频关系主要体现在自谱与双谱幅频左右视图在数值上相差一个常数,相位关系主要体现在双谱相位按列展开向量在空间上与自谱相位间存在一一对应映射关系。通过一数值算例,验证了这层关系的存在。A new method on generating driving signal based on bi-spectrum for controlling of multi shakers in random vibration test. The auto-spectrum is supplemented by linear phases, three-dimensional drawing and random phases are obtained from bi-spectrum calculations. The equivalent relationship of amplitudes and phases between auto-spectrum and bi-speetrum are established, the amplitude-frequency diagrams exist in a constant and phases have mapped relationships in space. At last, a simulation experiment was completed to show the effective aspects of the method.

关 键 词：双谱 随机相位 自谱 

分 类 号：O324[理学—一般力学与力学基础] TB535[理学—力学]