基于希尔伯特变换的直升机低频振动问题分析方法  

Analyzing Method of Low Frequency Vibration Problems in Helicopters Based on Hilbert Transform

作　　者：王文涛[1] 查建平[1] 许宁[1] WANG Wentao ZHA Jianping XU Ning(China Helicopter Research and Development Institute, Jingdezhen 333001, China)

机构地区：[1]中国直升机设计研究所,江西景德镇333001

出　　处：《航空科学技术》2017年第10期8-12,共5页Aeronautical Science & Technology

摘　　要：直升机在飞行过程中,飞行员经常反映存在"抖动""晃动""筛动"等低频的振动现象,为解决该类问题,需要准确地从测试数据进行问题定位。由于该类现象出现的随机性,采用希尔伯特变换(HT)方法,分析该类低频振动现象及其产生机理,形成直升机低频振动的分析方法,建立低频振动与测试数据之间对应关系,从而相对客观地呈现出机组人员的主观感受。通过对某型机试飞中的低频振动问题的实例分析,验证方法对低频振动问题分析的适用性和有效性,可作为消除低频振动现象的有效分析手段。Phenomenon of low frequency vibrations, like ＂buffet＂, ＂shake＂ or ＂shuffle＂ was often reflected by pilots during early flight testing of a new/remodel helicopter. How to localize the phenomenon in test data accurately was the essential point of analyzing and resolving the problem. In this paper a method based on the Hilbert Transform was provided to form the revolution between the phenomenon and test data, and image the subjective feelings of the pilots objectively, through analyzing the phenomenon and the mechanism. Adopting the method to an example about a low frequency problem of a helicopter indicate that the method is applicable and effective to analyze low frequency vibration problems.

关 键 词：直升机 低频振动 希尔伯特变换 幅值调制 

分 类 号：TV21[水利工程—水文学及水资源]