ISO 7626-5:2019 振动和冲击 机械灵活性的实验测定 第5部分：使用带附加激振器的单点平移激发测量

标准编号：ISO 7626-5:2019

中文名称：振动和冲击 机械灵活性的实验测定 第5部分：使用带附加激振器的单点平移激发测量

英文名称：Mechanical vibration and shock — Experimental determination of mechanical mobility — Part 5: Measurements using impact excitation with an exciter which is not attached to the structure

发布日期：2019-12

标准范围

This document specifies procedures for measuring mechanical mobility and other frequency-response functions of structures excited by means of an impulsive force generated by an exciter which is not attached to the structure under test.
It is applicable to the measurement of mobility, accelerance or dynamic compliance, either as a driving point measurement or as a transfer measurement, using impact excitation. Other excitation methods, such as step relaxation and transient random, lead to signal-processing requirements similar to those of impact data. However, such methods are outside the scope of this document because they involve the use of an exciter which is attached to the structure.
The signal analysis methods covered are all based on the discrete Fourier transform (DFT), which 
is performed mostly by a fast Fourier transform (FFT) algorithm. This restriction in scope is based 
solely on the wide availability of equipment which implements these methods and on the large base 
of experience in using these methods. It is not intended to exclude the use of other methods currently under development.
Impact excitation is also widely used to obtain uncalibrated frequency-response information. For 
example, a quick impact test which obtains approximate natural frequencies and mode shapes can be quite helpful in planning a random or sinusoidal test for accurate mobility measurements. These uses of impact excitation to obtain qualitative results can be a first stage for mobility measurements.
This document is limited to the use of impact excitation techniques for making accurate mobility 
measurements.

标准预览图