BS 6897-5-1995 机械机动性实验测定.第5部分:使用激发器(与结构不连接)的冲击激励作用进行测量

标准号：BS 6897-5-1995
中文标准名称：机械机动性实验测定.第5部分:使用激发器(与结构不连接)的冲击激励作用进行测量
英文标准名称：Experimental determination of mechanical mobility - Measurement using impact excitation with an exciter which is not attached to the structure
标准类型：J04
发布日期：1995/3/15 12:00:00
实施日期：1995/3/15 12:00:00
中国标准分类号：J04
国际标准分类号：17.160
适用范围：This part of ISO 7626 specifies procedures for meas-uring mechanical mobility and other frequency-response functions of structures excited by means of a translational 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 part of ISO 7626 because they involve the use of an exciter which is attached to the struc-ture. The signal analysis methods covered are all based on the discrete Fourier transform. 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 uncali-brated 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 mo-bility measurements. However, these uses of impact excitation to obtain qualitative results should not be confused with its use for mobility measurements. This part of ISO 7626 is limited to the use of impact excitation techniques for making accurate mobility measurements.