ISO 7626-2-2015 pdf free.Mechanical vibration and shock – Experimental determination of mechanical mobility一 Part 2: Measurements using single-point transl ation excitation with an attached vibration exciter.
This part of ISO 7626 specifies procedures for measuring linear mechanical mobility and other frequency- response functions of structures, such as buildings, machines and vehicles, using a single-point translational vibration exciter attached to the structure under test for the duration of the measurement.
It is applicable to measurements of mobility, accelerance, or dynamic compliance, either as a driving- point measurement or as a transfer measurement. It also applies to the determination of the arithmetic reciprocals of those ratios, such as free effective mass. Although excitation is applied at a single point, there is no limit on the number of points at which simultaneous measurements of the motion response may be made. Multiple-response measurements are required, for example, for modal analyses.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2041, Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 7626-1, Mechanical vibration and shock — Experimental determination of mechanical mobility — Part 1: Basic terms and definitions, and transducer specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7626-1 and ISO 2041 and the following apply.
Note As this part oi ISO 7626 deals with mechanical mobility, the notes to the definitions below provide more detail than is given in ISO 2041.
3.1 frequency-response function
frequency dependent ratio of complex motion response to complex excitation force for a linear system
Note 1 to entry: Excitation may be harmonic, random or transient functions of time. The frequency-response function does not depend on the type of excitation function if the tesLed structure can be considered a linear system in a certain range of the excitation or response. In such a case, the test results obtained with one type of excitation may be used for estimating the response of the system to any other type of excitation. Phasors and their equivalents for random and transient excitation are discussed in Annex B.
Note 2 to entry: Linearity of the system is a condition which, in practice, is met only approximately, depending on the type of system and on the magnitude of the input. Care has to be taken to avoid nonlinear effects, particularly when applying impulse excitation. Structures which are known to be nonlinear (e.g. structures with fluid elements) should not be tested with impulse excitation and great care is required when using random excitation for testing of such structures.ISO 7626-2 pdf free download.
Tags: Mechanical vibration and shock
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