ISO 18431-4:2007

Name: ISO 18431-4:2007 — Mechanical vibration and shock — Signal processing — Part 4: Shock-response spectrum analysis
SKU: ISO 18431-4:2007
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Mechanical vibration and shock — Signal processing — Part 4: Shock-response spectrum analysis

Название (английский):

ISO 18431-4:2007

Mechanical vibration and shock — Signal processing — Part 4: Shock-response spectrum analysis

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 16
Дата публикации:: 16 января 2007 г.
Издание:: ISO IS 18431 edition 1 version 1
ICS:: 17.160

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Описание (английский):

ISO 18431-4:2006 specifies methods for the digital calculation of a shock-response spectrum (SRS) given an acceleration input, by means of digital filters. The filter coefficients for different types of shock-response spectra are given together with recommendations for adequate sampling frequency.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18431-4:2007 - "Mechanical vibration and shock - Signal processing - Part 4: Shock-response spectrum analysis" defines standardized digital methods to calculate a shock-response spectrum (SRS) from an acceleration time record. The standard specifies how to model a set of single-degree-of-freedom (SDOF) oscillators, the transfer functions used to obtain maximum responses versus natural frequency, and the digital-filter approach (including the Ramp Invariant Method) to produce accurate SRS results. It also provides filter coefficient formats and recommendations for adequate sampling frequency.

Key topics and technical requirements

SDOF modelling: SRS is built by applying the measured base acceleration to an array of SDOF mass–damper–spring systems and recording the peak response per natural frequency.

Response types: acceleration response (input is acceleration), plus variants such as relative velocity, relative displacement, pseudo‑velocity and equivalent static acceleration.

Spectrum variants: maximax (maximum absolute response), positive, negative, primary (during input) and residual (after input).

Transfer functions & parameters: formulation in terms of natural frequency, Q‑factor (resonance gain) and damping ratio (ζ). Guidance on frequency spacing - e.g., for Q = 10 (≈5% damping) a minimum of six frequencies per octave (~20 per decade) is recommended.

Digital filter design: second‑order digital filters (z‑transform form with numerator/denominator coefficients α, β) are used to approximate the analogue SDOF transfer functions. The standard prescribes algorithms and coefficients and uses the Ramp Invariant Method for filter derivation.

Sampling considerations: the document gives recommendations on sampling frequency and anti‑aliasing precautions required for valid SRS calculations.

Normative references: includes ISO 2041 (vibration and shock vocabulary) and cross‑references other parts of ISO 18431.

Practical applications

Characterizing dynamic mechanical environments (shock and transient loading) with an SRS to quantify peak responses across frequencies.

Defining and deriving test specifications for shock testing and environmental qualification of components and equipment.

Converting measured shock records into SRS-based pass/fail criteria for product design, reliability, packaging, and field damage investigation.

Supporting the development of vibration/shock test procedures (used together with test standards such as IEC 60068‑2‑81).

Who uses this standard

Vibration and shock engineers, test lab personnel, and reliability / environmental test designers.

Mechanical, aerospace, automotive and electronics engineers involved in qualification and ruggedization.

Software developers implementing SRS calculation algorithms in data‑acquisition and signal‑processing tools.

Related standards

ISO 18431 series (Parts 1 and 2 and other parts in preparation)

ISO 2041 - Vibration and shock - Vocabulary

IEC 60068‑2‑81 - Environmental testing: shock test design (example of test design from SRS)

Keywords: ISO 18431-4, shock-response spectrum, SRS, mechanical vibration, digital filters, SDOF, Ramp Invariant Method, sampling frequency, Q-factor, pseudo-velocity.

ISO 18431-4:2007

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Технические детали

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IEC 60068-2-81:2003

Environmental testing - Part 2-81: Tests - Test Ei: Shock - Shock response spectrum synthesis