EN 30326-1:1994

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mehanske vibracije - Laboratorijska metoda za ovrednotenje vibracij sedežev vozil - 1. del: Osnovne zahteve (ISO 10326-1:1992)Mechanische Schwingungen - Laborverfahren zur Bewertung der Schwingungen von Fahrzeugsitzen - Grundlegende Anforderungen (ISO 10326-1:1992)Vibrations mécaniques - Méthode en laboratoire pour l'évaluation des vibrations du siege de véhicule - Partie 1: Exigences de base (ISO 10326-1:1992)Mechanical vibration - Laboratory method for evaluating vehicle seat vibration - Part 1: Basic requirements (ISO 10326-1:1992)45.020Železniška tehnika na splošnoRailway engineering in general43.020Cestna vozila na splošnoRoad vehicles in general13.160Vpliv vibracij in udarcev na ljudiVibration and shock with respect to human beingsICS:Ta slovenski standard je istoveten z:EN 30326-1:1994SIST EN 30326-1:2000en01-april-2000SIST EN 30326-1:2000SLOVENSKI
STANDARD
INTERNATIONAL STANDARD 103264 First edition 1992-l l-1 5 Mechanical vibration - Laboratory method for evaluating vehicle seat vibration - Part 1: Basic requirements Vibrations mkaniques - Methode en laborafoire pour I’&aluation des vibrations du si&ge de v&hicule - Partie I: Exigences de base --.------ -.--_. --- -- _- _._. -- --- --.- -.-__ _ ._ - .--- -.- . - . . Reference number IS0 10326-l :1992(E) SIST EN 30326-1:2000

IS0 103264:1992(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 103264 was prepared by Technical Com- mittee ISO/TC 108, Mechanical vibration and shock, Sub-Committee SC 2, Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures. IS0 10326 consists of the following parts, under the general title Mech- anical vibration - Laboratory method for evaluating vehicle seat vi- bra tion: - Part I: Basic requirements - Fart 2: Application to railway vehicles Annex A of this part of IS0 10326 is for information only. 0 IS0 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-121 I Genkve 20 l Switzerland Printed in Switzerland ii SIST EN 30326-1:2000

IS0 103264:1992(E) Introduction Drivers, staff and passengers of vehicles (land, air or water) and mobile off-road machinery are exposed to mechanical vibration which interferes with their comfort, working efficiency and, in some circumstances, safety and health. The following basic requirements have therefore been de- veloped for the laboratory testing of vibration transmission through a vehicle seat to the occupant. SIST EN 30326-1:2000

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INTERNATIONAL STANDARD IS0 10326=1:1992(E) Mechanical vibration - Laboratory method for evaluating vehicle seat vibration - Part 1: Basic requirements 1 Scope This part of IS0 10326 specifies basic requirements for the laboratory testing of vibration transmission through a vehicle seat to the occupant. These methods for measurement and analysis make it possible to compare test results from different lab- oratories. It specifies the test method, the instrumentation re- quirements, the measuring assessment method and the way to report the test result. This part of IS0 10326 applies to specific laboratory seat tests which evaluate vibration transmission to the occupants of any type of seat used in vehicles and mobile off-road machinery. Applica-tion standards for specific vehicles should refer to this part of IS0 10326 when defining the test input vibration that is typical for the vibration characteristics of the type or class of vehicle or machinery in which the seat is to be fitted. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 10326. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 10326 are encouraged to investi- gate the possibility of applying the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid In- ternational Standards. IS0 2631-1:1985, Evaluation of human exposure to whole-body vibration - Part I: General require- ments. IS0 5347-0:1987, Methods for the calibration of vi- bration and shock pick-ups - Part 0: Basic concepts. IS0 8041 :I 990, Human response to vibration - Measuring instrumentation. 3 General The measurement and assessment methods given in this part of IS0 10326 comply with the present practice standardized in IS0 2631-1. The measuring equipment and the frequency weightings shall be in accordance with IS0 8041. The primary test for the vibration characteristics of the seat involves measurements under conditions which simulate the range of actual uses of a vehicle or machine. For some applications, a secondary test is used to ensure that the seat responds acceptably to occasional severe shocks or transient vibration. Given the present state of knowledge, a test to evaluate the damping of the seat suspension is pro- posed for this purpose. The seat to be tested shall be mounted on a horizontal platform of a vibration simulator, which shall have movements in the verti- cal and/or one of the horizontal directions, as specified in application standards. NOTE 1 In order to make tests in both horizontal di- rections, x and Y, the seat may be turned 90” on the plat- form. SIST EN 30326-1:2000

IS0 10326-l :1992(E) 4 Instrumentation Dimensions in millimetres 4.1 Acceleration transducers The measuring systems selected for the evaluation of vibration at the seat mounting base or platform of the vibration simulator and that selected for the evaluation of vibration transmitted to the seat occu- pant, or to an inert mass when used, shall have similar characteristics. The characteristics of the vibration measuring sys- tem, accelerometers, signal conditioning and data acquisition equipment, including recording devices, shall be specified in the relevant application stan- dard, especially the dynamic range, sensitivity, ac- curacy, linearity and overload capacity. 4.2 Transducer mounting One accelerotneter shall be located on the platform (P) at the place of the vibration transmission to the seat. The other accelerometer(s) shall be located at the interface between the human body and the seat, at either the seat pan (S) and/or the backrest (B) (see figure 1). Figure 1 - Location of the accelerometers on the platform (P), on the seat pan (S) and on the backrest w 4.2.1 Transducer mounting on the platform The accelerometer on the platform shall be located within a circle with a diameter of 200 mm centred directly below the seat accelerometer. The measur- ing directions shall be aligned parallel to the move- ment of the platform. 4.2.2 Transducer backrest mounting on the seat pan and/or The accelerometers on the seat pan shall be at- tached in the centre of a mounting disc with a total diameter of 250 mm + 50 mm. The disc shall be as thin as possible (see-figure 2). The height shall not be more than 12 mm. This semi-rigid mounting disc of approximately 80 to 90 durometer units (A-scale) moulded rubber or plastics material shall have a centre cavity in which to place the accelerometers. The accelerometers shall be attached to a thin metal disc with a thickness of 1,5 mm + 0,2 mm and a di- - ameter of 75 mm + 5 mm. The mounting disc shall be placed on the surface of the seat pan and taped to the cushion in such a way that the accelerometers are located midway be- tween the ischial tuberosities of the seat occupant with a tolerance to be defined in the relevant appli- cation standards. Alternative positioning of the disc may be recommended for certain applications. Any variation from the position here defined shall be specified in application standards. When tests are performed without a person sitting on the seat, e.g. during damping tests, the disc shall be placed in the same position as if a person were seated in the seat. If measurements are made on the backrest, the ac- celerometers shall be (horizontally) located in the vertical longitudinal plane through the centre-line of the seat. The relevant application standards shall specify the vertical position of the accelerometers. The measurement axes shall be aligned parallel to the basicentric coordinate system. NOTES 2 Besides the semi-rigid mounting disc recommended for soft or highly countoured cushions, a rigid disc with a generally flat surface or an individual-form design may be used. Such discs may be, for instance, required for testing rail vehicle passenger seats. The transducer mounting should be made of low-mass materids, so that the res- onant frequency of the mounting is at least four titnes the highest frequency specified for the test. 3 For practical reasons, it is usually not possible to align perfectly the accelerotneters in the disc with the axes of motion of the piatfortn. in a tolerance range within 15” of the appropriate axes, the accelerometers may be con- sidered as aligned parallel to the axes of interest. For deviations greater than 15”, acceleration should be measured along two axes and the acceleration vector sum along the axis of interest should be calculated. SIST EN 30326-1:2000

IS0 10326=1:1992(E) Dimensions in millimetres Thin metal disc for accelerometer mount and added centre rlgidlty Appropriate cavity for accelerometer(s) Figure 2 - A semi-rigid mounting disc 4.3 Frequency weighting Frequency weighting shall be in accordance with IS0 8041. 4.4 Calibration The instrumentation shall be calibrated in accord- ance with IS0 5347-O and, depending on the type of measuring system used, to the relevant part of IS0 5347’). It is recommended to check the whole measuring chain following the specifications given in IS0 8041. Calibration shall be made before and after each test series. Where necessary, the output from each acceler- ometer amplifier shall be zeroed after mounting the accelerometers in the test position. 5 Vibration equipment 5.1 Physical characteristics The minimum equipment required is a vibrator ca- pable of driving the platform in the vertical and/or horizontal directions The dynamic response of the exciter shall be capable of exciting the seat with the seated test person and additional equipment, in ac- cordance with the specified test input vibration. Attributes of performance to be specified include frequency range and displacement capability in each of the required directions. Application standards shall specify the lowest ac- ceptable resonance frequency of the platform, the acceptable cross-axis motion of the platform and the frequency range for which this applies. 1) Parts 1 to 20 are to be published. --I Application standards shall specify requirements for test stand dimensions and equipment to ensure that these are adequate for each particular application. NOTE 4 It has been observed that the use of certain equipment (e.g. a steering wheel, pedals, etc.) may lower the repeatability of the results. 5.2 Control system The frequency response characteristics of the vi- bration test system shall be compensated for to en- sure that the power spectral density (PSD) and the pro
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