BS-ISO-18738-2003.pdf
BRITISH STANDARD BS ISO 18738:2003 Lifts (elevators) Measurement of lift ride quality ICS 91.140.90 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 18738:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 August 2003 © BSI 8 August 2003 ISBN 0 580 42399 9 National foreword This British Standard reproduces verbatim ISO 18738:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MHE/4, Lifts, hoists and escalators, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to17 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 18738:2003(E) © OSI 3002 INTERNATIONAL STANDARD ISO 18738 First edition 2003-08-01 Lifts (elevators) Measurement of lift ride quality Ascenseurs Mesure de la qualité de déplacement d'un ascenseur BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:83781 O3002(E) DPlcsid Fremia ihTs PDF file mya ctnoian emdebt dedyfepcaes. 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The work of preparing International Standards is normally carried out through ISO 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 18738 was prepared by Technical Committee ISO/TC 178, Lifts, escalators, passenger conveyors. BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:83781 O3002(E) I ©SO 3002 All irhgts seredevr v Introduction The objective of this International Standard is to encourage industry-wide uniformity in the definition, measurement, processing and expression of vibration and noise signals that comprise lift ride quality. The aim of such uniformity is to benefit lift industry clients by reducing variability in the results of lift ride quality measurements caused by differences in the methods of acquiring and quantifying the signals. This International Standard is intended to be referred to by those parties interested in a) developing manufacturing specifications and calibration methods for instrumentation, b) defining the scope of the specifications for lift ride quality in contracts, and c) measuring lift ride quality in accordance with an International Standard. It is intended to produce lift ride quality measurements which a) are simple to understand without specialized knowledge of noise and vibration analysis, b) correlate well with human response to ensure plausibility, and c) are accountable via calibration procedures which are traceable to national standards. This International Standard refers to ISO 8041 and IEC 60651 and has drawn significantly on the considerable body of research implicit in these standards. However, several special challenges drawing on additional research and development were also recognized. Experience in the lift industry indicates that evaluation of vibration in terms of peak-to-peak levels is of particular relevance to passenger comfort. It was considered necessary for this International Standard to provide a dual form of expression, quantifying both the maximum peak-to-peak and A95 peak-to-peak vibration levels. To minimize the adverse effects of external influences unique to the lift industry, it was considered necessary to prescribe the prerequisites and method of the measurement process as well as the relevant boundaries (start and end points) over which each signal is quantified. It was also considered necessary to analyse vertical vibration and vertical motion control separately in order to correlate with human response. Finally, through the inclusion of algorithms amenable to digital programming, this International Standard reflects the commercial need in the lift industry for instrumentation capable of rapid automatic computation of the required signal quantities. Analog systems may be used providing that the requirements of this International Standard are met. BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADR IS:83781 O3002(E) I ©SO 3002 All irhgts seredevr 1 Lifts (elevators) Measurement of lift ride quality 1 Scope This International Standard specifies requirements and methodology for the measurement and reporting of lift ride quality during lift motion. It does not specify acceptable or unacceptable ride quality. NOTE Lift performance parameters are often referenced in conjunction with lift ride quality. Parameters relevant to lift performance include jerk and acceleration. This International Standard defines and uses performance parameters where they are integral to the evaluation of ride quality. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2041:1990, Vibration and shock Vocabulary ISO 2631-1:1997, Mechanical vibration and shock Evaluation of human exposure to whole-body vibration Part 1: General requirements ISO 5805:1997, Mechanical vibration and shock Human exposure Vocabulary ISO 8041:1990 and Amd.1:1999, Human response to vibration Measuring instrumentation IEC 60651:2001, Sound level meters IEC 60804:2000, Integrating-averaging sound level meters GUM:1993, Guide to the expression of uncertainty in measurement. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML1) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2041, ISO 5805, IEC 60804 and the following apply. 3.1 acceleration rate of change of z-axis velocity, attributed to lift motion control NOTE It is expressed in metres per second squared (m/s2). 1) This was corrected and reprinted in 1995. BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:83781 O3002(E) 2 I ©SO 3002 All irhgts seredevr 3.2 vibration variation with time of the magnitude of acceleration, when the magnitude is alternately greater and smaller than a reference level NOTE 1 It is expressed in metres per second squared (m/s2). NOTE 2 The deprecated unit Gal (Galileo) is sometimes used: 1 Gal = 0,01 m/s2 3.3 A95 value of acceleration or vibration, within defined boundaries or limits, which 95 % of found values equal or are less than NOTE 1 This value is used statistically to estimate typical levels. NOTE 2 See 5.2.3, 5.4.1 and 5.4.3. 3.4 velocity rate of change of z-axis displacement, attributed to lift motion control NOTE Velocity is reported as speed and direction of travel. It is given in metres per second (m/s). 3.5 V95 value of velocity, within defined boundaries or limits, which 95 % of found values equal or are less than NOTE 1 This value is used statistically to estimate typical levels. NOTE 2 See 5.5.3. 3.6 axes of measurement orthogonal reference axes for the measurements, where for lifts of conventional configuration, x is the perpendicular to the plane of the car front door (i.e. back to front), y is the perpendicular to x and z (i.e. side to side), z is the perpendicular to the car floor (i.e. vertical) NOTE For lifts of unconventional configuration, the axes should be defined for directions of basicentric coordinate systems for mechanical vibrations influencing human subjects, for a standing person facing the front car door, in accordance with ISO 2631-1. 3.7 lift ride quality sound levels in the car, and vibration of the car floor, relevant to passenger perception, associated with lift motion 3.8 jerk rate of change of z-axis acceleration, attributed to lift motion control NOTE 1 The passenger perception of vertical ride quality during jerk is represented by the assessment of vertical vibration during non-constant acceleration. See 5.3 and 5.4.3. NOTE 2 Jerk is expressed in metres per second cubed (m/s3). BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:83781 O3002(E) I ©SO 3002 All irhgts seredevr 3 3.9 peak-to-peak vibration levels sum of the magnitudes of two peaks of opposite sign separated by a single zero crossing 3.10 sound A-weighted sound pressure level, in decibels 3.11 sound pressure level Lp ten times the logarithm to the base 10 of the ratio of the square of the sound pressure to the square of the reference sound pressure NOTE The reference sound pressure level is 20 µPa (2 × 105 Pa) 3.12 equivalent sound pressure level LAeq average A-weighted sound pressure level, using frequency weighting A and time weighting “fast”, determined within defined boundaries 4 Measuring instrumentation 4.1 General The measuring instrumentation shall consist of the following: a) transducers to measure acceleration in each of the three orthogonal axes; b) a transducer to measure the sound pressure level; c) data acquisition system; d) data storage system; e) data processing system. 4.2 Characteristics The characteristics of the measuring instrumentation shall be as described in Table 1. BS ISO 18738:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:55:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:83781 O3002(E) 4 I ©SO 3002 All irhgts seredevr Table 1 Characteristics of measuring instrumentation Characteristic Vibration Acceleration Sound Frequency weighting Whole body x, y, z (see ISO 8041) N/A A weighting, (see IEC 60651) Band limiting See ISO 8041 10 Hz low-pass filter, (2-Pole Butterworth) N/A Accuracy a Type 1 (see ISO 8041) Type 1 (see ISO 8041) b Type 2 (see IEC 60651) Time weighting N/A N/A Fast (see IEC 60651) Environmental See ISO 8041 See ISO 8041 See IEC 60651 Resolution 0,005 m/s2 0,01 m/s2 1 dB Measurement range 20 % a
