1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 18738-2:2012Measurement of ride qualityPart 2: Escalators and moving walksBS ISO 18738-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementati
2、on of ISO 18738-2:2012. The UK participation in its preparation was entrusted to T e c h n i c a l Committee MHE/4, Lifts, hoists and escalators.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the nece
3、ssary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 66036 8 ICS 91.140.90 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standa
4、rd was published under the authority of the Standards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 18738-2:2012 ISO 2012Measurement of ride quality Part 2: Escalators and moving walksMesure de la qualit de dplacement Partie 2
5、: Escaliers mcaniques et trottoirs roulantsINTERNATIONAL STANDARDISO18738-2First edition2012-10-15Reference numberISO 18738-2:2012(E)BS ISO 18738-2:2012ISO 18738-2:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of t
6、his 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 either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-121
7、1 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 18738-2:2012ISO 18738-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Measuring i
8、nstrumentation 34.1 General . 34.2 Characteristics . 34.3 Processing of vibration data 44.4 Environmental effects . 44.5 Sound measurement requirements 44.6 Calibration requirements . 45 Measuring and reporting . 55.1 General measuring conditions . 55.2 General procedure . 55.3 Vibration measurement
9、 55.4 Sound measurement 95.5 Reporting of results . 11Annex A (informative) Ride quality corrected sound pressure estimation 14Bibliography .16BS ISO 18738-2:2012ISO 18738-2:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
10、 (ISO member bodies). 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,
11、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/I
12、EC 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 memb
13、er 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 18738-2 was prepared by Technical Committee ISO/TC 178, Lifts, escalators
14、 and moving walks.ISO 18738 consists of the following parts, under the general title Measurement of ride quality: Part 1: Lifts (elevators) Part 2: Escalators and moving walksiv ISO 2012 All rights reservedBS ISO 18738-2:2012ISO 18738-2:2012(E)IntroductionThe objective of this part of ISO 18738 is t
15、o encourage industry-wide uniformity in the definition, measurement, processing and expression of vibration and noise signals that comprise ride quality of escalators and moving walks.The aim of such uniformity is to benefit industry clients by reducing variability in the results of ride quality mea
16、surements caused by differences in the methods of acquiring and quantifying the signals.This part of ISO 18738 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 specificatio
17、ns for ride quality in contracts; andc) measuring ride quality of escalators and moving walks in accordance with an international standard.This part of ISO 18738 is intended to produce ride quality measurement methods and results which:a) are simple to understand without specialized knowledge of noi
18、se and vibration analysis;b) correlate well with human response to ensure plausibility; andc) are accountable via calibration procedures, which are traceable to national standards.Experience in the escalator and moving walk industry has shown that passenger perception and sound pressure levels measu
19、red while travelling on an escalator or moving walk can be influenced by the presence of extraneous noise sources and by the acoustic characteristics of the environment in which the unit is installed. Additionally, the proximity of the escalator or moving walk to strong reflecting surfaces such as w
20、alls, ceilings or diagonally opposite units can also influence the sound pressure level measured. These influences can cause a sound pressure level measurement to significantly overestimate the sound level emitted exclusively by the unit.In order to address this issue, this part of ISO 18738 defines
21、 the methodology for measuring sound pressure level that corresponds to passenger perception and additionally defines the methods that should be used if further understanding of the result is required in order to quantify the noise emitted by the unit as compared to the background or environmental c
22、ontributions. ISO 2012 All rights reserved vBS ISO 18738-2:2012BS ISO 18738-2:2012Measurement of ride quality Part 2: Escalators and moving walks1 ScopeThis part of ISO 18738 specifies requirements and methodology for the measurement and reporting of escalator and moving walk ride quality. This part
23、 of ISO 18738 does not specify acceptable or unacceptable ride quality values.2 Normative referencesThe 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 refer
24、enced document (including any amendments) applies.ISO 2041, Vibration and shock VocabularyISO 8041, Human response to vibration Measuring instrumentationISO 11201, Acoustics Noise emitted by machinery and equipment Determination of emission sound pressure levels at a work station and at other specif
25、ied positions in an essentially free field over a reflecting plane with negligible environmentalISO 11205, Acoustics Noise emitted by machinery and equipment Engineering method for the determination of emission sound pressure levels in situ at the work station and at other specified positions using
26、sound intensityIEC 61043, Electroacoustics Instruments for the measurement of sound intensity Measurements with pairs of pressure sensing microphonesIEC 61672-1, Sound level metersIEC 61672-2, Calibration sound level meters3 Terms and definitionsFor the purposes of this document, the terms and defin
27、itions given in ISO 2041, ISO 11201, ISO 11205 and the following apply.3.1load carrying unitpart of an escalator or moving walk designed to carry persons for the purpose of transportationEXAMPLE Step, pallet or belt.3.2ride qualitysound pressure levels at defined locations, and vibration of load car
28、rying unit and handrail relevant to passenger perception, associated with escalator or moving walk operationINTERNATIONAL STANDARD ISO 18738-2:2012(E) ISO 2012 All rights reserved 1BS ISO 18738-2:2012ISO 18738-2:2012(E)3.3accelerationrate of change of velocityNOTE 1 The direction is according to Fig
29、ures 1 to 4.NOTE 2 It is expressed in metres per second squared (m/s2) or Galileo (Gal). 1 Gal = 0,01 m/s21 m/s2= 100 Gal.3.4vibrationvariation with time of the magnitude of accelerationNOTE It is expressed in metres per second squared (m/s2) or Galileo (Gal). 1 Gal = 0,01 m/s21 m/s2= 100 Gal.3.5vel
30、ocityrate of change of displacementNOTE 1 The direction is according to Figures 1 to 4.NOTE 2 Velocity is reported as speed in direction of travel. It is given in metres per second (m/s).3.6sound pressure levelLpten times the logarithm to the base 10 of the ratio of the square of the sound pressure
31、to the square of the reference sound pressureNOTE The reference sound pressure level is 20 Pa (2x105Pa).3.7equivalent sound pressure levelLpAeqaverage A-weighted sound pressure level3.8emission sound pressure levelLpAA-weighted sound pressure level at the specified positions, excluding the effects o
32、f background noise and contribution due to the room characteristics (reverberation) of the in-situ environmentNOTE It is expressed in decibels.3.9background noise correctionK1Acorrection term to account for the influence of background noise on the emission sound pressure level at the specified posit
33、ions of the machine under testNOTE The correction in the case of A-weighting is to be determined from A-weighted measured values.3.10environmental indicatorK2Acorrection term to account for the influence of reflected sound on the emission sound pressure level due to the characteristic of the test ro
34、om3.11measured speedspeed of the escalator or moving walk with no load measured at the time of testing after the starting sequence has been completed2 ISO 2012 All rights reservedBS ISO 18738-2:2012ISO 18738-2:2012(E)3.12nominal speedspeed of the escalator or moving walk under no load stated by the
35、manufacturer for which the escalator or moving walk has been designed4 Measuring instrumentation4.1 GeneralThe measuring instrumentation shall consist of:a) a transducer to measure acceleration in each of the three orthogonal axes combined with a data acquisition system;b) a transducer to measure so
36、und pressure level and/or sound intensity level.4.2 CharacteristicsThe characteristics of the vibration measuring instrumentation shall be as described in Table 1.Table 1 Characteristics of vibration measuring instrumentationCharacteristic Vibration load carrying unit Vibration handrailFrequency wei
37、ghtingWhole body combined (see ISO 8041) Hand-arm (see ISO 8041)Band limiting See ISO 8041 See ISO 8041AccuracyaType 1 (see ISO 8041) Type 1 (see ISO 8041)Time weighting 1 sec rms (see ISO 8041) 1 sec rms (see ISO 8041)Environmental See ISO 8041 See ISO 8041Resolution 0,005 m/s20,005 m/s2Measurement
38、 range 20 % above max. instantaneous acceleration to 20 % below min. instanta-neous accelerationb20 % above max. instantaneous acceleration to 20 % below min. instantaneous accelerationbaThe signals shall be filtered to exclude aliasing.bA range of 1,5 m/s2to + 1,5 m/s2should meet the above requirem
39、ent.The characteristics of the sound measuring instrumentation shall be as described in Table 2. ISO 2012 All rights reserved 3BS ISO 18738-2:2012ISO 18738-2:2012(E)Table 2 Characteristics of sound measuring instrumentationMeasurementRide quality Sound pressureEmission Sound pressure levelEmission s
40、ound pressureCharacteristic ISO 11201 ISO 11205MethodSound pressure Sound pressure Sound intensity (see ISO 11205)Frequency weightingA-weighting (see IEC 61672)A-weighting (see IEC 60651)A-weighting (see IEC 61043)Frequency range Not required Not required Octave 63 8 000 Hz Third 50 6 300 HzAccuracy
41、aClass 2 (see IEC 61672) Class 1 (see IEC 1672) Type 1 (see IEC 61043)Measurement time interval15 s, fast 15 s, fast 15 sEnvironmental See IEC 61672 See IEC 61672 See IEC 61043Resolution 0,7 dB 0,7 dB 0,7 dBMeasurement range 35 to 90 dB A-weighted 30 to 90 dB A-weighted See IEC 61043aThe signals sha
42、ll be filtered to exclude aliasing.4.3 Processing of vibration dataVibration data shall be weighted in accordance with ISO 8041 to simulate the human bodys response to vibration.The acceleration signals in the x-, y- and z-axes, measured on the running load carrying unit, shall be frequency weighted
43、 using whole body combined filter and band limiting as defined in ISO 8041. The weighted signals, expressed as rms levels with a time constant of 1 sec, shall be evaluated as a vector sum.The acceleration signals in the xh-axes, measured on the running handrail, shall be frequency weighted using han
44、d-arm filter and band limiting as defined in ISO 8041 and expressed as rms levels with a time constant of 1 sec.The sample rate of the digital measuring system shall be sufficient to enable the measuring range in accordance with ISO 8041.4.4 Environmental effectsThe instrumentation shall comply with
45、 the criteria for mechanical vibration, temperature range and humidity range, specified in ISO 8041.4.5 Sound measurement requirementsThe sound measuring system shall comply with the following. For ride quality sound pressure: the requirements of IEC 61672, Class 2, sound level meters. For emission
46、sound pressure: the requirements of IEC 61672, Class 1, sound level meters or with the requirements of IEC 61043, Type 1, sound intensity meter.The output shall be expressed in A-weighted decibels with respect to a reference sound pressure level (SPL) of 20 Pa.4.6 Calibration requirementsAll instrum
47、entation calibrations shall be traceable to a national standard.4 ISO 2012 All rights reservedBS ISO 18738-2:2012ISO 18738-2:2012(E)4.6.1 Vibration measuring systemThe vibration measuring system shall be calibrated in accordance with ISO 8041.4.6.2 Sound measuring systemCalibration of the sound meas
48、uring system shall be carried out in accordance with IEC 61672, Class 2 sound level meters, for ride quality sound pressure measurements.Calibration of the sound measuring system shall be carried out in accordance with IEC 61672, Class 1 sound level meters or IEC 61043, Type 1, sound intensity meter
49、, for emission pressure.5 Measuring and reporting5.1 General measuring conditionsThe escalator or moving walk should be measured in both running directions except where the unit is designed to operate in one direction only. In this case it is sufficient to measure the unit only in this direction.The measurement shall be carried out under the following conditions.The unit shall be assembled completely, adjusted and operating in accordance with the operating manual; have reached normal operating temperature; b
