BS 5944-5-1992 Measurement of airborne noise from hydraulic fluid power systems and components.
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34B8866BF48B4ABE8BBB900B8DDEF100 |
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0.6 |
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页数： |
12 |
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日期： |
2024-6-23 |
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BS 5944: Part 5: 1985,UDC 62-822 :534.61+621.65 :534.62,. British Standards Institution. No part of this publication may be photocopied or otherwise reproduced without the prior permission in writing of BSI,British Standard,Measurement of airborne noise from,hydraulic fluid power systems,and components,Part 5. Simplified method of determining sound power levels,from pumps using an anechoic chamber,Mesurage du bruit aerien emis par les transmissions hydrauliques,Partie 5. Methode simplifies de determination des niveaux de puissance acoustique du bruit emis,par les pompes dans une chambre anechoTque,Messung des Luftschalls von Hydraulikanlagen und -bestandteilen,Teil 5. Vereinfachtes Verfahren zur Bestimmung der Schallpegel von Pumpen im schalltotem Raum,British Standards Institution,BS 5944 : Part 5 : 1985,Foreword,This Part of BS 5944 has been prepared under the direction,of the Machinery and Components Standards Committee,and is one of a group of British Standards related to the,measurement of noise emanating from hydraulic fluid,power systems and components.,It is intended that this standard will unify testing methods,and enable the performance of different pumps to be,compared on a common basis.,The standard comprises the following Parts.,Part 1 Method of test for pumps,Part 2 Method of test for motors,Part 3 Guide to the application of Part 1 and Part 2,Part 4 Method of determining sound power levels from,valves controlling flow and pressure,Further Parts are planned.,Compliance with a British Standard does not of itself,confer immunity from legal obligations.,BS 5944 : Part 5 : 1985,Contents,2,2,2,2,2,3,3,3,Page,Foreword Inside front cover,Committees responsible Back cover,Method,0 Introduction,1 Scope,2 Definitions,3 Measurement uncertainty,4 Test environment,5 Instrumentation,6 Installation conditions for pump,7 Operating conditions,8 Location and number of sound measuring,points,9 Test procedure 4,10 Calculation of pump mean sound pressure levels,and sound power levels 4,11 Calculation of mean sound pressure level at a,reference distance 4,12 information to be recorded 4,13 Test report 5,Appendices,A Errors and classes of measurement 6,B Reference dimensions, axes and location of,sound measuring points 6,C Corrections for pump sound power level 8,D Calculation of mean sound pressure level at a,reference distance 8,Tables,1 Standard deviation of sound power level,determination 3,2 Allowable variations in test conditions 4,3 Permissible systematic errors of measuring,instruments as determined during calibration 6,4 Coordinates of microphone locations 6,Figure,1 Key reference axes and dimensions 7,BS 5944 : Part 5 : 1985,Method,O Introduction,In hydraulic fluid power systems, power is transmitted and,controlled through a liquid under pressure in a closed,circuit. Pumps are components which convert rotary,mechanical power into fluid power. During the process of,converting mechanical power into hydraulic fluid power,airborne noise, fluid-borne vibrations and structure-borne,vibrations are radiated from the pump.,The airborne noise level of a hydraulic fluid power pump,is an important consideration in component selection.,The noise measurement technique should, therefore,be such as to yield accurate appraisals of these airborne,noise levels. The determination of noise levels is complicated,by the interactions which occur during noise measurement.,The fluid-borne and structure-borne vibrations from the,pump can be transmitted to the circuit and ultimately give,rise to background airborne noise levels which could affect,the determination of the pump airborne noise levels.,The procedures described in this Part of BS 5944 are,intended to measure only the airborne noise radiated,directly from the pump under test.,This standard closely follows the methods described in,BS 5944 : Part 1 and Part 2 but allows the use of alternative,pump mounting and drive configurations which are simpler,and cheaper to implement in an anechoic chamber. Much of,the guidance given in BS 5944 : Part 3 is equally applicable,to this standard. The data obtained has been shown to be,sufficiently accurate In industrial terms for frequency A,weighted, octave and 1/3 octave noise measurements.,1 Scope,This Part of BS 5944 describes procedures for the,determination of the sound power levels of a hydraulic fluid,power pump, under controlled conditions of installation,and operation, suitable for providing a basis for comparing,the noise levels of pumps in terms of:,(a) A-weighted sound power level;,(b) octave band sound power levels.,From these sound power levels, sound pressure levels may,be calculated for re……
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