SAE-MA-2002A-1988-R2007.pdf
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1、AEROSPACE STANDARD MA2002 REV. A Issued1981-10 Revised1988-07 Reaffirmed2007-08 Impulse Testing of Hydraulic Hose, Tubing and Fitting Assemblies Equivalent to ISO/TC 20/SC 10 DIS 6772 1.SCOPE: This standard establishes the requirements and the procedures for impulse testing of hose assemblies, tubin
2、g, and fittings for use in aerospace metric hydraulic systems. 2.REQUIREMENTS: 2.1Shape of Impulse Trace: When observed on an oscilloscope, the impulse traces show as approximate pressure-time cycles. It is mandatory that these pressure-time curves be confined to the shaded area indicated in Fig. 1,
3、 and that the dynamic impulse trace produced by the test machine shall be in conformance with the trace illustrated in Fig. 1. 2.2Calculations: The rate of rise will be calculated as follows: Where: p= peak pressure in kPa t = time in seconds Rate of pressure rise = 0.9 p - 0.1 p t at 0.9 p - t at 0
4、.1 p - - RATIONALE This document has been reaffirmed to comply with the SAE 5-Year Review policy. SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its appli
5、cability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and
6、suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO P
7、LACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale,
8、 12/04/2007 19:00:04 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE MA2002 Revision A - 2 - 2.2 (Continued): NOTES: (1) The peak pressure is defined as the maximum pressure reached during the test pressure surge to 125 or 150% of the specified operating pressure, as ap
9、propriate. (2) Sweep rate on the oscilloscope shall be adjusted so that the slope of the pressure rise shall take advantage of the full size of the screen. The trace or photograph of the impulse cycle shall be an accurate record of the impulse cycle and shall show a grid or other means to permit acc
10、urate checking. 2.3Preparation of Specimens: The preparation of test specimens shall be defined in the applicable specification of the component. Specimens shall be subjected to the applicable treatments and production test requirements of the component specification. FIGURE 1 - Impulse Trace Copyri
11、ght SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:00:04 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE MA2002 Revision A - 3 - 2.4Test Fluid: The test fluid shall be the specified aircraft s
12、ystem fluid or other hydraulic fluid which is compatible with the item being tested. 3.METHOD OF TEST: 3.1Hose Assemblies: For testing of hose assemblies, the cycle rate shall be 70 5 cpm, and the rate of pressure rise shall be per Table I, unless otherwise specified. The sequence of testing for hos
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