SAE ARP 6068-2010 Gas Turbine Engine Test Facility Vibration Measurement《燃气涡轮发动机测试设备振动测量》.pdf
《SAE ARP 6068-2010 Gas Turbine Engine Test Facility Vibration Measurement《燃气涡轮发动机测试设备振动测量》.pdf》由会员分享,可在线阅读,更多相关《SAE ARP 6068-2010 Gas Turbine Engine Test Facility Vibration Measurement《燃气涡轮发动机测试设备振动测量》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、_6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSX EOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDO and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, LVWKHVROHUHVSRQ
2、VLELOLWRIWKHXVHUSAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2017 SAE InternationalAll rights reserved. No part of this publication may be reproduced, sto
3、red 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 PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (outside USA)Fax: 724-776-0790Ema
4、il: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on thisTechnical Report, please visithttp:/standards.sae.org/ARP6068AEROSPACERECOMMENDED PRACTICEARP6068Issued 2010-06Reaffirmed 2017-02Gas Turbine Engine Test Facility Vibration MeasurementRATIONA
5、LEARP6068 has been reaffirmed to comply with the SAE five-year review policy.TABLE OF CONTENTS 1.PURPOSE AND SCOPE 22.APPLICABLE DOCUMENTS AND REFERENCES . 23.VIBRATION MEASUREMENT 33.1General information 33.2Accelerometers . 33.3Velocity Transducers 33.4Mounting Locations and Brackets . 43.5Thrust
6、Stand Effects 43.6Vibration Filters . 43.6.1Broad-Band Vibration Measurement 43.6.2Narrowband Vibration Measurement 53.7Trim Balancing the Engine 53.8Spectrum Analysis 63.9Calibrating Vibration Measurement Systems 63.9.1Manual references 64.MEASUREMENT UNITS. . 65.DATA TYPES 96.EVALUATION AND ANALYS
7、IS 101. PURPOSE AND SCOPE The testprocedure per the applicable Engine Manual does require a vibration check for the low/intermediate and high speed rotorsystems. Release of an engine with high vibrations can result in: x On-wing vibration complaints, with subsequent troubleshooting x Rotorsystem fai
8、lures x Premature engine removals Limits are provided for transient conditions and steady state data points. Troubleshooting recommendations are limited to verification of the proper signal input and tracking. This practice provides recommendations for: x Correct cable and transmitter installation a
9、nd connections x Calibration x Recorded data interpretation and data analysis 2. APPLICABLE DOCUMENTS AND REFERENCES The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of the other publication
10、s shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exempt
11、ion has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AIR5026 Test Cell Instrumentation 2.2 Other References Bently D.E., Fundementals Of r
12、otating Machinery Diagnostics, 2002 Bentley Nevada, Minden Vance, J.M., Rotordynamics of Turbomachinery, 1988 John Wiley, Texas Ehrich, F.F. Handbook of Rotordynamics, 2004 Krieger publishing company, Malabar Florida SAE INTERNATIONAL ARP6068 Page 2 of 11_3. VIBRATION MEASUREMENT 3.1 General informa
13、tion In principle, the vibration of an engine under test can be measured by means of transducers which measure displacement, velocity, or acceleration. In practice, only velocity transducers, which are sometimes called vibration pickups, and accelerometers are used. Engine manufacturers specify vibr
14、ation limits in units of velocity or acceleration. Even with a complex vibration signal containing many frequency components, an acceleration signal can be converted into an equivalent velocity signal by means of a single integration, or into an equivalent displacement signal by means of two integra
15、tions. These integrations reduce the sensitivity of the system to high-frequency vibrations; conversely, they increase its sensitivity to low-frequency vibrations.It is not possible to make such conversions by simple calculator multiplications, except for pure sine-wave signals of known frequency. M
16、easurements made with narrowband filters (see 3.6.2) are an exception, as the output of a narrowband filter approximates a sine wave. Complex vibration signals require actual integrations.Although in theory it would be possible to convert a velocity signal to an equivalent acceleration signal by mea
17、ns of a differentiation, this is not done in practice because differentiation enhances high-frequency noise. 3.2 Accelerometers An accelerometer contains a seismic mass mounted on a piezoelectric element, typically quartz or a special type of ceramic material, which produces an electrical charge in
18、proportion to the force exerted on the element. Acceleration of the accelerometer body produces a force on the seismic mass, and therefore on the piezoelectric element, generating an electrical charge, typically of the order of tens of picocoulombs per unit of acceleration due to gravity. This charg
19、e is a relatively weak, high-impedance signal, which therefore is subject to electrical noise interference. Special low-noise cable should be used between an accelerometer and the first amplifier in the system, to prevent mechanical vibration of the cable from generating spurious electrical signals
20、caused by triboelectrical effects. Relative motion between mating connectors in this circuit can produce spurious signals similarly. Great care is needed in grounding accelerometer systems. Ground loops may inject excessive noise into the circuit. The amplifier should have a differential input, able
21、 to reject large amounts of common-mode noise. Typically the first amplifier is a charge amplifier, which accepts the electrical charge that was developed by the accelerometer and produces a low impedance voltage output that is accurately proportional to the input charge, and therefore to the accele
22、ration. When using single ended microdot accellerometers, which are used represent approximately 50% of all accelerometers in use, care must be taken to avoid creating ground loops in the wiring between the accellerometer and the amplifier. Accelerometers (as well as velocity transducers) need diffe
23、rential amps for high CMRR (Common Mode Rejection Ratio). Some manufacturers now offer accelerometers which contain one or more stages of amplification within the accelerometer housing. This avoids the triboelectrical effects which were discussed above, permitting use of ordinary electrical cabling.
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- SAEARP60682010GASTURBINEENGINETESTFACILITYVIBRATIONMEASUREMENT 燃气 涡轮 发动机 测试 设备 振动 测量 PDF

链接地址:http://www.mydoc123.com/p-1023220.html