1、.- I NOT MEASUREMENT 1 SENSITIVE MIL-STD-2225 O1 August 1994 MILITARY STANDARD VIBRATION AND NOISE TESTING FOR INSTRUMENT BEARINGS AMSC NIA FSC 3110 DISTRIBUTION STATEMENT A. unlimited. Approved for public release; distribution is Licensed by Information Handling ServicesMIL-STD-2225 m 9999933 04757
2、40 330 m MIL-STD-2225 FOREWORD 1. of the Department of Defense. This military standard is approved for use by al 2. Beneficial comments (recommendations, additions, pertinent data which may be of use in improving this addressed to: Commander, Naval Air Warfare Center A Departments and Agencies delet
3、ions) and any document should be rcraft Division, (Code SR3), Highway 547,-Lakehurst, NJ self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 3. This document sets forth a standard test method for vibration and noise in instr
4、ument bearings. 08733-5100, by using the ii Licensed by Information Handling ServicesMIL-STD-2225 CONTENTS PARAGRAPH 1 . 1.1 2 . 2.1 2.1.1 2.2 2.3 3 . 3.1 3.2 4 . 4.1 4.2 4.3 4.4 4.5 4.6 4.6.1 4.7 4.8 4.9 5 . 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.4 5.5 5.6 5.7 5.8 5.9 6 . 6.1 6.2 SCOPE 1 Scope 1 APPLICABL
5、E DOCUMENTS . 1 Government documents . 1 Specifications and standards . 1 Non-Government publications 2 Order of precedence 2 DEFINITIONS 2 Bearing noise 2 Bearing vibration 2 GENERAL REQUIREMENTS . 2 Test requirements 2 Vibration velocity amplitude . 2 Frequency masking 2 Speeds . 2 Physical measur
6、ement . 3 Test preparation . 3 Stabilizing 3 Calibration 3 Signal evaluation 3 Loads 3 DETAILED REQUIREMENTS 3 Package removal 3 Degaussing . 3 Integral oil lubrication . 3 Cleaning . 3 Lubrication 4 Oil distribution . 4 Operation 4 Frequency range 4 Load distribution 4 Test readings 4 Retesting 4 R
7、elubrication 4 NOTES 5 Intended use . 5 Subject term (key word) listing 5 iii Licensed by Information Handling ServicesTABLE I. _ _ MIL-STD-2225 9999933 0475742 103 MIL-STD-2225 CONTENTS PAGE Lubrication of bearings 4 iv Licensed by Information Handling ServicesMIL-STD-2225 m 99999311 0975793 04T m
8、MIL-STD-2225 1. SCOPE 1.1 Scope. Vibration and noise measurements under controlled test conditions provide baseline data which can be used to ascertain relative bearing quality. The causes of vibration and noise are complex phenomena affected by many factors. measurements under closely controlled co
9、nditions, and there is no guarantee that values measured in accordance with this standard will correlate with actual application. This specification is applicable to instrument ball bearings as defined in AFBMA Standard 12, see 2.2. This standard defines vibration and noise 2. APPLICABLE DOCUMENTS 2
10、.1 Government documents. 2.1.1 Specifications and standards. The followin specification and standards form a part of this standard to the extent specified herein. otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and
11、 Standards (DODISS) and supplement thereto, cited in the solicitation. Unless SPECIFICATIONS MI L ITARY MIL-L-6085 - Lubricating Oil, Instrument, A MIL-P-197 - Packaging of Antifriction Bear Vol ati 1 i ty. Parts and Subassemblies. rcraft, Low ngs; Associated DOD-L-81846 - Lubricating Oil, Instrumen
12、t, Ball Bearing, High Flash Point. STANDARDS FEDERAL FED-STD-209 - Clean Room and Work Station Requirements, Controlled Environment. MI L ITARY MIL-STD-45662 - Calibration Systems Requirements. (Unless otherwise indicated, copies of federal and military specifications, standards and handbooks are av
13、ailable from the Defense Printing Service, Subscription Services Desk, 700 Robbins Avenue, Bldg. 4D, Phi 1 adel phi a, PA 191 11-5094. ) Licensed by Information Handling ServicesMIL-STD-2225 9LL 0475744 T8b MIL-STD-2225 2.2 Non-Government publications. The following documents form a part of this doc
14、ument to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of the documents not listed in the DODISS are the issues of the documents
15、cited in the solicitation. ANTI-FRICTION BEARING MANUFACTURERS ASSOCIATION (AFBMA) AFBMA-STD-12 - Instrument Ball Bearings. (Application for copies should be addressed to the AFBMA, 1101 Connecticut Ave. N.W., Suite 700, Washington, D.C. 20036-3283.) 2.3 Order of precedence. In the event of a confli
16、ct between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. DEFINITIONS 3.1 Bearinq noise. The bearing vibration in th
17、e audible range. 3.2 Bearinq vibration. The frequencies and amplitudes of motion of the bearing other than its required primary rotational motion. 4. GENERAL REQUIREMENTS 4.1 Test reauirements. The specific test requirements for each bearing shall be as specified in the applicable specification. As
18、a minimum, these shall include test speed, test load and vibration limits. 4.2 Vibration velocity amplitude. The vibration velocity amplitude shall be the standard display objective obtained by means of displacement, velocity, acceleration or force measurements. Standard international units of measu
19、rement shall be used. 4.3 Freaiiency maskinq. The tester shall be capable of masking off or selecting specified frequency ranges. 4.4 Speeds. The tester shall be capable of testing for bearing vibration at rotational speeds specified by the applicable specification within the range of 300 to 3600 Re
20、volutions Per Minute (RPM). The test shall . be performed with one bearing ring rotating and the other ring non-rotating. 2 Licensed by Information Handling ServicesMIL-STD-2225 H 9999LL 0475745 912 MIL-STD-2225 4.5 Physical measurement. The physical quantity measured by the transducer shall be the
21、radial or axial component of the vibration of the non-rotating bearing ring. velocity, acceleration, or force, but preferred final display shall be vel oci ty . Transducers may measure vibrational displacement, 4.6 Test Dreparation. The following conditions shall govern hand1 ing, cleaning, lubricat
22、ion, and test ambient conditions: temperature shall be maintained between 20 to 25OC (68 and 77OF), with relative humidity between 30 and 50 percent; cleanliness shall be maintained at a class 10,000 level as speci fi ed in FED-STD-209. temperature by remaining in the test room for 2 hours prior to
23、testing. 4.6.1 Stabilizinq, Bearings shall be thermally stabilized to room 4.7 Calibration. The test device calibration shall conform to all the requirements of MIL-STD-45662 and be traceable to the National Institute of Standards and Techno1 ogy. 4.8 Siqnal evaluation. The output signal shall be ev
24、aluated on a true Root Mean Square (RMS) basis for each of the frequency ranges specified by the applicable specification. avai 1 ab1 e for analytical purposes. Access to the raw, real time signal shall be 4.9 Loads. Unless otherwise specified, axial loads of 75 grams shall be used for bearings with
25、 an outer ring outer diameter of 0.3750 inches and less, and 400 grams for bearings greater than 0.3750 inches in outer ring outer diameter. The equivalent outer ring outer diameter for metric bearings is 10mm. The external radial load, including transducer load, shall be not greater than 15 percent
26、 of the applied axial load. 5. DETAILED REQUIREMENTS 5.1 Packaqe removal. Bearings shall not be removed from their packages outside of a class 10,000 or better clean room as specified in FED-STD-209. 5.2 Deqaussinq. Steel bearings to be tested shall be degaussed to a 5.3 Intesral oil lubrication. Be
27、arings supplied with integral oil maximum of 2 gauss. lubrication may be tested as received, or processed as specified in 5.3.1 through 5.3.3. extraneous effects that may render erratic results. The use of grease or non-oil lubricants may introduce 5.3.1 Cleaninq. Bearings shall be cleaned thoroughl
28、y with clean solvents filtered through a 0.5 micron or better filter. 3 Licensed by Information Handling ServicesMIL-STO-2225 Fearing O.O. 5.3.2 Lubrication. Lubricate bearings per Table I with MIL-L-6085 or DOO-L-81846 oil filtered through a 0.45 micron or better filter and having a viscosity not e
29、xceeding 20 centistokes at 37.8OC (1OOOF). Amount of Oil I/ (Lessthan 0.6250 inch IEqual to or greater than 0.6250 inch1 1 drop 2 drops - i/ Oil drops from a #26 needle, free forming from a nominal needle angle of 45 degrees from vertical. 5.3.3 Oil distribution. Rotate the bearing at less than 20 R
30、PM for a minimum of 3 complete revolutions in each direction to distribute the oil evenly. 5.4 Operation. The test equipment shall be operated in accordance with the test equipment manufacturers instructions. 5.5 FreauencY ranqe. Unless otherwise specified, the frequency range 5.6 Load distributi-.
31、Unless otherwise specified, the axial test load for measuring vi bration amp1 i tude shall be 50 Hertz (Hz) to 5 Kilohertz (KHz) . (see 4.9) shall be evenly and circumferentially distributed across the face of the designated ring. Where design allows, the bearing shall be turned over and retested. 5
32、.7 Test readinqs. Test readings shall be taken within the specified speed range. 5.8 Retesting. When retesting of a failed bearing is permitted by the applicable drawing/specification, procedures established under 4.6 and 5.3 shall be followed. This may be done no more than twice on any bearing. 5.9
33、 Relubrication. Bearings passing the tests shall be relubricated in accordance wi t h the appl i cab1 e speci fi cat i on i f necessary and packaged per MI L- P- 197. 4 Licensed by Information Handling ServicesMIL-STD-2225 9999933 0475747 795 MIL-STD-2225 6. NOTES (Thi s sect i on contains informati
34、on of a general or expl anatory nature that may be helpful, but is not mandatory.) 6.1 Intended Use. This standard provides procedures for the measurement of vibration and noise generated by rotating instrument ball bearings. includes requirements for the test equipment, methods of testing, test parameters and interpretation of data. It 6.2 Subject term (key word) listing. Test procedures Custodians: Navy - AS Army - AT Air Force - 99 Preparing activity: Navy - AS (Project 3110-0810) Review activities: Air Force - 84 DLA - IS 5 Licensed by Information Handling Services
