1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 14 March 2003 prEN 3841 -506 Edition P 3 March 2003 Comments should be sent within six months after the date of publication to Electrical Domain AECMA-STAN ICs: 49.060 Descriptors: ENGLISH VERSION Supersedes edition P 2 September
2、 1998 Aerospace series Circuit breakers Test methods Part 506: Vibration performance Srie arospatiale Disjoncteurs Mthodes dessais Partie 506 : Tenue aux vibrations Luft- und Raumfahrt Schutzschalter Prfverfahren Teil 506: Schwingungsverhalten This “Aerospace Series“ Prestandard has been drawn up un
3、der the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published on green paper for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to
4、 the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN it will be submitted as a
5、 draft European Standard to CEN (European Committee for Standardization) for formal vote. I I Copyright 2003 O by AECMA-STA1 Page 2 prEN 3841-506: 2003 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Electrical Domain. After inquiries and votes carried out in a
6、ccordance with the rules of AECMA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 3841-506: 2003 1 Scope This standard specifies a method of verifying the vibration performance of circuit breakers. It shall be used together with E
7、N 3841-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments t
8、o or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 7137, EN 3841-100, MI L-STD-81 OF, Aircraft - Environmental conditions and test pro
9、cedures for airborne equipment) Aerospace series - Circuit breakers - Test methods - Patt 700: General 2) Environmental engineering considerations and laboraty tests 3) 3 Method 3.1 Mounting The circuit breakers shall be mounted on the vibrator according to 4.2 and 4.3 of EN 3841-100. The means of m
10、ounting shall be designed so as to transmit vibrations over the whole frequency range without absorption or natural resonance. The electrical connection shall be made with the cables of the sections specified in EN 3841-100, Table 1. The connection cables shall be attached to the vibration support a
11、pproximately 100 mm from the terminals. The circuit breakers and the cables shall be mounted with the torque indicated in the product standard. 3.2 Procedure The circuit breakers shall be subjected to: - the sinusoidal vibration test according to IS0 7137, test procedure 2.2; - the random vibration
12、test according to IS0 7137, test procedure 2.2; - the test at low frequencies and sustained engine imbalance; - the gunfire vibration test according to MIL-STD-810F, method 519.3, if specified. The test shall be carried out in three mounting positions along the main axis of the circuit breakers, in
13、the closed and open position The test conditions and vibration values shall conform to the technical specification. During the test the contacts do not close for a period 2 10 ps (circuit breakers in the open position) or open for a period 2 10 ps (circuit breakers in the closed position). 1) Endors
14、ement of EUROCAEIED-14C and RTCNDO-160C 2) Published as AECMA Prestandard at the date of publication of this standard 3) Published by: Department of Defense (DOD), the Pentagon, Washington D.C. 20301 USA. Page 4 prEN 3841-506: 2003 The test periods at sinusoidal vibration shall include determination
15、 of the resonant frequencies and a period to be determined as follows: - resonance: if applicable, 30 min per resonance; - sweep: remainder of total time specified. The test period at sustained engine imbalance shall carried out in 2 steps: Step 1: With the equipment operating, sweep cycle the vibra
16、tion frequency over the appropriate frequency range from the lowest to the highest (up-sweep) to the lowest (down-sweep) with a logarithmic sweep rate according to technical specification. During the initial up-sweeps, record plots of the accelerometers at the response locations selected and identif
17、y the critical frequencies. Critical frequencies are defined at those frequencies where: - mechanical vibration resonances have peak acceleration amplitudes greater than twice the input acceleration amplitude, or - a change in performance or behaviour is noticeable whether or not performance standar
18、ds are exceeded. If any, select the most severe frequency. For the critical frequency identified (if one), dwell at this frequency for 170 minutes minimum. During the resonance dwell, the applied frequency shall be adjusted, if necessary, to maintain the maximum acceleration response at the vibratio
19、n resonance being dwelled. Any change in the critical frequency that occurs during the test shall be noted. If no critical frequency is identified, then no dwells need to be performed. Continue sweep cycling the vibration frequency over the appropriate frequency range with a logarithmic sweep rate a
20、ccording to technical specification for the 170 minutes minimum. Note that the time spent performing the initial up-sweeps may be included in the total sweep time (1 70 minutes). Step 2: With the equipment operating, perform one sinusoidal linear frequency sweep from the highest to the lowest at a sweep rate according to technical specification. 3.3 Requirement Requirements in accordance with technical specification and product standard.
