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1、ANSI/IEEE Std 293-1 969 (IEEE Reaffirmed June 19. 1986) Approved November 17, 1986 American National Standards Institute IEEE Test Procedure for Single-Degree-of-Freedom Spring-Restrained Rate Gyros Published by The Institute of Electrical and Electronics Engineers, Inc 345 East 47th Street, New Yor
2、k, N Y 10017, USA ,A/O/(“/s) at (U,/ (b) Amplitude measurement method, Means of measuring the peak amplitude of the input rate, Means of measuring the in-phase component of the gyro output. 4.22.1.3 Test Setup and Procedure 4.22.1.3.1 Test Setup. Mount the gyro on the oscil- lating rate table with t
3、he gyro IRA aligned parallel to the axis of the table and nominally vertical. Operate the gyro in accordance with the standard test conditions of paragraph 3.1. Connect the gyro pickoff output and the table rate output to the phase measuring device. 4.22.1.3.2 Test Procedure 4.22.1.3.2.1 Natural Fre
4、quency. Apply a sinusoidal input of f _ O /s peak. Determine the input frequency f, at which the gyro output lags the input rate by 90 f _ degrees. 4.22.1.3.2.2 Damping Ratio. Apply a sinusoidal input rate of f O/s peak at frequencies of fJa, fJb, , f hertz where a, b, etc., are determined by the us
5、ers requirements. Measure the phase relation between the gyro input and output or 4.22.1.4 Test Results 4.22.1.4.1 Natural Frequency. The natural frequency f . measured in paragraph 4.22.1.3.2.1 shall conform to the requirement of paragraph - . 4.22.1.4.2 Damping Ratio. The damping ratio is cal- cul
6、ated from the data obtained in paragraph 4.22.1.3.2.2 -. by comparing the measured phase relationships with a phase angle-frequency plot for a damped second-order / k measure the peak amplitude of the gyro output. system or by comparing the measured amplitude ratios with an amplitude-frequency plot
7、for a damped second- order system. The damping ratio shall conform to the requirement of paragraph - . 4.22.2 Step Input Method 4.22.2.1 Purpose. The purpose of this test is to deter- mine the natural frequency and the damping ratio of the gyro by measuring its response to a step input. 4.22.2.2 Tes
8、t Equipment. The following test equipment from paragraph 3.2 is required for this test: Means of applying a step rate input to the gyro, Means of recording the gyro response to a step rate input. 4.22.2.3 Test Setup and Procedure. Mount the gyro on the step rate table with the gyro IRA aligned paral
9、lel to the axis of the table and nominally vertical. Operate the gyro in accordance with the standard test conditions of paragraph 3.1. Connect the gyro pickoff output and the table motion output to the recorder. Apply a change of rate from _ O/s to .- f - O/s during a period not to exceed _ seconds
10、. Record the gyro and the table motion outputs. 4.22.2.4 Test Results. The gyro natural frequency and damping ratio are determined by comparing the recorded response with the step response of a damped second-order system. The natural frequency shall con- form to the requirement of paragraph - , and
11、the damping ratio shall conform to the requirement of para- graph - 4.23 Warm-up Time Test 4.23.1 Purpose. The purpose of this test is to determine the time interval required for the gyro to reach specified performance from the instant that it is energized under specified operating conditions. 4.23.
12、2 Test Equipment. The following test equipment from paragraph 3.2 is required for this test: Oscillating rate table (means of applying a sinusoidal rate to the gyro at a controlled frequency and am- plitude), Means of measuring the in-phase component of the gyro output, Means of measuring the elapse
13、d time. 4.23.3 Test Setup and Procedure. Mount the gyro on the oscillating rate table with the gyro IRA aligned parallel to the axis of the table and nominally vertical. Operate the gyro in accordance with the standard test conditions of paragraph 3.1 except that the thermal and mechanical starting
14、conditions shall be and the energizing sequence shall be - . 13 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:11 MDTNo reproduction or networking permitt
15、ed without license from IHS -,-,- 14 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:11 MDTNo reproduction or networking permitted without license from IHS
16、 -,-,- 00 NNN 0 COMMENTS SPECIAL TEST MAY BE RUN TO DETERMINE I F MOTOR REMAINS I N SYNC. CENTRIFUGE TESTS FOR ACCEL-SEWS. DRIFT USUALLY RUN WITH SPIN MOTOR-OFF. SPECIAL TEST MAY SE RUN TO OETERMlNE I F MOTOR REMAINS I N SYNC. SPECIAL TEST MAY BE RUN TO DETERMINE I F MOTOR REMAINS I N SYNC. PARAMETR
17、IC TESTS TO BE PERFOMEC AT INTERVALS TO BE SPECIFIED FOR EACH TEST. SPECl4L TEST MAY BE RUN TO DETERMINE I F MOTOR REMAINS I N SYNC. SPECIAL TESTS MAY BE ?UN TO DETERMINE I F MOTOR REMAINS I N SYNC. AN0 USING TORQUER TO DETERMINE RATE TRANSFER CHARACTCRISTICS. THE HAZARDS OF POST-EXPOSURE HANDLING S
18、HOULD BE CONSIDERED. 15 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:11 MDTNo reproduction or networking permitted without license from IHS -,-,- Apply
19、a sinusoidal input rate of f L_ O/s peak at a frequency of f h e r t z . Energize the gyro and simultaneously start the elapsed time re- corder. Measure the peak amplitude of the gyro output. When this output reaches - f O / s , stop the elapsed time recorder. 4.23.4 Test Results. The elapsed time m
20、easured shall conform to the requirement of paragraph - . 4.24 Environmental Test Series Procedures for most environmental tests are well covered by existing industry, government, and military documents, an example of which is MIL-E-5272, “En- vironmental Testing, Acroiisutical and Associated Equip-
21、 ment,” Rather than duplicate samples of existing procedures, this Test Procedure provides assistance in selecting the gyro parameters that will be most im- portant to measure in each environment. This selection is made based on the expected environmental sensitiv- ities of the spring-restrained sin
22、gle-degree-of-freedom rate gyro and the cost effectiveness of the testing. The application of the gyro will determine which tests, or combinations of tests, arc pertinent. 4.24.1 Purpose. The purpose of these tests is to verify that the gyro performs as specified during and/or after subjection to en
23、vironments outside of the standard operating conditions, but within the specified environ- mental limits. 4.24.2 Test Equipment. The following test equipment from paragraph 3.2 is required for each environmental test: Equipment for providing the specified environment, Means of measurement of the env
24、ironment and time, Adaptation of the gyro to the environmental equipment such as special holding fixtures, cables, etc, Equipment for thc gyro test, chosen as indicated in paragraphs 4.1 through 4.22. 4.24.3 Test Procedure. Detail the procedure for the manipulation of the environment, including the
25、toleranccs and the rates of change, integrated with the procedure for the gyro test. Caution notes on overlosd limits on the environmental intensity applied to the gyro can be specified if required. 4.24.4 Test Results. Parametric test data shall include the additional notation of the environment in
26、 which it was obtained. Where required, the gyro data shall be plotted versus the environmental intensity in order to determine the sensitivity. Table 1 is intended to be a guide for the selection of the gyro test that should be conductled in association with the environmental tests that are chosen
27、dependent on the applicatiatl of the gyro. The coding is as follows: D = The gyro parametric test isR-to be conducted while the gyro is operating or nonoperating as applicable, during the specified environment. 0 = The gyro is to be operated during the specified environment and the parametric test p
28、erformed before and after. N = The gyro is to be nonoperating during the specified environment, and the parametric test performed before and after. S = A special test is recommexletl as described under Comments. When Monitor Output is the requirement, further clari- fication is necessary as to how o
29、utput variation is to be judged. 16 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:11 MDTNo reproduction or networking permitted without license from IHS -,-,-