JJG 948-1999 Verification Procedure for Digital Electrodynamic Vibration Test System JJG948-1999 Standard download decompression password: www.bzxz.net
This procedure applies to the verification of digital electrodynamic vibration test systems that are newly manufactured, in use, or after repair with a rated sinusoidal thrust or random thrust of less than 100kN.

National Verification Regulations of the People's Republic of China JJG948—1999
Digital Electrodynamic Vibratlon Testing System
Digital Electrodynamic Vibratlon Testing System Issued on December 22, 1999
Implementation on April 1, 2000
Issued by the State Administration of Quality and Technical Supervision
.LIG 948—1599
Verification Regulations of Digital Electrodynamic Vibratlon Testing System
J.IG 948—1999
This regulation was approved by the State Administration of Quality and Technical Supervision on December 22, 1999, and came into effect on April 1, 2000.
Responsible unit: Enterprise National Vibration Shock Tachometer Technical Committee Drafting unit: China Aviation Industry Corporation 324 Research Institute China Military Science Research Institute
This regulation is interpreted by the National Vibration Shock Tachometer Technical Committee. The main drafter of this regulation:
Hong Baolin
Additional drafters:
Zheng Jinglao
J.IG 948—1999
(34th Research Institute of China Aviation Industry Corporation)(China Jiying Science Research Institute)bzxZ.net
(Beijing Zhongyuan Micro Devices Company)
(14th Research Institute of China Aviation Industry Corporation)(China Institute of Metrology)
2 Technical requirements
2.1 Environmental conditions during test system verification
2.2 Identification of test system:
Digital vibration controller.
2.5 Sine vibration test system||tt ||2.6 Random vibration test system:
Normal band random vibration test
2.8 Narrow band random plus wide band random vibration test 2.9 Impact test system
3 Verification items and verification equipment
4 Verification method
4.1 Applicable scope
4.2 Inspection of test system
JIC948—1999
4.3 Verification of maximum operating pressure of test system 4.4 Verification of vibration table according to requirements
Verification of frequency indication error of digital vibration controller
Verification of harmonic distortion of positive signal of digital vibration controller4.7
Verification of dynamic range of random closed-loop acceleration spectrum control of digital vibration controller4.8
Verification of random signal of digital vibration controller: Verification of consistency between any two channels of multi-channel digital vibration measurementVerification of acceleration signal-to-frequency ratio of test system
Verification of sequence response characteristics of test system
Test system bench test of this wave head Verification of the test system before passing the value and uniformity control test system Verification of the table top transverse vibration ratio test system table top acceleration, velocity pressure, displacement indication error verification
Verification of the indication stability of the sweep frequency
Test system verification of sinusoidal thrust
Test system verification of the dynamic range of acceleration power control adjustment
(1)
(4)
JJG 94R—1999
Test system for verification of total RMS value of acceleration and power spectrum density control accuracyTest system for verification of random thrust
Test system for verification of total RMS value indication of random vibration with sine broadbandTest system for verification of amplitude indication of random vibration with sine broadbandTest system for verification of viscosity control with sine broadband random vibration: (15)
Test system for verification of total RMS value indication error of random perturbation acceleration with random broadband1. Test system for verification of spectral density value of random vibration with random broadbandTest system for verification of control accuracy of random vibration with random broadbandTest system for verification of basic shock acceleration waveform parameters5. Verification result processing and verification period
5.1 Verification result processing:
5.2 Verification period
Appendix: Verification of random signal
JJG 948--1999
Verification Procedure for Digital Electrodynamic Vibration Test System This procedure is applicable to the test system with a rated sinusoidal thrust or random thrust of 100
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