This regulation is applicable to verification of newly-manufactured, in-service and repaired electrodynamic vibration testing system, of which the rated sine thrust or random thrust is less than 100kN.
1 General
The digital electrodynamic vibration testing system (hereinafter referred to as "testing system") is an integrated equipment intended to produce the excitation like sine on random, sine on broad-band random, narrow-band random on broad-band random and impact. It generally consists of electrodynamic vibration generator system, power amplifier, digital vibration controller and auxiliary equipment.
2 Technical Requirements
2.1 Verification Conditions of Testing System
2.1.1 Testing system shall be installed according to relevant technical requirements;
2.1.2 The ambient temperature of working testing system is (5~35)℃ and the relative humidity is not greater than 90%;
2.1.3 Testing system shall remain clean without corrosive gas or liquid around;
2.1.4 Power supply voltage shall vary within ±10% of rated voltage;
2.1.5 The user shall take noise countermeasures if noise pressure level generated by the working testing system is greater than 90dB (A-weighted).
2.2 Marking of Testing System
Each component of the testing system shall be provided with a nameplate, indicating model and specification, manufacturer, end-of-manufacturing number and date and the product certificate must be provided when delivered out of the factory.
2.3 Excitation Device
When the excitation device is in working state, the magnetic flux leakage on the whole plane at the altitude of 1/4 diameter of maximum distribution circle of the mounting screw in the table top shall meet the end-of-manufacturing technical requirements.
2.4 Digital Vibration Controller
2.4.1 As for the digital vibration controller, the frequency indication error within an assigned frequency is shown as Table 1.
1 General
2 Technical Requirements
2.1 Verification Conditions of Testing System
2.2 Marking of Testing System
2.3 Excitation Device
2.4 Digital Vibration Controller
2.5 Sinusoidal Vibration Testing System
2.6 Random Vibration Testing System
2.7 Sine on Broad-band Random Vibration Testing
2.8 Narrow-band on Broad-band Random Vibration Testing
2.9 Impact Testing System
3 Verification Items and Equipment
4 Verification Methods
4.1 Application Scope
4.2 Inspection of Testing System
4.3 Verification of Highest Noise during Running of Testing System
4.4 Verification of Magnetic Flux Leakage of Vibration Generator System Table
4.5 Verification of Frequency Indication Error of Digital Vibration Controller
4.6 Verification of Sinusoidal Signal Harmonic Distortion of Digital Vibration Controller
4.7 Verification of Dynamic Range of Random Self-Closed Ring Acceleration Power Spectrum Control of Digital Vibration Controller
4.8 Inspection of Random Signal of Digital Vibration Controller
4.9 Verification of Consistency Between Any Two Channels of Multichannel Digital Vibration Controller
4.11 Verification of Frequency Response Characteristics of Testing System
4.12 Verification of Acceleration Harmonic Distortion for the Testing System Table
4.13 Verification of Amplitude Uniformity for the Testing System Table
4.14 Verification of Transverse Vibration Ratio for the Testing System Table
4.15 Verification of Indication Errors for Acceleration, Speed and Displacement of the Testing System Table
4.16 Vibration of Constant Vibration Accuracy of Frequency Sweep
4.17 Verification of Stability of Acceleration Amplitude Indication
4.18 Verification of Sine Thrust of the Testing System
4.19 Verification of Acceleration Power Spectrum Control Dynamic Range of the Testing System
4.20 Verification of Overall Acceleration Root-mean-square Value of the Testing System
4.21 Verification of Indication of Acceleration Power Spectrum Density
4.22 Verification of Overall Acceleration Root-mean-square Value and Power Spectrum Density Control Accuracy of the Testing System
4.23 Verification of Random Thrust of the Testing System
4.24 Verification of Indication of Overall Acceleration Root-mean-square Value for Sine on Broadband Random Vibration of the Testing System
4.25 Verification of Indication of Sine on Broad-band Random Vibration Amplitude of the Testing System
4.26 Verification of Control Accuracy of Sine on Broad-band Random Vibration of the Testing System
4.27 Verification of Indication Error of Overall Acceleration Root-mean-square Values for Narrow-band on Broad-band Random Vibration of the Testing System
4.28 Verification of Indication of Acceleration Spectrum Density for Narrow-band on Broad-band Random Vibration of the Testing System
4.29 Verification of Control Accuracy of Narrow-band on Broad-band Random Vibration of the Testing System
4.30 Verification of Waveform Parameter for Basic Impact Acceleration of the Testing System
5 Verification Result Processing and Verification Period
5.1 Verification Result Processing
5.2 Verification Period
Appendix A Inspection of Random Signal
This regulation is applicable to verification of newly-manufactured, in-service and repaired electrodynamic vibration testing system, of which the rated sine thrust or random thrust is less than 100kN.
1 General
The digital electrodynamic vibration testing system (hereinafter referred to as "testing system") is an integrated equipment intended to produce the excitation like sine on random, sine on broad-band random, narrow-band random on broad-band random and impact. It generally consists of electrodynamic vibration generator system, power amplifier, digital vibration controller and auxiliary equipment.
2 Technical Requirements
2.1 Verification Conditions of Testing System
2.1.1 Testing system shall be installed according to relevant technical requirements;
2.1.2 The ambient temperature of working testing system is (5~35)℃ and the relative humidity is not greater than 90%;
2.1.3 Testing system shall remain clean without corrosive gas or liquid around;
2.1.4 Power supply voltage shall vary within ±10% of rated voltage;
2.1.5 The user shall take noise countermeasures if noise pressure level generated by the working testing system is greater than 90dB (A-weighted).
2.2 Marking of Testing System
Each component of the testing system shall be provided with a nameplate, indicating model and specification, manufacturer, end-of-manufacturing number and date and the product certificate must be provided when delivered out of the factory.
2.3 Excitation Device
When the excitation device is in working state, the magnetic flux leakage on the whole plane at the altitude of 1/4 diameter of maximum distribution circle of the mounting screw in the table top shall meet the end-of-manufacturing technical requirements.
2.4 Digital Vibration Controller
2.4.1 As for the digital vibration controller, the frequency indication error within an assigned frequency is shown as Table 1.
Contents of JJG 948-1999
1 General
2 Technical Requirements
2.1 Verification Conditions of Testing System
2.2 Marking of Testing System
2.3 Excitation Device
2.4 Digital Vibration Controller
2.5 Sinusoidal Vibration Testing System
2.6 Random Vibration Testing System
2.7 Sine on Broad-band Random Vibration Testing
2.8 Narrow-band on Broad-band Random Vibration Testing
2.9 Impact Testing System
3 Verification Items and Equipment
4 Verification Methods
4.1 Application Scope
4.2 Inspection of Testing System
4.3 Verification of Highest Noise during Running of Testing System
4.4 Verification of Magnetic Flux Leakage of Vibration Generator System Table
4.5 Verification of Frequency Indication Error of Digital Vibration Controller
4.6 Verification of Sinusoidal Signal Harmonic Distortion of Digital Vibration Controller
4.7 Verification of Dynamic Range of Random Self-Closed Ring Acceleration Power Spectrum Control of Digital Vibration Controller
4.8 Inspection of Random Signal of Digital Vibration Controller
4.9 Verification of Consistency Between Any Two Channels of Multichannel Digital Vibration Controller
4.11 Verification of Frequency Response Characteristics of Testing System
4.12 Verification of Acceleration Harmonic Distortion for the Testing System Table
4.13 Verification of Amplitude Uniformity for the Testing System Table
4.14 Verification of Transverse Vibration Ratio for the Testing System Table
4.15 Verification of Indication Errors for Acceleration, Speed and Displacement of the Testing System Table
4.16 Vibration of Constant Vibration Accuracy of Frequency Sweep
4.17 Verification of Stability of Acceleration Amplitude Indication
4.18 Verification of Sine Thrust of the Testing System
4.19 Verification of Acceleration Power Spectrum Control Dynamic Range of the Testing System
4.20 Verification of Overall Acceleration Root-mean-square Value of the Testing System
4.21 Verification of Indication of Acceleration Power Spectrum Density
4.22 Verification of Overall Acceleration Root-mean-square Value and Power Spectrum Density Control Accuracy of the Testing System
4.23 Verification of Random Thrust of the Testing System
4.24 Verification of Indication of Overall Acceleration Root-mean-square Value for Sine on Broadband Random Vibration of the Testing System
4.25 Verification of Indication of Sine on Broad-band Random Vibration Amplitude of the Testing System
4.26 Verification of Control Accuracy of Sine on Broad-band Random Vibration of the Testing System
4.27 Verification of Indication Error of Overall Acceleration Root-mean-square Values for Narrow-band on Broad-band Random Vibration of the Testing System
4.28 Verification of Indication of Acceleration Spectrum Density for Narrow-band on Broad-band Random Vibration of the Testing System
4.29 Verification of Control Accuracy of Narrow-band on Broad-band Random Vibration of the Testing System
4.30 Verification of Waveform Parameter for Basic Impact Acceleration of the Testing System
5 Verification Result Processing and Verification Period
5.1 Verification Result Processing
5.2 Verification Period
Appendix A Inspection of Random Signal
