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JJF 1570-2016 English PDF

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JJF 1570-2016: Calibration Specification for Dynamic Balance Measuring Instruments
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Basic data

Standard ID JJF 1570-2016 (JJF1570-2016)
Description (Translated English) Calibration Specification for Dynamic Balance Measuring Instruments
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Classification of International Standard 17.160
Word Count Estimation 20,276
Date of Issue 2016-06-27
Date of Implementation 2016-09-27
Quoted Standard JJG 105-2000; JJG 134-2003; JJG 233-2008; JJG 644-2003; JJG 676-2000; JJG 834-2006; JJF 1059.1-2012
Regulation (derived from) Notice of the General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China 2016 No.16
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine
Summary This standard is applicable to the calibration of the dynamic balance measuring analyzer (hereinafter referred to as dynamic balancer).

JJF 1570-2016: Calibration Specification for Dynamic Balance Measuring Instruments

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Calibration Specification for Dynamic Balance Measuring Instruments National Metrological Technical Code of the People's Republic of China Calibration standard for on - site dynamic balance measurement analyzers 2016-06-27 released 2016-09-27 implementation State Administration of Quality Supervision, Inspection and Quarantine issued Field dynamic balance measurement analyzer Calibration specification Responsible unit. National vibration impact speed measurement technology committee The main drafting unit. China Testing Technology Research Institute Participated in the drafting unit. China Aviation Industry Group Beijing Great Wall Metrology and Testing Technology Research Institute This specification entrusts the National Vibration Impact Speed Measurement Technical Committee to explain The main drafters of this specification. Zhu Sha (China Testing Technology Research Institute) Participate in the drafters. Fang Chao (China Testing Technology Research Institute) Zeng Wu (China Aviation Industry Group Beijing Great Wall Metrology and Testing Technology Research Institute)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Terms and definitions (1) 3.1 Balance efficiency (1) 4 Overview (1) 5 Metrological characteristics (2) 5.1 Sensor reference sensitivity (2) 5.2 Amplitude-frequency characteristics (2) 5.3 amplitude linearity (2) 5.4 phase frequency characteristics (2) 5.5 Phase linearity (2) 5.6 Channel Consistency (2) 5.7 Speed (2) 5.8 Balanced efficiency (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Standard equipment and other equipment for calibration (2) 7 Calibration items and calibration methods (3) 7.1 Calibration items (3) 7.2 Calibration method (4) 8 Calibration results (7) 8.1 Calibration records (7) 8.2 Calibration Certificate (8) 8.3 Uncertainty of calibration results (8) 9 re-school time interval (8) Appendix A Calibration Original Record Recommended Format (9) Appendix B Contents of the Calibration Certificate (11) Appendix C Examples of Uncertainty Evaluation (14)

Introduction

This specification is based on JJF 1071 "National Metrological Calibration Rules". Which evaluates the uncertainty of the measurement According to JJF 1059.1 "measurement uncertainty assessment and presentation" to write. This specification is the first release. Calibration standard for on - site dynamic balance measurement analyzers

1 Scope

This specification applies to the calibration of a dynamic balance measuring analyzer (hereinafter referred to as a dynamic balancer).

2 reference file

This specification refers to the following documents. JJG105-2000 tachometer verification procedures Test procedure for magnetoelectric velocity sensor JJG134-2003 JJG233-2008 Verification of piezoelectric accelerometer Methods for Verification of Vibration Displacement Sensors JJG644-2003 JJG676-2000 working vibrometer verification procedures Dynamic Signal Analyzers JJG834-2006 Evaluation and Representation of Measurement Uncertainty JJF 1059.1-2012 For dated references, only the dated edition applies to this specification; references that are not dated , The latest version (including all modifications) applies to this specification.

3 terms and definitions

3.1 balance efficiency balanceefficiency The ratio of the amount of change in vibration to the initial vibration after a balance test. Expressed by equation (1). η = V0-V1 V0 × 100% (1) Where. V0 --- initial vibration of the rotor; V1 --- the amount of residual vibration of the rotor after a balanced test.

4 Overview

Balancing instrument is composed of a phase detector, a number of vibration sensors and the host, is used to measure and analyze the rotating machine The analysis of the size and orientation of the unbalanced rotor. It is mainly used in industrial field, calibration has been installed on the machine Rotor field balance. The principle of measuring the balance is shown in Fig. Figure 1 Schematic diagram of the balancing instrument

5 measurement characteristics

5.1 Sensor reference sensitivity The reference sensitivity is the sensor sensitivity calibrated at the reference frequency point, and the calibration uncertainty is 3% (k = 2). 5.2 amplitude-frequency characteristics The amplitude and frequency characteristics of the balancing instrument should meet the requirement of ± 5%. 5.3 amplitude linearity The amplitude linearity of the balancer should meet the requirement of ± 5%. 5.4 phase frequency characteristics The phase balance of the dynamic balancer should be given. 5.5 Phase linearity The linearity of the balancer phase should meet the requirement of ± 2%. 5.6 channel consistency The balance between any two channels of the balancing instrument shall be consistent with the provisions of Table 1. Table 1 Channel Consistency Amplitude ratio/dB ± 0.1 Phase difference/(°) ± 1 5.7 speed Balancing instrument speed measurement accuracy level above 1.5. 5.8 Balanced efficiency After the balance, the initial unbalance should be reduced by more than 60%. Note. The above indicators are not used for qualifying, for reference only.

6 calibration conditions

6.1 Environmental conditions Ambient temperature. 23 ℃ ± 5 ℃; Relative humidity. ≤ 80%; The change in supply voltage should be within ± 10% of the rated voltage. Laboratory and its surrounding environment should be no vibration and shock source, no strong electric field, strong magnetic field, strong sound field interference. 6.2 Standard equipment for calibration and other equipment 6.2.1 Vibration standard device The vibration standard device for calibrating the balancing instrument includes the absolute vibration standard device and the comparative vibration standard device. Vibration standard device technical indicators in Table 2. Table 2 vibration standard device technical indicators Name measurement range Measurement uncertainty (k = 2) Frequency range/Hz Urel /% Uφ/(°) Absolute vibration Standard device f. 1Hz ~ 400Hz a. 0.1 m/s2 to 100 m/s2 φ. 0 ° to 360 ° 1 ~ 400 1 1 Comparison of vibration Standard device f. 10Hz ~ 400Hz a. 0.1 m/s2 to 100 m/s2 φ. 0 ° to 360 ° 10 ~ 400 3 2 6.2.2 phase shifter Phase shifter phase shift range of 0 ° ~ 360 °, phase shift resolution is better than 0.2 °, phase shift drift less than ± 0.2 °/h, work The frequency band is 1Hz ~ 1kHz. 6.2.3 Dynamic signal analyzer Dynamic signal analyzer selection of A-level. 6.2.4 Single disc rotor test stand The speed of the single disc rotor test stand is.200r/min ~ 3100r/min. Excellent stability within 1min speed At 0.1%. 6.2.5 Speed standard device Speed standard device accuracy level should be higher than the school object accuracy level 2 to 3 times. 6.2.6 Sinusoidal signal generator The distortion is not more than 0.03%, the frequency stability is better than 0.05%, the stability within 8h is better than 1%.

7 Calibration items and calibration methods

7.1 Calibration items Balancing instrument calibration items in Table 3. The actual calibration items should be based on the balancing instrument parameters and customer requirements. Table 3 Dynamic Balancer Calibration Project Serial number calibration item

1 visual inspection

2 reference sensitivity

3 amplitude frequency response

4 amplitude linearity

5 phase calibration

6 channel consistency

7 speed

8 balance efficiency

7.2 Calibration method 7.2.1 appearance inspection and power supply The knob should be flexible, the switch jumping clear, accurate positioning. The output input socket should not be loose. No effect normal Work of mechanical damage. According to the instructions to the balancer power, warm-up time should be more than 15min. 7.2.2 Reference sensitivity You can use the absolute and comparative methods to calibrate the dynamic balance reference sensitivity. The balancing device is equipped with a displacement sensor, a speed sensor, an acceleration sensor, according to the corresponding transmission Sensors supporting the calibration of the balance of the reference sensitivity, generally using 40Hz as a calibration point for low speed balance Dynamic balancer can be used as a calibration point 8Hz. 7.2.3 Amplitude frequency response Install the sensor to the vibration standard device, the vibration standard device gives a fixed vibration amplitude, change the frequency, measured The amount of the instrument at different frequencies is checked. In the school instrument operating frequency range to 1/3 octave frequency sequence selection Take no less than 7 frequency points for calibration, frequency response relative error can be calculated according to formula (2), the measurement results should be full The requirements of Rule 5.2. The amplitude frequency response calibration block diagram is shown in Fig. δf = xi-xr xr x 100% (2) Where. xi --- school equipment show value; xr --- by the school instrument reference frequency point of the indication. Figure 2 Schematic diagram of amplitude frequency response calibration Note. When using absolute calibration, there is no need to install a standard sensor. 7.2.4 amplitude linearity Select the sensitivity calibration frequency point, by the vibration standard device gives 7 ~ 10 evenly distributed vibration amplitude, respectively Measure the value of the calibrated instrument at different amplitudes, the amplitude linearity can be calculated according to formula (3) relative error, measurement The results shall meet the requirements of 5.3 of this specification. δL = xi-xs xs x 100% (3) Where. xi --- school equipment show value; xs --- gives the standard value. 7.2.5 Phase calibration There are comparative and absolute methods for phase calibration of dynamic balancers. 7.2.5.1 Comparison method of comparison and absolute law phase calibration a) When calibrating with the comparison method, the standard acceleration sensor and the sensor of the tested balancer should be "back to back" Rigidly mounted in the center of the table of the shaking table, so that the standard accelerometer and the test sensor to bear the same vibration. The signal output by the signal generator, one input power amplifier drives the standard shaker, the other way through the phase shifter In addition to the phase detector and the dynamic signal analyzer CH2, the standard accelerometer output signal is passed through the adapter Input dynamic signal analyzer CH1. The comparison method is shown in Fig. Figure 3 Comparison of phase diagram of phase comparison b) When calibrating with absolute law, the sensor of the instrument to be tested is rigidly mounted on the center of the table Set. By the signal generator output signal, all the way through the power amplifier drive standard shaker, the other way through the phase shifter Input phase equalization channel and laser amplitude frequency frequency frequency measurement system. Absolute law phase calibration block diagram shown in Figure 4. Figure 4 Block diagram of absolute method phase calibration 7.2.5.2 Phase frequency characteristics The phase shifter gives a fixed phase difference (0 ° ~ 360 °), within the operating frequency range of the calibrated instrument, The octave frequency sequence is selected to be at least seven frequency points, using the calibration method of 7.2.5.1 of this specification. The phase difference between the phase signal input signal and the vibration signal channel input signal is φ'i (i = 1, 2, , n). Comparing with the difference measured by the standard measuring device φ'i (i = 1, 2,, n), the calibrator Phase frequency characteristics of the results, in the comparison method, φi for the dynamic signal analyzer CH1 and CH2 in the input signal transmission The phase of the transfer function and the phase shift of the standard accelerometer set at this frequency point; in the absolute law, φi is the laser The phase difference measurement system measures the difference between the two input signals. The phase shift Δφ of the calibrator can be expressed by equation (4) Calculate. Δφ = φ'i-φi (4) 7.2.5.3 Phase linearity Select a reference frequency point within the operating frequency range of the balancer, given by the phase shifter at this frequency point 7 to 10 evenly distributed differences, using the calibration method of 7.2.5.1 of this specification were measured in different phase difference settings , The phase difference between the input signal of the balancing device and the input signal of the vibration signal channel φ'i (i = 1, 2, n), φ0 is the maximum difference measured by the dynamic balancer. In the comparison method, φi (i = 1,2, n) is a dynamic signal The difference between the input signals in the analyzers CH1 and CH2; in the absolute law, φi (i = 1,2, n) is the laser Frequency phase frequency measurement system to measure the difference between the two input signals, negative phase difference are converted to 0 ° ~ 360 ° said. Can be public Equation (5) to (7) calculate the phase linearity of the calibrated instrument, and the measurement results should meet the requirements of this specification. εi = φ 'i- (b kφi) φ0 × 100% (5) b = i = 1 φ'iΣ i = 1 φ2i- i = 1 φiΣ i = 1 φiφ'i i = 1 φ2i-n (1nΣ i = 1 φi) 2 (6) k = i = 1 φiφ'i- i = 1 φiΣ i = 1 φ'i i = 1 φ2i-n (1nΣ i = 1 φi) 2 (7) Where. b - fit the intercept of the straight line with the Y axis; k - the slope of the fitting straight line. 7.2.6 Channel Consistency The calibration principle of the channel consistency calibration of the balancing instrument is shown in Fig. Figure 5 channel consistency calibration measurement schematics In the dynamic balance of the operating frequency range to 1/3 octave frequency sequence selection of 5 to 7 frequency points. Adjust the signal Generator, the output of the appropriate amplitude of the sinusoidal signal, select a reference channel, measured at each frequency point under the other channel And the output amplitude ratio of the reference channel and the phase difference, the amplitude ratio is calculated according to the formula (8), the result should meet the specification 5.6 The request. εi = 20lg Ai A0 (8) Where. A0 --- reference channel to measure the amplitude; Ai - the measured amplitude of channel i. The phase difference φi0 between the channels is calculated according to equation (9) and the result shall meet the requirements of 5.6 of this specification. φi0 = φi-φ0 (9) Where. φ0 --- the phase difference measured by the reference channel, (°); φi --- the phase difference measured by channel i, (°). 7.2.7 speed In the school speed range of commonly used within the uniform selection of five test points (including the lower limit and the upper limit), the first turn Speed standard device transferred to the corresponding speed value, and then use the instrument to be measured to read the speed display, each calibration point are Should be checked 3 times. The measurement results shall meet the requirements of regulation 5.7. 7.2.8 Balance efficiency 7.2.8.1 Preparation Add an unbalanced block to the rotor of the rotor test bench, the quality of the unbalanced block in the safety range of the test bench , The rotor test bed in the range of 1000r/min ~ 3000r/min, can produce 15μm ~ 30μm vibration Is appropriate The dynamic balancer is installed and set up according to the experimental requirements of the influence coefficient method. 7.2.8.2 Experiment The rotor test bed speed to 1000r/min ~ 3000r/min between a certain speed, the record at this time turn The initial vibration of the test bench V0; adjust the speed to zero, in the circumference of the imbalance block, plus a suitable quality The mass of the mass, and record the quality; again the rotor test bed to open with the initial vibration recorded at the same speed, Record the vibration of the rotor test bed at this time; the rotor test stand shuts off the rotor to zero, according to the dynamic balance instrument should be given the quality And the phase, the counterweight is added to the corresponding position of the rotor of the rotor test bed; the rotor test stand is opened again with the recording Vibration at the same speed, record the rotor test bed at this time the vibration V1, balancing efficiency of the balance in accordance with the public (10), the result shall meet the requirements of regulation 5.8. η = V0-V1 V0 × 100% (10)

8 Calibration results are expressed

8.1 Calibration records The format of the recommended calibration record is given in Appendix A. 8.2 Calibration Certificate Calibration certificate issued by calibrated instrument. The calibration certificate should include the information and the recommended calibration certificate in the page format See Appendix B. 8.3 Uncertainty of calibration results Verification of calibration results for dynamic baluns Based on JJF 1059.1-2012, examples of uncertainty assessment Record C. 9 re-school time interval The re-calibration interval of the balancing instrument is recommended for one year. The re-school time interval is subject to the use of the instrument, the user and the instrument The properties of the device itself and many other factors. School units can be determined according to the actual situation of the complex time interval.

Appendix A

Calibrate the original recording recommended format On-site dynamic balance measurement analyzer calibration records Page Total page year month day Send school units, factories Model number, factory number, calibration certificate number Standard name, standard model, standard number Standard Certificate Number, Standard Certificate Date of validity Ambient temperature ℃, relative humidity%, based on the technical documents

1 appearance

2 reference sensitivity

Frequency at Hz, the scene dynamic balance measurement analyzer sensitivity.

3 frequency characteristics

Reference point indication xr Frequency/Hz The school instrument shows xi Relative error δf /%

4 amplitude linearity error

Frequency/Hz Standard indication xs The school instrument shows xi Relative error δL /%

5 phase frequency characteristics

Frequency/Hz Standard phase difference φi The instrument phase difference φ'i Phase shift Δφ

6 phase linearity

Frequency/Hz Standard phase φi Standard phase difference φi-φ0 The school instrument phase φ'i The phase difference between the calibrated instrument (φ'i-φ'0) Phase linearity εi

7 channel consistency

aisle Amplitude ratio/dB Phase difference/(°)

8 speed calibration

Standard speed/(r/min) Display speed/(r/min) Balance efficiency Balance speed. Rotor initial vibration. Try to add quality and angle. The balancer instructions should be added to the quality and angle. After a balanced vibration. Balance efficiency. 10 Calibration results Uncertainty. Calibrator

Appendix B

Calibrate the contents of the certificate B.1 Calibration certificate shall include at least the following information. a) title, such as "calibration certificate"; b) the number of the certificate, the page number and the total number of pages; c) the name and address of the calibration laboratory; d) the date of the calibration; e) where the calibration is performed (if not calibrated in the laboratory); f) the name and address of the customer; g) Model, specification and factory number of the calibrated measurement analyzer; h) the name and code of the technical specification; i) a description of the traceability and validity of the measurement standards used for this calibration; j) description of the calibration environment; k) Calibration results and their measurement uncertainty; l) the signature, job or equivalent mark of the certificate issuer, and the date of issue; m) The result of the calibration is valid only for the school object; n) No part of the reproduction of the certificate without the written approval of the laboratory. B.2 Recommended on-site dynamic balance The analyzer calibration format is shown in Table B.1. Table B.1 Recommended format for calibrating pages within the certificate Calibration results page

1 appearance

2 reference sensitivity

Frequency at Hz, the field dynamic balance measurement analyzer sensor sensitivity settings.

3 frequency characteristics

Reference point indication xr Frequency/Hz The school instrument shows xi Relative error δf /%

4 amplitude linearity error

Frequency/Hz Standard indication xs The school instrument shows xi Relative error δL /%

5 phase frequency characteristics

Standard phase difference φi Frequency/Hz The instrument phase difference φ'i Phase shift Δφ

6 phase linearity

Frequency/Hz Input phase difference φi Output phase difference φ'i Phase linearity εi

7 channel consistency

aisle Amplitude ratio/dB Phase difference/(°) Calibration results page

8 speed calibration

Standard speed/(r/min) Display speed/(r/min) 9 Balance efficiency. 10 Calibration results Uncertainty. Appendix C. Example of uncertainty assessment C.1 Introduction This appendix takes the measurement uncertainty of the comparative phase calibration project as an example, illustrating the dynamic balance measurement analyzer Quasi - item of measurement uncertainty. C.2 Evaluation of measurement uncertainty of phase calibration results C.2.1 Measurement model The dynamic balance measurement analyzer phase shift is measured by the dynamic balance meter measured by the phase channel and the vibration signal channel input signal Phase difference φ'i relative to the standard measurement system measured phase difference φi phase shift Δφ, calculated using the formula (C.1). Δφ = φ'i-φi (C.1) C.2.2 Class A assessment of standard uncertainty Class A uncertainty is mainly derived from the repeatabil...

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