JB/T 9759-1999 This standard is a revision of ZB J91 005-88 "Limits and measurement methods for torsional vibration of shaft systems of internal combustion generator sets". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the allowable limits and measurement methods for torsional vibration of shaft systems of internal combustion generator sets, and puts forward general requirements. Special requirements may be put forward for internal combustion generator sets for special purposes. This standard is applicable to the generator-level shaft systems of land-based fixed power stations or mobile power stations with reciprocating internal combustion engines with 3 or more cylinders as the driving machine. This standard was first issued in 1988. JB/T 9759-1999 Limits and measurement methods for torsional vibration of shaft systems of internal combustion generator sets JB/T9759-1999 Standard download decompression password: www.bzxz.net

[CS27.020
Machinery Industry Standard of the People's Republic of China
JB/T 9759-1999
Internal combustion engiae driven generating sets-Limits and measoring methods for torsional vibration of shaft system1999-09-17 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T 9759-1995
This standard is a revision of ZBJ9005.88 "Limits and measoring methods for torsional vibration of shaft system of internal combustion engiae driven generating sets". During the revision, the original standard was edited, and the main technical content remained unchanged. This standard shall be implemented from ZB.1915-88. The appendix A and appendix R of this standard are both reminder appendices. This standard is proposed and approved by the National Technical Committee for Standardization of Internal Combustion Engines. The unit that initiated this standard is Shanghai Internal Combustion Engine Research Institute. The main drafter of this standard is: Shanghai Internal Combustion Engine Research Institute.
This standard was first issued in 198B,
People's Republic of China Machinery Industry Standard
Internal camhnstinn enginedriven Rtnerating seis-Limits and measuring meihods for torsionnl vibration af shaft systems1 Scope
JE/E9759—1999
R19100:5—88
This standard specifies the general allowable limits and measuring methods for torsional vibration of shaft systems of internal combustion generator sets, and may put forward special requirements for internal combustion generator sets for special purposes.
This standard applies to the shafting of generator sets in fixed power stations or mobile stations with three or more standard internal combustion engines as the driving engine.
2 General
2.1 The unit includes the combination of the internal combustion engine and the generator. 2.2 The shafting refers to all the components related to the calculation of the torsional vibration and the transmission of power from the internal combustion engine to the generator set. 2.3 The shafting of the same type of internal combustion generator set shall be subjected to the calculation and measurement of the torsional vibration. If the calculation and measurement results are inconsistent, the actual results shall prevail.
Note: The shafting of the same type of internal combustion generator set refers to the shafting of the equivalent system unit + the shafting of the corresponding internal combustion generator set. 2.4 The unit transmission supplier shall be responsible for whether the torsional vibration characteristics of the shafting of the unit meet the requirements of this standard. The unit providing the unit's shaft system equipment must provide the unit supplier with the necessary technical information to facilitate the calculation and measurement of the unit's shaft system torque disassembly. 2.5 The unit supplier can be an internal combustion engine or generator manufacturer, or a contract contractor. If the buyer buys the internal combustion engine from one company and the generator from another company, then the supplier is the supplier of the unit. 3 Torsional vibration limit
3.1 Torsional vibration limit
3.1.1 The stress of the crankshaft of the internal combustion engine should not exceed the value specified in the table. 3.1.2 The torque of the drive shaft and the rotor should not exceed the limit specified in Table 2. 3.2 Torsional vibration amplitude limit
During continuous operation, the torsional vibration amplitude of the AC generator rotor should be within the range of ±2.5\/P*. $+
1) Including pulsation amplitude:
2) Generator weight,
State Administration of Machinery Industry 1999-09-J7 Approved 2000-01 -0L implementation
Operation category
Continuous operation
Instantaneous operation
Rate ratio
1 is the ratio of the rated speed of the operation
2 is the material strength.
JB/T9759-[999
Table! Crankshaft torsional stress limit
Reverse stress limitbzxz.net
Alloy
(aa430)
Table 2 Unit transmission, motor shaft torsional stress limit Operation category
Continuous operation
Instantaneous operation
3.3 Torsion short limit
Turning ratio
Torsion stress limit single basis Xie (2430)
3 3. 1 The vibration torque applied to the generator at the rotating part is less than 0.9s and when it is 0.95~1.10, it should be within ±6.M and ±2M, respectively.
Note: M is the average torque at the rated power. 3.3.2 If a gear transmission is provided in the shaft system, the vibration torque at the gear meshing point should generally not exceed M/3 when it is 0.95~1.10. 3.3.3 If an elastic coupling is provided in the shaft system, the vibration torque value transmitted by its elastic element should not exceed the limit of sustained rotation specified in the elastic coupling specification when it is 0.95-1.10. During instantaneous operation, it should not exceed the limit specified for instantaneous operation. 4 Torsional agitation measurement method
4.1 Scale
Based on the shaft The rotation center of the system is taken as the displacement, and the angular displacement of the measured point is taken as the measurement, and the unit is expressed in degrees or degrees. 4.2 Measuring instruments
4.3.1 The measuring instruments for measuring the torsion vibration of the shaft system must be calibrated by the testing unit approved by the national competent department and have a certificate of conformity.
4.2.2 The error limit of the straight part of the amplitude-frequency characteristic curve of the measuring instrument should be ±10% of the indicated value. The straight part of the amplitude-frequency characteristic curve should be suitable for the measured frequency range, otherwise the vibration measurement value should be corrected according to the pre-determined characteristics. 4.3 Measuring instrument installation
4.3.1 The installation accuracy of the measuring instrument should meet the requirements of the instrument manual. The connection between the sensor and the measured point should not significantly affect the original torsional vibration characteristics of the unit shaft system.
4.3.2 The measured point should be arranged at a place with large amplitude: generally at the end of the engine crankshaft. If necessary, additional measuring points can be added at the outer end of the generator shaft.
4.4 Preparation for measurement
4.4.1 Before measurement, the unit supplier shall provide: b) the inertia disc of each concentrated mass in the shaft system of the unit; c) the torsional stiffness C or flexibility e of each shaft section, the minimum diameter or minimum torsional section modulus B of the transmission shaft and the rotor shaft of the motor, and the system diagram [see Appendix A (suggestive appendix)]; b) the Holtzer table of the inherent frequency of all significant perturbations [see Appendix B (suggestive appendix)]. 4.7. Calibrate the measuring instrument system before or during measurement. 4.4.3 It is allowed to use filters during measurement, but it must be noted in the measurement report. 4.5 Test Procedure
4.5.1 The unit shall be subjected to torsional vibration measurement at no load within the speed range of stable speed and 110% rated speed. 4.5.1.1 If the measurement is carried out under the condition of continuous speed change, the measurement shall be carried out from low speed to high speed and then from high speed to low speed. The two measurement records shall ensure complete overlap. 4.5.1.2 If the measurement is carried out according to the speed distribution, the speed distribution within the distribution shall be less than 2% of the resonant speed. In each measurement condition, sufficient measurement time shall be ensured to provide a stable recording signal. 4.5.2 The unit shall also be subjected to torsional vibration measurement at rated speed, rated load and rated load. 4.6 Analysis of measurement records and measurement results
4.6 When analyzing the measurement records by manual method, a few typical frequency recording signals and the arithmetic average of their amplitudes shall be selected, and the analysis samples of the torsional vibration signals under typical working conditions shall be provided. When analyzing the measurement records by analog analysis method, the selection of analysis system should meet the requirements of the analysis frequency range. When analyzing, a filter with appropriate bandwidth should be selected. In order to ensure the analysis accuracy, sufficient analysis time should be provided, and the spectrum diagram of typical situation analysis should be provided. 4.6.3 When analyzing the measurement records by digital analysis method, the analysis frequency must fully meet the sampling theorem, and the spectrum diagram of typical situation analysis and the reproduced measurement signal should be provided.
4.4 Plot the analysis results of the above-mentioned measurement records to plot the main harmonic value A of the measuring point, and the curve of the change with the speed: Note: The main harmonic value refers to the relatively large value. 4.6.5 Determine the measured value of the vibration mode of the shaft system node according to 4.6.4. 4.6.6 When the shaft system is filled with large damping components, if the error between the measured natural frequency value and the theoretical calculated value is within the range of ±5%, the measured amplitude of the shaved point is allowed to be used to calculate the amplitude, stress and vibration torque of other parts of the system according to the blunt vibration model: otherwise, the original four shall be reported, and the calculation shall be corrected according to the measured natural frequency before calculation. 4.6.7 According to 4.6.6 Calculate the torsional force of each shaft system component or element, compare the dynamic torque with the corresponding allowable limit, and evaluate the working reliability of the unit shaft system. 4
Shaftless
Micro,
JB/T9755—1999
Appendix A
【Reminder of measurement】
Equivalent system diagram
35306x16
7.017×10
1.2316*10--
1.2116×10-
5.769x16-
1.8474×10r
2.2029×10
1.0071*10
kg :m2
.0.6992
kg*m/s
1.0948x16
9.1599:14
9.1599×1G
9.1599x164
9.7871-10
3.2417×10
「， is the torsion data or analysis of the vehicle.
2N is the state rotation rate, times mn:
3a is the sweep rotation rate, 155
JB /T9759-—1999
【Appendix】
Intrinsic rate (Holizer calculation table fefa
kg'm'y
1.094B×10F
8.7359x14
6.4980x10
8.1703×10
7.7504×10
-2.3775*10°
5,5671×10
1.1093 ×1Ds
1.0948×[0)
1.182110s
2.0551×105
3.7219×10
4.4970*100
1.2.527×10
9.5928*10
1.10 92×100
2-2.1532x202
N=206min
二hofayd
3.5306x 10-
7.0170×10*
1.2316×10*
12316-10
1.2316×10-1
5.70-69±10-t
1.R474×10-
2.2029×1m*||tt| |1.0071x10-1
2.5953x10:
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