JB/T 8107-1999 The national standard GB 7773-87 "Measurement Method for Vibration of Positive Displacement Vacuum Pumps" was adjusted to the industry standard JB/T 8107-95 "Measurement Method for Vibration of Positive Displacement Vacuum Pumps" in 1995. This standard is a revision of it. Only editorial changes were made during the revision, and the main technical content remained unchanged. This standard is not equivalent to the international standard ISO 2372:1974 "Vibration of machines with a speed of 10 to 200s-1 - Basis for specifying evaluation standards." This standard specifies the measurement method for vibration of vacuum positive displacement pumps. This standard is applicable to the mechanical vibration measurement of positive displacement vacuum pumps with an ultimate pressure of less than 100Pa and that can be directly exhausted to the atmosphere. JB/T 8107-1999 Vibration measurement method for positive displacement vacuum pumps JB/T8107-1999 Standard download decompression password: www.bzxz.net

[CS23.160
Mechanical Industry Standard of the People's Republic of China
JB/T8107-1999
neg1So2372:1974
Positive Displacement Vacuum Pump
Vibration Measurement Method
Methods of measurement for mechanical vibration of positive-displement vacuum pumps1999-07-12Published
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T 8107-[9
National Standard GB7773—87 Variable Volume Re-Empty Bar Vibration Measurement Disc Force Method" was adjusted to the industry standard JB.T8107—95% Variable Displacement Vacuum Pump Vibration Measurement Mother Force Method" in 1995. This standard is a revision of it. During the revision, the original standard was modified, but the following seven points remained unchanged: This standard adopts the international standard ISQ2372:1974 (Mechanical vibration of machines with a speed of 10 to 200 s* - Basis for specifying evaluation criteria) in a non-equivalent manner. The standard is based on the international standard ISQ2372:1974 (Mechanical vibration of machines with a speed of 10 to 200 s* - Basis for specifying evaluation criteria). Appendix A of this standard is a reminder appendix. This standard was produced and managed by the National Technical Committee for Standardization of Vacuum Technology. The drafting unit of this standard is Shenyang Vacuum Technology Research Institute. The authors of this standard are Qian Yuying and Li Chunying. The standard was first issued in 1987. [Scope] Machinery Industry Standard of the People's Republic of China Methods of measurement for vibration of positive displacement vacuum pumps Methods of measurement for vibration of positive displacement vacuum pumps Mechanical Vlbation of Pasltive-Displacement Measuring Methods for Vacuum Pumps This standard specifies the measurement method for the vibration of vacuum pumps. JB/T8107—1999
neq1SO2372:1974
Replacement [B/T8107-95
This standard is applicable to the mechanical vibration measurement of vacuum pumps (hereinafter referred to as vacuum pumps) with a limit pressure of less than 10 and capable of directly exhausting the air space
2 Reference standards
The provisions contained in the underlined standards are used in this standard to constitute the reference text of the standard. When the technical standard is published, the versions shown are valid: All standards will be considered, and the parties using this standard should explore the possibility of using the latest version of the following standards. JB/T7266—1994 Method for measuring the performance of vacuum pumps 3 The measured quantity
is mainly in the range of 2-1000Hz. The effective value of the vibration intensity is used to represent the vibration intensity. The effective value of the vibration intensity can be directly measured and displayed by the square detection compensation. The maximum value measured at the specified measuring point and downward represents the vibration intensity of the pump.
The vibration of the pump is not a single simple harmonic operation, but a periodic vibration or quasi-periodic vibration composed of several interharmonic vibrations of different frequencies. If the vibration period is a function of time/, the vibration speed is a function of time/: Vyi
The effective value of the vibration speed is:
When the vibration of the pump is composed of several simple spectrum vibrations of different frequencies (also 1, 2...inches), according to the frequency analysis, its value is 5, the acceleration amplitude is: The acceleration amplitude is calculated by formula (3):
, then the effective value of the vibration scale can be D2r+A+(
(sa ++A +易)
{呼+隆+A)
Note: The method of converting the amplitude of the vibration amplitude is shown in Table 4 (the most appropriate method) Approved by the Bureau of Machinery Industry [599-0-12
2000-01-01Implementation
4 Measuring instruments
3H/T8107—1999
The measuring instrument includes a sensor, an amplifier or an associated converter, a measuring instrument and a corresponding indicating recorder. The measuring instrument should be able to directly read the effective value of the vibration intensity. The frequency filter range of the measuring instrument is 2-1000Hz, and its frequency characteristics are in accordance with the characteristics shown in Figure 1. The accuracy is not less than ±10% of the indicated value. In the entire measuring frequency range, for the sensor with a certain type of excitation, its horizontal sensitivity is less than 10% of the main measuring force.
The use of the measuring instrument and the installation of the sensor shall comply with the requirements of the national regulations or the instrument instructions. The measuring instrument shall be inspected regularly by the metrology department. Before the measurement, the measuring instrument shall be calibrated. Ewww.bzxz.net
Test points for change of standard state
1.62534568401.621.5346161.622.33156E10
Figure 1 Sensitivity-frequency characteristics of vibration measuring system 5 Push measurement of the sliding purchase
5.1 Installation of the pump
The pump cover is placed on the flat cement floor of the test room, and the ground bolts are not screwed. Such installation does not generate additional vibration. 5.2 Working condition of the pump
The pump is not connected to the test cover and operates according to the test conditions specified in JBT7266. After the pump is stable, the vibration measurement is carried out. The bearing seat, exhaust port and oil tank of the main measuring points are the main measuring points, and the other measuring points are auxiliary measuring points. For each auxiliary point, the vibration measurement must be carried out in three mutually perpendicular directions. 6. Quantity report
The vibration measurement report should include:
a) specifications, model, performance parameters and manufacture of the pump; 2
b) measurement frequency, installation form of the detector:
IB/T107-1909
) specifications and model of the measuring instrument for inspection:) diagram of measuring points;
) vibration value and maximum vibration amplitude in each direction of each point (standardized data);
A
(standardized data);
effective value of vibration frequency and calculated displacement amplitude A1 In this standard, the effective value of velocity is used as the representation of the vibration, but in some cases, the displacement value of the main frequency in the vibration spectrum measured by the drawing is very important. In addition, some standards also use displacement control values ​​as a representation of vibration. Therefore, it is necessary to convert the effective value of the control velocity into the vibration displacement amplitude. Only a single-frequency positive wave can be converted from the effective value of the control velocity to the vibration displacement amplitude. Knowing the effective value of the velocity of the frequency, use formula (A1) to calculate the displacement amplitude:
Where: Displacement amplitude, mm:
V,-effective value of the vibration velocity with a vibration rate of f. mm/s: w,——angular velocity,,2#f.
A2 Example
It is known that the vibration intensity (effective value of velocity) is 4min/s, that is, in the frequency band of 2~1000Hz, the effective value of the vibration velocity does not exceed 4mm. Spectral analysis shows that when the frequency is 25Hz, its vibration intensity effective value is 2.8mms, and its displacement amplitude is: =v
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