GB/T 11348.3-1999 Measurement and evaluation of radial vibration of rotating shafts of rotating machinery Part 3: Coupled industrial machines
Some standard content:
ICS:7.160
National Standard of the People's Republic of China
GB/T 11348. 3—1999
eqx IS0 7919-3:1996www.bzxz.net
Mechanical vibration of non-reciprocating machines--Measurements on rotating shafts and evaluation criterinPari 3,Coupled industrial machinesPublished on April 8, 1999
Implemented on September 1, 1999
Published by the National Quality and Technical Supervision Office
GH/T 113-8.3—1599
This standard is the third part of the series of standards on measurement and evaluation of radial vibration of rotating machines. This series of standards is generally referred to as "the design and construction of special rotary machines for the measurement of mechanical properties of rotary machines", and consists of the following parts: Part 1: General Principles Part 2: Land-mounted turbine generators Part 3: Industrial machines for land-mounted installations Part 4: Gas turbine units Part 5: Hydropower and power station units This standard is equivalent to the international standard JS7919-3 - Criteria for the measurement and evaluation of rotary machines for rotary machines Part 3: Criteria for the measurement and evaluation of mechanical properties of rotary machines for use in combination with industrial machines Part 3. This standard is consistent with the international standard JS7919-9-3. For the convenience of use and in accordance with my country's national conditions, this standard provides some interpretations and explanations on the basis of IS71%-3. For example: the base value or value is clearly defined. The provisions of the alarm limit value of this standard are completely consistent with 17319-3. For the setting of the base value + B/zone boundary lower 25% of the B zone boundary value, the smaller value is taken. For the change relative to the benzene line value exceeding 25% of the B/zone boundary specified in this standard, an alarm is issued. In the arrangement of this standard, the ISO:19-3 is marked and recorded in the text.
This standard is not proposed by the Xijia Machinery Industry. This standard is under the jurisdiction of the National Mechanical and Electrical Standardization Technical Committee: This standard was established by: Hangzhou Second Industry Automobile Yan Research Institute, Zhengzhou Machinery Research Institute, Shenyang Institute of Drum Steel Machinery Research Institute. Jie Zhishuang saw the section: Quanwenwang, Zhu Yuanjiang, Chen Wei, and Guangyou Baozi. GB/T11348.31999
ISO Foreword
5 International Standardization Organization (International Federation of Standardization Organizations) The work of formulating international standards is generally completed by the technical committees of the relevant departments. Each member body expresses its interest in the standards established by its technical committee and participates in the work of the committee. International organizations (exclusive or non-exclusive) that maintain contact with IS may also participate in the relevant work. The International Electrotechnical Commission (EC) maintains close cooperation with the International Electrotechnical Commission (IEC). The international standard draft formally adopted by the technical committee is approved by the International Standard Committee as an international standard. It is subject to communication and planning decisions. According to the IS procedure, international standards can only be formally adopted with the approval of the relevant body at least 75% of the time. The international standard IS0919-3 was developed by the International Organization for Standardization JS/TC108 Mechanical Shock and Impact Technical Committee 2 (Measurement and evaluation of radial vibration of rotating machinery, vehicles and equipment). The general title of IS0919-3 is "Measurement and evaluation of radial vibration of rotating machinery shafts" and it consists of the following parts: Part 1: General
Part 2: Large steam turbine generator sets for land use
Part 3: Components of turbine generator sets for land use
Part 4: Gas-fired units
Part 5: Components of motor units and pump units
Scope
National Standard of the People's Republic of China
Measurement and evaluation of radial vibration of rotating machinery shafts Part 3: Coupled industrial machines
Mexlnnicat vlbratian at nnn-reciprocating machinesMeasurements on rotating shafts and evaluation criteria.-Pnrt 3;Cauplet industrial machinesGB/I11348.31999
eq50 7919-3.1996
This standard specifies the standard for the radial vibration of rotating shafts and the ... Industrial machinery for dynamic bearings includes: steam turbines, turbo compressors, steam turbine generator sets, filter systems, turbo fans, electric drive devices and coupled gear transmission devices. The size and power of the machine are not limited.
This standard is not applicable to steam turbine generator sets with an output power of more than 50MW, but also suitable for the measurement and evaluation of the shaft dynamics of permanent turbines and systems with an output power greater than or equal to 1MW. 2 Reference standards
The following standards contain the texts that are called in this standard and constitute the provisions of this standard. When this standard is in use, the versions shown are valid. All standards will be revised, and all parties to this standard should use the latest version of the following standards when exploring performance. GB/T1-317-1989 Large rotating machinery vibration intensity assessment on-site G111343.1-1999 Rotating machine radial vibration measurement and assessment Part 3: General provisions
This standard defines the following:
The value of the line is lbe.aelintvalne:
Hang lift in steady state operation, the right representative of the clothing, called the normal full disassembly of the machine during normal operation of the system juice average surface.
Application Note
[S1-3 This standard is slightly different from the definition of low efficiency single extraction. Home Quality and Technical Supervision Brush 19990408 Approved 1999-09 01 Implementation
4 Measurement method
CB/T11348.31999
4-The measurement method used shall comply with the requirements of H/11348.1. 4.2 Industrial machines measure the vibration of the shaft relative to the bearing seat through the band. Unless otherwise specified, the reported measurement values in this standard refer to the relative vibration position.
4.3 Since the rotation frequency of industrial machines is often measured by non-contact sensors. 4.4 For monitoring, the frequency band of the measuring system should be sufficiently wide, and the upper frequency limit of the band should be 2.5 times the operating speed. 5.1 General 5.1.1 The vibration of an industrial machine at or near a bearing is determined using the following two criteria: Criterion T: The vibration amplitude is the relative amplitude of the vibration, regardless of whether it increases or decreases. 5.1-2 The vibration amplitude to be evaluated is the greater of the peak displacements measured between two perpendicular measuring planes of the rotating shaft at or near a bearing. When only one measurement direction is used, the points must be guaranteed to provide sufficient information. 5.1.3 This criterion is the same as 1. The evaluation of the vibration of the shaft of the industrial machine during steady-state operation or slow changes in the rated speed and load range does not apply to its operating conditions or changes in development, such as starting, aging and when passing through its load range. 5.1.4 It should be noted that the evaluation of the overall mechanical disassembly state is based on the evaluation of the vibration of the bearing and the bearing. The vibration evaluation of the frame and the seat is B11≤47 as specified: 5.2 The limit value of the vibration amplitude of the shaft under rated speed and load shall be consistent with the bearing's operating torque, the radial distance between the bearing and the shaft, and the permissible vibration transmission rate to the supporting structure and foundation: 5.2.2. The maximum vibration amplitude of each bearing is compared with the four evaluation areas established in the following areas to determine the quality of the shaft resistance of the protector, and provide a guide for possible measures: Area A: The shaft return value of the newly delivered machine is usually in this area; Area B: The shaft vibration amplitude of the dismantled machine is considered qualified in this area and can be operated for a long time; Area C: The machine with a slight vibration amplitude in this area is generally considered unsuitable for long-term operation. Before taking corrective measures, the machine can run in this state for a limited period of time. Knife area: The shaft movement resistance of the machine in this area is often changed to a dangerous level. The severity of the movement is high enough to reduce the damage to the machine. 5.2.3 Evaluation of the shaft movement limit in this area
According to the measurement of the shaft operation in some areas, the recommended value is inversely proportional to the square root of the shaft speed. Figure 1 shows the relationship between the speed of the industrial machine shaft and the dynamic displacement limit. 2
Additive code #
GB/T 11348.3—1999
Shaft movement limit (lt·nin-!)
Figure 1 shows the relationship between the speed of the industrial machine shaft and the dynamic displacement limit. The relationship between speed and dynamic displacement is calculated according to the standard in China: A/B zone boundary
B/G zone boundary
) zone boundary
Where: San-
The peak value of the vibration displacement of the rotating shaft is selected, see (G/T11348.1)te
5.2.4 This standard will use the moving limit as the acceptance or standard point of the machine to obtain the consent of the manufacturer and the user, and specify it in the ordering process. This limit is to ensure that the order is not too large or the requirements are not met. In some cases, for example, when the machine uses a bearing with a bearing, it may be necessary to use different zone limit values. In the case of the original shaft, in the large and small bearing clearance directions, the actual resistance value may be different. The moving limit pin is related to the journal diameter. · Generally speaking, the running problem of bearings with larger diameters is relatively large. Therefore, the operating limits can be different when measuring the vibration of the shaft at the auxiliary bearings that are not in the same diameter as the shaft system. The operator should explain the reason for this and ensure that the machine or components will not be damaged when the larger vibration limit is used.
GR/T 11348.3-1999
5.2.5 If the measuring point is not on the shaft, the door can be operated at other locations without a sleeve. Under certain circumstances, such as starting and stopping (including passing through the critical switching zone), a larger vibration limit value can be used. 5.3 Accurate measurement of the change in the dynamic value
53-1 Under normal operation, the standard dynamic value shall be evaluated based on the change of the baseline value specified in advance. The obvious change in the dynamic amplitude of the shaft may be a rate-dependent or gradual development at any time. It must indicate that the machine is damaged, or there are signs and warnings of small changes in rigidity. 5.3.2 If the dynamic amplitude changes significantly, and its change relative to the baseline exceeds 2 degrees of the zone boundary, whether it increases or decreases, the cause of the change should be found out. The specification should take measures to consider the maximum dynamic details and the machine should only contain the stable break under the new conditions.
5.3.3 When using the standard, it is necessary to compare the vibration scenes under similar working conditions at the same receiver position and time.
5.3.4 It should be noted that the standard also considers the change of the standard dynamic constant, which is limited because the vibration value under certain conditions is sufficient to produce a certain efficiency component, which may not be sensitive to the vibration compensation signal of the shaft in the study frequency band. For example, the expansion of the crack may cause changes in the rotation frequency of many dynamic components, but their amplitudes may be very small compared with the values of the rotation rate components before the track is rejected. Therefore, it may be difficult to identify the effect of crack expansion by only paying attention to the changes in the frequency band vibration. In some cases, it may be necessary to carry out a frequency analysis to determine the safety trends of the various components in the dynamic supply code. This work has been included in this standard. 6 Shaft vibration limits during operation
6-1 For small or low-power machines, continuous monitoring of the vibration is not necessary. However, for machines that have been continuously monitored, the vibration limits during normal operation can be determined. These limits take the form of noise and vibration. 6.1.1 It is very important that when the vibration reaches a specified value, a significant change occurs. In this case, it may be necessary to take compensatory measures. If necessary, the machine can continue to run for a period of time and conduct research to identify the cause of the vibration change and determine the corrective action.
62: If the specified alarm value is exceeded and the machine is running normally, the machine may go out of range. If the value is exceeded, the machine may stop or stop.
6.1.3 For different measuring positions and measuring directions, the dynamic load and support intensity reflected are different, and the basic value and the actual value during operation may be different.
6-2 Alarm setting
6.2.1 The size of the alarm value of different machines may vary greatly, and the alarm is usually set based on the baseline value. 6.2.2 Alarm value a) 25% of the baseline detection value of the B zone boundary value, and the smaller value of the B zone detection value relative to the B/C zone boundary value. E.2.3 Where a baseline value has been established, for example, a new machine, the initial alarm value is set based on the experience of other similar machines or within a narrow range of acceptable values. After a period of operation, a stable value is established, and then the alarm value is adjusted accordingly. 6.2.4 When the stable value changes (for example, after the machine is recorded ) The setting of the warning value can be modified accordingly. For different bearings on the unit, due to different dynamic loads and bearing support stiffness, the setting of the replacement value can also be different. E.3 The determination of the interval
6.3.1 The penalty value is related to the machine parts and depends on the design of the dynamic load of the machine: gear ratio. For all similar units, the system values used are the same and generally have nothing to do with the baseline when setting the back parts. The system is based on GB/T 119-3. For the modification of the baseline and the setting of the alarm value, GB/T 11348.3-1999
6.3.2 Usually the penalty value is set within the C area: for machines with different working ratios, the penalty values may be different. This standard cannot clearly stipulate the corresponding interval values.3 When using the T standard, only the vibration scenes under similar conditions at the same receiver position and time must be compared.
5.3.4 It should be noted that the standard also considers the change of the standard vibration constant, which is limited because the vibration value under certain conditions is usually a change in the efficiency component of the design, and it is not necessarily sensitive to the vibration compensation signal of the shaft in the study frequency band. For example, the expansion of the crack may cause changes in the rotation frequency of the multiple dynamic components, but their amplitudes may be very small compared to the values of the rotation rate components before the track is rejected. Therefore, it may be difficult to identify the effect of crack expansion by only paying attention to the changes in the vibration of the frequency band. In some cases, it may be necessary to carry out a frequency analysis to determine the safety trends of the various components in the dynamic supply code. This work has been included in this standard. 6 Shaft vibration limits during operation
6-1 For small or low-power machines, continuous monitoring of the vibration is not necessary. However, for machines that have been continuously monitored, the vibration limits during normal operation can be determined. These limits take the form of noise and vibration. 6.1.1 It is very important that when the vibration reaches a specified value, a significant change occurs. In this case, it may be necessary to take compensatory measures. If necessary, the machine can continue to run for a period of time and conduct research to identify the cause of the vibration change and determine the corrective action.
62: If the specified alarm value is exceeded and the machine is running normally, the machine may go out of range. If the value is exceeded, the machine may stop or stop.
6.1.3 For different measuring positions and measuring directions, the dynamic load and support intensity reflected are different, and the basic value and the actual value during operation may be different.
6-2 Alarm setting
6.2.1 The size of the alarm value of different machines may vary greatly, and the alarm is usually set based on the baseline value. 6.2.2 Alarm value a) 25% of the baseline detection value of the B zone boundary value, and the smaller value of the B zone detection value relative to the B/C zone boundary value. E.2.3 Where a baseline value has been established, for example, a new machine, the initial alarm value is set based on the experience of other similar machines or within a narrow range of acceptable values. After a period of operation, a stable value is established, and then the alarm value is adjusted accordingly. 6.2.4 When the stable value changes (for example, after the machine is recorded ) The setting of the warning value can be modified accordingly. For different bearings on the unit, due to different dynamic loads and bearing support stiffness, the setting of the replacement value can also be different. E.3 The determination of the interval
6.3.1 The penalty value is related to the machine parts and depends on the design of the dynamic load of the machine: gear ratio. For all similar units, the system values used are the same and generally have nothing to do with the baseline when setting the back parts. The system is based on GB/T 119-3. For the modification of the baseline and the setting of the alarm value, GB/T 11348.3-1999
6.3.2 Usually the penalty value is set within the C area: for machines with different working ratios, the penalty values may be different. This standard cannot clearly stipulate the corresponding interval values.3 When using the T standard, only the vibration scenes under similar conditions at the same receiver position and time must be compared.
5.3.4 It should be noted that the standard also considers the change of the standard vibration constant, which is limited because the vibration value under certain conditions is usually a change in the efficiency component of the design, and it is not necessarily sensitive to the vibration compensation signal of the shaft in the study frequency band. For example, the expansion of the crack may cause changes in the rotation frequency of the multiple dynamic components, but their amplitudes may be very small compared to the values of the rotation rate components before the track is rejected. Therefore, it may be difficult to identify the effect of crack expansion by only paying attention to the changes in the vibration of the frequency band. In some cases, it may be necessary to carry out a frequency analysis to determine the safety trends of the various components in the dynamic supply code. This work has been included in this standard. 6 Shaft vibration limits during operation
6-1 For small or low-power machines, continuous monitoring of the vibration is not necessary. However, for machines that have been continuously monitored, the vibration limits during normal operation can be determined. These limits take the form of noise and vibration. 6.1.1 It is very important that when the vibration reaches a specified value, a significant change occurs. In this case, it may be necessary to take compensatory measures. If necessary, the machine can continue to run for a period of time and conduct research to identify the cause of the vibration change and determine the corrective action.
62: If the specified alarm value is exceeded and the machine is running normally, the machine may go out of range. If the value is exceeded, the machine may stop or stop.
6.1.3 For different measuring positions and measuring directions, the dynamic load and support intensity reflected are different, and the basic value and the actual value during operation may be different.
6-2 Alarm setting
6.2.1 The size of the alarm value of different machines may vary greatly, and the alarm is usually set based on the baseline value. 6.2.2 Alarm value a) 25% of the baseline detection value of the B zone boundary value, and the smaller value of the B zone detection value relative to the B/C zone boundary value. E.2.3 Where a baseline value has been established, for example, a new machine, the initial alarm value is set based on the experience of other similar machines or within a narrow range of acceptable values. After a period of operation, a stable value is established, and then the alarm value is adjusted accordingly. 6.2.4 When the stable value changes (for example, after the machine is recorded ) The setting of the warning value can be modified accordingly. For different bearings on the unit, due to different dynamic loads and bearing support stiffness, the setting of the replacement value can also be different. E.3 The determination of the interval
6.3.1 The penalty value is related to the machine parts and depends on the design of the dynamic load of the machine: gear ratio. For all similar units, the system values used are the same and generally have nothing to do with the baseline when setting the back parts. The system is based on GB/T 119-3. For the modification of the baseline and the setting of the alarm value, GB/T 11348.3-1999
6.3.2 Usually the penalty value is set within the C area: for machines with different working ratios, the penalty values may be different. This standard cannot clearly stipulate the corresponding interval values.
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