This standard specifies the measurement and assessment criteria for radial vibration of the rotating shaft of gas turbine units. This standard applies to all gas turbine units (including gas turbine units with gearboxes) with sliding bearings, output power greater than 3MW, and rotating shaft speeds from 3000r/min to 30000r/min. This standard does not apply to gas turbines for aircraft engines, because the main difference between them and industrial gas turbines is that the bearing type (roller bearing), the stiffness and mass ratio of the rotor and the supporting structure are different. GB/T 11348.4-1999 Measurement and assessment of radial vibration of rotating shafts of rotating machinery Part 4: Gas turbine units GB/T11348.4-1999 Standard download decompression password: www.bzxz.net

1cS.17.160
National Standard of the People's Republic of China
GB/T11348.4—1999
eqv ISO 7919-4: 1996
Mechanical vibration of non-reciprocating machines-Measurements on rutating shafts and evaluation criterix-Part4:Gas turhine Sets
Published on April 8, 1999
Implementation on September 1, 1999
Published by the State Quality and Technical Supervision Commission
GB/T 11348. 4--1999wwW.bzxz.Net
This standard is the core part of the series of standards for measurement and evaluation of radial vibration of rotating machinery shafts. The general title of this series of standards is "Measurement and evaluation of radial vibration of rotating transmission", which consists of the following parts: Part 1 General Principles Part 2: Large steam turbine generator sets installed on the ground Part 3: Combined industrial machinery Part 4: Gas turbine units Part 5: Hydroelectric power plants and power station units This standard is equivalent to the international standard TS (719-4:1996 for the measurement and evaluation of mechanical vibration of reciprocating machines Part 4: Gas turbine units. This standard is similar to IS751≤-4:1996 in terms of main technical content, but for the convenience of use and in combination with the national conditions of China, this standard has made an explanatory explanation of some contents on the basis of 1S07919-4:1996. For example, this standard recommends the use of non-contact sensors, and the standard recommends The shaft vibration sensor is installed at 15 points on the vertical center of the upper half of the bearing. The level division, format and format of this standard are slightly different from 1S07919-4:1996. For example, Appendix A in the international standard has been added as the above article in this standard. In the measurement method, this standard adds explanations according to displacement, frequency phase and measurement point arrangement.
The current definition of vibration limit value in this standard is completely consistent with the estimated value of [S]79°9-4;1995. This standard is issued by the State Exploration and Development Commission of China.
This standard is drafted by the National Technical Committee of the State Exploration and Development Commission of China. This standard is drafted by the Beijing Gas Turbine Research Institute. The participating units are Nanjing Steam Turbine Electric Railway Factory and Beijing Refining Factory. The drafters of the municipal standard are Hu Zhixing, "Office, Ministry of Industry and Information Technology, Ministry of Transportation ... GB/T11348.4—1999
ISO Foreword
TS (International Organization for Standardization) is a worldwide federation composed of national standard promotion bodies (member bodies). The work of formulating international standards is completed by ISO's technical review committees. Each member body is interested in a certain technical standard and is recognized by the committee and has the right to participate in the work of this committee. International organizations (official or non-official) that maintain relations with IS may also participate in the relevant cooperation. TSO maintains a close cooperative relationship with the International Electrotechnical Commission (IFC) in the field of standardization of electrical technology. International standard proposals formally adopted by the Technical Committee shall be submitted to the member bodies for legal decision before being approved by the ISO Council. According to the ISC I procedure, international standards must obtain a difference of at least % of the members of the company to be formally adopted. Standard I507154 was developed by the second technical committee (SC2) of the ISO/TC.18 Mechanical vibration and shock committee of the International Organization for Standardization (applied to the measurement and evaluation of mechanical vibration of machinery, rollover and structure). S1 is composed of the following parts under the general category of non-modern machinery according to the design and evaluation of the dynamic shaft of the machine. 1 Scope
National Standard of the People's Republic of China
Measurement and evaluation of radial vibration of rotating shafts of rotating machinery Part 4 Gas turbine units
Mechanical properties of rotating shafts of rotating machinery Part 4 Gas turbine units
1 Scope
National Standard of the People's Republic of China
Measurement and evaluation of radial vibration of rotating shafts of rotating machinery Part 4 Gas turbine units
Mechanical properties of rotating shafts of rotating machinery Part 4 Gas turbine units
Mechanical properties of rotating shafts of rotating machinery Part 4 Gas turbine units vlbration or ron-reciprocating machinrsMeagurements on rotating shafts and evalwation criterinCart 4:Gas turbine ets
This standard specifies the measurement and evaluation criteria for the vibration of the rotating shaft of a gas turbine. GB/T11348.4—199S
e9v1507919-4:7996
This standard specifies that under normal working conditions, the measuring points for the vibration measurement of the rotating shaft of a gas turbine unit shall be located on the base of the unit or near the bearing seat.
The vibration limit value of the vehicle shall be determined by the vibration value and its change ratio under steady-state operating conditions. The torsion value specified in this standard shall not be used as a sole criterion for assessing vibration, because in general, the vibration state of the machine is assessed from two aspects: the vibration of the rotating shaft and the vibration of the related components (see GB/T11348.1 for explanation). The standard is applicable to gas turbine units (including gas turbine units with gearboxes) with dynamic auxiliary bearings, output power greater than 3M, and shaft tonnage of 1000r/min to 200r/min. According to the structural type and operating mode of industrial gas turbines, there are mainly three types: single-shaft constant speed gas turbine unit
single-shaft variable speed gas turbine unit maintenance
: gas generation and This standard is not applicable to the split-shaft gas turbine units with transmission. The main difference of this standard is that the shaft type (column bearing) is not the same as that of the industrial gas turbine units. The stiffness and excitation ratio of the structure are different: The same evaluation method is used for these three types of gas turbine units. For the various starting conditions, there are also different evaluation methods or different evaluation methods.
2 Reference standards
The following standards contain the texts. The texts are composed of the texts of the standards by citing the standards of the year. When the technical standards are published, the versions shown are valid. All standards will be subscribed by you. When using the technical standards, the latest version of the following standards may be used. GB/T11348. 1-1993 Measurement and evaluation of the vibration of rotating shafts in rotating machinery Part 1: General provisions GB/T 60% 5.1-1999 Measurement and evaluation of the vibration of rotating shafts in non-rotating machinery Part 1: General provisions 3 Measurement methods The measurement method and the correction device used shall comply with the method described in GB/T 11349.1. 3-1 Measurement data 3.1.1 Displacement In gas turbines, the displacement of the shaft relative to the bearing (relative displacement) shall be measured. Unless otherwise specified, this standard adopts the peak-to-static value of the vibration position residual image system approved by the Quality and Technical Supervision Bureau on September 1, 1999 as the trace value. 3 .1.2 Frequency
GB11348.4—1999
For gas turbines, due to the relatively high operating frequency, the rotational speed of the shaft is above 3Sr/min, so a non-conductive rotary sensor is used as a measuring device to measure the rotational speed. For monitoring purposes, the upper frequency limit of the measuring system should reach 2.5 times the maximum rated working speed. As for the construction, the frequency range of the system should be wider. 3.3-3 Displacement is a quantity related to vibration. In some cases, when evaluating the changes in the vibration state of the machine, the rotational level and the efficiency diagnosis, the dynamic phase of the relevant frequency components should be measured at the same time.
3.2. Point arrangement
Two shaft vibration sensors are installed radially on the same plane near the axis of rotation of the shaft at each bearing. The method of measuring the vibration of all bearings should be the same as far as possible. This standard recommends that sensors be installed at 45\ on each bearing. Manufacturers should provide conditions for installing vibration sensors when designing new units. Temporary measurement points can be added as needed during unit acceptance, new unit adjustment or vibration fault diagnosis. 4. Measurement
The sensors used for shaft vibration measurement of gas turbine units should meet the requirements of relevant standards. The shaft vibration measurement environment should be calibrated regularly. The relevant shaft vibration measurement instruments are more detailed. The specific requirements and indicators are further specified in the national standard for shaft vibration measurement instruments. 5. Assessment criteria
The following two criteria are used to assess the radial vibration of gas turbine shafts. The determination criteria of this standard are proposed under the full-state working conditions within the rated working load range. The standard is applicable to the determination and evaluation of the load under normal changes in load. This standard does not cover situations where sudden changes in operating conditions occur during operation, such as during the start-up and shutdown of the machine and when passing through the critical transition zone. In these cases, the larger of the peak-to-peak displacements of the two mutually perpendicular forces selected shall be used as the assessment tool. If the dynamic values ​​are equivalent, the empirical value can ensure the safe operation of the machine, then this empirical value is acceptable for operation. If only individual measurements are available, then care must be taken that the data provided are appropriate. See GB/T 11318.F15.1 Standard 1: Dynamic limit values ​​are determined based on the data under rated working conditions. The dynamic load band on the machine bearing shall be kept within an acceptable range, the radial stress on the machine casing shall be kept within an appropriate range, and the vibration transmitted to the support foundation shall be within an acceptable range. The maximum vibration amplitude on each bearing is evaluated in four design zones based on international experience. 6.1.1 Evaluation zones
The following defines the specific areas of the machine, so that the vibration of the machine shaft can be evaluated and, where possible, the ageing of the machine can be evaluated.
Zone A: The vibration of new units is usually within this range. Zone B: Units with vibration within this range are generally considered qualified and can be operated for a long time; Zone C: Units with vibration within this range are considered unqualified for long-term continuous operation. Generally, the unit can be operated in this state for a limited period of time before there is a chance to take corrective measures. This is the "and position" in this standard for rotor field dynamics modification. There are special points in 113. The key points are arranged in [door 79191. The sensor bracketed in the bracket is installed at the position of the upper half of the tree bearing. The sensor recommended by this invention is installed on both sides of the vertical center of the auxiliary bearing. The installation on site is more suitable. 2
GB/T11348.4-1999
1 zone. The operation is in this zone. It is considered dangerous. The violent operation is enough to cause the unit to be damaged. 5. 1. 2 Assessment area limit value
Based on the experience of the accumulated shaft operation measurement. The auxiliary vibration limit value (r/min) is based on the technical ratio. The recommended value in Figure 1 is derived from the following formula. 8
Axis rotation/(1C50·min-1)
Figure 1 Axis maximum relative motion limit
Set limit A/11
Scm=4800/V yuan gm
Region limit
Sp-ECCU/num
Region limit C/)
S:pp 13 200/ x pm
Here S is the amplitude peak value,
The recommended motion limit values ​​in this standard shall be agreed upon by the machine manufacturer and the user when used as the acceptance criteria for the equipment. It provides guidance for avoiding some quick and unrealistic requirements. In some cases, a specific machine may have certain special characteristics for which different values ​​(higher or lower) may be used. For example, for bearings with a bearing bearing capacity, other values ​​may be used. For related bearings, the perturbation limit values ​​for the bearing crown and the minimum bearing age can be used. In particular, it should be noted that the permissible perturbation may be related to the shaft or diameter. Generally speaking, the larger the bearing diameter, the greater its running tolerance: therefore, different evaluations are used for different bearing positions on the same shaft. However, in this case, it is usually necessary to explain the reasons for this, especially to ensure that the machine's required operation will not be endangered by excessive perturbations in this case. At other measuring points and in transient overload conditions, such as start-up and shutdown processes (including critical areas), these perturbation values ​​may not be required.
5.2 The
criterion is a standard for assessing the change of load amplitude based on the previous safety inspection or base load value. If the load amplitude changes significantly (increase or decrease), even if it still exceeds the range of the specified rule, some measures should be taken. This change may be instantaneous or gradual. It indicates that the machine has been damaged or a malfunction is a sign, or the overall situation of some irregular changes is determined based on the change of load amplitude under the operating conditions. The core value of this assessment criterion is a typical normal load value measured based on the operating conditions of the unit. If this baseline value changes significantly, specifically, if the change exceeds the upper limit of the range, whether the load amplitude is increased or decreased, measures should be taken to determine the cause. Moreover, it should be considered whether the machine is in a new stable state after the vibration change value appears before deciding what to do.
When selecting the standard 1, the comparison of vibration values ​​should be carried out at the same sensor position and position under similar machine operating conditions.
It must be noted that this method is based on the evaluation of the amplitude change, and its application is limited. The amplitude is only produced on individual components and may not be replaced in the shaft vibration signal (see GB/T11348.1). For example, the expansion of rotor crack effects may cause the rotation rate of the rotor to change gradually. However, their amplitude may be very small relative to the rotation rate of each revolution. Therefore, it is difficult to identify the expansion effect by only paying attention to the change of the wide-band vibration. Although some existing problems can be found by monitoring the vibration changes, in practical applications, it is necessary to determine the trend of the frequency components in the vibration signal by measuring and analyzing. However, these tasks require more advanced monitoring instruments and experienced professionals. The detailed description of this aspect of high-quality evaluation is beyond the scope of this standard. 6 Operating limits
61 From the perspective of long-term operation, the common method is to establish an independent operating limit. This limit is the alarm value and the interruption value. 5.1.1 Alarm value. When the unit reaches a certain amplitude and the vibration changes significantly, an alarm is provided. At this time, it may be necessary to take compensatory measures. If an alarm occurs, it can continue to operate for a period of time: but it must be investigated and studied to determine the cause of the disturbance and take certain compensatory measures. 6-1.2 Interruption value. It specifies a vibration amplitude. If the unit is operated beyond this value, it may cause damage. If the trip value is exceeded, measures should be taken immediately to reduce vibration or shut down the unit. For different wing positions and directions, the alarm values ​​and alarm values ​​during operation are also specified because of the load and bearing strength. 6-2 Alarm value setting 6.2.1 For different units, the alarm value may vary greatly. The alarm value is usually set relative to the load value. 6-2.2 Alarm value setting (baseline value + 5% of the B/C zone boundary value and the smaller of the B/C zone boundary value) The change relative to the base value shall not exceed 6% of the B zone boundary value. 3 In the case of a pure baseline value, such as for a new unit, the planned alarm value can be set based on other similar period of experience or the value acceptable to the user according to technical standards: after a period of operation, a steady-state baseline value can be established and the alarm setting can be adjusted accordingly.
6.2.4 If the base load value changes (e.g. the unit is in a state of tension), the recommended value setting may be modified. For different bearings on the unit, the recommended value setting may also be different due to different dynamic and support systems. 6.3 Determination of the brake value
GB/T 11348. 4 -1999
63.1 The brake value is related to the mechanical properties of the machine and depends on the design characteristics of the unit to withstand abnormal dynamic damage.For all similar units, the same value is generally used, and the passband is related to the stable base value method used to set the alarm. It is impossible to give an absolute value for different types of machines. Generally speaking, the gate position will be taken in the center or the outlet area. 6.3.2
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