CN102928611A - Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor - Google Patents
Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor Download PDFInfo
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- CN102928611A CN102928611A CN2012104175788A CN201210417578A CN102928611A CN 102928611 A CN102928611 A CN 102928611A CN 2012104175788 A CN2012104175788 A CN 2012104175788A CN 201210417578 A CN201210417578 A CN 201210417578A CN 102928611 A CN102928611 A CN 102928611A
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Abstract
The invention provides a second harmonic generation-based method for obtaining the critical rotation speed of a steam turbine rotor, and relates to a method for obtaining the critical rotation speed of the steam turbine rotor, aiming at solving the problem that the existing method for obtaining the critical rotation speed of the steam turbine rotor is large in error between a calculated value and a measured value, and the existing practical detection method is very great in boundedness. The method comprises the following steps of: 1, rising the highest rotation speed of the steam turbine rotor to 1800rpm, and confirming the critical rotation speed position of a second harmonic generation Bode picture in a steam turbine vibration monitoring system; 2, multiplying the value of a first-order critical rotation speed position in the second harmonic generation Bode picture by 2 to obtain the product value which is the first-order critical rotation speed of the steam turbine rotor; and 3, multiplying the value of a second-order critical rotation speed position in the second harmonic generation Bode picture by 2 to obtain the product value which is the second-order critical rotation speed of the steam turbine rotor. The method provided by the invention is used for obtaining the critical rotation speed of the steam turbine rotor.
Description
Technical field
The present invention relates to a kind of method of obtaining turbine rotor critical rotary speed.
Background technology
The existing turbine rotor critical rotary speed method of obtaining has two kinds, and a kind of is computing method, and another kind is measurement method.Computing method is to always existing certain error between the complicated boundary condition values such as the support stiffness of actual turbine rotor, oil film rigidity and the actual value, cause calculated value and measured value that very large discrepancy is arranged, the critical rotary speed that calculates is little to the directive significance of the operation of steam turbine and high-speed balancing; Although measurement method can accurately be measured the critical rotary speed of rotor, has significant limitation.At first, in the situation of critical rotary speed greater than working speed, just can not survey the critical rotary speed that obtains rotor; Secondly, in the high-speed balancing process, if the particular location of critical rotary speed when not knowing on the working speed near working speed is which first order mode by rotor causes with regard to being difficult to determine vibration under the working speed, so very large on the high-speed balancing impact of turbine rotor.
To sum up, the existing turbine rotor critical rotary speed method of obtaining exists the large and measurement method of calculated value and measured value error to have the problem of significant limitation.
Summary of the invention
The present invention exists calculated value and measured value error to have greatly the problem of significant limitation with measurement method in order to solve the existing turbine rotor critical rotary speed method of obtaining, and then proposes a kind of method of obtaining turbine rotor critical rotary speed based on two frequencys multiplication.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: the method for obtaining turbine rotor critical rotary speed based on two frequencys multiplication of the present invention realizes according to following steps:
Step 3, obtain the second order critical rotary speed of turbine rotor: the numerical value of the second order critical rotary speed position of two frequency multiplication Bode figure in the step 1 be multiply by two, and the product numerical value that obtains is turbine rotor second-order critical rotary speed.
The invention has the beneficial effects as follows:
The method of obtaining turbine rotor critical rotary speed of the present invention when the turbine rotor rotating speed reaches 1800rpm by can determine accurately the analysis of two frequency multiplication Bode figure rotor at 3600rpm with each interior rank critical rotary speed, avoided because the error of calculated value is misled during to unit actual motion and high-speed balancing, make unit needn't raising speed just can measure actual Critical Speed during to the rotating speed that surpasses critical rotary speed, for the operation of instructing unit or high-speed balancing provides reliable basis; Rotating speed accuracy that method of the present invention is obtained is high, error is little, applied widely, comprises all 50Hz and 60Hz rotor, for the operation of instructing unit or high-speed balancing provides reliable basis.
Description of drawings
Fig. 1 is that (wherein horizontal ordinate represents the rotating speed of turbine rotor to frequency multiplication Bode figure of the present invention, ordinate represents the amplitude of turbine rotor) Fig. 2 is two frequency multiplication Bode of the present invention figure (wherein horizontal ordinate represents the rotating speed of turbine rotor, and ordinate represents the amplitude of turbine rotor).
Embodiment
Embodiment one: shown in Fig. 1～2, the described method of obtaining turbine rotor critical rotary speed based on two frequencys multiplication of present embodiment realizes according to following steps:
Step 3, obtain the second order critical rotary speed of turbine rotor: the numerical value of the second order critical rotary speed position of two frequency multiplication Bode figure in the step 1 be multiply by two, and the product numerical value that obtains is turbine rotor second-order critical rotary speed.
Bode figure is Bode diagram.
As can be seen from Figure 1, in order to obtain second-order critical rotary speed, existing method must rise to the rotating speed of turbine rotor more than the 2720rpm, adopt acquisition methods of the present invention, the rotating speed of turbine rotor only need be raised to 1500rpm just can obtain one fully, the position of second order critical rotary speed, as shown in Figure 2, first critical speed among the two frequency multiplication Bode is 835rpm, second order critical rotary speed is 1385rpm, 835*2=1670rpm is the first critical speed of rotor so, 1385*2=2770rpm is the second order critical rotary speed of rotor, as can be seen from Figure 1, the tachometer value that obtains very near the first rank actual measurements critical rotary speed 1650rpm and second-order critical rotary speed 2720rpm among the frequency multiplication Bode figure, therefore has the rotary speed precision of obtaining height, can satisfy in operation and the transient equilibrium process needs to the critical rotary speed position fully.
Embodiment two: the error range of turbine rotor the first rank critical rotary speed is 10～30 to turn in the present embodiment step 2.Other is identical with embodiment one.
Embodiment three: the error range of turbine rotor second-order critical rotary speed is 50～90 to turn in the present embodiment step 3.Other is identical with embodiment one.
Claims (3)
1. one kind is obtained the method for turbine rotor critical rotary speed based on two frequencys multiplication, and it is characterized in that: the described method of obtaining turbine rotor critical rotary speed realizes according to following steps:
Step 1, determine the critical rotary speed position: to 1800rpm, then utilize the two frequency multiplication Bode figure in the Supervisory Instrumentation of Steam Turbine Vibration to determine the critical rotary speed position the highest raising speed of rotating speed of turbine rotor;
Step 2, obtain the first critical speed of turbine rotor: the numerical value of the first critical speed position of two frequency multiplication Bode figure in the step 1 be multiply by two, and the product numerical value that obtains is turbine rotor the first rank critical rotary speed;
Step 3, obtain the second order critical rotary speed of turbine rotor: the numerical value of the second order critical rotary speed position of two frequency multiplication Bode figure in the step 1 be multiply by two, and the product numerical value that obtains is turbine rotor second-order critical rotary speed.
2. according to claim 1ly obtain the method for turbine rotor critical rotary speed based on two frequencys multiplication, it is characterized in that: the error range of turbine rotor the first rank critical rotary speed is 10～30 to turn in the step 2.
3. according to claim 1ly obtain the method for turbine rotor critical rotary speed based on two frequencys multiplication, it is characterized in that: the error range of turbine rotor second-order critical rotary speed is 50～90 to turn in the step 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104175788A CN102928611A (en) | 2012-10-26 | 2012-10-26 | Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104175788A CN102928611A (en) | 2012-10-26 | 2012-10-26 | Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor |
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| CN102928611A true CN102928611A (en) | 2013-02-13 |
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| CN2012104175788A Pending CN102928611A (en) | 2012-10-26 | 2012-10-26 | Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510621A (en) * | 2015-09-28 | 2016-04-20 | 沈阳鼓风机集团安装检修配件有限公司 | Method and device for obtaining critical rotating speed of centrifugal compressor |
| CN105806622A (en) * | 2016-05-26 | 2016-07-27 | 沈阳工程学院 | Experimental method for measuring critical speed influencing factors for steam turbine rotor |
| CN114673567A (en) * | 2022-01-24 | 2022-06-28 | 岭澳核电有限公司 | Method and system for controlling rotating speed of steam turbine |
| CN115876454A (en) * | 2023-03-03 | 2023-03-31 | 西安航天动力研究所 | Over-rotation test method and over-rotation test stand |
-
2012
- 2012-10-26 CN CN2012104175788A patent/CN102928611A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 刘晓东: "汽轮机转子临界转速计算分析", 《装备制造技术》 * |
| 寇胜利: "用倍频法判断发电机的二阶临界转速", 《中国电力》 * |
| 张玉龙，李铜桥: "汽轮机转子临界转速计算方法", 《汽轮机技术》 * |
| 沈荣华，黎桂英: "小功率汽轮机轴系临界转速计算及其特性分析", 《机械》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510621A (en) * | 2015-09-28 | 2016-04-20 | 沈阳鼓风机集团安装检修配件有限公司 | Method and device for obtaining critical rotating speed of centrifugal compressor |
| CN105510621B (en) * | 2015-09-28 | 2018-10-30 | 沈阳鼓风机集团安装检修配件有限公司 | A kind of centrifugal compressor critical speed acquisition methods and device |
| CN105806622A (en) * | 2016-05-26 | 2016-07-27 | 沈阳工程学院 | Experimental method for measuring critical speed influencing factors for steam turbine rotor |
| CN114673567A (en) * | 2022-01-24 | 2022-06-28 | 岭澳核电有限公司 | Method and system for controlling rotating speed of steam turbine |
| CN114673567B (en) * | 2022-01-24 | 2024-05-24 | 岭澳核电有限公司 | Turbine rotating speed control method and system |
| CN115876454A (en) * | 2023-03-03 | 2023-03-31 | 西安航天动力研究所 | Over-rotation test method and over-rotation test stand |
| CN115876454B (en) * | 2023-03-03 | 2023-07-14 | 西安航天动力研究所 | Overrun test method and overrun test stand |
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Application publication date: 20130213 |