CN103712746B - The acquiring method of Hysteresis phase lag in a kind of dynamic balance test of rotor - Google Patents
The acquiring method of Hysteresis phase lag in a kind of dynamic balance test of rotor Download PDFInfo
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- CN103712746B CN103712746B CN201410008820.5A CN201410008820A CN103712746B CN 103712746 B CN103712746 B CN 103712746B CN 201410008820 A CN201410008820 A CN 201410008820A CN 103712746 B CN103712746 B CN 103712746B
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Abstract
The present invention relates to the acquiring method of Hysteresis phase lag in a kind of dynamic balance test of rotor.By arranging current vortex sensor, phase demodulation sensor and vibration transducer on rotor-support-foundation system, utilization dynamic signal analyzer system measures shake spoke and phase place during rotor turns, according to Hysteresis phase lag and the overweight phasing degree of test result calculations rotor, be characterized in not adding test mass, and when lower than critical rotary speed, make rotor under same rotating speed, forward and oppositely each operation once, calculate Hysteresis phase lag and overweight phasing degree by the vibration of measuring and phase value.
Description
Technical field:
The present invention relates to the acquiring method about Hysteresis phase lag in a kind of dynamic balance test of rotor.
Background technology:
In dynamic balance test of rotor, all need the Hysteresis phase lag testing out rotor, determine by Hysteresis phase lag the phasing degree adding counterweight, whether Hysteresis phase lag test accurately directly affects precision and the success or failure of dynamic balance running.
Generally working speed lower than the rotor of critical rotary speed rigid rotator, working speed is flex rotor higher than critical rotary speed.Rigid rotator needs to determine Hysteresis phase lag by adding test mass, adds rotor before and after test mass and respectively runs once, then calculating machine drag angle.Flex rotor can not add test mass just can determine Hysteresis phase lag and overweight angle, but will run in critical rotary speed and could determine, because at this moment Hysteresis phase lag equals 90 degree, can determine the phasing degree adding counterweight thus.But rotor vibrates excessive through critical rotary speed sometimes, phasing degree accurately can not be recorded.Therefore how lower than on the rotating speed of critical rotary speed, and the phase place that test mass just accurately can determine Hysteresis phase lag and add counterweight need not be added just become extremely important.
Summary of the invention:
The object of this invention is to provide a kind of good reliability, measuring accuracy high, can realize lower than on the rotating speed of critical rotary speed, and the method for phase place that test mass just accurately can determine Hysteresis phase lag and add counterweight need not be added.The subject matter that the present invention will solve is the transient equilibrium of generator amature.The object of the invention is to be achieved through the following technical solutions: the present invention is the acquiring method about Hysteresis phase lag in a kind of dynamic balance test of rotor, and concrete steps are:
1) in armature spindle bearing, arrange low-frequency shock transducer and current vortex sensor, and make them
In alignment vertically, rotating shaft is arranged key photograph, key photograph will with key phase in the same horizontal line, the vibration signal of low-frequency shock transducer picker shaft bearing, the current vortex sensor pickup throw signal of rotating shaft and phase signal;
2) connect measuring system, low-frequency shock transducer and current vortex sensor are connected to data acquisition system (DAS), and data acquisition system (DAS) is connected to computing machine;
3) start-up simulation machine, operation state signal analysis software;
4) rotor turns is made, when vibrating and throw does not exceed standard, for the rotor of working speed lower than critical rotary speed, rotating speed should as much as possible close to working speed, for the rotor of working speed higher than critical rotary speed, rotating speed should as much as possible close to critical rotary speed;
5) data acquisition system (DAS) gathers signal, and computing machine compares analysis to the time domain waveform of the vibration gathered, throw and phase signal and frequency domain figure, and what obtain the vibration of each measuring point and throw signal turns frequency amplitude and phase place;
6) make rotor turns, with step 4) rotating speed is identical turns to contrary, repeats 4) to 5) and step;
7) through above-mentioned test, obtain vibration and throw signal, vibration signal and throw signal are used for calculating machine drag angle (4), supposing that, from key photograph (5) position, counterclockwise phasing degree is just, is negative clockwise, phasing degree, key photograph position is zero
8) because twice operation of rotor is along different directions, recording the high point (2) of the first vibration by running counterclockwise, recording the high point (3) of the second vibration by running clockwise, the phase place of the high point (2) of the first vibration
the phasing degree between the high point (2) of the first vibration and key photograph (5), the phase place of the high point (3) of the second vibration
the phasing degree between the high point (3) of the second vibration and key photograph (5),
9) the high point (2) of the first vibration, the second relative position vibrating high point (3) and key photograph (5) are drawn on rotor sectional view, vibrating the position, middle of high point (3) the first high point (2) of vibration and second is exactly overweight angle (1), overweight angle (1) is exactly Hysteresis phase lag (4) to the phasing degree of arbitrary high point, is formulated as:
Hysteresis phase lag (4):
Overweight angle (1) equals:
Wherein: θ is Hysteresis phase lag, unit: degree,
be the phase place of the high point (2) of the first vibration, unit: degree,
be the phase place of the high point (3) of the second vibration, unit: degree,
10) go out the Hysteresis phase lag of rotor and overweight angle by test result calculations, thus determine the direction adding counterweight, complete dynamic balance running.
Technique effect: use the present invention not adding test mass and to obtain the Hysteresis phase lag of rotor under lower than the rotating speed of critical rotary speed, thus determine the phase place that should add counterweight, complete dynamic balance running.Rotor operationally, due to the existence of damping, the point (being called high point) of its vibration maximal value is not same point with the overweight point of rotor, when rotating speed is lower, both relatively, when rotating speed equals critical rotary speed, both differ 90 degree, when rotating speed exceed and away from critical rotary speed time, both differences are close to 180 degree, after installation is complete, its Hysteresis phase lag is only relevant with rotating speed, when rotor clockwise direction rotates and counterclockwise rotate for rotor dynamic balancing system.Because other conditions of unit do not change, just sense of rotation changes, so its Hysteresis phase lag is identical under these two kinds of operating modes.In FIG, suppose that (5) are for phase demodulation sheet position (phase place is zero), (1) point is the overweight point of rotor, and phase place is just counterclockwise.When unit counterclockwise rotates, recording high point (2) phase place of vibration is
when unit clockwise direction rotates, recording high point (3) phase place of vibration is
Then Hysteresis phase lag:
Overweight angle:
Rigid rotator needs to determine Hysteresis phase lag by adding test mass, adds rotor before and after test mass and respectively runs once, then calculating machine drag angle, add an examination of great littlely to have a significant impact test result, test mass adds little, and test result is inaccurate, increase, rotor-support-foundation system can be made to produce very large vibration.Flex rotor can not add test mass just can determine Hysteresis phase lag and overweight angle, but will run in critical rotary speed and could determine, because at this moment Hysteresis phase lag equals 90 degree, can determine the phasing degree adding counterweight thus.But rotor vibrates excessive through critical rotary speed sometimes, phasing degree accurately can not be recorded.Therefore how lower than on the rotating speed of critical rotary speed, and the phase place that test mass just accurately can determine Hysteresis phase lag and add counterweight need not be added just become extremely important.Method of the present invention can avoid the generation of the problems referred to above, and method is easy, and easily, result is accurate in test.
Accompanying drawing illustrates:
Fig. 1 phase relation key diagram
Fig. 2 test macro connection layout
Embodiment:
As shown in Figure 2, about the acquiring method of Hysteresis phase lag in a kind of dynamic balance test of rotor,
Method comprises the steps:
1) in armature spindle bearing, arrange low-frequency shock transducer and current vortex sensor, and make them
In alignment vertically, rotating shaft is arranged key photograph, key photograph will with key phase in the same horizontal line, the vibration signal of low-frequency shock transducer picker shaft bearing, the current vortex sensor pickup throw signal of rotating shaft and phase signal;
2) connect measuring system, low-frequency sensor and current vortex sensor are connected to data acquisition system (DAS), and data acquisition system (DAS) is connected to computing machine;
3) start-up simulation machine, operation state signal analysis software;
4) rotor turns is made, when vibrating and throw does not exceed standard, for the rotor of working speed lower than critical rotary speed, rotating speed should as much as possible close to working speed, for the rotor of working speed higher than critical rotary speed, rotating speed should as much as possible close to critical rotary speed;
5) data acquisition system (DAS) gathers signal, and computing machine compares analysis to the time domain waveform of the vibration gathered, throw and phase signal and frequency domain figure, and what obtain the vibration of each measuring point and throw signal turns frequency amplitude and phase place;
6) make rotor turns, with step 4) rotating speed is identical turns to contrary, repeats 4) to 5) and step;
7) through above-mentioned test, obtain vibration and throw signal, vibration signal and throw signal are used for calculating machine drag angle (4), supposing that, from key photograph (5) position, counterclockwise phasing degree is just, is negative clockwise, phasing degree, key photograph position is zero
8) because twice operation of rotor is along different directions, recording the high point (2) of the first vibration by running counterclockwise, recording the high point (3) of the second vibration by running clockwise, the phase place of the high point (2) of the first vibration
the phasing degree between the high point (2) of the first vibration and key photograph (5), the phase place of the high point (3) of the second vibration
the phasing degree between the high point (3) of the second vibration and key photograph (5),
9) the high point (2) of the first vibration, the second relative position vibrating high point (3) and key photograph (5) are drawn on rotor sectional view, vibrating the position, middle of high point (3) the first high point (2) of vibration and second is exactly overweight angle (1), overweight angle (1) is exactly Hysteresis phase lag (4) to the phasing degree of arbitrary high point, is formulated as:
Hysteresis phase lag (4):
Overweight angle (1) equals:
Wherein: θ is Hysteresis phase lag, unit: degree,
be the phase place of the high point (2) of the first vibration, unit: degree,
be the phase place of the high point (3) of the second vibration, unit: degree,
10) go out the Hysteresis phase lag of rotor and overweight angle by test result calculations, thus determine the direction adding counterweight, complete dynamic balance running.
General rotor is all unbalanced, and when rotor operation, we can measure amplitude and the phase place of its vibration and throw, phase place relative to key photograph that, the phase place of key photograph position is zero, from key photograph, counterclockwise angle is just, clockwise angle is negative.The point of its vibration maximal value is called high point, is not same point with the overweight point of rotor, and during actual test, we directly can only measure the phase place of the high point of vibration, and Hysteresis phase lag and overweight phasing degree can only be obtained by calculating.
As shown in Figure 1, on rotor sectional view, phase place relative to key photograph 4 that, the phase place of phase demodulation sheet position is zero, counterclockwise phase place is just, clockwise phase is negative, and rotor is rotated counterclockwise, record the first vibration height point 2, then turn clockwise, record the second vibration height point 3, because rotating speed is constant, just direction is contrary, so Hysteresis phase lag is identical:
Hysteresis phase lag:
Overweight angle:
Go out the Hysteresis phase lag of rotor and overweight angle by test result calculations, thus determine the direction adding counterweight, complete dynamic balance running.
Test run result of the present invention proves:
By this measurement mechanism and method, can test mass do not added, and at the Hysteresis phase lag lower than acquisition rotor accurate under critical rotary speed, thus determine the phase place adding counterweight, complete rotor dynamic balancing work.
Claims (1)
1. the acquiring method of Hysteresis phase lag in dynamic balance test of rotor, is characterized in that: method comprises the steps:
1) in armature spindle bearing, low-frequency shock transducer and current vortex sensor is arranged, and make them in alignment vertically, rotating shaft is arranged key photograph, key photograph will with key phase in the same horizontal line, the vibration signal of low-frequency shock transducer picker shaft bearing, the throw signal of current vortex sensor pickup rotating shaft and phase signal;
2) connect measuring system, low-frequency shock transducer and current vortex sensor are connected to data acquisition system (DAS), and data acquisition system (DAS) is connected to computing machine;
3) start-up simulation machine, operation state signal analysis software;
4) rotor turns is made, when vibrating and throw does not exceed standard, for the rotor of working speed lower than critical rotary speed, rotating speed should as much as possible close to working speed, for the rotor of working speed higher than critical rotary speed, rotating speed should as much as possible close to critical rotary speed;
5) data acquisition system (DAS) gathers signal, and computing machine compares analysis to the time domain waveform of the vibration gathered, throw and phase signal and frequency domain figure, and what obtain the vibration of each measuring point and throw signal turns frequency amplitude and phase place;
6) make rotor turns, with step 4) rotating speed is identical turns to contrary, repeats 4) to 5) and step;
7) through above-mentioned test, obtain vibration and throw signal, vibration signal and throw signal are used for calculating machine drag angle (4), supposing that, from key photograph (5) position, counterclockwise phasing degree is just, is negative clockwise, phasing degree, key photograph position is zero
8) because twice operation of rotor is along different directions, recording the high point (2) of the first vibration by running counterclockwise, recording the high point (3) of the second vibration by running clockwise, the phase place of the high point (2) of the first vibration
the phasing degree between the high point (2) of the first vibration and key photograph (5), the phase place of the high point (3) of the second vibration
the phasing degree between the high point (3) of the second vibration and key photograph (5),
9) the high point (2) of the first vibration, the second relative position vibrating high point (3) and key photograph (5) are drawn on rotor sectional view, vibrating the position, middle of high point (3) the first high point (2) of vibration and second is exactly overweight angle (1), overweight angle (1) is exactly Hysteresis phase lag (4) to the phasing degree of arbitrary high point, is formulated as:
Hysteresis phase lag (4):
Overweight angle (1) equals:
Wherein: θ is Hysteresis phase lag, unit: degree,
be the phase place of the high point (2) of the first vibration, unit: degree,
be the phase place of the high point (3) of the second vibration, unit: degree,
10) go out the Hysteresis phase lag of rotor and overweight angle by test result calculations, thus determine the direction adding counterweight, complete dynamic balance running.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977124B (en) * | 2015-07-06 | 2017-12-12 | 沈阳申克动力机械有限公司 | Complete dynamic balancing shaft coupling |
| CN106092445A (en) * | 2016-08-11 | 2016-11-09 | 大唐长春第二热电有限责任公司 | Vector triangle calculates the method that method looks for rotor dynamic balancing |
| CN106100248B (en) * | 2016-08-23 | 2018-06-01 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of method whether inspection electric machine stand firmly installs |
| CN107063571A (en) * | 2017-06-09 | 2017-08-18 | 山东钢铁股份有限公司 | The balancing weight installation site measurement apparatus of dynamic balance running |
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| US5431049A (en) * | 1994-06-27 | 1995-07-11 | Ford Motor Company | Vehicle driveline balancing |
| CN101929908A (en) * | 2008-12-08 | 2010-12-29 | 广东省电力工业局试验研究所 | Unbalanced azimuth estimation method based on holo-spectrum technology |
| CN102564698A (en) * | 2011-12-21 | 2012-07-11 | 浙江省电力试验研究院 | Multi-rotor joint vibration mode balancing method for single support shafting steam turbine generator unit |
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| US7243023B2 (en) * | 2003-09-19 | 2007-07-10 | The Boeing Company | Engine balancing system and method |
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|---|---|---|---|---|
| US5431049A (en) * | 1994-06-27 | 1995-07-11 | Ford Motor Company | Vehicle driveline balancing |
| CN101929908A (en) * | 2008-12-08 | 2010-12-29 | 广东省电力工业局试验研究所 | Unbalanced azimuth estimation method based on holo-spectrum technology |
| CN102564698A (en) * | 2011-12-21 | 2012-07-11 | 浙江省电力试验研究院 | Multi-rotor joint vibration mode balancing method for single support shafting steam turbine generator unit |
Non-Patent Citations (2)
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| 一种高转速水轮发电机转子动平衡的试验方法;阙广庆;《大电机技术》;20121231(第2期);31-33 * |
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