JP2011080894A - Unbalance measuring apparatus, standard vibration exciter and unbalance measuring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reproducibility of an unbalance measuring apparatus and improve the operability in unbalance measurement. <P>SOLUTION: The unbalance measuring apparatus includes: an attachment mount 4 on which a rotation machine to be measured or a vibration generator 19 for generating a known vibrating force is mounted; vibration sensors 25, 26 attached to the attachment mount; a force sensor 18 for detecting the vibrating force; a control device 21 for controlling such that the vibration generator generates the vibrating force; and a computer 27 for computing a vibration characteristic of the attachment mount based on detection signals from the vibration sensors and the force sensor. The control device controls the vibration generator in such a manner that the vibrating force generated by the vibration generator becomes a predetermined value based on the detection signals from the force sensor and the vibration sensors with the vibration generator being mounted on the attachment mount. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an unbalance measuring device for measuring an unbalance of a setting of a rotating machine, a reference shaker mounted on the unbalance measuring device and confirming reproducibility of the unbalance measuring device, and the reference shaker The present invention relates to an unbalance measurement method using a slab.

  In a rotating machine such as a turbocharger, the unbalance causes vibration during high-speed rotation, which greatly affects noise and product life due to vibration. It is installed and the supercharger is operated at high speed to detect the unbalance amount and correct the unbalance.

  First, referring to FIG. 6, an outline of a conventional unbalance measuring apparatus will be described.

  In the figure, reference numeral 1 denotes a vibration table supported by a bar spring 2, and a mounting mount 4 is attached to the vibration table 1 via a seat plate 3, and a rotating machine such as a supercharger 5 is horizontally mounted on the mounting mount 4. Mounted on.

  The mounting mount 4 also serves as a turbine casing. By supplying high-pressure compressed air to the mounting mount 4, the turbine impeller 6 rotates and is further connected via a rotating shaft 7. 8 is designed to rotate.

  The vibration generated by the rotation of the turbine impeller 6 and the compressor impeller 8 is detected by a vibration detector, for example, an acceleration sensor 9 attached to the seat plate 3, and the turbine impeller 6 and the compressor impeller 8 are detected. Is detected by a rotation detector 11 provided opposite to the shaft end of the rotating shaft 7.

  The vibration and the rotation speed detected by the acceleration sensor 9 and the rotation detector 11 are input to the calculator 12 as a vibration detection signal and a rotation speed detection signal, respectively. Based on the detection signal, the unbalance amount and position are calculated.

  In the above-described unbalance measuring device, it is necessary to calibrate appropriately in order to stably detect the unbalance amount of the rotating machine with a predetermined accuracy. Further, when changing the rotating machine to be measured, it is necessary to change the mounting mount 4 in accordance with the changed rotating machine. The mounting state of the mounting mount 4, for example, the reproducibility depending on the tightening condition of the bolt. May be affected. For this reason, calibration is required even when the mounting mount 4 is changed.

  In the conventional calibration, an unbalance measuring device is calibrated by attaching a reference rotator having known mechanical characteristics such as vibration characteristics to the mounting mount 4 and rotating the reference rotator.

  However, there has been a problem that the reproducibility of the excitation force of the reference rotator is poor due to deterioration of the reference rotator, changes in the vibration state due to the mounting conditions of the reference rotator, and variations. For this reason, it is difficult to identify whether the measurement results obtained with the unbalance measuring device are poor in reproducibility of the excitation force of the reference rotating body or poor in reproducibility of the unbalance measuring device. Met.

  Furthermore, when measuring the vibration characteristics of a rotating machine, the measurement result may include abnormal mounting of the rotating machine, but in the unbalance measurement using the conventional unbalance measuring device, whether the measurement result includes abnormal mounting. It is difficult to determine the wearing abnormality, and even when the wearing abnormality is confirmed, it is further difficult to specify the wearing abnormality site.

JP 2002-39904 A Japanese Patent Laid-Open No. 7-174658

  In view of such circumstances, the present invention aims to improve the reproducibility of the unbalance measuring device, to improve the reproducibility of the excitation force of the reference shaker attached to the unbalance measuring device, and to further improve the reference excitation. This makes it easy to determine the cause of reduced reproducibility caused by the machine, facilitates the proper installation of the reference shaker, prevents the drop in reproducibility caused by the reference shaker, and is used for unbalance measurement. It is intended to improve the workability in this.

  The present invention includes a mounting mount to which a rotating machine to be measured or a vibration generator that generates a known excitation force is attached, a vibration sensor attached to the attachment mount, a force sensor that detects the excitation force, A control device for controlling the vibration generator to generate an exciting force; and the vibration sensor, and a calculator for calculating vibration characteristics of the mounting mount based on a detection signal from the force sensor. With the vibration generator attached, the control device controls the vibration generator based on the force sensor and a detection signal from the vibration sensor so that the excitation force generated by the vibration generator becomes a predetermined value. The present invention relates to an unbalance measuring apparatus configured in the same manner.

  Further, according to the present invention, the vibration generator generates an oscillating force in one direction and can be mounted in two postures orthogonal to the mounting mount, and the calculator generates the vibration generator in each posture. An unbalance measuring device that calculates vibration characteristics with respect to the applied excitation force and synthesizes one vibration characteristic obtained in one posture and the other vibration characteristic obtained in the other posture with a phase shift of 90 °. It is concerned.

  The present invention further includes a display device, wherein the computing unit has a reference vibration characteristic obtained by mounting the vibration generator, and is obtained by mounting a rotating machine to be measured on the mounting mount. Further, the present invention relates to an unbalance measuring device that displays the measured vibration characteristics and the reference vibration characteristics on the display device.

  According to the present invention, there is provided an unbalance measuring device in which the computing unit has a sample vibration characteristic against an abnormal setting of the rotating machine, and displays the sample vibration characteristic, the reference vibration characteristic, and the measured vibration characteristic on the display device. It is concerned.

  The present invention is also a reference exciter that is mounted on an unbalance measuring device for measuring an imbalance of a rotating machine and generates an excitation force for confirming reproducibility in the unbalance measuring device. A vibration generator that is mounted on a mounting mount of a measuring device and generates a unidirectional vibration force, a vibration sensor that is mounted on the mounting mount and detects vibration in the direction of action of the vibration force, and a vibration force A force sensor for detecting, and a control device for controlling the excitation force generated by the vibration generator. The control device detects a signal detected by the vibration sensor and a force sensor for detecting the excitation force. The reference vibration exciter is configured to control the vibration generator so that the excitation force becomes a predetermined value based on the received signal.

  According to the present invention, the vibration generator can be mounted in two directions orthogonal to the mounting mount, and the mounting mount has two vibration sensors corresponding to the mounting position of the vibration generator. The present invention relates to a reference vibration exciter that is capable of generating an excitation force in two directions orthogonal to each other by the vibration generator.

  According to the present invention, there is provided an unbalance measuring method for measuring an unbalance of a rotating machine by the above-described unbalance measuring apparatus, a step of acquiring a reference vibration characteristic by mounting the vibration generator, and a rotating machine to be measured And a step of acquiring the measured vibration characteristics by attaching to the unbalance measuring method of determining a setting abnormality of the rotating machine by comparison with the reference vibration characteristics.

  The present invention also includes a step of obtaining a sample vibration characteristic for the setting abnormality of the rotating machine, and a comparison of the reference vibration characteristic, the sample vibration characteristic and the measured vibration characteristic to determine the type of setting abnormality of the rotating machine and the setting abnormality. The present invention relates to an unbalance measurement method for determining a part.

  According to the present invention, a mounting mount to which a rotating machine to be measured or a vibration generator for generating a known excitation force is attached, a vibration sensor attached to the attachment mount, a force sensor for detecting the excitation force, A control device that controls the vibration generator to generate an excitation force; and a calculator that calculates vibration characteristics of the mounting mount based on a detection signal from the vibration sensor and the force sensor. In a state where the vibration generator is mounted on the mount, the control device controls the vibration generator so that the excitation force generated by the vibration generator becomes a predetermined value based on the detection signal from the force sensor and the vibration sensor. Since it is configured to control, it is possible to suppress a sudden increase in excitation force in the vicinity of the resonance point of the vibration generator, thereby improving the reproducibility, measurement accuracy, and reliability of measurement data.

  Further, according to the present invention, the vibration generator generates a unidirectional excitation force and can be mounted in two postures orthogonal to the mounting mount. The vibration characteristics for the excitation force generated in step 1 are calculated, and one vibration characteristic obtained in one posture and the other vibration characteristic obtained in the other posture are synthesized with a phase shift of 90 °. The vibration generator that generates the directional excitation force can measure vibration characteristics equivalent to the case where the excitation force is generated by rotation, thereby simplifying the device and reducing the cost.

  According to the invention, it further comprises a display device, wherein the computing unit has a reference vibration characteristic obtained by mounting the vibration generator, and the mounting mount is mounted with a rotating machine to be measured. Since the measured vibration characteristics and the reference vibration characteristics obtained are displayed on the display device, the reproducibility of the measurement vibration characteristics with respect to the reference vibration characteristics and the abnormality of the measurement vibration characteristics with respect to the reference vibration characteristics can be easily determined. It becomes.

  According to the present invention, the computing unit has a sample vibration characteristic for a setting abnormality of the rotating machine, and displays the sample vibration characteristic, the reference vibration characteristic, and the measured vibration characteristic on the display device. Regarding the abnormality, it becomes easy to determine the type and part of the setting abnormality, and the workability in correcting the setting abnormality is improved.

  According to the present invention, there is provided a reference exciter that is attached to an unbalance measuring device for measuring an imbalance of a rotating machine and generates an excitation force for confirming reproducibility in the unbalance measuring device. A vibration generator that is mounted on the mounting mount of the unbalance measuring device and generates a unidirectional vibration force, a vibration sensor that is mounted on the mounting mount and detects vibration in the direction of action of the vibration force, A force sensor for detecting a force and a control device for controlling the excitation force generated by the vibration generator, the control device detecting a signal detected by the vibration sensor and a force sensor for detecting the excitation force The vibration generator is controlled so that the excitation force becomes a predetermined value based on the detected signal, so that the excitation force generated by the vibration generator is stabilized and the reproducibility of the measurement data Improved measurement accuracy and reliability That.

  Further, according to the present invention, the vibration generator can change the mounting posture in two directions orthogonal to the mounting mount, and the mounting mount has two vibrations corresponding to the mounting posture of the vibration generator. Since the sensor is provided and the vibration generator can generate the excitation force in two directions orthogonal to each other, the measurement of the vibration characteristic with respect to the excitation force due to the rotation can be measured with an inexpensive apparatus.

  According to the present invention, in the unbalance measuring method for measuring the unbalance of the rotating machine by the above-described unbalance measuring device, the step of acquiring the reference vibration characteristic by mounting the vibration generator, Since a rotating machine setting abnormality is determined by comparing the reference vibration characteristic with the process of obtaining the measured vibration characteristics by mounting the rotating machine, the setting abnormality of the rotating machine can be easily determined. Acquired measurement results can be eliminated and measurement accuracy and reliability can be improved.

  According to the present invention, the step of obtaining the sample vibration characteristic for the setting abnormality of the rotating machine, the type of setting abnormality of the rotating machine, the setting by comparing the reference vibration characteristic, the sample vibration characteristic and the measured vibration characteristic Since the location of the abnormality is determined, the type of setting abnormality and the location of the setting abnormality can be quickly identified when there is a setting abnormality, and the setting abnormality can be corrected in a short time, thereby shortening the measurement work and improving efficiency. Exhibits excellent effects such as.

It is a schematic diagram of the unbalance measuring device with which this invention is implemented, and shows the state which is measuring the vibration of a horizontal direction. It is the same schematic diagram as before and shows a state in which vertical vibration is being measured. It is a graph which shows the relationship between the frequency at the time of not performing feedback control, and excitation force. It is a graph which shows the relationship between the frequency at the time of feedback control, and an excitation force. (A) is a graph which shows the vibration characteristic measured using the reference | standard vibrator which concerns on this invention, (B)-(D) is a graph which shows the vibration characteristic corresponding to setting abnormality. It is the schematic which shows the conventional unbalance measuring device.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are schematic views of an unbalance measuring apparatus in which the present invention is implemented. In FIG. 1 and FIG. 2, the same components as those shown in FIG. .

  A mounting mount 4 is installed via a bar spring 2, and a rotating machine (not shown) can be attached to and detached from the mounting mount 4 and a known excitation force can be applied instead of the rotating machine. The machine 15 is detachable. Although not shown, the unbalance measuring device includes a display device that displays the measurement result.

  The reference shaker 15 includes a fixed base 16 for fixing to the mounting mount 4, and a shaker body 17 is attached to the fixed base 16, and a force sensor is further attached to the shaker body 17. A vibration generator 19 is attached via 18. The fixed base 16 can be attached to the mounting mount 4 by rotating by 90 ° about a horizontal axis. Therefore, the vibration exciter body 17 can be changed in attitude by 90 ° with respect to the mounting mount 4. The vibration generator 19 can also be installed at a horizontal position and a vertical position.

  The vibrator main body 17 may be rotated by 90 ° with respect to the fixed base 16, or the vibration generator 19 may be in a horizontal position or a vertical position with respect to the vibrator main body 17. The mounting may be changed.

  In a state where the vibration generator 19 is installed in a horizontal position (see FIG. 1), the vibration generator 19 generates a horizontal excitation force on the vibrator main body 17, and the vibration generator 19 is vertical. In the state of being installed at the position (see FIG. 2), a vertical exciting force is generated in the vibrator main body 17. The center line of the vibration generator 19, that is, the line of action of the excitation force, passes through the center of the rotating shaft 7 regardless of whether the vibration generator 19 is in a horizontal position or a vertical position. .

  The vibration generator 19 is a rotary shaker that generates vibration by rotating an eccentric rotating body at a high speed by a motor, or an inertial excitation that generates an excitation force by a reaction force that an inertia mass vibrates. A machine or the like is used. In the present embodiment, it is preferable to use an inertia-type vibrator that generates a stable sinusoidal excitation force.

  The reference vibrator 15 includes a control device 21 for controlling the vibration force of the vibration generator 19.

  The control device 21 includes a control unit 22, a sine wave oscillator 23, and a vibration generation drive unit 24, and controls the drive of the vibration generator 19 so that the vibration generator 19 generates an excitation force with a sine wave. is doing. Further, based on feedback signals from a horizontal vibration sensor 25 and a vertical vibration sensor 26 described later, the drive of the vibration generator 19 is controlled so that the excitation force of the vibration generator 19 becomes constant.

  The mounting mount 4 is provided with a horizontal vibration sensor 25 for detecting horizontal vibration and a vertical vibration sensor 26 for detecting vertical vibration. The horizontal vibration sensor 25 and the vertical vibration sensor 26 are provided. The detection signal detected by is input to the calculator 27.

  The detection signals detected by the horizontal direction vibration sensor 25 and the vertical direction vibration sensor 26 are input to the control device 21 as a feedback signal.

  Hereinafter, the operation of checking and calibrating the reproducibility of the unbalance measuring apparatus using the reference shaker 15 will be described.

  First, as shown in FIG. 1, the case where the vibration generator 19 is provided in a horizontal position will be described.

  The sine wave oscillator 23 generates a sine wave having a predetermined frequency, and the sine wave is input to the vibration generation drive unit 24. The vibration generation drive unit 24 drives the vibration generator 19 so as to generate a sinusoidal excitation force based on the input sine wave.

  A sinusoidal excitation force is applied from the vibration generator 19 to the shaker body 17. Accordingly, the mounting mount 4 is applied with an exciting force having a sine wave shape and a predetermined frequency in the horizontal direction via the vibrator main body 17.

  The horizontal vibration sensor 25 detects horizontal vibration, and the detection result is input to the calculator 27 and the control unit 22. The force sensor 18 detects the excitation force of the vibration generator 19, and the detection result is input to the calculator 27 and the control unit 22. Since the vertical vibration sensor 26 detects vertical vibration, there is no signal from the vertical vibration sensor 26 in the state where a horizontal excitation force is applied by the vibration generator 19. It is ready. Furthermore, the signal from the vertical vibration sensor 26 may be electrically cut off.

  The calculator 27 calculates the impedance (vibration characteristics) of the mounting mount 4 based on the detected vibration and excitation force. The calculated impedance is graphed and displayed on a display device (not shown).

Here, if the excitation force of the vibration generator 19 is Fsinωt and the output of the horizontal vibration sensor 25 is αsin (ωt + φ) having a phase φ with respect to the excitation force, the mechanical impedance I ( ω) is
I (ω) = αsin (ωt + φ) / Fsinωt
Given in.

  Therefore, the reproducibility in the horizontal direction can be confirmed depending on whether the measured mechanical impedance I of the mounting mount 4 matches the reference impedance at the frequency or within an allowable error range. Yes.

  The vibration signal from the horizontal vibration sensor 25 and the excitation force signal from the force sensor 18 are stored as horizontal vibration characteristics in a storage unit (not shown) inside the calculator 27.

  Next, the vibration generator 19 is changed to a vertical position, and similarly, the vibration generator 19 is driven and controlled by the control device 21. The vibration generator 19 applies a vertical excitation force to the mounting mount 4.

  Vertical vibration is detected by the vertical vibration sensor 26, and the excitation force at this time is detected by the force sensor 18, and both detection results are input to the calculator 27. In this case as well, the signal emitted from the horizontal vibration sensor 25 may be electrically cut off.

  The calculator 27 calculates the mechanical impedance I of the mounting mount 4 in the same manner as described above. Similarly, the reproducibility in the vertical direction depends on whether the measured mechanical impedance I of the mounting mount 4 matches the reference impedance at that frequency or within an allowable error range. You can check.

  Further, the vibration signal from the vertical vibration sensor 26 and the excitation force signal from the force sensor 18 are stored as vertical vibration characteristics in a storage unit (not shown) inside the calculator 27.

  As described above, by changing the mounting position of the vibration generator 19, the mechanical impedance I in each of the horizontal direction and the vertical direction can be measured, and reproducibility can be confirmed by comparison with the reference impedance.

  Next, based on the horizontal vibration characteristics and the vertical vibration characteristics stored in the computing unit 27, the vibration characteristics with respect to the excitation force rotating on the mounting mount 4, that is, the excitation force applied by rotation of the high-speed rotating body is obtained. Obtainable.

  That is, by synthesizing the vertical vibration characteristic with a 90 ° phase shift with respect to the horizontal vibration characteristic, vibration generated by rotation of the high-speed rotating body, mechanical impedance, vibration against the excitation force applied by the vibration Characteristics can be obtained, and the reproducibility of the unbalance measuring device can be confirmed and evaluated in a state closer to the measurement of the product. At this time, the phase shift amount may be a value other than 90 ° in accordance with the assumed vibration of the rotating body.

  The vibration generator 19 applies an exciting force to the vibrator main body 17 while changing the frequency. However, the vibration generator 19 itself has a resonance point and generates an excitation force in the vicinity of the resonance point. In this case, as shown in FIG. 3, the excitation force increases rapidly. For this reason, measurement data reproducibility is impaired.

  A vibration detection signal is fed back from the horizontal direction vibration sensor 25 and the vertical direction vibration sensor 26 to the control unit 22 and an excitation force detection signal detected by the force sensor 18 is fed back.

  Based on the vibration detection signal and the excitation force detection signal fed back, the control unit 22 issues a deviation signal with respect to a reference excitation force to the oscillation generation drive unit 24 so that the excitation force becomes constant, The generation drive unit 24 controls the drive signal to the vibration generator 19 so that the deviation becomes zero.

  FIG. 4 shows the state of the excitation force when the excitation force is feedback-controlled, and a constant excitation force is obtained even in the vicinity of the resonance point of the vibration generator 19 itself by feedback control of the excitation force. Can be generated.

  When the vibration generator 19 applies a constant excitation force at any frequency, the measurement of the vibration characteristics of the unbalance measuring device is stabilized, and calibration with high accuracy can be performed.

  Next, when calibration of the unbalance measuring device is completed and the unbalance of the rotating machine (hereinafter referred to as a workpiece) is measured by the unbalance measuring device, if the workpiece is not properly attached to the unbalance measuring device, the measurement is performed. It becomes unclear whether the result is due to workpiece imbalance or the effect of workpiece mounting (setting), and the reliability and reproducibility of the measurement results are reduced.

  Further, even when it is determined that the measurement result is a setting abnormality, it is difficult to specify which part is defective. For example, retighten the bolts at the required part, perform unbalance measurement, check the setting status, and if the setting is abnormal, retighten the bolt at other parts and perform unbalance measurement again. , In a trial and error manner.

  In this embodiment, it is possible to determine whether there is a setting abnormality from the measurement result by the unbalance measuring device, and in which part the setting abnormality is present, so that a measurement result that is not affected by the setting state can be obtained, In addition, even if there is a setting abnormality, the cause can be easily estimated, the setting abnormality can be corrected quickly, and imbalance measurement can be improved. Hereinafter, determination of workpiece setting abnormality in the unbalance measuring apparatus will be described.

  Using the reference shaker 15, vibration characteristic data of the unbalance measuring device is acquired and stored in the calculator 27 as reference vibration characteristic data.

  Also, based on the vibration characteristic data when there is a past setting abnormality, or further intentionally causing a setting abnormality to acquire vibration characteristic data, the vibration corresponding to the type and part of the setting abnormality Characteristics are collected and converted into data as sample vibration characteristics.

  FIG. 5A shows a reference vibration characteristic 30 acquired using the reference shaker 15.

  Next, it is assumed that a workpiece is set on the mounting mount 4 and measured to acquire vibration characteristics, and the result is shown in FIG. The measured vibration characteristics obtained by measurement and the reference vibration characteristics are superimposed and displayed on the same screen. In the vibration characteristic shown in FIG. 5B, the peak value of the measurement vibration characteristic is shifted to the low frequency side with respect to the reference vibration characteristic.

  If it is known that the peak value is shifted to the low frequency side, for example, if it is known that the peak value is caused by looseness of the workpiece, it is determined from the sample vibration characteristic data that the workpiece is loosened.

  In addition, as shown in FIG. 5C, a small peak is measured on the low frequency side with respect to the reference vibration characteristic. In this case, if it is known that the reason why a small peak is measured on the low frequency side is the looseness of the mounting mount, the looseness of the mounting mount 4 is considered as the cause by comparing with the vibration characteristic data. It is done.

  FIG. 5D is a vibration characteristic obtained by other measurement, and a peak appears on the higher frequency side than the peak value of the reference vibration characteristic.

  If the high frequency side peak is measured only by the supercharger and the high frequency side peak cannot be measured by the measurement by the reference shaker 15, this is a cause other than the setting abnormality of the supercharger, for example, disturbance due to fluid. it is conceivable that.

  As described above, the reference vibration characteristic is stored, the reference characteristic is compared with the measurement reference characteristic, and further compared with the sample vibration characteristic acquired in advance, whether there is a setting abnormality, and further, the setting failure part. Identification and estimation are possible, and prompt response is possible when there is an abnormality in the measurement data.

  In the above description, the mounting posture of the vibration generator 19 is horizontal and vertical. However, the mounting posture is not limited to horizontal and vertical, and may be mounted in two orthogonal directions.

DESCRIPTION OF SYMBOLS 1 Shaking table 2 Bar spring 4 Mounting mount 15 Reference | standard vibration machine 16 Fixed base 17 Excitation body 18 Force sensor 19 Vibration generator 21 Control apparatus 22 Control part 23 Sine wave oscillator 24 Vibration generation drive part 25 Horizontal direction vibration sensor 26 Vertical direction vibration sensor 27

Claims (8)

  A mounting mount to which a rotating machine to be measured or a vibration generator for generating a known excitation force is attached, a vibration sensor attached to the attachment mount, a force sensor for detecting the excitation force, and the vibration generator A control device that controls the generation of an excitation force; a vibration sensor; and a calculator that calculates a vibration characteristic of the mounting mount based on a detection signal from the force sensor. In a mounted state, the control device is configured to control the vibration generator based on detection signals from the force sensor and the vibration sensor so that the excitation force generated by the vibration generator becomes a predetermined value. An unbalance measuring device.   The vibration generator generates an oscillating force in one direction and can be mounted in two postures orthogonal to the mounting mount, and the computing unit is responsive to the exciting force generated by the vibration generator in each posture. 2. The unbalance measuring apparatus according to claim 1, wherein the vibration characteristic is calculated, and one vibration characteristic obtained in one posture and the other vibration characteristic obtained in the other posture are synthesized with a phase shifted by 90 degrees.   A display device, wherein the computing unit has a reference vibration characteristic obtained by attaching the vibration generator, and a measurement vibration characteristic obtained by attaching a rotating machine to be measured to the mounting mount; The unbalance measuring apparatus according to claim 1, wherein the reference vibration characteristic is displayed on the display device.   The unbalance measuring device according to claim 1, wherein the computing unit has a sample vibration characteristic with respect to a setting abnormality of the rotating machine, and displays the sample vibration characteristic, the reference vibration characteristic, and the measured vibration characteristic on the display device.   A reference exciter mounted on an unbalance measuring device for measuring unbalance of a rotating machine and generating an excitation force for confirming reproducibility in the unbalance measuring device, wherein the mounting mount for the unbalance measuring device A vibration generator that generates a unidirectional excitation force, a vibration sensor that is attached to the mounting mount and detects vibration in the direction of action of the excitation force, and a force sensor that detects the excitation force And a control device for controlling the excitation force generated by the vibration generator, the control device based on a signal detected by the vibration sensor and a signal detected by the force sensor for detecting the excitation force. A reference shaker configured to control the vibration generator so that the excitation force becomes a predetermined value.   The vibration generator can change its mounting posture in two directions orthogonal to the mounting mount, and the mounting mount is provided with two vibration sensors corresponding to the mounting posture of the vibration generator, and the vibration The reference exciter according to claim 5, wherein the generator can generate the excitation force in two directions orthogonal to each other.   An unbalance measuring method for measuring an unbalance of a rotating machine by the unbalance measuring apparatus according to claim 1, wherein a step of acquiring a reference vibration characteristic by mounting the vibration generator and a rotating machine to be measured are mounted Then, a measurement abnormality characteristic is determined, and a setting abnormality of the rotating machine is determined by comparison with the reference vibration characteristic.   Claiming a sample vibration characteristic for an abnormal setting of the rotating machine and comparing the reference vibration characteristic, the sample vibration characteristic and the measured vibration characteristic to determine the type of abnormal setting of the rotating machine and the location of the abnormal setting. Item 7. The imbalance measurement method according to Item 7.

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