JP2018159659A - Pseudo vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pseudo vibrator capable of vibrating a test object in a pseudo manner using large acceleration at a relatively low frequency.SOLUTION: A pseudo vibrator 1 includes: a table 10 allowing for placement of a test object 20 at a center of rotation 12; a drive device 30 for rotationally driving the table 10; a cycle setting unit 52 capable of setting a rotation cycle of the table 10; and an inclination adjustment unit 40 capable of setting the table 10 at a prescribed inclination angle θ to a horizontal plane. The pseudo vibrator 1 rotates the table 10 in an inclined state, and thereby vibrates the test object 20 in a pseudo manner. The test object 20 is an accelerometer capable of measuring acceleration due to earthquake. The pseudo vibrator 1 is a calibration device of the accelerometer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pseudo vibration exciting device for generating vibration in a pseudo manner.

  Conventionally, an accelerometer is generally employed as a vibration measuring instrument. In recent years, acceleration of accelerometers is being promoted, and accelerometer calibration standards are being studied accordingly. As calibration standards for accelerometers, vibration calibration standards such as international standard ISO16063-11 have been proposed.

  As proposed in the international standard, the accelerometer is calibrated by attaching an accelerometer to be calibrated to the shaker and vibrating, and the vibration measured by the accelerometer and the amplitude measured by the laser interferometer. The accelerometer is calibrated by comparing. In this case, the vibration of the vibrator is made to coincide with the sensitivity axis that can be measured by the accelerometer.

For example, when the conventional vibrator is vibrated at an amplitude (displacement) of 36 cm and a frequency of 0.1 Hz, the measurable acceleration level is 0.03 m / s ² . The seismic intensity in the earthquake (the seismic intensity class in the Japan Meteorological Agency) is affected not only by the magnitude of the acceleration but also by the period of shaking, duration, ground of the observation point, topography, etc. 0.03 m / s ² is seismic intensity 1 or less. In other words, accelerometers that are calibrated with conventional shakers are usually calibrated within a range that is less than the seismic intensity that humans can experience (high sensitivity as an accelerometer), and large earthquakes that damage buildings. Calibration at acceleration and large amplitude is not practical. In particular, in a conventional vibrator, it is difficult to determine whether or not the acceleration when the vibrator is vibrated with a relatively long period can be accurately detected.

  In addition, an acceleration measuring instrument has been proposed for grasping the characteristics of an accelerometer having an accelerometer (Patent Document 1). This acceleration measuring instrument measures acceleration by applying gravitational acceleration to an accelerometer attached to a turntable extending in the vertical direction. The turntable is rotated by hand and fixed at a predetermined position, and the performance of the accelerometer is measured by comparing the gravitational acceleration components on the X and Y axes at that angle with the output value of the accelerometer. Since the acceleration applied to the acceleration measuring instrument does not vary with time, the frequency characteristics cannot be measured.

On the other hand, there is a full-scale vibration testing device that reproduces the shaking of a building due to an earthquake and tests the durability of the building. The full-scale vibration test apparatus can actually construct a building on a large shaking table and vibrate the shaking table horizontally with a large hydraulic jack. In this type of test apparatus, the longer the period of vibration, the greater the stroke required to generate a predetermined acceleration, making it difficult to reproduce long-period ground motion. For example, when it is desired to generate an acceleration of 10 cm / s ² (corresponding to seismic intensity 2 to 3) in a cycle of 10 seconds, the required stroke is about 1 m.

JP 7-318577 A

  An object of the present invention is to provide a pseudo-vibration device capable of quasi-exciting a subject using a large acceleration at a relatively low frequency.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

[Application Example 1]
The pseudo vibration device according to this application example is
A table on which the subject can be placed at the center of rotation;
A driving device for rotationally driving the table;
A cycle setting unit capable of setting a rotation cycle of the table;
An inclination adjusting unit capable of setting the table at a predetermined inclination angle with respect to a horizontal plane;
Including
The object is simulated in a simulated manner by rotating the table in an inclined state.

  According to the pseudo vibration apparatus according to this application example, it is possible to artificially vibrate the subject with a relatively low frequency and a large acceleration.

[Application Example 2]
In the simulated vibration device according to this application example,
A control unit, an inclination angle setting unit capable of setting a time change in the inclination angle of the table, and an inclination driving device for inclining the table,
The control unit controls the driving device so that the table rotates according to a rotation cycle set by the cycle setting unit,
The control unit can control the tilt driving device so that the table tilts in accordance with a time change of the tilt angle set by the tilt angle setting unit.

  According to the pseudo vibration device according to this application example, it is possible to perform vibration while freely changing the acceleration and the frequency.

[Application Example 3]
In the simulated vibration device according to this application example,
The subject is an accelerometer,
The pseudo-vibration device may be a calibration device for the accelerometer.

  According to the pseudo vibration device according to this application example, the accelerometer can be calibrated in a relatively low frequency region.

[Application Example 4]
In the simulated vibration device according to this application example,
An acceleration calculation unit that calculates a set acceleration to be given to the subject based on the tilt angle set by the tilt adjustment unit;
A determination unit that compares the set acceleration with an output signal of the accelerometer to determine characteristics of the accelerometer in a rotation cycle set by the cycle setting unit;
Can further be included.

  According to the pseudo vibration device according to this application example, the characteristics of the accelerometer can be determined based on the set acceleration and the output signal of the accelerometer.

[Application Example 5]
In the simulated vibration device according to this application example,
The subject is a building,
The pseudo vibration exciter can give a pseudo earthquake motion to the building.

  According to the pseudo-vibration apparatus according to this application example, relatively low frequency seismic motion can be reproduced for a building.

  According to the pseudo vibration apparatus according to the present invention, it is possible to provide a pseudo vibration apparatus that can vibrate a subject in a pseudo manner using a large acceleration at a relatively low frequency.

It is a front view of the pseudo vibration apparatus which concerns on one Embodiment. It is a right view of the pseudo vibration apparatus which concerns on one Embodiment. It is a front view which shows the state which inclined the table of the pseudo vibration apparatus which concerns on one Embodiment. It is a front view explaining the component of the gravitational acceleration of the subject in a state where the table is tilted. It is a top view of the subject on a table. It is a graph which shows the relationship between the inclination angle of a table, and the acceleration amplitude which acts on a subject. It is a graph which shows the acceleration of the X direction and Y direction which act on a subject when a table is rotated with a fixed period. It is a graph which shows the relationship between the acceleration and stroke in a conventional uniaxial vibrator. It is the front view which made the subject on a table the building. It is a right view of the pseudo vibration apparatus which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are essential constituent requirements of the present invention.

  The pseudo-vibration device according to the present embodiment includes a table on which a subject can be placed at the center of rotation, a driving device that rotationally drives the table, a cycle setting unit that can set the rotation cycle of the table, and the table. And a tilt adjustment unit that can be set to a predetermined tilt angle with respect to a horizontal plane, and rotating the table in a tilted state to cause the subject to vibrate in a pseudo manner.

1. Pseudo-Exciting Device The pseudo-exciting device 1 will be described with reference to FIGS. FIG. 1 is a front view of a pseudo vibration device 1 according to an embodiment, FIG. 2 is a right side view of the pseudo vibration device 1 according to the embodiment, and FIG. 3 is a pseudo vibration device according to the embodiment. It is a front view which shows the state which inclined the table 10 of the apparatus 1. FIG.

  As shown in FIGS. 1 to 3, the pseudo-vibration apparatus 1 sets a table 10 on which a subject 20 can be placed at a rotation center 12, a drive device 30 that rotates the table 10, and a rotation cycle of the table 10. A possible cycle setting unit 52 and a tilt adjusting unit 40 capable of setting the table 10 to a predetermined tilt angle θ with respect to the horizontal plane are included. The driving device 30 and the inclination adjusting unit 40 are fixed on the base plate 2. The period setting unit 52 is included in the control unit 50.

1-1. Table The table 10 has a disk shape in plan view. The upper surface 14 of the table 10 is substantially flat and has a plurality of through holes (not shown). The through hole is a bolt hole for fixing the subject 20 to the upper surface 14.

  The subject 20 is fixed at the position of the rotation center 12 of the table 10. The subject 20 will be described later.

1-2. Drive Device The drive device 30 includes a motor 32, a driver 34 that drives the motor 32, and a rotating shaft 36 of the motor 32.

  The motor 32 is an electric motor, for example, a brushless AC motor. The motor 32 may include a reduction gear. The motor 32 may include an encoder that detects the rotation direction, rotation position, and rotation speed of the table 10.

  The driver 34 drives the motor 32. The driver 34 includes a part of the function of the control unit 50, and the drive of the motor 32 is controlled in accordance with a command from the driver 34 that is a part of the control unit 50. Since the driver 34 includes a part of the function of the control unit 50, the reference numerals are shown in parentheses in FIGS. The driver 34 may include a cycle setting unit 52 that sets the rotation cycle of the table 10.

  The rotation shaft 36 is fixed to the lower surface of the table 10 so as to be coaxial with the rotation center 12 of the table 10. By driving the motor 32, the rotary shaft 36 rotates and the table 10 can be rotated at a desired cycle.

1-3. Inclination adjustment unit The inclination adjustment unit 40 includes two fixing plates 41 and 41 fixed on the base plate 2 with a gap therebetween, and an angle meter 42 provided on the fixing plate 41 on the front side of the pseudo-vibration apparatus 1. And a clamp knob 44 that can tilt the table 10 and a tilt base 48 to which the clamp knob 44 is fixed.

  The fixed plate 41 is formed with a slit 45 so that the clamp knob 44 can rotate about the inclined rotation shaft 46. When the clamp knob 44 is fastened to the fixed plate 41, the fixed plate 41 and the inclined base 48 are fixed, and the tilt of the table 10 can be fixed. When the clamp knob 44 is loosened with respect to the fixing plate 41, the tilt of the table 10 can be adjusted by rotating the clamp knob 44 along the slit 45.

  The tilt base 48 is supported between the fixed plates 41 and 41 so as to be rotatable about the tilt rotation shaft 46. The clamp knob 44 and the inclined base 48 are integral. By rotating the clamp knob 44 along the slit 45, the tilt base 48 can be rotated around the tilt rotation shaft 46 with respect to the fixed plate 41.

  The motor 32 is fixed to the tilt base 48, and the table 10 fixed to the rotation shaft 36 of the motor 32 rotates around the tilt rotation shaft 46 together with the tilt base 48. Therefore, by rotating the clamp knob 44 along the slit 45, the table 10 can be tilted (for example, the state of FIG. 3) with respect to the horizontal direction (the state of FIG. 1).

  The goniometer 42 is provided with a scale indicating an angle, and it can be confirmed how many times the upper surface 14 of the table 10 is tilted with respect to a reference horizontal plane. A person who operates the simulated vibration exciter 1 can set the table 10 to a predetermined inclination angle by operating the clamp knob 44 while confirming the goniometer 42.

  In the present embodiment, the tilt angle of the table 10 is manually adjusted using the clamp knob 44. However, by further providing a motor and a driver that rotate the tilt rotation shaft 46 as a center, the table is instructed by the control unit 50. 10 may be automatically set to a predetermined inclination angle.

  According to the simulated vibration apparatus 1, the subject 20 can be oscillated in a pseudo manner by rotating the table 10 in an inclined state. That is, the period of vibration in the subject 20 can be set by the rotational speed of the table 10, and the amplitude and acceleration of vibration can be set by the component of gravitational acceleration in the subject 20. By setting the period of the table 10 to be long (rotation speed is slow) by the period setting unit 52, it is possible to vibrate a long period. Moreover, if the inclination angle of the table 10 is increased by the inclination adjusting unit 40, an acceleration corresponding to, for example, a measured seismic intensity of 5 can be generated in a pseudo manner. Therefore, according to the pseudo-vibration apparatus 1, it is possible to perform pseudo-vibration by applying a relatively low frequency and large acceleration to the subject 20 as compared with the conventional reciprocating vibrator. Details of the vibration in the subject 20 will be described later.

1-4. Control Unit The control unit 50 includes a cycle setting unit 52 that can set the rotation cycle of the table 10. Although not illustrated in detail, the control unit 50 can include a calculation unit (CPU or the like), a storage unit (ROM, RAM, HDD, or the like), a communication unit (communication interface or the like), and a display unit (display or the like).

  The driver 34 having a part of the function of the control unit 50 drives the motor 32 at a predetermined rotation speed based on the rotation cycle set by the cycle setting unit 52 and rotates the table 10 at the set rotation cycle. The rotation period set by the period setting unit 52 may be set so that the rotation speed of the table 10 is always constant, or the rotation speed of the table 10 may be set to change with time. Although the driver 34 has a part of the function of the control unit 50, the present invention is not limited to this, and the control unit 50 outputs a command to the driver 34 based on the rotation cycle set by the cycle setting unit 52, and the command Accordingly, the driver 34 may drive the motor 32 at a predetermined rotational speed. If the control unit 50 can output a command to the driver 34, it is possible to set a free rotation cycle such as gradually changing the rotation cycle of the table 10.

  The control unit 50 includes an acceleration calculation unit 54 that calculates a set acceleration applied to the subject 20 based on the tilt angle set by the tilt adjustment unit 40. The set inclination angle is an angle formed by the upper surface 14 of the table 10 with respect to the horizontal plane. The acceleration calculation unit 54 manually inputs the tilt angle set by the tilt adjustment unit 40 or calculates the set acceleration in the subject 20 facing in the tilt direction, for example, based on the automatically acquired angle data. be able to.

  The control unit 50 may further calculate the time change of the set acceleration in the rotation cycle set by the cycle setting unit 52.

  When the subject 20 is an accelerometer described later, the control unit 50 can include a determination unit 56 that determines the characteristics of the accelerometer by comparing the set acceleration with the output signal of the accelerometer. According to the simulated vibration apparatus 1, the characteristics of the accelerometer can be determined based on the set acceleration and the output signal of the accelerometer.

1-5. Acceleration acting on the subject The acceleration acting on the subject 20 will be described with reference to FIGS. FIG. 4 is a front view for explaining the component of the gravitational acceleration g of the subject 20 in a state where the table 10 is tilted, and FIG. 5 is a plan view of the subject 20 on the table 10. The near side of the drawing in FIG.
On the left side. 6 is a graph showing the relationship between the inclination angle θ (°) of the table 10 and the acceleration amplitude g sin θ (cm / s ² ) acting on the subject 20, and FIG. 7 shows the table 10 at a constant period T (seconds). FIG. 8 is a graph showing the accelerations a _x and a _y (cm / s ² ) in the X and Y directions that act on the subject 20 when rotated, and FIG. 8 shows the acceleration (cm / s) in a conventional single-axis vibrator. It is a graph which shows the relationship between ² ) and stroke (cm).

  As shown in FIGS. 4 and 5, the direction of the gravitational acceleration g viewed from the subject 20 varies depending on the orientation of the subject 20 with respect to the tilt direction of the table 10. When the table 10 having the subject 20 placed on the upper surface 14 as shown in FIG. 4 is tilted at an inclination angle θ (°) with respect to the horizontal plane, the gravitational acceleration g acts on the center of the subject 20 as shown in FIG.

  As shown in FIG. 5, when the table 10 is rotated around the rotation center 12 at an inclination angle θ (°) at a constant rotation speed (for example, T seconds for one rotation), the subject 20 (for example, the subject 20) The direction of the gravitational acceleration g acting in the (X direction) gradually changes depending on the direction of the subject 20. The component of the gravitational acceleration g in the tilt direction of the table 10 in the subject 20 is gsin θ.

  An angle φ formed by the tilt direction of the subject 20 and the table 10 is expressed by Expression (1).

（ｔ：回転開始からの経過時間（秒）、φ_０：回転開始前のテーブル１０の傾斜方向と被検体２０の向きのずれ角（°））。

(T: Elapsed time (seconds) from the start of rotation, φ ₀ : Deviation angle (°) between the tilt direction of the table 10 and the direction of the subject 20 before the rotation starts.

Further, at this time, the acceleration (cm / s ² ) acting in the front-rear direction (Y direction) and the left-right direction (X direction) as viewed from the subject 20 is expressed by Expression (2) and Expression (3).

（ａ_ｘ：被検体２０から見て左右方向（Ｘ方向）に働く加速度（ｃｍ／ｓ^２）、ａ_ｙ：被検体２０から見て前後方向（Ｙ方向）に働く加速度（ｃｍ／ｓ^２））。

(A _x : acceleration acting in the left-right direction (X direction) as viewed from the subject 20 (cm / s ² )) a _y : acceleration acting in the front-rear direction (Y direction) as seen from the subject 20 (cm / s ² ) ).

Therefore, the subject 20 on the rotating tilted table 10 is in the same state as being vibrated with a steady acceleration having an amplitude of g sin θ (cm / s ² ) and a period of T (seconds).

Specifically, as shown in FIG. 6, the acceleration amplitude gsin θ (cm / s ² ) acting on the subject 20 changes corresponding to the tilt angle θ (°) of the table 10, and the tilt angle θ (°). The acceleration increases with increasing. Further, as shown in FIG. 7, the X-direction acceleration a _x and the Y-direction acceleration a _y acting on the subject 20 change in accordance with the rotation period of the table 10.

What is important here is that the amplitude g sin θ (cm / s ² ) (= acceleration) is determined independently of the acceleration period T (seconds) (= the rotation period of the table 10) only from the inclination angle θ (°) of the table 10. Is in the point to be.

  As shown in FIG. 8, in a conventional shaker that has been used to vibrate some subject 20, the cycle and acceleration and the stroke (of the shaking table / vibrating table) are closely connected. There is a serious relationship. Therefore, in a conventional vibrator, it is necessary to increase the stroke in order to extend the period while keeping the acceleration constant. In other words, in the case of using the conventional technique, in order to perform long-period excitation, it is inevitable to increase the size of the test apparatus. It is practically impossible to carry out with (assuming). Note that the relationship between the acceleration and the measured seismic intensity in FIG. 8 is a guide only.

  On the other hand, in the pseudo-vibration apparatus 1, the acceleration amplitude gsinθ and the period T can be controlled completely independently, and the stroke is always zero (only rotates around the rotation center 12). There is no problem.

  In addition, when the pseudo-vibration apparatus 1 has a drive mechanism that can change the tilt angle θ of the table 10 by a command from the control unit 50, the tilt angle θ and the period T of the table 10 set in advance by the control unit 50 are used. By outputting a command to change the value, it is possible to reproduce not only the sinusoidal excitation as shown in FIG.

2. Subject The subject 20 will be described with reference to FIGS. The subject 20 needs to give vibration in a pseudo manner, and is, for example, an accelerometer, a building, or the like.

2-1. Accelerometer As shown in FIGS. 1 to 3, the subject 20 is an accelerometer, and the pseudo-vibration apparatus 1 can be an accelerometer calibration device. By using the pseudo-vibration apparatus 1, the accelerometer can be calibrated in a relatively low frequency region.

  A well-known thing can be employ | adopted as an accelerometer. For example, in the classification of acceleration sensing methods, an accelerometer of an electrostatic type, a piezoelectric type, a resistance type, a thermal / fluid type, an electrodynamic type, a magnetic type, a servo type, or the like can be employed. As a method for manufacturing the accelerometer, for example, an accelerometer based on MEMS (Micro Electro Mechanical Systems) manufacturing technology can be employed.

2-2. Accelerometer calibration method The accelerometer calibration method is as follows.

  First, the target accelerometer is fixed on the table 10 like the subject 20 in FIG.

Next, the tilt adjusting unit 40 sets a predetermined tilt angle θ of the table 10. The inclination angle θ set in, for example, a personal computer serving as the control unit 50 is input. The acceleration calculation unit 54 calculates a predetermined acceleration (gsin θ (cm / s ² )) acting on the subject 20 in the tilt direction of the table 10.

  Next, the set cycle (T (seconds)) is input to the cycle setting unit 52 of the control unit 50. The control unit 50 combines the set period and the set acceleration to obtain the relationship between the period T and the acceleration (gsin θ) as shown in FIG.

  Next, the table 10 of the pseudo-vibration apparatus 1 is actually rotated by the driving device 30 at the set inclination angle θ and period T in accordance with a command from the control unit 50, and the actual value is output from the output value of the accelerometer (subject 20). The acceleration time change data is obtained.

  Then, the determination unit 56 of the control unit 50 compares the actual acceleration time change with the set acceleration time change obtained from the calculation result of the control unit 50, so that the accelerometer has predetermined characteristics. It can be determined whether or not. That is, according to the simulated vibration apparatus 1, the characteristics of the accelerometer can be determined based on the set acceleration and the output signal of the accelerometer.

2-3. Building An example in which the subject 20 is a building will be described with reference to FIG. FIG. 9 is a front view of the subject 20 on the table 10 as a building.

  As shown in FIG. 9, the building is installed as the subject 20 on the table 10 of the pseudo-vibration apparatus 1a which has been enlarged. Although omitted in FIG. 9, below the table 10, similarly to FIG. 1, a drive device 30 that rotates the table 10 around the rotation center 12 and an inclination adjustment unit 40 are provided in an enlarged size. Yes.

  The simulated vibration exciter 1a can give a pseudo earthquake motion to the building as the subject 20 by inclining the table 10 to a predetermined inclination angle and rotating the table 10 at a predetermined cycle. Since the basic operation is the same as that of the pseudo-vibration apparatus 1, detailed description is omitted. In particular, it is advantageous in that a relatively low frequency (long period) seismic motion that cannot be reproduced by a conventional full-scale vibration testing apparatus for a building can be reproduced for the building.

  If a plurality of accelerometers are installed in the building on the table 10, it is possible to measure the influence of the long-period ground motion on the building.

3. Modification A simulated vibration apparatus 1b according to a modification will be described with reference to FIG. FIG. 10 is a right side view of the simulated vibration exciter 1b according to the modification. The same components as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 10, the pseudo excitation device 1 b according to the modification has the same basic configuration as the pseudo excitation device 1 of FIGS. 1 to 5. The simulated vibration exciter 1b includes a tilt driving device 60 instead of the clamp knob 44 of the tilt adjusting unit 40. The driver 34 of the driving device 30 and the driver of the tilting driving device 60 are not shown, but may be included in the control unit 50.

  The control unit 50b controls the driving device 30 so that the table 10 rotates according to the rotation cycle set by the cycle setting unit 52. The rotation period set by the period setting unit 52 may be a fixed period, or may be set so that the period changes (the period changes with time). The control unit 50b can vibrate the subject 20 while freely changing the frequency.

  The control unit 50b includes an inclination angle setting unit 58 that can set a change in the inclination angle of the table 10 with time. The tilt adjusting unit 40b includes a tilt driving device 60 that tilts the table 10. The control unit 50 b controls the tilt driving device 60 so that the table 10 tilts according to the time change of the tilt angle set by the tilt angle setting unit 58. The control unit 50b can vibrate the subject 20 while freely changing the acceleration.

The tilting drive device 60 includes a tilting motor 62 fixed to the base plate 2, a belt 64, and a plurality of pulleys. The tilting motor 62 is an electric motor, for example, a brushless AC motor. The tilting motor 62 may include a speed reducer. The tilting motor 62 may include an encoder for detecting the tilt angle of the table 10. The tilting motor 62 is
The tilt base 48 (and the table 10) can be rotated around the tilt rotation shaft 46 via the plurality of pulleys and the belt 64.

  Since the simulated vibration exciter 1b can freely set the inclination angle and rotation speed of the table 10, not only the vibration with a constant period and constant amplitude but also the period and amplitude change every moment like an actual earthquake. Such vibration can also be reproduced.

  Moreover, you may apply to the building which enlarged the pseudo | simulation vibration apparatus 1b and demonstrated in FIG.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 1,1a, 1b ... Pseudo-vibration apparatus, 2 ... Base board, 10 ... Table, 12 ... Center of rotation, 14 ... Top surface, 20 ... Subject, 30 ... Drive apparatus, 32 ... Motor, 34 ... Driver, 36 ... Rotation Axis, 40, 40b: Inclination adjusting part, 41: Fixed plate, 42: Angle meter, 44: Clamp knob, 45 ... Slit, 46 ... Inclination rotating shaft, 47 ... Belt, 48 ... Inclination base, 49 ... Inclination motor, 50, 50b ... Control unit, 52 ... Cycle setting unit, 54 ... Acceleration calculation unit, 56 ... Determining unit, 58 Inclination angle setting unit, 60 ... Tilt drive device, 62 ... Tilt motor, 64 ... Belt

Claims (5)

A table on which the subject can be placed at the center of rotation;
A driving device for rotationally driving the table;
A cycle setting unit capable of setting a rotation cycle of the table;
An inclination adjusting unit capable of setting the table at a predetermined inclination angle with respect to a horizontal plane;
Including
A pseudo-vibration apparatus characterized in that the subject is pseudo-vibrated by rotating the table in an inclined state. In claim 1,
A control unit, an inclination angle setting unit capable of setting a time change in the inclination angle of the table, and an inclination driving device for inclining the table,
The control unit controls the driving device so that the table rotates according to a rotation cycle set by the cycle setting unit,
The pseudo-exciting device, wherein the control unit controls the tilt driving device so that the table tilts according to a time change of the tilt angle set by the tilt angle setting unit. In claim 1 or 2,
The subject is an accelerometer,
The pseudo-vibration apparatus is a calibration apparatus for the accelerometer. In claim 3,
An acceleration calculation unit that calculates a set acceleration to be given to the subject based on the tilt angle set by the tilt adjustment unit;
A determination unit that compares the set acceleration with an output signal of the accelerometer to determine characteristics of the accelerometer in a rotation cycle set by the cycle setting unit;
The pseudo-exciting device further comprising: In claim 1 or 2,
The subject is a building,
The pseudo-vibration device is configured to give a pseudo-earthquake motion to the building.

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