CN111257594B - Ultralow-frequency triaxial nuclear power plant seismic accelerometer calibration table and calibration method - Google Patents
Ultralow-frequency triaxial nuclear power plant seismic accelerometer calibration table and calibration method Download PDFInfo
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Abstract
The invention provides an ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table and a calibration method, wherein a rotary table support is driven by a servo motor and a motor rotating shaft to do circular motion, and an objective table rotating shaft and an objective table are driven by two belt pulleys and a crossed transmission belt to do reverse circular rotation with the same period, so that azimuth angles of the objective table and the seismic accelerometer to be measured do not change in the rotating process, and the objective table and the seismic accelerometer to be measured are translated relative to the static ground; when the rotary table support rotates, a sine period-changing acceleration value is applied to the seismic accelerometer to be tested, so that the testing function of precision and frequency response of the seismic accelerometer under ultralow frequency is realized; the invention can output sine acceleration values with the frequency below 2Hz and the acceleration value being adjustable, meets the regulations of the 'NB/T20076 nuclear power station seismic instrument criterion', and fills the market blank; the invention has simple structure, reduces the test cost, simplifies the test flow and lightens the burden of testers.
Description
Technical Field
The invention belongs to the technical field of sensor calibration, and particularly relates to an ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table and a calibration method.
Background
The nuclear power plant seismic accelerometer is a key equipment component of a nuclear power plant seismic monitoring system, and according to the 'NB/T20076 nuclear power plant seismic instrument criterion', the seismic instrument system operated by a nuclear power plant must be stopped for overhaul maintenance detection in each power plant overhaul period, so that channel calibration of the system is completed, calibration and inspection are carried out on the seismic accelerometer component, and the performance characteristics such as precision, frequency response and the like are tested.
The standard of the seismic instrument of the NB/T20076 nuclear power station prescribes that the operating frequency range prescribed by the seismic accelerometer of the nuclear power station is 0.02 Hz-50 Hz, and the frequency response of a sensor, the sensitivity of the acceleration response under a given frequency and the sensitivity of the transverse axis are required to be detected when the components of the seismic accelerometer are calibrated. In the current stage, the calibration of the seismic accelerometer is carried out by adopting the seismic platform, the frequency lower limit of the main stream seismic platform on the market is mostly above 5Hz, and a few seismic platforms can reach 2Hz, but the standard calibration and measurement requirements of the seismic accelerometer of the nuclear power station cannot be met.
Disclosure of Invention
The invention aims to solve the technical problems that: the ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table and the calibration method are provided, and are used for realizing the function of testing the precision and frequency response of the seismic accelerometer under ultra-low frequency.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table comprises a servo motor, a motor rotating shaft, a scale, an upper bearing, an objective table rotating shaft, a belt pulley 1, a belt pulley 2 and a driving belt; the motor rotating shaft is fixedly connected with a rotor of the servo motor, and the motor rotating shaft is in a vertical direction; one end of the scale is fixed at the top of the motor rotating shaft, and the scale is perpendicular to the motor rotating shaft; the upper bearing is movably connected with the scale and moves along the length direction of the scale; one end of the objective table rotating shaft, which is close to the top, is fixedly connected with the rotor of the upper bearing, and the top of the objective table rotating shaft is fixedly connected with the sensor to be measured; the external diameters of the belt pulley 1 and the belt pulley 2 are the same, the belt pulley 1 is sleeved on the motor rotating shaft and fixed with the motor rotating shaft, the belt pulley 2 is sleeved on the objective table rotating shaft and fixed with the objective table rotating shaft, the driving belt is wound on the belt pulley 1 and the belt pulley 2 in a 8-shaped cross manner, and the motor rotating shaft, the objective table rotating shaft, the belt pulley 1, the belt pulley 2 and the driving belt form belt transmission.
According to the scheme, the servo motor comprises a base, and the servo motor is fixed on the base.
According to the scheme, the motor rotating rod is perpendicular to the motor rotating shaft, the midpoint of the rotating rod is fixed to the top of the motor rotating shaft, and the scale is fixed to one side of the rotating rod from the endpoint of any one end to the midpoint.
Further, the turntable comprises a turntable bracket, wherein the turntable bracket comprises a bracket cross rod and a bracket vertical rod which are mutually and vertically fixed; the support montant is fixed in the one end that does not have fixed scale of rotary rod, and support montant is perpendicular with the rotary rod, and support horizontal pole is parallel with support horizontal pole rotary rod.
Further, the rotary table comprises a lower bearing, a rotor of the lower bearing is fixedly connected with one end, far away from the top, of the rotary table rotating shaft, the lower bearing is movably connected with a support cross rod of a rotary table support, and the lower bearing moves along the length direction of the support cross rod.
According to the scheme, the bearing further comprises a locking bolt, and the locking bolt is in threaded connection with the upper bearing; when the locking bolt is screwed down, the relative positions of the upper bearing and the scale are fixed; when the lock bolt is released, the upper bearing moves along the length direction of the scale.
According to the scheme, the sensor to be measured is fixed on the upper surface of the objective table.
According to the scheme, the installation heights of the belt wheel 1 and the belt wheel 2 on the motor rotating shaft and the objective table rotating shaft are the same.
A calibration method of an ultralow frequency triaxial nuclear power plant seismic accelerometer comprises the following steps:
s1: calibrating sensitivity; the sensor to be measured is fixed on the objective table along the direction that the Z axis is perpendicular to the horizontal plane, the rotation radius r of the sensor to be measured is read through the scale, the servo motor rotates at a fixed rotation speed omega, and the rotation period is t, the acceleration value a of the X axis applied to the sensor to be measured x And acceleration value a of Y axis y Respectively is
a x ＝rω 2 sinωt，
a y ＝rω 2 cosωt，
a z ＝0，
Let the acceleration actual value of the X axis output by the sensor to be measured be a x1 The actual value of the acceleration of the Y axis is a y1 Will a x1 And a x 、a y1 And a y Respectively comparing and calculating to obtain the sensitivity of the sensor to be detected;
loosening a locking bolt of the upper bearing, moving the upper bearing along the direction of the scale, changing the rotating radius r, and repeating sensitivity calibration to eliminate operation errors;
s2: calibrating frequency response; calculating an acceleration value a of the X-axis applied to the sensor to be measured according to the step S1 x And acceleration value a of Y axis y Let the acceleration actual value of the X axis output by the sensor to be measured be a x2 The actual value of the acceleration of the Y axis is a y2 Will a x2 And a x 、a y2 And a y Respectively comparing and calculating to obtain the frequency response of the sensor to be detected; the rotating speed omega of the servo motor is changed, and frequency response calibration is repeatedly carried out to eliminate operation errors.
Further, the method also comprises the following steps:
fixing the sensor to be measured on an objective table in sequence according to the directions of the X axis and the Y axis which are perpendicular to the horizontal plane, and calibrating sensitivity and frequency response to obtain an acceleration value a of the Z axis applied to the sensor to be measured z Is that
a z ＝rω 2 cosωt，
Outputting the acceleration actual value a of the sensor to be measured in the sensitivity calibration and the frequency response calibration respectively z1 And a z2 Respectively with a z And (5) comparing and calculating to obtain the sensitivity and the frequency response of the transverse axis of the sensor to be measured.
The beneficial effects of the invention are as follows:
1. according to the ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table and the calibration method, the rotary table support is driven to do circular motion through the servo motor and the motor rotating shaft, and the objective table rotating shaft and the objective table are driven to do reverse circular rotation with the same period through the two belt pulleys and the crossed transmission belt, so that azimuth angles of the objective table and the seismic accelerometer to be measured do not change in the rotating process, and the objective table and the seismic accelerometer to be measured are translated relative to the static ground; when the rotary table support rotates, a sine period-changing acceleration value is applied to the seismic accelerometer to be tested, and the testing function of precision and frequency response of the seismic accelerometer under ultralow frequency is realized. The invention can output a sine acceleration value with the frequency below 2Hz and the acceleration value being adjustable, meets the regulations of the 'NB/T20076 nuclear power station seismic instrument criterion', and fills the market blank.
2. The invention can change the input rotation radius under the fixed frequency to test the precision of the earthquake accelerometer, and also can change the input rotation speed, namely the frequency under the fixed rotation radius to test the frequency response of the earthquake accelerometer, thereby being convenient for simplifying the test flow and reducing the burden of testers.
3. The invention can test the precision and the frequency response performance of the three axial directions of the seismic accelerometer after changing the installation direction of the seismic accelerometer, has simple structure and is beneficial to reducing the test cost.
Drawings
Fig. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a top view of an embodiment of the present invention.
In the figure: 1. a base; 2. a servo motor; 3. a turntable support; 4. a motor shaft; 5. a pulley 1;6. a lower bearing; 7. a pulley 2;8. an objective table rotating shaft; 9. a transmission belt; 10. an upper bearing; 11. a rotating rod; 12. an objective table; 13. a ruler.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Referring to fig. 1 and 2, the ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table comprises a base 1, a servo motor 2, a rotary table support 3, a motor rotating shaft 4, a belt wheel 1 5, a lower bearing 6, a belt wheel 2 7, an objective table rotating shaft 8, a driving belt 9, an upper bearing 10, a rotating rod 11, an objective table 12, a scale 13 and a locking bolt.
The servo motor 2 is fixed on the base 1, the motor rotating shaft 4 is fixedly connected with a rotor of the servo motor 2, and the motor rotating shaft 4 is in a vertical direction.
The rotary rod 11 is perpendicular to the motor rotary shaft 4, the midpoint of the rotary rod 11 is fixed at the top of the motor rotary shaft 4, and the scale 13 is fixed at one side of the rotary rod 11 from the end point of any one end to the midpoint; the rotary table bracket 3 comprises a bracket cross bar and a bracket vertical bar which are mutually and vertically fixed; the support montant is fixed in the one end that does not have fixed scale 13 of rotary rod 11, and support montant is perpendicular with rotary rod 11, and the support horizontal pole is parallel with support horizontal pole rotary rod 11.
The upper bearing 10 is movably connected with the rotary rod 11, and the locking bolt is in threaded connection with the upper bearing 10; when the locking bolt is screwed down, the relative positions of the upper bearing 10 and the rotary rod 11 are fixed; when the lock bolt is released, the upper bearing 10 moves in the length direction of the rotating lever 11.
One end of the objective table rotating shaft 8, which is close to the top, is fixedly connected with a rotor of the upper bearing 10, the objective table 12 is fixed at the top of the objective table rotating shaft 8, and the seismic accelerometer to be measured is fixed on the upper surface of the objective table 12.
The rotor of lower bearing 6 is fixed connection with the one end of keeping away from the top of objective table pivot 8, and lower bearing 6 and the support horizontal pole swing joint of revolving stage support 3, and lower bearing 6 removes along the length direction of support horizontal pole.
The outer diameters of the belt pulley 1 5 and the belt pulley 2 7 are the same, the belt pulley 1 5 is sleeved on the motor rotating shaft 4 and is fixed with the motor rotating shaft 4, the belt pulley 2 7 is sleeved on the objective table rotating shaft 8 and is fixed with the objective table rotating shaft 8, and the mounting heights of the belt pulley 1 5 and the belt pulley 2 7 on the motor rotating shaft 4 and the objective table rotating shaft 8 are the same respectively; the driving belt 9 is 8-shaped and crossed and wound on the belt pulley 1 5 and the belt pulley 2 7, and the motor rotating shaft 4, the object stage rotating shaft 8, the belt pulley 1 5, the belt pulley 2 7 and the driving belt 9 form belt driving.
When the servo motor 2 rotates, the motor rotating shaft 4 drives the rotating rod 11 and the rotating table bracket 3 to do uniform circular motion by taking the motor rotating shaft 4 as the center; the belt wheel 1 5, the belt wheel 2 7 and the transmission belt 9 which is in a shape of 8 and is crosswise wound on the belt wheel 1 5 and the belt wheel 2 7 drive the objective table rotating shaft 8 and the objective table 12 to do reverse uniform circumferential rotation with the same period around the objective table rotating shaft 8, so that the azimuth angles of the objective table 12 and the seismic accelerometer to be measured are not changed in the rotating process, and the objective table is translated relative to the static ground; when the rotary rod 11 and the rotary table support 3 rotate, the method is equivalent to the step of applying a sine periodically-changing acceleration value to the seismic accelerometer to be tested to calibrate and test the seismic accelerometer.
A calibration method of an ultralow frequency triaxial nuclear power plant seismic accelerometer comprises the following steps:
s1: calibrating sensitivity; earthquake accelerometer to be measuredThe servo motor 2 rotates at a fixed rotation speed omega and the rotation period is t, and the acceleration value a applied to the X-axis of the seismic accelerometer to be measured and changed according to the sine period is applied x And acceleration value a of Y axis y Respectively is
a x ＝rω 2 sinωt，
a y ＝rω 2 cosωt，
a z ＝0，
Setting the actual value of the acceleration of the output X axis of the earthquake accelerometer to be measured as a x1 The actual value of the acceleration of the Y axis is a y1 Will a x1 And a x 、a y1 And a y Respectively comparing and calculating to obtain the sensitivity of the earthquake acceleration instrument to be measured;
loosening a locking bolt of the upper bearing 10, moving the upper bearing 10 along the direction of the scale 13, changing the rotation radius r, and repeating sensitivity calibration to eliminate operation errors;
s2: calibrating frequency response; calculating according to step S1 to obtain the acceleration value a of X-axis applied to the seismic accelerometer to be measured and changing according to sine period x And acceleration value a of Y axis y Setting the actual value of the acceleration of the output X axis of the earthquake accelerometer to be measured as a x2 The actual value of the acceleration of the Y axis is a y2 Will a x2 And a x 、a y2 And a y Respectively comparing and calculating to obtain the frequency response of the seismic accelerometer to be detected; the rotation speed omega of the servo motor 2 is changed, and frequency response calibration is repeatedly performed to eliminate operation errors.
The method comprises the steps of sequentially fixing an earthquake accelerometer to be measured on an objective table 12 according to the directions of an X axis and a Y axis which are perpendicular to a horizontal plane, and calibrating sensitivity and frequency response to obtain an acceleration value a of a Z axis which is applied to the earthquake accelerometer to be measured and varies according to sine cycles z Is that
a z ＝rω 2 cosωt，
The earthquake acceleration instrument to be measured is respectively calibrated in sensitivity and frequencyActual acceleration value a output in rate response calibration z1 And a z2 Respectively with a z And (5) comparing and calculating to obtain the sensitivity and the frequency response of the transverse axis of the seismic accelerometer to be measured.
The magnitude and frequency of the acceleration applied to the seismic accelerometer to be measured are determined by the rotation radius r and the rotation speed omega, the smaller the rotation speed omega is, the lower the frequency is, the rotation radius r and the rotation speed omega are changed, and the standard low-frequency sinusoidal acceleration value can be output for calibrating and testing the precision and the frequency response of the seismic accelerometer. The invention can output a sine acceleration value with the frequency below 2Hz and the acceleration value being adjustable, meets the regulations of the 'NB/T20076 nuclear power station seismic instrument criterion', and fills the market blank.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (6)
1. An ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table which is characterized in that: comprises a servo motor (2), a motor rotating shaft (4), a scale (13), an upper bearing (10), an objective table rotating shaft (8), a belt pulley 1 (5), a belt pulley 2 (7) and a driving belt (9); the motor rotating shaft (4) is fixedly connected with a rotor of the servo motor (2), and the motor rotating shaft (4) is in a vertical direction; one end of the scale (13) is fixed at the top of the motor rotating shaft (4), and the scale (13) is perpendicular to the motor rotating shaft (4); the upper bearing (10) is movably connected with the scale (13), and the upper bearing (10) moves along the length direction of the scale (13); one end, close to the top, of the objective table rotating shaft (8) is fixedly connected with a rotor of the upper bearing (10), and the top of the objective table rotating shaft (8) is fixedly connected with a sensor to be detected; the belt pulley 1 (5) and the belt pulley 2 (7) have the same outer diameter, the belt pulley 1 (5) is sleeved on the motor rotating shaft (4) and is fixed with the motor rotating shaft (4), the belt pulley 2 (7) is sleeved on the object stage rotating shaft (8) and is fixed with the object stage rotating shaft (8), the transmission belt (9) is wound on the belt pulley 1 (5) and the belt pulley 2 (7) in a 8-shaped cross manner, and the motor rotating shaft (4), the object stage rotating shaft (8), the belt pulley 1 (5), the belt pulley 2 (7) and the transmission belt (9) form belt transmission; the motor is characterized by further comprising a rotating rod (11), wherein the rotating rod (11) is perpendicular to the motor rotating shaft (4), the midpoint of the rotating rod (11) is fixed at the top of the motor rotating shaft (4), and the scale (13) is fixed at one side of the rotating rod (11) from the end point of any one end to the midpoint;
the turntable comprises a turntable support (3), wherein the turntable support (3) comprises a support cross rod and a support vertical rod which are fixed mutually vertically; the support vertical rod is fixed at one end of the rotating rod (11) without the fixed scale (13), the support vertical rod is vertical to the rotating rod (11), and the support cross rod is parallel to the rotating rod (11);
the rotary table also comprises a lower bearing (6), wherein a rotor of the lower bearing (6) is fixedly connected with one end, far away from the top, of the objective table rotating shaft (8), the lower bearing (6) is movably connected with a support cross rod of the rotary table support (3), and the lower bearing (6) moves along the length direction of the support cross rod;
the belt wheel 1 (5) and the belt wheel 2 (7) are respectively arranged on the motor rotating shaft (4) and the objective table rotating shaft (8) at the same installation height.
2. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table according to claim 1, wherein: the servo motor (2) is fixed on the base (1).
3. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table according to claim 1, wherein: the device also comprises a locking bolt which is in threaded connection with the upper bearing (10); when the locking bolt is screwed down, the relative positions of the upper bearing (10) and the scale (13) are fixed; when the lock bolt is released, the upper bearing (10) moves along the length direction of the scale (13).
4. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table according to claim 1, wherein: the sensor to be measured is fixed on the upper surface of the objective table (12).
5. The method for calibrating the ultralow frequency triaxial nuclear power plant seismic accelerometer calibration table based on any one of claims 1 to 4 is characterized by comprising the following steps: the method comprises the following steps:
s1: calibrating sensitivity; the sensor to be measured is fixed on an objective table (12) along the direction that the Z axis is perpendicular to the horizontal plane, the rotation radius r of the sensor to be measured is read through a scale (13), a servo motor (2) rotates at a fixed rotation speed omega, and the rotation period is t, so that the acceleration value a of the X axis applied to the sensor to be measured x And acceleration value a of Y axis y Respectively is
a x ＝rω 2 sinωt，
a y ＝rω 2 cosωt，
a z ＝0，
Let the acceleration actual value of the X axis output by the sensor to be measured be a x1 The actual value of the acceleration of the Y axis is a y1 Will a x1 And a x 、a y1 And a y Respectively comparing and calculating to obtain the sensitivity of the sensor to be detected;
loosening a locking bolt of the upper bearing (10), moving the upper bearing (10) along the direction of the scale (13), changing the rotating radius r, and repeating sensitivity calibration to eliminate operation errors;
s2: calibrating frequency response; calculating an acceleration value a of the X-axis applied to the sensor to be measured according to the step S1 x And acceleration value a of Y axis y Let the acceleration actual value of the X axis output by the sensor to be measured be a x2 The actual value of the acceleration of the Y axis is a y2 Will a x2 And a x 、a y2 And a y Respectively comparing and calculating to obtain the frequency response of the sensor to be detected; the rotating speed omega of the servo motor (2) is changed, and frequency response calibration is repeatedly carried out to eliminate operation errors.
6. The calibration method according to claim 5, characterized in that: the method also comprises the following steps:
fixing the sensor to be measured on an objective table (12) according to the directions of the X axis and the Y axis which are perpendicular to the horizontal plane in sequence, and calibrating sensitivity and frequency response to obtain a Z axis applied to the sensor to be measuredAcceleration value a of (2) z Is that
a z ＝rω 2 cosωt，
Outputting the acceleration actual value a of the sensor to be measured in the sensitivity calibration and the frequency response calibration respectively z1 And a z2 Respectively with a z And (5) comparing and calculating to obtain the sensitivity and the frequency response of the transverse axis of the sensor to be measured.
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| CN111781399A (en) * | 2020-07-06 | 2020-10-16 | 广东工业大学 | Simulation test platform for acceleration sensor |
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