CN111257594A - Ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration platform and calibration method - Google Patents
Ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration platform and calibration method Download PDFInfo
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Abstract
The invention provides a calibration platform and a calibration method for an ultra-low frequency triaxial nuclear power plant seismic accelerometer, wherein a rotating platform 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 wheels and an intersecting driving belt to do reverse circular rotation with the same period, so that the azimuth angles of the objective table and the seismic accelerometer to be tested do not change in the rotating process and are translated relative to the static ground; when the rotating platform support rotates, a sine periodically-changing acceleration value is applied to the seismic accelerometer to be tested, so that the test function of the precision and frequency response of the seismic accelerometer under the ultralow frequency is realized; the invention can output sine acceleration value with frequency below 2Hz and adjustable acceleration value, meets the regulation of 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 the tester.
Description
Technical Field
The invention belongs to the technical field of sensor calibration, and particularly relates to an ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration platform 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 criteria of nuclear power plant seismic instruments of NB/T20076, in each power plant overhaul period, a seismic instrument system operated by a nuclear power plant must be shut down for overhaul maintenance detection, channel calibration of the system is completed, calibration and inspection are carried out on the seismic accelerometer component, and performance characteristics such as precision, frequency response and the like are tested.
The nuclear power plant seismic accelerometer standard of NB/T20076 specifies that the working frequency range specified by the nuclear power plant seismic accelerometer is 0.02 Hz-50 Hz, and when calibrating seismic accelerometer components, the frequency response of a sensor and the acceleration response sensitivity and the horizontal axis sensitivity under a given frequency must be detected. At the present stage, the calibration of the seismic accelerometer is carried out by adopting seismic stations, the lower limit of the frequency of the mainstream seismic stations in the market is mostly above 5Hz, and a few seismic stations can reach 2Hz, but the calibration and measurement requirements of the specifications on the nuclear power station seismic accelerometer cannot be met.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the calibration platform and the calibration method are used for realizing the test function of the precision and the frequency response of the seismic accelerometer under the ultralow frequency.
The technical scheme adopted by the invention for solving the technical problems is as follows: an ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration platform comprises a servo motor, a motor rotating shaft, a scale, an upper bearing, an objective table rotating shaft, a belt wheel 1, a belt wheel 2 and a transmission belt; the motor rotating shaft is fixedly connected with a rotor of the servo motor and is in a vertical direction; one end of the scale is fixed on the top of the motor rotating shaft, and the scale is vertical 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 object stage rotating shaft close to the top is fixedly connected with a rotor of the upper bearing, and the top of the object stage rotating shaft is fixedly connected with the sensor to be measured; the belt wheel 1 and the belt wheel 2 are identical in outer diameter, the belt wheel 1 is sleeved on the motor rotating shaft and fixed with the motor rotating shaft, the belt wheel 2 is sleeved on the objective table rotating shaft and fixed with the objective table rotating shaft, the transmission belt is wound on the belt wheel 1 and the belt wheel 2 in a 8-shaped cross mode, and the motor rotating shaft, the objective table rotating shaft, the belt wheel 1, the belt wheel 2 and the transmission belt form belt transmission.
According to the scheme, the device further comprises a base, and the servo motor is fixed on the base.
According to the scheme, the device further comprises a rotating rod, the 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 end point of any end to the midpoint.
The rotary table support comprises a support cross rod and a support vertical rod which are vertically fixed with each other; the support vertical rod is fixed at one end of the rotary rod, which is not provided with a fixed scale, the support vertical rod is vertical to the rotary rod, and the support cross rod is parallel to the rotary rod of the support cross rod.
Further, still include the lower bearing, the rotor of lower bearing and the one end fixed connection who keeps away from the top of objective table pivot, lower bearing and the support horizontal pole swing joint of revolving stage support, the length direction removal of lower bearing along the support horizontal pole.
According to the scheme, the locking device 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 position of the upper bearing and the scale is fixed; when the locking bolt is loosened, the upper bearing moves in the length direction of the scale.
According to the scheme, the device further comprises an objective table, the objective table is fixed to the top of the objective table rotating shaft, and the sensor to be measured is fixed to the upper surface of the objective table.
According to the scheme, the belt wheel 1 and the belt wheel 2 are respectively arranged at the same height on the motor rotating shaft and the object stage rotating shaft.
A calibration method for an ultra-low frequency triaxial nuclear power plant seismic accelerometer comprises the following steps:
s1: calibrating the sensitivity; fixing the sensor to be measured on an objective table in a direction that a Z axis is vertical to a horizontal plane, reading the rotating radius r of the sensor to be measured through a scale, rotating a servo motor at a fixed rotating speed omega with a rotating period of t, and applying an acceleration value a of an X axis on the sensor to be measuredxAnd acceleration value a of Y-axisyAre respectively as
ax＝rω2sinωt，
ay＝rω2cosωt，
az＝0，
Setting the actual acceleration value of the sensor to be measured to output an X axis as ax1The actual acceleration value of the Y axis is ay1A is tox1And ax、ay1And ayRespectively carrying out contrast calculation to obtain the sensitivity of the sensor to be measured;
loosening a locking bolt of the upper bearing, moving the upper bearing along the direction of the scale, changing the rotating radius r, and repeatedly carrying out sensitivity calibration to eliminate operation errors;
s2: calibrating the frequency response; an acceleration value a of the X-axis applied to the sensor to be measured is calculated as step S1xAnd acceleration value a of Y-axisySetting the actual acceleration value of the X axis output by the sensor to be measured as ax2The actual acceleration value of the Y axis is ay2A is tox2And ax、ay2And ayRespectively carrying out comparison calculation to obtain the frequency response of the sensor to be measured; and changing the rotation speed omega of the servo motor, and repeatedly carrying out frequency response calibration 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 vertical to the horizontal plane, and carrying out sensitivity calibration and frequency response calibration to obtain the acceleration value a of the Z axis applied to the sensor to be measuredzIs composed of
az＝rω2cosωt，
The acceleration actual value a output by the sensor to be measured in the sensitivity calibration and the frequency response calibration respectivelyz1And az2Are respectively connected withazAnd (5) comparing and calculating to obtain the sensitivity and frequency response of the transverse axis of the sensor to be measured.
The invention has the beneficial effects that:
1. the invention relates to a calibration platform and a calibration method for an ultra-low frequency triaxial nuclear power plant seismic accelerometer, wherein a rotating platform 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 wheels and an intersecting driving belt to do reverse circular rotation with the same period, so that the azimuth angles of the objective table and the seismic accelerometer to be measured do not change in the rotating process and are translated relative to the static ground; when the rotating platform support rotates, a sine periodically-changing acceleration value is applied to the seismic accelerometer to be tested, and the test function of the precision and frequency response of the seismic accelerometer under the ultralow frequency is realized. The invention can output sine acceleration value with frequency below 2Hz and adjustable acceleration value, meets the regulation of 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 seismic accelerometer, and can also change the input rotation speed, namely the frequency, under the fixed rotation radius to test the frequency response of the seismic accelerometer, thereby facilitating the simplification of 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 rotating table bracket; 4. a motor shaft; 5. a pulley 1; 6. a lower bearing; 7. a pulley 2; 8. a stage rotating shaft; 9. a transmission belt; 10. an upper bearing; 11. rotating the rod; 12. an object stage; 13. and (4) a scale.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration platform comprises a base 1, a servo motor 2, a rotary table support 3, a motor rotating shaft 4, a belt wheel 15, a lower bearing 6, a belt wheel 27, an objective table rotating shaft 8, a transmission belt 9, an upper bearing 10, a rotating rod 11, an objective table 12, a scale 13 and a locking bolt.
Servo motor 2 is fixed on base 1, motor shaft 4 and servo motor 2's rotor fixed connection, motor shaft 4 is vertical direction.
The rotating rod 11 is vertical 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 on one side of the rotating rod 11 from the end point of any end to the midpoint; the rotating platform support 3 comprises a support cross rod and a support vertical rod which are vertically fixed with each other; the support vertical rod is fixed at one end of the rotating rod 11 without the fixed scale 13, the support vertical rod is perpendicular to the rotating rod 11, and the support cross rod is parallel to the support cross rod rotating rod 11.
The upper bearing 10 is movably connected with the rotating rod 11, and the locking bolt is in threaded connection with the upper bearing 10; when the locking bolt is tightened, the relative positions of the upper bearing 10 and the rotating rod 11 are fixed; when the locking bolt is loosened, the upper bearing 10 moves in the length direction of the rotating rod 11.
One end of the objective table rotating shaft 8 close to the top is fixedly connected with the 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 tested is fixed on the upper surface of the objective table 12.
The rotor of lower bearing 6 and the one end fixed connection who keeps away from the top of objective table pivot 8, lower bearing 6 and the support horizontal pole swing joint of revolving stage support 3, lower bearing 6 removes along the length direction of support horizontal pole.
The belt wheel 15 and the belt wheel 27 have the same outer diameter, the belt wheel 15 is sleeved on the motor rotating shaft 4 and is fixed with the motor rotating shaft 4, the belt wheel 27 is sleeved on the objective table rotating shaft 8 and is fixed with the objective table rotating shaft 8, and the belt wheel 15 and the belt wheel 27 are respectively arranged on the motor rotating shaft 4 and the objective table rotating shaft 8 at the same height; the transmission belt 9 is wound on the belt wheel 15 and the belt wheel 27 in a 8-shaped crossed manner, and the motor rotating shaft 4, the objective table rotating shaft 8, the belt wheel 15, the belt wheel 27 and the transmission belt 9 form belt transmission.
When the servo motor 2 rotates, the motor rotating shaft 4 drives the rotating rod 11 and the rotating platform bracket 3 to do uniform circular motion by taking the motor rotating shaft 4 as the center; the object stage rotating shaft 8 and the object stage 12 are driven to do reverse uniform-speed circumferential rotation with the same period around the object stage rotating shaft 8 through the belt wheel 15, the belt wheel 27 and the 8-shaped transmission belt 9 which is crossly wound on the belt wheel 15 and the belt wheel 27, so that the azimuth angles of the object stage 12 and the seismic accelerometer to be measured do not change in the rotating process and move horizontally relative to the static ground; when the rotating rod 11 and the rotating platform support 3 rotate, the acceleration value with sine periodic change is applied to the seismic accelerometer to be tested to perform calibration test on the seismic accelerometer.
A calibration method for an ultra-low frequency triaxial nuclear power plant seismic accelerometer comprises the following steps:
s1: calibrating the sensitivity; fixing the seismic accelerometer to be tested on an objective table 12 along a direction that a Z axis is vertical to a horizontal plane, reading the rotation radius r of the seismic accelerometer to be tested through a scale 13, rotating a servo motor 2 at a fixed rotation speed omega with a rotation period t, and applying an acceleration value a which changes according to a sine cycle and is along an X axis on the seismic accelerometer to be testedxAnd acceleration value a of Y-axisyAre respectively as
ax＝rω2sinωt，
ay＝rω2cosωt，
az＝0，
Setting the actual acceleration value of the X axis output by the seismic accelerometer to be tested as ax1The actual acceleration value of the Y axis is ay1A is tox1And ax、ay1And ayRespectively carrying out comparison calculation to obtain the sensitivity of the seismic accelerometer to be detected;
loosening the 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 repeatedly carrying out sensitivity calibration to eliminate operation errors;
s2: calibrating the frequency response; calculating according to the step S1 to obtain the correction applied to the seismic accelerometer to be measuredAcceleration a of the X-axis with periodic variations of the chordxAnd acceleration value a of Y-axisySetting the actual acceleration value of the X axis output by the seismic accelerometer to be measured as ax2The actual acceleration value of the Y axis is ay2A is tox2And ax、ay2And ayRespectively carrying out comparison calculation to obtain the frequency response of the seismic accelerometer to be detected; and changing the rotating speed omega of the servo motor 2, and repeatedly carrying out frequency response calibration to eliminate operation errors.
Fixing the seismic accelerometer to be tested on the objective table 12 in the directions of the X axis and the Y axis perpendicular to the horizontal plane in sequence, and performing sensitivity calibration and frequency response calibration to obtain the Z-axis acceleration value a which is applied to the seismic accelerometer to be tested and changes according to sine periodzIs composed of
az＝rω2cosωt，
The actual acceleration value a output by the seismic accelerometer to be tested in the sensitivity calibration and the frequency response calibration respectivelyz1And az2Are respectively connected with azAnd (5) comparing and calculating to obtain the sensitivity and frequency response of the transverse shaft of the seismic accelerometer to be measured.
The acceleration and the frequency applied to the seismic accelerometer to be tested 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 then the standard low-frequency sinusoidal acceleration value can be output to be used for carrying out calibration test on the precision and the frequency response of the seismic accelerometer. The invention can output sine acceleration value with frequency below 2Hz and adjustable acceleration value, meets the regulation of NB/T20076 nuclear power station seismic instrument criterion, and fills the market blank.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an ultralow frequency triaxial nuclear power plant seismic accelerometer calibration platform which characterized in that: comprises a servo motor (2), a motor rotating shaft (4), a scale (13), an upper bearing (10), an object stage rotating shaft (8), a belt wheel (1), (5), a belt wheel (2), (7) and a transmission 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 the vertical direction; one end of the scale (13) is fixed on the top of the motor rotating shaft (4), and the scale (13) is vertical 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 of the objective table rotating shaft (8) close to the top 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 measured; the belt wheels 1 and 5 and the belt wheels 2 and 7 have the same outer diameter, the belt wheels 1 and 5 are sleeved on the motor rotating shaft 4 and fixed with the motor rotating shaft 4, the belt wheels 2 and 7 are sleeved on the objective table rotating shaft 8 and fixed with the objective table rotating shaft 8, the transmission belt 9 is wound on the belt wheels 1 and 5 and the belt wheels 2 and 7 in an 8-shaped crossed manner, and the motor rotating shaft 4, the objective table rotating shaft 8, the belt wheels 1 and 5, the belt wheels 2 and 7 and the transmission belt 9 form belt transmission.
2. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table of claim 1, which is characterized in that: the servo motor is characterized by further comprising a base (1), and the servo motor (2) is fixed on the base (1).
3. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table of claim 1, which is characterized in that: the motor rotating shaft device is characterized by further comprising a rotating rod (11), the rotating rod (11) is perpendicular to the motor rotating shaft (4), the middle point of the rotating rod (11) is fixed to the top of the motor rotating shaft (4), and a scale (13) is fixed to one side, from the end point of any end of the rotating rod (11) to the middle point, of the rotating rod.
4. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table according to claim 3, wherein: the rotary table support (3) comprises a support cross rod and a support vertical rod which are vertically fixed with each other; the support vertical rod is fixed at one end of the rotating rod (11) without the fixed scale (13), the support vertical rod is perpendicular to the rotating rod (11), and the support cross rod is parallel to the support cross rod rotating rod (11).
5. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table according to claim 4, wherein: the lower bearing (6) is fixedly connected with one end, far away from the top, of the object stage rotating shaft (8), of a rotor of the lower bearing (6), the lower bearing (6) is movably connected with the support cross rod of the rotating table support (3), and the lower bearing (6) moves along the length direction of the support cross rod.
6. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table of claim 1, which is characterized in that: the locking bolt is in threaded connection with the upper bearing (10); when the locking bolt is screwed down, the relative position of the upper bearing (10) and the scale (13) is fixed; when the locking bolt is loosened, the upper bearing (10) moves in the length direction of the scale (13).
7. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table of claim 1, which is characterized in that: the device is characterized by further comprising an object stage (12), wherein the object stage (12) is fixed to the top of the object stage rotating shaft (8), and the sensor to be measured is fixed to the upper surface of the object stage (12).
8. The ultra-low frequency triaxial nuclear power plant seismic accelerometer calibration table of claim 1, which is characterized in that: the belt wheels 1(5) and 2(7) are respectively arranged at the same height on the motor rotating shaft (4) and the object stage rotating shaft (8).
9. The method for calibrating the calibration stand of the seismic accelerometer of the ultralow-frequency triaxial nuclear power plant based on any one of claims 1 to 8 is characterized by comprising the following steps of: the method comprises the following steps:
s1: calibrating the sensitivity; fixing a sensor to be measured on an objective table (12) according to the direction that the Z axis is vertical to the horizontal plane, reading the rotating radius r of the sensor to be measured through a scale (13), rotating a servo motor (2) according to a fixed rotating speed omega with a rotating period of t, and applying the acceleration value a of the X axis on the sensor to be measuredxAnd acceleration value a of Y-axisyAre respectively as
ax＝rω2sinωt，
ay＝rω2cosωt，
az＝0，
Setting the actual acceleration value of the sensor to be measured to output an X axis as ax1The actual acceleration value of the Y axis is ay1A is tox1And ax、ay1And ayRespectively carrying out contrast calculation to obtain the sensitivity of the sensor 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 rotating radius r, and repeatedly carrying out sensitivity calibration to eliminate operation errors;
s2: calibrating the frequency response; an acceleration value a of the X-axis applied to the sensor to be measured is calculated as step S1xAnd acceleration value a of Y-axisySetting the actual acceleration value of the X axis output by the sensor to be measured as ax2The actual acceleration value of the Y axis is ay2A is tox2And ax、ay2And ayRespectively carrying out comparison calculation to obtain the frequency response of the sensor to be measured; and changing the rotation speed omega of the servo motor (2), and repeatedly carrying out frequency response calibration to eliminate operation errors.
10. The calibration method according to claim 9, wherein: further comprising the steps of:
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 vertical to the horizontal plane in sequence, and carrying out sensitivity calibration and frequency response calibration to obtain the acceleration value a of the Z axis applied to the sensor to be measuredzIs composed of
az＝rω2cosωt，
The acceleration actual value a output by the sensor to be measured in the sensitivity calibration and the frequency response calibration respectivelyz1And az2Are respectively connected with azAnd (5) comparing and calculating to obtain the sensitivity and frequency response of the transverse axis of the sensor to be measured.
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