CN111649890A - Method and device for controlling vibration table - Google Patents
Method and device for controlling vibration table Download PDFInfo
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- CN111649890A CN111649890A CN202010606420.XA CN202010606420A CN111649890A CN 111649890 A CN111649890 A CN 111649890A CN 202010606420 A CN202010606420 A CN 202010606420A CN 111649890 A CN111649890 A CN 111649890A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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Abstract
The invention discloses a control method and a device of a vibration table, wherein the control method comprises the following steps: continuously acquiring a plurality of position information of the moving coil sent by the position sensor; acquiring the central position of the moving coil based on the position information; when the central position is determined to be above a preset central position, the air pump is controlled to pump air from the inner cavity, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is; and when the central position is determined to be below the preset central position, controlling the air pump to inflate from the inner cavity, wherein the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger. Therefore, the vibration control device can adapt to the change of the air pressure of the surrounding environment and is convenient for accurately controlling the vibration of the moving coil.
Description
Technical Field
The invention relates to the technical field of mechanical environment test equipment, in particular to a control method and a control device for a vibration table.
Background
The oscillating table can simulate various environmental vibrations encountered by a product during manufacture, assembly, transportation and use, and is used for identifying whether the product can endure the environmental vibrations, and the structure of the oscillating table is generally shown in fig. 1 and comprises: the pressure-bearing table comprises a pressure-bearing table body 1 with an inner cavity 11, a moving coil 2 arranged in the inner cavity 11 and a driving device, wherein the driving device can drive and adjust the vibration of the moving coil 2. Furthermore, air is typically used to flow through the inner cavity 11, it being understood that the upper end face of the inner ring 2 is subjected to a downward pressure of air in the surrounding environment (as indicated by the solid arrows in the figure) and the lower end face is subjected to an upward pressure of air in the inner cavity 11 (as indicated by the dashed arrows in the figure). It will be appreciated that when the ambient air pressure is greater than the air pressure in the cavity 11, the moving coil 2 is subjected to a downward thrust, otherwise, if the air pressure in the cavity 11 is greater than the ambient air pressure, the moving coil 2 is subjected to an upward thrust, which is disadvantageous for accurately controlling the vibration of the moving coil 2. In addition, it is possible to cause the moving parts in the drive to be subjected to impacts, and when such impacts are not balanced in time, the moving coil will be displaced from the central position until the device protection is triggered, and the vibration test is tested.
When the aircraft is flying at high altitude, it is usually in a relatively low pressure environment, when the aircraft is parked at a ground airport, it is usually in a relatively high pressure environment, and when taking off or landing, the change of the air pressure of the environment in which the aircraft is located is usually large and fast, so that when the vibration test is performed on the aircraft and its related components, the aircraft, the related components and the vibrating table need to be put into a closed space, and the air pressure in the closed space needs to be adjusted quickly, which can be understood to cause a sudden change of the thrust force received by the moving coil 2, thereby causing an inability to accurately control the vibration of the moving coil 2.
Disclosure of Invention
In view of the above, the present invention is directed to a method and an apparatus for controlling a vibration table.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a control method of a vibration table comprises a pressure-bearing table body with an inner cavity, a moving coil arranged in the inner cavity, a position sensor for acquiring the position of the moving coil in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity, wherein the moving coil penetrates out of an upper side shell of the inner cavity and can vibrate vertically relative to the pressure-bearing table body, and the lower end surface of the moving coil is always positioned in the inner cavity in the vibration process; the method comprises the following steps: continuously acquiring a plurality of position information of the moving coil sent by the position sensor; acquiring the central position of the moving coil based on the position information; when the central position is determined to be above a preset central position, the air pump is controlled to pump air from the inner cavity, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is; and when the central position is determined to be below the preset central position, controlling the air pump to inflate from the inner cavity, wherein the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger.
As an improvement of the embodiment of the present invention, the step of "the greater the absolute value of the difference between the center position and the preset center position, the faster the pumping speed" includes: when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped; when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value; when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
As an improvement of the embodiment of the present invention, the "the larger the absolute value of the difference between the center position and the preset center position is, the faster the inflation speed" includes: when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out; when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value; when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
As an improvement of the embodiment of the present invention, the position sensor includes: two groove-shaped photoelectric switches fixed in the inner cavity and a vertical baffle fixed on the moving coil; the two groove-shaped photoelectric switches are distributed vertically, each groove-shaped photoelectric switch is provided with a groove extending along the vertical direction, and the extending lines of the two grooves are the same vertical line; the distance between the two grooves is equal to the distance between the upper end part and the lower end part of the vertical baffle; when the center position of the moving coil is positioned at the preset center position, the upper end part of the vertical baffle is inserted into the groove at the upper side, and the lower end part of the vertical baffle is inserted into the groove at the lower side; when the center position of the moving coil is lower than the preset center position, the vertical baffle is only inserted into the groove at the lower side; when the center position of the moving coil is higher than the preset center position, the vertical baffle is only inserted into the groove at the upper side; the "acquiring the plurality of pieces of position information of the moving coil sent by the position sensor" specifically includes: acquiring a time T1 when the upper end is inserted into the upper groove and a time T2 when the lower end is inserted into the lower groove in a preset time period T; the "acquiring the center position of the moving coil based on the plurality of pieces of position information" specifically includes: the center position of the moving coil is obtained based on T, T1 and T2.
The embodiment of the invention also provides a control device of the vibrating table, the vibrating table comprises a pressure-bearing table body with an inner cavity, a moving coil arranged in the inner cavity, a position sensor for acquiring the position of the moving coil in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity, wherein the moving coil penetrates out of the upper side shell of the inner cavity and can vibrate up and down relative to the pressure-bearing table body; the system comprises the following modules: the position information acquisition module is used for continuously acquiring a plurality of pieces of position information of the moving coil, which is sent by the position sensor; the central position generating module is used for acquiring the central position of the moving coil based on the position information; the first processing module is used for controlling the air pump to pump air from the inner cavity when the central position is determined to be above a preset central position, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is; and the second processing module is used for controlling the air pump to inflate from the inner cavity when the central position is determined to be below the preset central position, and the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger.
As an improvement of the embodiment of the present invention, the first processing module is further configured to: when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped; when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value; when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
As an improvement of the embodiment of the present invention, the second processing module is further configured to: when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out; when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value; when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
As an improvement of the embodiment of the present invention, the position sensor includes: two groove-shaped photoelectric switches fixed in the inner cavity and a vertical baffle fixed on the moving coil; the two groove-shaped photoelectric switches are distributed up and down, each groove-shaped photoelectric switch is provided with a groove extending along the up-down direction, and the two grooves are positioned on the same vertical line; the distance between the two grooves is equal to the distance between the upper end part and the lower end part of the vertical baffle plate, and when the center position of the moving coil is positioned at the preset center position, the upper end part of the vertical baffle plate is inserted into the groove at the upper side, and the lower end part of the vertical baffle plate is inserted into the groove at the lower side; when the center position of the moving coil is lower than the preset center position, the vertical baffle is only inserted into the groove at the lower side; when the center position of the moving coil is higher than the preset center position, the vertical baffle is only inserted into the groove at the upper side;
the position information obtaining module is further configured to: acquiring a time T1 when the upper end is inserted into the upper groove and a time T2 when the lower end is inserted into the lower groove in a preset time period T;
the central location generation module is further to: the center position of the moving coil is obtained based on T, T1 and T2.
The control method and the device for the vibrating table provided by the embodiment of the invention have the following advantages: the embodiment of the invention discloses a control method and a device of a vibration table, wherein the control method comprises the following steps: continuously acquiring a plurality of position information of the moving coil sent by the position sensor; acquiring the central position of the moving coil based on the position information; when the central position is determined to be above a preset central position, the air pump is controlled to pump air from the inner cavity, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is; and when the central position is determined to be below the preset central position, controlling the air pump to inflate from the inner cavity, wherein the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger. Therefore, the vibration control device can adapt to the change of the air pressure of the surrounding environment and is convenient for accurately controlling the vibration of the moving coil.
Drawings
FIG. 1 is a schematic structural diagram of a vibration table according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for controlling a vibration table according to an embodiment of the present invention;
fig. 3A, 3B, and 3C are schematic structural views of a position sensor in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the embodiment, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the embodiment are included in the scope of the present invention.
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "electrically connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communication between two elements, direct connection, and indirect connection via an intermediary, where the specific meaning of the terms is understood by those skilled in the art as appropriate.
The embodiment of the invention provides a control method for a vibrating table, wherein the vibrating table comprises a pressure-bearing table body 1 with an inner cavity 11, a moving coil 2 arranged in the inner cavity 11, a position sensor for acquiring the position of the moving coil 2 in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity 11, wherein the moving coil 2 penetrates out of an upper side shell of the inner cavity 11 and can vibrate up and down relative to the pressure-bearing table body 1, and the lower end surface of the moving coil 2 is always positioned in the inner cavity 11 in the vibration process;
here, a magnetic induction coil may be wound on the outer surface of the moving coil 2, and a magnet may be further provided in the cavity 11, and it is understood that the vibration of the moving coil 2 can be driven and adjusted by adjusting parameters such as the magnitude, direction, and frequency of the current passing through the magnetic induction coil, and the vibration can be precisely controlled. Here, when a certain vibration test is performed, it is desirable that: the top end surface is subjected to downward pressure of air in the surrounding environment, namely the bottom end surface is subjected to upward pressure of air in the inner cavity 11, and at the moment, when the moving coil 2 vibrates, the center position of the moving coil is the preset center position; when the top end surface is subjected to the downward pressure of the air in the surrounding environment < the bottom end surface is subjected to the upward pressure of the air in the inner cavity 11, the center position of the moving coil 2 must move upward when the moving coil vibrates, and the larger the absolute value of the difference between the downward pressure and the upward pressure, the larger the upward movement distance; similarly, when the top end is subjected to the downward pressure of the air in the surrounding environment > the bottom end is subjected to the upward pressure of the air in the cavity 11, the center position of the moving coil 2 must move downward when it vibrates, and the larger the absolute value of the difference between the downward pressure and the upward pressure, the larger the distance of the downward movement.
Alternatively, the position sensor is a non-contact position sensor, and here, since the moving coil 2 is constantly in a high-frequency, high-speed, and high-acceleration vibration state, the non-contact position sensor can improve the detection accuracy. For example, a noncontact position sensor based on the hall principle, an ultrasonic position sensor, a photoelectric sensor, and the like.
Here, an executing device may be provided in the vibration table, the executing device may be a software module, a hardware module or a combination of software and hardware, and the executing device executes the control method, and optionally, the executing device may execute the control method once every preset time period T1.
As shown in fig. 2, the method comprises the following steps:
step 201: continuously acquiring a plurality of pieces of position information of the moving coil 2 sent by the position sensor; alternatively, the position sensor may acquire the position information of the moving coil 2 at preset time intervals, and the position information may be continuous position information. Here, the position sensor can convert the position of the moving coil 2 into a position electrical signal, and then process the position electrical signal, including isolation, filtering, amplification, and the like, to obtain position information.
Step 202: acquiring the central position of the moving coil 2 based on the position information;
step 203: when the central position is determined to be above the preset central position, the air pump is controlled to pump air from the inner cavity 11, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is; here, when the center position is located above the preset center position, it indicates that the moving coil 2 is subjected to an upward thrust, that is, the air pressure in the inner cavity 11 is greater than the air pressure in the surrounding environment, and the larger the absolute value of the difference between the center position and the preset center position is, the larger the difference between the air pressure in the inner cavity 11 and the air pressure in the surrounding environment is, the faster the air suction speed needs to be, so that the pressure can be reduced more quickly. Here, optionally, the "controlling the air pump to pump air from the inner cavity 11" specifically includes: controlling the air pump to pump air from the inner cavity 11 for a time period, wherein the length of the time period may be less than a preset time period T1; in addition, in practical use, the length of the time period may be set according to practical situations, for example: the larger the volume of the cavity 11, the longer the length of the time period. Optionally, the air pumping speed is | central position — preset central position |. a + b, where a >0, and b is greater than or equal to 0.
Step 204: when the central position is determined to be below the preset central position, the air pump is controlled to inflate from the inner cavity 11, and the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger. Here, when the center position is located below the preset center position, it means that the moving coil 2 is subjected to a downward thrust, that is, the air pressure in the cavity 11 is smaller than the air pressure of the surrounding environment, and the larger the absolute value of the difference between the center position and the preset center position is, it means that the larger the difference between the air pressure in the cavity 11 and the air pressure in the surrounding environment is, the faster the inflation speed needs to be, thereby enabling a more rapid pressurization. Here, optionally, the "controlling the air pump to inflate from the inner cavity 11" specifically includes: controlling the air pump to inflate from the inner cavity 11 for a time period, wherein the length of the time period may be less than a preset time period T1; in addition, in practical use, the length of the time period may be set according to practical situations, for example: the larger the volume of the cavity 11, the longer the length of the time period. Optionally, the inflation speed ═ center position — preset center position | × c + d, where c >0 and d ≧ 0.
Here, as shown in fig. 1, an inlet 12A and an outlet 12B are generally provided on the wall of the inner cavity 11, and air flows into the inner cavity 11 through the inlet 12A, and then flows out from the outlet 12B, then "inflating" may be specifically: (1) reducing the velocity of the air flowing out of the outlet 12B; (2) increasing the velocity of the air flowing in from the inlet 12A. The "air extraction" may specifically be: (1) increasing the velocity of the air flowing out of the outlet 12B; (2) the inflow speed of the air from the inlet 12A is reduced. Alternatively, a positive source of gas pressure may be provided at the inlet 12A, the pressure of which is greater than the pressure in the cavity 11 at any one time, and similarly, a negative source of gas pressure may be provided at the outlet 12B, the pressure of which is less than the pressure in the cavity 11 at any one time.
In this embodiment, the step of "the larger the absolute value of the difference between the center position and the preset center position is, the faster the air suction speed is" includes: when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped; when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value; when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
Here, it can be understood that the first threshold < the second threshold. In addition, because the air pressure in the surrounding environment is constantly changing, when the absolute value of the difference between the central position and the preset central position is less than or equal to the first threshold value, air is not extracted.
Here, a fine-adjustment air extractor and a quick air extractor may be provided in the vibration table, the fine-adjustment air extractor and the quick air extractor being communicated with the outlet 12B at one end and the negative pressure source of gas at the other end, wherein the air extraction speed of the fine-adjustment air extractor from the outlet 12B is a first speed value, and the air extraction speed of the quick air extractor from the outlet 12B is a second speed value.
In this embodiment, the step of "the larger the absolute value of the difference between the center position and the preset center position is, the faster the inflation speed is" includes: when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out; when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value; when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
Here, it is understood that the third threshold < the fourth threshold. In addition, because the air pressure in the surrounding environment is constantly changing, when the absolute value of the difference between the central position and the preset central position is less than or equal to the third threshold value, air is not extracted.
Here, a fine adjustment inflator and a quick inflator, each of which has one end connected to the inlet 12A and the other end connected to the positive pressure source of gas, may be provided in the vibration table, wherein the inflation speed of the fine adjustment inflator to the inlet 12A is a third speed value and the inflation speed of the quick inflator to the inlet 12A is a fourth speed value.
In this embodiment, as shown in fig. 3A to 3C, the position sensor includes: two groove-type photoelectric switches 31 fixed in the inner cavity 11, and a vertical baffle 32 fixed to the moving coil 2; the two groove-shaped photoelectric switches 31 are distributed up and down, each groove-shaped photoelectric switch 31 is provided with a groove 311 extending along the up-down direction, and the extending lines of the two grooves 311 are the same vertical line; the distance between the two grooves 311 is equal to the distance between the upper end and the lower end of the vertical baffle 32, and when the center position of the moving coil 2 is at the preset center position, the upper end of the vertical baffle 32 is inserted into the groove 311 at the upper side, and the lower end is inserted into the groove 311 at the lower side; when the center position of the moving coil 2 is lower than the preset center position, the vertical baffle 32 is only inserted into the groove 311 on the lower side; when the center position of the moving coil 2 is higher than the preset center position, the vertical baffle 32 is inserted into the groove 311 on the upper side only;
the "acquiring the plurality of pieces of position information of the moving coil 2 sent by the position sensor" specifically includes: acquiring a time T1 when the upper end is inserted into the upper groove 311 and a time T2 when the lower end is inserted into the lower groove 311 in a preset time period T;
the "acquiring the center position of the moving coil 2 based on the plurality of pieces of position information" specifically includes: the center position of the moving coil 2 is obtained based on T, T1 and T2.
Here, as shown in fig. 3A, 3B, and 3C, the non-contact sensor includes: two groove-type photoelectric switches 31 are fixedly arranged in the inner cavity 11, the two groove-type photoelectric switches 31 are distributed up and down, each groove-type photoelectric switch 31 is provided with a groove 311 extending along the up-down direction, the grooves 311 of the two groove-type photoelectric switches 31 extend along the same vertical line, two opposite inner side surfaces of the groove 311 are respectively provided with a laser emitter and a laser receiver, and the laser receiver can receive laser emitted by the laser emitter; the outer side surface of the moving coil 2 is provided with the vertical baffle 32, the vertical baffle 32 can extend into the groove 311 and can move up and down, and it can be understood that, for one groove 311, when the vertical baffle 32 is inserted into the groove 311, due to the shielding of the vertical baffle 32, in the groove 311, the laser receiver cannot receive the laser emitted by the laser emitter; otherwise, the laser receiver can receive the laser emitted by the laser emitter.
Here, the distance between the upper and lower two recesses 311 is equal to the distance between the upper and lower ends of the vertical baffle 32; as shown in fig. 3B, when the center position of the moving coil 2 is located at the preset center position, the upper end of the vertical baffle 32 is inserted into the upper groove 311, and the lower end is inserted into the lower groove 311; as shown in fig. 3A, when the center position of the moving coil 2 is lower than the preset center position, the upper end of the vertical baffle 32 is not inserted into the upper groove 311, and the lower end is inserted into the lower groove 311; as shown in fig. 3C, when the center position of the moving coil 2 is higher than the preset center position, the upper end portion of the vertical baffle 32 is inserted into the upper groove 311, and the lower end portion is not inserted into the lower groove 311. Then, in a certain time period T, a time T1 when the vertical baffle 32 is inserted into the upper groove 311 (i.e., a time when the laser receiver does not receive the laser light) is obtained, and a first insertion time ratio T1/T is obtained; and a time T2 when the vertical baffle 32 is inserted into the lower groove 311 (i.e., a time when the laser receiver does not receive the laser light) is obtained, and a second insertion time ratio T2/T is obtained, and then the center position is located above or below the preset center position according to the two duty ratios. Optionally, the first insertion time ratio > the second insertion time ratio, the center position is located above the preset center position, and the larger the difference between the first insertion time ratio and the second insertion time ratio, the larger the difference between the center position and the preset center position. The first insertion time ratio < the second insertion time ratio, the center position is located below the preset center position, and the larger the difference between the second insertion time ratio and the first insertion time ratio, the larger the difference between the preset center position and the center position.
The duty ratio is a square wave signal with equal amplitude and different duty ratio, and then the acquired square wave signal is subjected to Fourier transform, RMS-DC transform, compensation and amplification to obtain a position variable signal. Thereafter, the following steps may be performed: (1) during high-frequency vibration, the position of the moving coil changes at a moment, so that the position variable signal changes at a moment; (2) capturing position variable signals of a plurality of points in a plurality of vibration periods; (3) establishing a preset vibration mathematical model in real time through real-time position variable data; (4) and calculating the central position in real time according to a preset vibration mathematical model. Through long-term experiments of the inventor, the center position of the moving coil obtained by the algorithm is found to be very accurate, and the calculation precision is within 1 mm.
The second embodiment of the invention provides a control device of a vibrating table, the vibrating table comprises a pressure-bearing table body 1 with an inner cavity 11, a moving coil 2 arranged in the inner cavity 11, a position sensor for acquiring the position of the moving coil 2 in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity 11, wherein the moving coil 2 penetrates out of an upper side shell of the inner cavity 11 and can vibrate up and down relative to the pressure-bearing table body 1; the system comprises the following modules:
the position information acquisition module is used for continuously acquiring a plurality of pieces of position information of the moving coil 2 sent by the position sensor;
a central position generating module, configured to obtain a central position of the moving coil 2 based on the plurality of pieces of position information;
the first processing module is used for controlling the air pump to pump air from the inner cavity 11 when the central position is determined to be above a preset central position, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is;
and the second processing module is used for controlling the air pump to inflate from the inner cavity 11 when the central position is determined to be below the preset central position, and the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger.
In this embodiment, the first processing module is further configured to: when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped; when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value; when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
In this embodiment, the second processing module is further configured to: when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out; when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value; when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
In this embodiment, the position sensor includes: two groove-type photoelectric switches 31 fixed in the inner cavity 11, and a vertical baffle 32 fixed to the moving coil 2; the two groove-shaped photoelectric switches 31 are distributed up and down, each groove-shaped photoelectric switch 31 is provided with a groove 311 extending along the up-down direction, and the two grooves 311 are positioned on the same vertical line; the distance between the two grooves 311 is equal to the distance between the upper and lower ends of the vertical baffle 32, and when the center position of the moving coil 2 is at the preset center position, the upper end of the vertical baffle 32 is inserted into the upper groove 311, and the lower end is inserted into the lower groove 311; when the center position of the moving coil 2 is lower than the preset center position, the vertical baffle 32 is only inserted into the groove 311 on the lower side; when the center position of the moving coil 2 is higher than the preset center position, the vertical baffle 32 is inserted into the groove 311 on the upper side only;
the position information obtaining module is further configured to: acquiring a time T1 when the upper end is inserted into the upper groove 311 and a time T2 when the lower end is inserted into the lower groove 311 in a preset time period T;
the central location generation module is further to: the center position of the moving coil 2 is obtained based on T, T1 and T2.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A control method of a vibration table comprises a pressure bearing table body (1) with an inner cavity (11), a moving coil (2) arranged in the inner cavity (11), a position sensor for acquiring the position of the moving coil (2) in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity (11), wherein the moving coil (2) penetrates out of an upper side shell of the inner cavity (11) and can vibrate vertically relative to the pressure bearing table body (1), and the lower end face of the moving coil (2) is always positioned in the inner cavity (11) in the vibration process; the method is characterized by comprising the following steps:
continuously acquiring a plurality of pieces of position information of the moving coil (2) sent by the position sensor;
acquiring the central position of the moving coil (2) based on the position information;
when the central position is determined to be above a preset central position, the air pump is controlled to pump air from the inner cavity (11), and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is;
and when the central position is determined to be below the preset central position, controlling the air pump to inflate from the inner cavity (11), wherein the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger.
2. The control method according to claim 1, wherein the "the larger the absolute value of the difference between the center position and the preset center position, the faster the pumping speed" includes:
when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped;
when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value;
when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
3. The control method according to claim 1, wherein the "the larger the absolute value of the difference between the center position and the preset center position, the faster the inflation speed" includes:
when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out;
when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value;
when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
4. The control method according to claim 1, characterized in that:
the position sensor includes: two groove-shaped photoelectric switches (31) fixed in the inner cavity (11) and a vertical baffle (32) fixed on the moving coil (2); the two groove-shaped photoelectric switches (31) are distributed up and down, each groove-shaped photoelectric switch (31) is provided with a groove (311) extending along the up-down direction, and the extending lines of the two grooves (311) are the same vertical line; the distance between the two grooves (311) is equal to the distance between the upper end part and the lower end part of the vertical baffle plate (32); when the center position of the moving coil (2) is located at a preset center position, the upper end part of the vertical baffle (32) is inserted into the groove (311) at the upper side, and the lower end part of the vertical baffle is inserted into the groove (311) at the lower side; when the center position of the moving coil (2) is lower than the preset center position, the vertical baffle (32) is only inserted into the groove (311) at the lower side; when the center position of the moving coil (2) is higher than the preset center position, the vertical baffle (32) is only inserted into the groove (311) on the upper side;
the step of acquiring the position information of the moving coil (2) sent by the position sensor specifically comprises the following steps: acquiring a time T1 when the upper end is inserted into the groove (311) on the upper side and a time T2 when the lower end is inserted into the groove (311) on the lower side in a preset time period T;
the step of acquiring the central position of the moving coil (2) based on the plurality of pieces of position information specifically includes: the center position of the moving coil (2) is obtained based on T, T1 and T2.
5. A control device of a vibration table comprises a pressure-bearing table body (1) with an inner cavity (11), a moving coil (2) arranged in the inner cavity (11), a position sensor for acquiring the position of the moving coil (2) in the vertical direction, and an air pump capable of inflating and exhausting air into the inner cavity (11), wherein the moving coil (2) penetrates out of an upper side shell of the inner cavity (11) and can vibrate vertically relative to the pressure-bearing table body (1); the system is characterized by comprising the following modules:
the position information acquisition module is used for continuously acquiring a plurality of pieces of position information of the moving coil (2) sent by the position sensor;
the central position generating module is used for acquiring the central position of the moving coil (2) based on the position information;
the first processing module is used for controlling the air pump to pump air from the inner cavity (11) when the central position is determined to be above a preset central position, and the larger the absolute value of the difference between the central position and the preset central position is, the faster the air pumping speed is;
and the second processing module is used for controlling the air pump to inflate from the inner cavity (11) when the central position is determined to be below the preset central position, and the inflation speed is higher when the absolute value of the difference between the central position and the preset central position is larger.
6. The control device of claim 5, wherein the first processing module is further configured to:
when the absolute value of the difference between the central position and the preset central position is less than or equal to a first threshold value, air is not pumped;
when the first threshold value < the absolute value of the difference between the central position and the preset central position < the second threshold value, the air suction speed is a first speed value;
when the second threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the air exhaust speed is a second speed value; wherein the first speed value < the second speed value.
7. The control device of claim 5, wherein the second processing module is further configured to:
when the absolute value of the difference between the central position and the preset central position is less than or equal to a third threshold value, no inflation is carried out;
when the third threshold value is smaller than the absolute value of the difference between the central position and the preset central position and smaller than the fourth threshold value, the inflation speed is a third speed value;
when the fourth threshold value is less than or equal to the absolute value of the difference between the central position and the preset central position, the inflation speed is a fourth speed value; wherein the third speed value < the fourth speed value.
8. The control device according to claim 5, characterized in that:
the position sensor includes: two groove-shaped photoelectric switches (31) fixed in the inner cavity (11) and a vertical baffle (32) fixed on the moving coil (2); the two groove-shaped photoelectric switches (31) are distributed up and down, each groove-shaped photoelectric switch (31) is provided with a groove (311) extending along the up-down direction, and the two grooves (311) are positioned on the same vertical line; the distance between the two grooves (311) is equal to the distance between the upper end and the lower end of the vertical baffle (32), and when the center position of the moving coil (2) is located at the preset center position, the upper end of the vertical baffle (32) is inserted into the groove (311) at the upper side, and the lower end of the vertical baffle (32) is inserted into the groove (311) at the lower side; when the center position of the moving coil (2) is lower than the preset center position, the vertical baffle (32) is only inserted into the groove (311) at the lower side; when the center position of the moving coil (2) is higher than the preset center position, the vertical baffle (32) is only inserted into the groove (311) on the upper side;
the position information obtaining module is further configured to: acquiring a time T1 when the upper end is inserted into the groove (311) on the upper side and a time T2 when the lower end is inserted into the groove (311) on the lower side in a preset time period T;
the central location generation module is further to: the center position of the moving coil (2) is obtained based on T, T1 and T2.
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| CN202010606420.XA CN111649890A (en) | 2020-06-29 | 2020-06-29 | Method and device for controlling vibration table |
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Cited By (1)
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| CN113465852A (en) * | 2021-07-05 | 2021-10-01 | 苏州苏试试验集团股份有限公司 | Dynamic centering method of vibration system under vibration condition |
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Application publication date: 20200911 |