A calibration device for a gravity-acceleration wave sensor

Abstract

The application discloses a kind of calibration devices of gravity acceleration type wave sensor, it is related to marine observation equipment and its peripheral supporting facilities technical field, the calibration device designed in the application includes host computer, servo electric cylinder, pulley block, connecting rope and mounting bracket, host computer is connected and controls servo electric cylinder's telescopic rod driving pulley block's movable pulley to carry out telescopic reciprocating motion, and movable pulley is driven to carry out lifting reciprocating motion by pulley block amplification stroke to the wave sensor to be calibrated;Host computer obtains the measurement motion data of wave sensor to be calibrated in the process of lifting reciprocating motion, and calibrates wave sensor to be calibrated in conjunction with the motion data of wave sensor to be calibrated in the process of lifting reciprocating motion.The calibration device of the application is simple in structure, and low in manufacturing cost;Through pulley block amplification stroke, so that wave sensor to be calibrated can be calibrated in smaller calibration site, effectively reduce the requirement to calibration site.

Description

Technical Field

[0001] This application relates to the technical field of marine observation equipment and its supporting facilities, and in particular to a calibration device for a gravity acceleration wave sensor. Background Technology

[0002] Wave sensors based on the principle of gravitational acceleration are commonly used to observe ocean wave parameters (wave height, wave period). Ocean waves are complex waveforms composed of multiple single sine waves. Water particles on the surface of these waves periodically oscillate around their equilibrium positions, exhibiting different vertical accelerations at different times. The vertical displacement of the water particles is obtained by integrating this vertical acceleration twice. Gravity-acceleration wave sensors contain accelerometers that measure the vertical acceleration voltage signal as the wave surface rises and falls. After double integration, the voltage signal reflecting the wave surface undulations is obtained. This voltage signal is then converted from analog to digital and processed to yield various characteristic values ​​of the wave.

[0003] Before using gravity-accelerometer wave sensors, they need to be tested. Current laboratory testing methods for gravity-accelerometer wave sensors use a turntable-type calibration device. The rotation speed of the calibration device is controlled by a motor, allowing the wave sensor to rotate at a constant speed in a circle to simulate a sine curve. This type of calibration device has very high requirements for site space, construction technology, and the turntable drive motor. The construction cost limits the development of laboratory calibration devices in relevant research institutions, resulting in a long calibration cycle for wave sensors. Summary of the Invention

[0004] In response to the aforementioned technical problems and requirements of existing gravity acceleration wave sensor calibration devices, such as high manufacturing costs and stringent requirements for calibration sites, the applicant proposes a calibration device for gravity acceleration wave sensors. The technical solution of this application is as follows:

[0005] The calibration device for this gravity-acceleration wave sensor includes a host computer, a servo electric cylinder, a pulley block, a connecting rope, and a mounting bracket. The servo electric cylinder and the pulley block are mounted on the mounting bracket. The host computer is connected to and controls the servo electric cylinder, and also communicates with the wave sensor to be calibrated. The pulley block includes at least one movable pulley. One end of the extension rod of the servo electric cylinder is connected to the movable pulley, and the connecting rope passes around the movable pulley and connects to the wave sensor to be calibrated. The wave sensor to be calibrated is a gravity-acceleration wave sensor.

[0006] The verification method implemented using this verification device includes: the host computer controls the extension rod of the servo electric cylinder to drive the movable pulley to perform extension and reciprocating motion according to the wave spectrum data, so as to drive the wave sensor to be verified to perform lifting and reciprocating motion, and the motion stroke of the wave sensor to be verified is greater than the motion stroke of the extension rod of the servo electric cylinder.

[0007] The host computer acquires the measured motion data of the wave sensor to be tested during the lifting and reciprocating motion process, and combines the actual motion data of the wave sensor to be tested during the lifting and reciprocating motion process to test the wave sensor.

[0008] A further technical solution is that the pulley block includes several sets of movable pulley units and several sets of fixed pulley units. Each set of movable pulley units includes at least one movable pulley, and each set of fixed pulley units includes at least one fixed pulley. Each fixed pulley is fixed on a mounting bracket.

[0009] One end of the connecting rope is connected to a movable pulley unit, and the other end alternately passes around each fixed pulley unit and each movable pulley unit before being connected to the wave sensor to be calibrated; or, one end of the connecting rope is fixed to the mounting bracket, and the other end alternately passes around each movable pulley unit and each fixed pulley unit before being connected to the wave sensor to be calibrated.

[0010] A further technical solution is that the pulley block also includes a fixed pulley plate and a movable pulley plate. Each fixed pulley unit is arranged side by side and fixed on the fixed pulley plate, and each movable pulley unit is arranged side by side and fixed on the movable pulley plate. The fixed pulley plate is fixed on the mounting bracket, and the movable pulley plate is placed in the slide rail of the mounting bracket. The extension direction of the slide rail is parallel to the extension direction of the extension rod of the servo electric cylinder.

[0011] Each fixed pulley unit on the fixed pulley plate and each movable pulley unit on the movable pulley plate are arranged in parallel and facing each other. One end of the extension rod of the servo electric cylinder is connected to the movable pulley plate. The extension rod of the servo electric cylinder drives the movable pulley plate to reciprocate along the slide rail, causing each movable pulley unit to move toward or away from each fixed pulley unit.

[0012] A further technical solution involves obtaining the actual motion data of the wave sensor to be calibrated during its reciprocating motion, including:

[0013] The calibration device also includes a displacement measurement unit that communicates with a host computer. The displacement measurement unit collects the rise and fall motion curves of the wave sensor under calibration during its reciprocating motion, and analyzes the rise and fall motion curves to determine the actual motion data. The rise and fall motion curves indicate the change curve of the rise and fall height of the wave sensor under calibration over time; or, the actual motion data can be determined by analyzing the wave spectrum data.

[0014] A further technical solution is that the displacement measurement unit is a displacement sensor, which is fixed on the mounting bracket, and the pull rope end of the displacement sensor is connected to the wave sensor to be calibrated.

[0015] A further technical solution is that the displacement measurement unit is a laser rangefinder, which is fixed on the mounting bracket and vertically downward toward the wave sensor to be calibrated, measuring the distance between the laser rangefinder and the wave sensor to be calibrated.

[0016] A further technical solution involves a host computer controlling a servo electric cylinder's telescopic rod to drive a movable pulley in a sinusoidal reciprocating motion, thereby driving the wave sensor under test to perform a sinusoidal lifting and lowering reciprocating motion; analyzing the lifting and lowering motion curves to determine the actual motion data includes:

[0017] By determining the statistical value of the vertical distance between the highest point reached in the rise and fall motion curve and the adjacent lowest point reached, the actual wave height of the wave sensor to be verified is obtained.

[0018] By determining the statistical value of the time between two consecutive times the highest point of the rise and fall in the rise and fall motion curve, the actual wave period of the wave sensor to be tested can be obtained.

[0019] A further technical solution involves calibrating the wave sensor to be calibrated, including:

[0020] The extension rods of the servo electric cylinders are controlled to drive the pulleys to perform multiple extension and reciprocating motions in the form of a sine wave. The theoretical wave height and theoretical wave period of each extension and reciprocating motion are different. The error between the measured motion data and the actual motion data of each extension and reciprocating motion is calculated to obtain the verification error. The verification error of each extension and reciprocating motion is combined to obtain the verification result of the wave sensor to be verified.

[0021] A further technical solution is that the mounting bracket adopts an assemblable structure and includes a horizontal bracket and a lifting bracket. The lifting bracket is placed vertically, the horizontal bracket is placed horizontally and fixed on the lifting bracket, and the servo electric cylinder and pulley group are installed on the surface of the horizontal bracket along the horizontal direction.

[0022] When there is an obstruction at the installation location of the mounting bracket, adjust the height of the lifting bracket so that the surface of the horizontal bracket is higher than the upper surface of the obstruction, so that the connecting rope that passes around the pulley block extends from the surface of the horizontal bracket to the other side of the obstruction and connects to the wave sensor to be tested in a free suspension state.

[0023] A further technical solution is that the verification method implemented using this verification device also includes:

[0024] The theoretical wave height of the wave sensor to be calibrated during its reciprocating motion is determined by analyzing the wave spectrum data. Based on the theoretical wave height, the calibration scenario is determined, and a calibration device is built within the calibration scenario. After the calibration device is built within the calibration scenario, the wave sensor to be calibrated is in a free-suspension state within the calibration scenario, and the free rise and fall height of the wave sensor to be calibrated within the calibration scenario is greater than the theoretical wave height.

[0025] The beneficial technical effects of this application are:

[0026] The calibration device for the gravity acceleration wave sensor designed in this application adopts a combination of a servo electric cylinder and a pulley system. The host computer controls the telescopic rod of the servo electric cylinder to perform a small-range telescopic reciprocating motion, and the pulley system amplifies the stroke, so that the wave sensor to be calibrated can be calibrated in a smaller calibration area. Compared with the traditional turntable calibration device, it effectively reduces the requirements for the calibration area.

[0027] Compared with traditional motors, the servo electric cylinder used in this application can effectively eliminate the pause gap when moving to the top, thereby more accurately simulating the sinusoidal characteristics of wave motion, and greatly reducing manufacturing costs while ensuring the accuracy of verification.

[0028] The verification device of this application adopts a modular structure, which is compact and saves space. Furthermore, it can be flexibly set up in different verification scenarios by adjusting the height of the lifting bracket.

[0029] The calibration device of this application also includes a counterweight unit and a protective shell. The protective shell can effectively protect the wave sensor to be calibrated. The counterweight unit is connected to the wave sensor to be calibrated and can increase the weight of the wave sensor to be calibrated, effectively preventing the calibration results from being affected by wind. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the verification device in one embodiment of this application.

[0031] Figure 2 This is a schematic diagram of a verification method of a verification device in one embodiment of this application.

[0032] Figure 3 (a) is a schematic diagram of a pulley system that starts winding from the driven pulley unit in one embodiment of this application.

[0033] Figure 3 (b) is a schematic diagram of a pulley system that starts winding from the driven pulley unit in one embodiment of this application.

[0034] Figure 4 This is a schematic diagram of the pulley block winding and servo electric cylinder connection in one embodiment of this application.

[0035] Reference numerals in the attached diagram: 1. Servo electric cylinder; 2. Pulley block; 3. Connecting rope; 4. Wave sensor to be calibrated; 5. Displacement measurement unit; 6. Control unit; 7. Horizontal support; 8. Lifting support; 9. Displacement measurement support; 10. Support support; 11. Slide rail; 12. Moving pulley unit; 13. Fixed pulley unit; 14. Moving pulley plate; 15. Fixed pulley plate. Detailed Implementation

[0036] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, a calibration device for a gravity acceleration wave sensor according to this application includes a host computer, a servo electric cylinder 1, a pulley block 2, a connecting rope 3, and a mounting bracket; the servo electric cylinder 1 and the pulley block 2 are arranged on the mounting bracket, the host computer is connected to and controls the servo electric cylinder 1, and the host computer is also in communication connection with the wave sensor 4 to be calibrated; the pulley block includes at least one movable pulley, one end of the telescopic rod of the servo electric cylinder is connected to the movable pulley, and the connecting rope passes around the movable pulley and is connected to the wave sensor to be calibrated.

[0038] In one embodiment, the wave sensor to be calibrated is a gravity acceleration wave sensor. After production, the gravity acceleration wave sensor needs to be calibrated before it can be used for measurement in actual wave scenarios. However, existing calibration devices are mainly traditional turntable calibration devices, which have a diameter of 6 meters, occupy an area of ​​18 square meters, and require a building height of up to 6 meters for calibration. Therefore, this device has very high requirements for the calibration environment. In addition, traditional turntable calibration devices have a complex structure and high requirements for the turntable drive motor, resulting in high manufacturing costs.

[0039] In addition, this application uses a host computer to control a servo electric cylinder to perform telescopic reciprocating motion. Compared with traditional motors, the servo electric cylinder can effectively eliminate the pause gap when moving to the top, thereby more accurately simulating the sinusoidal characteristics of wave motion, and greatly reducing manufacturing costs while ensuring the accuracy of verification.

[0040] In one embodiment, such as Figure 1 As shown, the verification device of this application also includes a control unit 5, which includes a motion controller and a servo driver. The motion controller is used to receive wave motion signals transmitted from the host computer and send control commands to the servo driver. The servo driver is used to receive the control commands and provide corresponding voltage and current to the motor of the servo electric cylinder.

[0041] In one embodiment, the verification device of this application further includes an integrated acquisition unit. The host computer communicates with the control unit and the wave sensor to be verified through the integrated acquisition unit. The integrated acquisition unit is a multi-channel analog-to-digital signal acquisition unit, used to input wave motion signals from the host computer to the control unit and to input measured motion data of the wave sensor to be verified during its reciprocating motion to the host computer. When the verification device also includes a displacement measurement unit, the integrated acquisition unit also communicates with the displacement measurement unit to input the actual motion data measured by the displacement measurement unit to the host computer.

[0042] like Figure 2As shown, the verification method implemented using the verification device of this application includes: the host computer controls the extension rod of the servo electric cylinder to drive the movable pulley to perform reciprocating motion according to the wave spectrum data, thereby driving the wave sensor to be verified to perform lifting and lowering reciprocating motion. Thanks to the mechanical characteristics of the movable pulley, it has the function of amplifying the range, thus making the motion stroke of the wave sensor to be verified greater than the motion stroke of the extension rod of the servo electric cylinder. The wave spectrum data is generated by software algorithms or obtained after actual sampling of the waves.

[0043] The host computer acquires the measured motion data of the wave sensor to be tested during the lifting and reciprocating motion process, and combines the actual motion data of the wave sensor to be tested during the lifting and reciprocating motion process to test the wave sensor.

[0044] In one embodiment, a method for obtaining actual motion data of a wave sensor to be calibrated during its reciprocating motion includes: parsing wave spectrum data to obtain theoretical motion data, and directly using the theoretical motion data as actual motion data.

[0045] However, errors can occur during the structural installation process and due to the elasticity of the connecting rope, causing the actual motion data to differ from the theoretical motion data and affecting the verification results. To reduce these errors, in one embodiment, the connecting rope is made of steel wire, and the elongation of the steel wire under tension is less than 1% of its original length, thus ensuring high accuracy.

[0046] Even when steel wire is used, the elongation error caused by the elasticity of the steel wire will be amplified due to the stroke amplification effect of the pulley system, thus affecting the verification results. Therefore, in another embodiment, such as... Figure 1 As shown, the calibration device also includes a displacement measurement unit 6, which is connected to a host computer for communication. When the calibration device includes a displacement measurement unit 6 connected to a host computer for communication, the method for obtaining the actual motion data of the wave sensor to be calibrated during the lifting and reciprocating motion includes: acquiring the lifting and lowering motion curve of the wave sensor to be calibrated during the lifting and reciprocating motion through the displacement measurement unit, and analyzing the lifting and lowering motion curve to determine the actual motion data. The lifting and lowering motion curve indicates the change curve of the lifting and lowering height of the wave sensor to be calibrated over time.

[0047] In one embodiment, the displacement measuring unit is a displacement sensor, which is fixed on a mounting bracket, and the pull rope end of the displacement sensor is connected to the wave sensor to be calibrated. This displacement sensor can be a high-precision linear displacement sensor with a linear accuracy of less than or equal to 0.25%FS.

[0048] In another embodiment, the displacement measurement unit is a laser rangefinder, which is fixed on a mounting bracket and vertically downwards towards the wave sensor to be calibrated, measuring the distance between the laser rangefinder and the wave sensor. The laser rangefinder obtains the distance between itself and the wave sensor by emitting a laser beam towards it.

[0049] Regardless of how the actual motion data is acquired, the verification of the wave sensor to be verified is carried out by combining the measured motion data with the actual motion data. This includes: calculating the error between the measured motion data and the actual motion data to obtain the verification error; when the verification error exceeds the error range, the wave sensor to be verified is determined to have failed the verification; when the verification error does not exceed the error range, the wave sensor to be verified is determined to have passed the verification.

[0050] In one embodiment, the host computer controls the extension rod of the servo electric cylinder to drive the movable pulley in a sinusoidal reciprocating motion, thereby driving the wave sensor under test to perform a sinusoidal reciprocating motion. The motion data of the wave sensor under test includes wave height and wave period. The measured motion data of the wave sensor under test during the reciprocating motion includes the measured wave height and measured wave period. The actual motion data of the wave sensor under test during the reciprocating motion includes the actual wave height and actual wave period. Determining the actual motion data by analyzing the reciprocating motion curve includes:

[0051] (1) Determine the statistical value of the vertical distance between the highest point reached in the rising and falling motion curve and the adjacent lowest point reached in the rising and falling motion curve, and obtain the actual wave height of the wave sensor to be tested.

[0052] (2) Determine the statistical value of the time between two adjacent times reaching the highest point of the rise and fall in the rise and fall motion curve to obtain the actual wave period of the wave sensor to be tested. In other embodiments, the statistical value of the time between two adjacent times reaching the lowest point of the rise and fall can also be selected as the actual wave period, or twice the statistical value of the time between two adjacent times reaching the midpoint of the rise and fall can be selected as the actual wave period.

[0053] The verification error is calculated by comparing the measured motion data with the actual motion data. This includes the wave period error (between the calculated actual wave period and the measured wave period) and the wave height error (between the calculated actual wave height and the measured wave height). Each wave period error and wave height error has its own corresponding error range. The servo electric cylinder's telescopic rod drives the pulley in multiple sinusoidal reciprocating motions. At least one of the theoretical wave height and theoretical wave period differs in each sinusoidal reciprocating motion. The verification error is calculated by comparing the measured motion data with the actual motion data for each reciprocating motion. The verification result of the wave sensor to be verified is obtained by combining the verification errors from all reciprocating motions. If the proportion of verification errors exceeding the error range does not reach the proportional threshold, the wave sensor to be verified is considered to have passed verification; otherwise, the wave sensor to be verified is considered to have failed verification.

[0054] Based on national regulations for the calibration of gravity-acceleration wave sensors, the theoretical wave heights indicated by the wave spectrum data must include at least 1 meter, 3 meters, and 6 meters. Under each theoretical wave height, seven different wave periods are set, thus conducting 21 calibrations on the wave sensor to be calibrated under 21 different wave spectrum data.

[0055] In order to better utilize the verification device of this application to verify waves of different wave heights, the verification device needs to be built according to the verification requirements before the verification is carried out, including the following aspects:

[0056] (1) Select a suitable pulley system.

[0057] After determining the maximum range L of the servo electric cylinder's telescopic rod, the maximum variation range of the lifting height of the wave sensor under test during its reciprocating motion is L*K, where K is the stroke amplification factor of the pulley system. When setting up the calibration device, it must be ensured that the maximum variation range of the lifting height of the wave sensor under test during its reciprocating motion meets the theoretical wave height indicated by the wave spectrum data. For example, if the theoretical wave height indicated by the wave spectrum data is 6 meters, and the maximum range L of the servo electric cylinder's telescopic rod is 0.5 meters, then the stroke amplification factor K of the pulley system must be at least 12 times, K≥2.

[0058] Therefore, the stroke magnification factor K of the pulley block is first determined based on the theoretical wave height indicated by the wave spectrum data and the maximum range L of the extension rod of the servo electric cylinder, and then a pulley block structure with this stroke magnification factor K is built.

[0059] Based on the winding and mechanical characteristics of pulleys, in order to achieve the stroke amplification factor K, the pulley group includes several sets of movable pulley units and several sets of fixed pulley units. Each set of movable pulley units includes at least one movable pulley, and each set of fixed pulley units includes at least one fixed pulley. Each fixed pulley is fixed on the mounting bracket.

[0060] One winding method involves connecting one end of the connecting rope to a movable pulley unit, and the other end alternately winding around each fixed pulley unit and each movable pulley unit before connecting to the wave sensor to be calibrated. Another winding method involves fixing one end of the connecting rope to a mounting bracket, and the other end alternately winding around each movable pulley unit and each fixed pulley unit before connecting to the wave sensor to be calibrated. When one end of the connecting rope is fixed to the mounting bracket, it can be directly fixed to the bracket, or fixed to the bracket via an intermediate component, such as a fixed pulley or other adapter plate. The winding method between the movable and fixed pulleys satisfies the winding characteristics of pulleys, which will not be described in detail in this embodiment.

[0061] Schematic illustration: The pulley system includes 3 sets of movable pulley units and 3 sets of fixed pulley units. Each movable pulley unit includes 2 movable pulleys, and each fixed pulley unit includes 2 fixed pulleys. For example... Figure 3 As shown in (a), when one end of the connecting rope is connected to a movable pulley unit 12, the other end alternately passes through each fixed pulley unit 13 and each movable pulley unit 12 before being connected to the wave sensor to be tested. Figure 3 As shown in (b), when one end of the connecting rope is fixed to the mounting bracket, it can be directly fixed to the mounting bracket or fixed to the fixed pulley unit 13. The other end alternately passes around each movable pulley unit 12 and each fixed pulley unit 13 in sequence and is then connected to the wave sensor to be calibrated. The figure is only an example of one winding method. In other embodiments, different winding methods can be used as needed, which will not be described in detail here.

[0062] Regardless of the specific number of movable and fixed pulley units included in the pulley block, in one embodiment, for ease of installation, such as Figure 4 As shown, the pulley system also includes a fixed pulley plate 15 and a movable pulley plate 14. Each fixed pulley unit 13 is arranged side-by-side and fixed on the fixed pulley plate 15, and each movable pulley unit 12 is arranged side-by-side and fixed on the movable pulley plate 14. The fixed pulley plate 15 is fixed to a mounting bracket, and the movable pulley plate 14 is placed within a slide rail 11 of the mounting bracket. The extension direction of the slide rail 11 is parallel to the extension direction of the telescopic rod of the servo electric cylinder 1. Each fixed pulley unit 13 on the fixed pulley plate 15 and each movable pulley unit 12 on the movable pulley plate 14 are arranged parallel to each other and facing each other. One end of the telescopic rod of the servo electric cylinder 1 is connected to the movable pulley plate 14. The telescopic rod of the servo electric cylinder 1 drives the movable pulley plate 14 to reciprocate along the slide rail, causing each movable pulley unit 12 to move towards or away from each fixed pulley unit 13. Figure 4 Taking a unit consisting of 6 movable pulley units and 6 fixed pulley units as an example, where each movable pulley unit includes 1 movable pulley and each fixed pulley unit includes 1 fixed pulley.

[0063] (2) Set up the verification device in a suitable verification scenario.

[0064] As mentioned above, analyzing wave spectrum data can determine the theoretical wave height of the wave sensor to be calibrated during its reciprocating motion. Without considering errors, the maximum range of change in the rise and fall height of the wave sensor to be calibrated is equal to this theoretical wave height.

[0065] Therefore, the verification scenario is determined based on the theoretical wave height, and a verification device is built in the verification scenario. After the verification device is built in the verification scenario, the wave sensor to be verified is in a free suspension state in the verification scenario, and the free rise and fall height of the wave sensor to be verified in the verification scenario is greater than the theoretical wave height, and the corresponding height margin is reserved according to actual needs.

[0066] For example, if the theoretical wave height is 7 meters, then the height margin is 2 meters. When determining the verification scenario, at least ensure that the free rise and fall height of the wave sensor to be verified is at least 9 meters.

[0067] The calibration scenario of this application can be either outdoor or indoor. In an outdoor calibration scenario, to avoid calibration errors caused by wind when the wave sensor to be calibrated is freely suspended, in another embodiment, the calibration device further includes a counterweight unit and a protective housing. The wave sensor to be calibrated is disposed inside the protective housing for protection. The counterweight unit is installed on the protective housing and is connected to the wave sensor to be calibrated to increase the weight of the wave sensor and prevent the calibration results from being affected by wind.

[0068] Regardless of the verification scenario, there may be obstructions at the mounting bracket's location. For example, in an indoor verification scenario, if the mounting bracket is located near a window, the windowsill would be the obstruction. Considering that the height of obstructions varies in different verification scenarios, in order to ensure that the verification device is applicable even with obstructions of various heights, in this embodiment, the mounting bracket includes a horizontal bracket 7 and a lifting bracket 8. Figure 1 As shown, the lifting bracket is placed vertically, the horizontal bracket is placed horizontally and fixed on the lifting bracket, and the servo electric cylinder and pulley group are installed on the surface of the horizontal bracket along the horizontal direction.

[0069] When there is an obstruction at the mounting bracket's location, adjust the height of the lifting bracket until the surface of the horizontal bracket is higher than the upper surface of the obstruction. This allows the connecting rope, which passes around the pulley block, to extend from the surface of the horizontal bracket to the other side of the obstruction, connecting to the wave sensor to be calibrated in a free-suspended state. Optionally, a windowsill or railing can be used as an obstruction, with one end of the mounting bracket resting on the windowsill or railing, allowing the wave sensor to be calibrated to be in a free-suspended state.

[0070] In one embodiment, the mounting bracket further includes a displacement measuring bracket 9 and a support bracket 10. The displacement measuring bracket 9 is fixed to one end of the horizontal bracket and is used to support the displacement measuring unit and to be placed above any obstruction during calibration. The support bracket 10 is placed vertically and parallel to the lifting bracket, near the pulley block, and provides support when adjusting the height of the device. Furthermore, the mounting bracket adopts a modular structure, allowing for flexible assembly according to different scenarios. In a practical application, the assembled calibration device is 3 meters long, 0.8 meters wide, and 1.2 meters high, occupying a small area.

[0071] The above descriptions are merely preferred embodiments of this application, and this application is not limited to the above embodiments. It is understood that other improvements and variations that can be directly derived or conceived by those skilled in the art without departing from the spirit and concept of this application should be considered to be included within the protection scope of this application.

Claims

1. A calibration device for a gravity acceleration type wave sensor, characterized in that, The calibration device includes a host computer, a servo electric cylinder, a pulley block, a connecting rope, and a mounting bracket. The servo electric cylinder and the pulley block are mounted on the mounting bracket. The host computer is connected to and controls the servo electric cylinder, and also communicates with the wave sensor to be calibrated. The pulley block includes at least one movable pulley. One end of the telescopic rod of the servo electric cylinder is connected to the movable pulley. The connecting rope passes around the movable pulley and is connected to the wave sensor to be calibrated. The wave sensor to be calibrated is a gravity acceleration wave sensor. The verification method implemented using the verification device includes: The host computer controls the telescopic rod of the servo electric cylinder to drive the movable pulley to perform telescopic reciprocating motion according to the wave spectrum data, so as to drive the wave sensor to be tested to perform lifting and lowering reciprocating motion, and the motion stroke of the wave sensor to be tested is greater than the motion stroke of the telescopic rod of the servo electric cylinder. The host computer acquires the measured motion data of the wave sensor to be tested during the up-and-down reciprocating motion process, and combines the actual motion data of the wave sensor to be tested during the up-and-down reciprocating motion process to test the wave sensor to be tested.

2. The verification device according to claim 1, characterized in that, The pulley system includes several sets of movable pulley units and several sets of fixed pulley units. Each set of movable pulley units includes at least one movable pulley, and each set of fixed pulley units includes at least one fixed pulley. Each fixed pulley is fixed on the mounting bracket. One end of the connecting rope is connected to a movable pulley unit, and the other end is alternately passed around each fixed pulley unit and each movable pulley unit in sequence before being connected to the wave sensor to be tested. or, One end of the connecting rope is fixed to the mounting bracket, and the other end alternately passes around each movable pulley unit and each fixed pulley unit before being connected to the wave sensor to be calibrated.

3. The verification device according to claim 2, characterized in that, The pulley system also includes a fixed pulley plate and a movable pulley plate. Each fixed pulley unit is arranged side by side and fixed on the fixed pulley plate, and each movable pulley unit is arranged side by side and fixed on the movable pulley plate. The fixed pulley plate is fixed on the mounting bracket, and the movable pulley plate is placed in the slide rail of the mounting bracket. The extension direction of the slide rail is parallel to the extension direction of the telescopic rod of the servo electric cylinder. Each fixed pulley unit on the fixed pulley plate and each movable pulley unit on the movable pulley plate are arranged parallel to each other and facing each other. One end of the telescopic rod of the servo electric cylinder is connected to the movable pulley plate. The telescopic rod of the servo electric cylinder drives the movable pulley plate to reciprocate along the slide rail, causing each movable pulley unit to move toward or away from each fixed pulley unit.

4. The verification device according to claim 1, characterized in that, The method for obtaining the actual motion data of the wave sensor to be verified during the up-and-down reciprocating motion includes: The verification device also includes a displacement measurement unit that communicates with the host computer. The displacement measurement unit collects the lifting motion curve of the wave sensor to be verified during the lifting and reciprocating motion process, and analyzes the lifting motion curve to determine the actual motion data. The lifting motion curve indicates the curve of the lifting height of the wave sensor to be verified changing over time. or, The actual motion data is determined by analyzing the wave spectrum data.

5. The verification device according to claim 4, characterized in that, The displacement measurement unit is a displacement sensor, which is fixed on the mounting bracket, and the pull rope end of the displacement sensor is connected to the wave sensor to be calibrated.

6. The verification device according to claim 4, characterized in that, The displacement measurement unit is a laser rangefinder, which is fixed on the mounting bracket and vertically downward toward the wave sensor to be calibrated, measuring the distance between itself and the wave sensor.

7. The verification device according to claim 4, characterized in that, The host computer controls the telescopic rod of the servo electric cylinder to drive the movable pulley to perform a sinusoidal reciprocating motion, thereby driving the wave sensor to be tested to perform a sinusoidal reciprocating motion. The analysis of the lifting and lowering motion curves determines the actual motion data, including: The statistical value of the vertical distance between the highest point reached in the rise and fall motion curve and the adjacent lowest point reached is determined to obtain the actual wave height of the wave sensor to be tested. By determining the statistical value of the time between two consecutive times the highest point of the rise and fall in the rise and fall motion curve, the actual wave period of the wave sensor to be tested is obtained.

8. The verification device according to claim 1, characterized in that, The calibration of the wave sensor to be calibrated includes: The telescopic rods of the servo electric cylinders are controlled to drive the movable pulley to perform multiple reciprocating motions in the form of a sine wave. The theoretical wave height and theoretical wave period of each reciprocating motion in the form of a sine wave are different. The error between the measured motion data and the actual motion data of each reciprocating motion is calculated to obtain the verification error. The verification error of each reciprocating motion is combined to obtain the verification result of the wave sensor to be verified.

9. The verification device according to claim 1, characterized in that, The mounting bracket adopts an assembly structure and includes a horizontal bracket and a lifting bracket. The lifting bracket is placed vertically, and the horizontal bracket is placed horizontally and fixed on the lifting bracket. The servo electric cylinder and the pulley group are installed on the surface of the horizontal bracket along the horizontal direction. When there is an obstruction at the location of the mounting bracket, adjust the height of the lifting bracket so that the surface of the horizontal bracket is higher than the upper surface of the obstruction, so that the connecting rope that passes around the pulley group extends from the surface of the horizontal bracket to the other side of the obstruction and connects the wave sensor to be tested in a free suspension state.

10. The verification device according to claim 1, characterized in that, The verification method implemented using the aforementioned verification device further includes: The theoretical wave height of the wave sensor under test during its reciprocating motion is determined by analyzing the wave spectrum data. The verification scenario is determined based on the theoretical wave height, and the verification device is built within the verification scenario. After the verification device is built within the verification scenario, the wave sensor to be verified is in a free suspension state within the verification scenario, and the free rise and fall height of the wave sensor to be verified within the verification scenario is greater than the theoretical wave height.

Images