CN115420908A - A wind direction verification device and verification method for an ocean wind measuring instrument - Google Patents

Abstract

The invention discloses a wind direction calibrating device and a wind direction calibrating method for an ocean wind meter, belonging to the technical field of wind direction calibration of ocean wind meters, wherein the device comprises a base, wherein the center of the base is provided with a rotating circular table, and the upper end of the rotating circular table is connected with a mounting seat; a motor II and an angle encoder II are arranged in the base, the motor II is connected with the rotary circular table in a driving mode, and the angle encoder II is connected with the rotary circular table; the upper surface of the base is provided with a rotary ring table around the mounting seat, an electric telescopic rod is vertically arranged on the rotary ring table, and the top end of the electric telescopic rod is connected with a gripper; a motor I and an angle encoder I are arranged in the base, the motor I is in driving connection with a rotary ring table, and the rotary ring table is connected with the angle encoder I; the wind-direction monitoring device is characterized by further comprising a controller for controlling the wind-tunnel frequency converter and collecting wind-direction output of the ocean wind meter, wherein the controller is connected with the motor I, the angle encoder I, the gripper, the motor II and the angle encoder II. The wind direction detection device is simple and reasonable in structure, can conveniently and accurately detect the wind direction of the ocean wind meter, and improves the wind direction detection efficiency.

Description

A wind direction verification device and verification method for an ocean wind measuring instrument

technical field

The invention belongs to the technical field of wind direction verification of a marine anemometer, and in particular relates to a wind direction verification device and a verification method of a marine anemometer.

Background technique

Propeller-type marine anemometer: an instrument for measuring wind direction and wind speed; referring to accompanying drawing 1, its structure includes a cup body 61 (housing or base), and the top of the cup body 61 is connected with a wind vane 63 through a rotating shaft 62 A wind direction measuring component is arranged inside the cup body 61, and when relative rotation occurs between the wind vane 63 and the cup body 61, the wind direction measuring component can obtain the rotation angle value and convert it into a wind direction value output.

Propeller-type ocean wind measuring instruments need to carry out wind direction verification. Wind direction verification includes two items. One is the detection of wind direction indication value, that is, the detection of wind direction accuracy. The second is the verification of the flexibility of the wind direction rotation axis 62, that is, the wind direction start wind speed verification, the measurement index is the wind speed value, and the regulations stipulate that it should be less than or equal to 0.5 m/s.

Verification for wind direction indication:

At present, the domestic meteorological industry measurement institutions use standard dials for wind direction verification of marine anemometers. The following problems exist in the use of measuring dials as standard measuring instruments:

(1) The dial cannot directly output the measurement results. If it is used in a wind tunnel, manual readings are not feasible, and only machine vision can be used. The diameter of the working section measured by the wind direction sensor is 1.3 meters. The dial is installed at the bottom of the wind tunnel, and the camera is installed At the top, the shooting accuracy is not enough. If a bracket is used for installation, on the one hand, it will affect the flow field, and on the other hand, the instability of the lens will affect the shooting quality and increase the cost of use; and the use of machine vision will introduce another source of uncertainty.

(2) The maximum allowable error of the accuracy index of the dial is ±0.5°, while the lowest third-class circular indexing standard measuring instrument index in JJG 2057-2006 "Plane Angle Measuring Instrument Verification System Table" requires the maximum allowable error: ± 0.5″, the accuracy of the dial is far lower than this index, which does not meet the measurement transmission requirements of the verification system table, and cannot be used as a measurement standard instrument for the establishment of a wind direction sensor.

(3) At present, there is no current effective national verification regulation or calibration specification for the traceability of the dial, and it cannot be directly used as a standard instrument to establish a standard.

The above three problems are the fundamental reasons why the wind direction measurement standard cannot be established so far. If the measurement standard cannot be established, the wind direction measurement data cannot be traced back to the national benchmark. This is a technical problem existing in the verification process of wind direction indication at present.

Initiate wind speed verification for wind direction:

When checking the wind direction and starting wind speed of the propeller-type marine anemometer, it is necessary to deflect the wind vane of the propeller-type marine anemometer installed in the wind tunnel in advance, and then control the output frequency of the frequency converter to generate a slowly increasing airflow in the wind tunnel. Then judge whether the wind vane rotates and is consistent with the airflow direction, collect, record, and save the airflow velocity when the direction is consistent. At present, the deflection of the wind vane and the control of the frequency converter in the above steps require manual operation, and the observation of the rotation of the wind vane can only be performed visually because the propeller-type marine anemometer submitted for inspection does not have a display device, and because of the control equipment and The wind tunnel is divided into two spaces, the control room and the working room, resulting in the inconvenience of manual operation and coordination, and the verification operation is more inconvenient, which affects the efficiency of the verification work.

In order to solve the technical problems involved in the verification of wind direction indication and wind direction starting wind speed, we conducted in-depth research and analysis from the aspects of equipment principle structure and measurement performance indicators, and proposed a wind direction verification device and verification method for marine anemometers.

Contents of the invention

In order to overcome the above technical problems, the present invention provides a wind direction verification device and verification method for a marine anemometer, which is used for the verification of the wind direction indication value of the propeller type marine anemometer and the starting wind speed of the wind direction, which can reduce the test error and improve the verification result The accuracy makes the test more convenient, reduces the difficulty of the verification operation, and improves the verification efficiency.

The present invention adopts following technical scheme:

A wind direction verification device for a marine anemometer, comprising a base installed horizontally on the inner bottom of a wind tunnel, a rotating round table is installed in the center of the base, the rotation axis of the rotating round table is vertical, and the upper end of the rotating round table is located outside the base And the mounting base is coaxially connected, the lower end of the rotary table is located in the base; a motor II and an angle encoder II are fixed inside the base, the motor II is driven to connect to the rotary table, and the angle encoder II is connected to the rotary table;

The upper surface of the base rotates horizontally around the mounting seat to set a rotating ring platform. The rotation center of the rotating ring platform is its center, which is located on the central axis of the mounting seat. The rotating ring platform is embedded, and its bottom The end is located in the base, the upper surface of the rotating ring platform is flush with the upper surface of the base, an electric telescopic rod is vertically arranged on the rotating ring platform, and the top of the electric telescopic rod is connected with a gripper; Motor 1 and angle encoder 1, described motor 1 drives and connects the rotary ring platform, and described rotary ring platform connects angle encoder 1;

It also includes a controller for controlling the wind tunnel frequency converter and collecting the wind direction output data of the propeller-type marine anemometer to be detected. The controller controls and connects the motor I, the angle encoder I, the gripper, the motor II and the angle encoder II.

Preferably, a fixed plate is horizontally fixed in the base, and the motor I, the angle encoder I, the motor II and the angle encoder II are all installed on the fixed plate.

Preferably, a central platform is set between the rotating ring platform and the rotating round platform, the central platform is fixedly connected to the fixed plate, the central platform is connected to the rotating ring platform in rotation, and the central platform and the rotating circular platform rotate connected, the upper surface of the central platform is flush with the upper surface of the rotating ring platform.

Preferably, alignment marks are provided on the inner ring of the rotating ring platform and the outer ring of the central platform, and alignment marks are also provided on the outer ring of the rotating ring table and the base.

Preferably, the part of the rotating circular platform located in the base is fixedly sleeved with a ring gear, the motor II is connected to a gear, and the gear meshes with the ring gear, and the part of the rotating circular platform located in the base is fixedly sleeved with a driven pulley, Described motor 1 is connected driving pulley, and described driving pulley is connected with driven pulley by belt.

Preferably, the radius of the gear is smaller than that of the ring gear, and the radius of the driving pulley is smaller than that of the driven pulley.

Preferably, the gripper uses flexible servo grippers, and the motors I and II use high-precision planetary reducers.

Preferably, the rotating shaft of the angle encoder II is coaxially and rigidly connected to the rotary table. .

A method for verifying the wind direction of a marine anemometer, comprising the following steps:

S1: Carry out wind direction start wind speed verification

S11: Install the base horizontally on the bottom of the wind tunnel in advance, and install the propeller-type marine anemometer to be inspected on the mounting base;

When installing the propeller marine anemometer, it is determined by the output value of the alignment mark and the angle encoder I that the electric telescopic rod is located on the leeward side of the mounting base, and the angle of the wind vane is positioned so that the wind vane is along the airflow axis of the wind tunnel, and the controller sets this The wind direction output of the marine anemometer is set to 0°;

S12: The controller controls the electric telescopic rod to rise, and controls the handle to clamp the wind vane, and then controls the motor I to drive the rotating ring table to rotate through the belt, and the rotating ring table drives the electric telescopic rod to drive the handle to drive the wind vane to deflect. When the wind vane deflects, keep the installation The seat does not move, so as to ensure that the cup body does not move, so that relative rotation occurs between the wind vane and the cup body; the controller rotates the wind vane to a position at an acute angle of 10° away from the airflow axis according to the output value of the angle encoder I, and controls the wind vane when it is in place. Handle (relax the wind vane and control the electric telescopic rod to drive the hand down, so that the wind vane is in a free state;

S13: Start the wind tunnel, the controller controls the frequency converter of the wind tunnel to generate a slowly increasing airflow in the wind tunnel. During the gradual increase of the airflow, the controller simultaneously collects the wind tunnel wind speed and the wind direction output of the propeller-type marine anemometer. When the wind direction output of the ocean anemometer returns to 0°, record the airflow velocity at this time, which is recorded as A, and the unit of A is m/s; compare the technical indicators of the regulations to determine whether the wind direction of the ocean anemometer is qualified, and complete Wind direction start wind speed automatic verification;

The specific judging method is: if the value of A is less than or equal to 0.5 m/s, it is determined that the verified propeller-type marine anemometer is qualified; if the value of A is greater than 0.5 m/s, it is determined that the verified propeller-type marine anemometer is not qualified;

S2: Carry out the verification of wind direction indication value

S21: Install the base horizontally on the bottom of the wind tunnel in advance, and install the propeller-type marine anemometer to be inspected on the mounting base; electrically connect the controller with the wind direction measurement component in the propeller-type marine anemometer to obtain The output value of the wind direction of the propeller-type marine anemometer;

S22: Start the wind tunnel, and the controller will generate a stable airflow of 5 m/s in the wind tunnel, so that the position of the wind vane tail of the propeller-type marine anemometer is fixed at the airflow axis and remains unchanged; the controller controls the motor II to start, and the motor II drives The gear rotates, and the gear rotates to drive the meshing ring gear to rotate. The ring gear rotates to drive the rotating round table to rotate, and then drives the mounting seat to rotate, thereby driving the cup body of the propeller-type marine anemometer to rotate. Because the wind vane cannot rotate under the action of stable airflow , at this time, relative rotation occurs between the cup body and the wind vane through the rotating shaft. When the wind direction output of the propeller-type marine wind gauge is rotated to 0°, the output value of the angle encoder II is set to 0° at this time;

S23: The controller controls the motor II to continue to rotate, and the motor II drives the rotating round table and the mounting base to rotate, and then drives the wind cup of the propeller-type marine anemometer to rotate to a certain verification point and then stops rotating. The verification point is coaxial with the rotating round table The connected angle encoder II accurately locates the angular position of the verification point, and the angle encoder II outputs the standard angle value of the verification point, which is collected by the controller and recorded as the standard angle value;

S24: Since there is a stable airflow of 5 m/s in the wind tunnel, the position of the wind vane tail of the propeller-type marine anemometer is fixed at the airflow axis and remains unchanged; when the cup of the propeller-type marine anemometer rotates, the cup Relative movement with the wind vane is equivalent to a change in wind direction. At this time, the controller directly collects the wind direction output value of the propeller-type marine wind gauge when the propeller-type marine wind gauge is at the verification point, records it as the detection wind direction indication value, and stores the wind direction output value of the propeller-type marine wind gauge Compare the detected wind direction indication value with the standard angle value correspondingly output by the angle encoder II in S23, determine whether the ocean anemometer is qualified according to the technical index requirements of the regulations, and complete the automatic verification of the ocean anemometer indication value;

Among them, the specific method for judging whether the propeller-type marine anemometer is qualified is: since the measurement accuracy of the propeller-type marine anemometer is ±5°, the measurement accuracy of the angle encoder II is ±0.5″, where 1°=3600 ", the two rotate the same angle, and the measured values obtained are different; that is, the detected wind direction indication value minus the standard angle value is the error value, and the error value is compared with the maximum allowable value specified in the technical indicators of the regulations. The error is ±5° for comparison. If the obtained error value is within the maximum allowable error range, it is judged that the detected marine anemometer is qualified; otherwise, it is judged as unqualified. .

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention is provided with a rotating round table, motor II, angle encoder II, mounting base and controller. When performing wind direction indication verification, the wind speed in the wind tunnel is kept constant, and the controller drives the propeller type marine anemometer by controlling the motor II. After the cup body rotates to the verification point, the controller compares the wind direction value output by the propeller-type marine anemometer with the standard angle value output by the angle encoder II, and then judges whether the marine anemometer is qualified according to the technical specifications of the regulations , the motor II and the angle encoder II can automatically rotate the cup to the verification point and output the standard angle value accurately, without using human eyes or machine vision to read the standard angle, reducing test errors, more accurate display verification results, and easier operation convenient;

2. The present invention uses the angle encoder II as the standard reference for the measurement of the marine anemometer indication verification standard. The angle encoder has the currently effective national JJF 1115-2004 "Calibration Specification for Photoelectric Shaft Angle Encoder" to realize the traceability of the value. It meets the requirements of standard measurement instruments used for standard construction, and can meet the measurement performance requirements of national verification regulations JJG1167-2019 "Marine Wind Measuring Instruments" for wind direction measurement standard instruments, and its measurement performance can meet the national verification system table JJG 2057-2006 "Plane Angle Measurement The accuracy index of the third-class circular indexing standard measuring instruments in the Apparatus Verification System Table, that is, the maximum allowable error: ±0.5", this error is 1/3600 of the dial, and the accuracy is greatly improved.

3. The present invention is provided with mounting base, rotating ring platform, electric telescopic rod, gripper, motor 1, angle encoder 1 and controller, and when carrying out the start-up wind speed verification, the propeller type marine anemometer is installed on the mounting base for zero adjustment in advance , and then the controller drives the wind vane to rotate by controlling the operation of the motor I, the electric telescopic rod and the gripper, and according to the output value of the angle encoder I, the rotating ring table is rotated by 10°, so that the wind vane rotates to deviate from the airflow axis of the wind tunnel 10°acute angle position, then the controller controls the wind tunnel inverter to generate gradually increasing airflow, and collects the wind speed and the wind direction output of the propeller-type marine anemometer to be detected. When the wind direction output of the propeller-type marine anemometer returns to zero, record the wind speed Comparing with the requirements of the technical indicators of the regulations, it can be judged whether the wind direction and starting wind speed of the propeller-type marine anemometer is qualified, and the starting wind speed verification is automatically performed, which reduces the operation difficulty of the starting wind speed verification and improves the verification efficiency;

4. In the present invention, motor I and motor II adopt high-precision planetary reducers, and their transmission is decelerated again to improve the accuracy of the rotation angle of the rotating ring table and the rotating round table, and improve the accuracy of the verification results. The gripper adopts a flexible servo clamp The claws can accurately and stably hold the wind vane of the propeller-type marine anemometer, reduce the rotation error and prevent damage to the wind vane.

Description of drawings

Fig. 1 is the overall schematic diagram of the present invention;

Fig. 2 is a structural representation of the present invention (remove the base);

Fig. 3 is a side view of the structure of the present invention (the base is removed).

Explanation of reference signs:

1. Base; 2. Alignment mark; 3. Rotating ring platform; 4. Rotating round platform; 5. Mounting seat; 9 angle encoder I; 10 motor I; 11 central platform; 12 angle encoder II; 13 motor II; 14 fixed plate; 15 driving pulley; 16 passive pulley; 17 gear;

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

A wind direction verification device for a marine anemometer, comprising a base 1 horizontally installed on the inner bottom of a wind tunnel, a rotating round table 4 is installed in the center of the base 1, the rotation axis of the rotating round table 4 is vertical, and the upper end of the rotating round table 4 is located outside the base 1 And coaxially connected to the mounting base 5, the lower end of the rotary table 4 is located in the base 1; the motor II13 and the angle encoder II12 are fixedly installed inside the base 1, the motor II13 is driven and connected to the rotary table 4, and the angle encoder II12 is connected to the rotary table 4; the base 1 The upper surface of the upper surface rotates horizontally around the mounting seat 5 to set the rotating ring platform 3. The rotation center of the rotating ring platform 3 is its center of circle, and its center of circle is located on the central axis of the mounting seat 5. The rotating ring platform 3 is embedded, and its bottom is located at In the base 1, the upper surface of the rotating ring platform 3 is flush with the upper surface of the base 1 to ensure the flatness of the surface and prevent unnecessary influence on the air flow. The top of the rod 7 is connected to the gripper 8; the base 1 is provided with a motor I10 and an angle encoder I9, and the motor I10 drives and connects the rotary ring table 3, and the rotary ring table 3 is connected to the angle encoder I9, specifically, the rotary ring table 3 is located in the base 1 Part of the outer circumference of the angle encoder 19 abuts against the rotating shaft wheel of the angle encoder 19, and when the rotating ring platform 3 rotates, it drives the rotating shaft of the angle encoder 19 to rotate through friction; the device also includes controlling the wind tunnel frequency converter and collecting the wind direction of the ocean anemometer 6 to be detected The controller for outputting data, the controller is connected with the motor I10, the angle encoder I9, the gripper 8, the motor II13 and the angle encoder II12, and the controller collects the voltage data by connecting the output line of the ocean anemometer 6 submitted for inspection to obtain the ocean The wind direction output of the anemometer 6, the controller is set in the computer in the control room; when performing the value verification test of the ocean anemometer 6, the wind speed in the wind tunnel is kept constant, and the controller drives the wind speed of the ocean anemometer 6 through the motor II13. After the cup rotates to the verification point, the angle value output by the marine anemometer 6 is collected at the same time, and the angle value is compared with the standard angle value collected from the angle encoder II12 in parallel, and combined with the requirements of the technical indicators of the regulations, the ocean can be judged. Whether the indication value of the anemometer 6 is qualified or not, the standard angle value used as a reference is output by the angle encoder II12, which has higher precision and does not need human eyes or machine vision readings, which reduces test errors, makes the verification results more accurate, and the verification operation is also more convenient , to improve the verification efficiency; when performing the wind speed verification of the propeller-type marine anemometer 6, through the cooperation of the motor I10, the angle encoder I9, the electric telescopic rod 7 and the gripper 8, the wind vane of the propeller-type marine anemometer 6 is driven. Pre-deflection, and then the controller controls the wind tunnel frequency converter to generate gradually increasing airflow, and collects the wind speed and the wind direction output of the propeller-type marine anemometer 6. When the wind direction output of the propeller-type marine anemometer 6 returns to zero, record the wind speed. Comparing the technical specifications of the regulations, it is possible to judge whether the starting wind speed of the marine anemometer 6 is qualified, and the starting wind speed verification is carried out automatically, without manual deflection of the wind vane and control of the rotation of the frequency converter and the visual vane, reducing the start of the wind direction of the marine anemometer 6. The operation difficulty of wind speed verification improves the verification efficiency Rate.

In order to stably install each component, the fixed plate 14 is fixed horizontally in the base 1, and the motor I10, angle encoder I9, motor II13 and angle encoder II12 are all installed on the fixed plate 14; The central platform 11, the central platform 11 is fixedly connected with the fixed plate 14, the central platform 11 is rotationally connected with the rotating ring platform 3, the central platform 11 is rotationally connected with the rotating round platform 4, and the upper surface of the central platform 11 is connected with the rotating ring platform 3 The upper surface of the wind tunnel is even, which also ensures that the surface is flat and prevents unnecessary influence on the airflow in the wind tunnel.

In order to facilitate the initial adjustment of the position of the electric telescopic rod 7 and the installation of the marine anemometer 6, an alignment mark 2 is provided on the inner ring of the rotating ring platform 3 and the outer ring of the central platform 11. The base 1 is also equipped with an alignment mark 2. When the alignment marks 2 are aligned with each other, the electric telescopic rod 7 is accurately located on the leeward side of the mounting seat 5, and the alignment mark 2 is also used for the correct installation of the propeller-type marine wind gauge 6. to prompt.

In order to ensure the control accuracy when controlling the rotation of the rotary table 4, the part of the rotary table 4 located in the base 1 is fixedly sleeved with the ring gear 18, the motor II13 is connected to the gear 17, the gear 17 meshes with the ring gear 18, and the rotary table 3 is located at the base 1 The inner part is fixedly set with the driven pulley 16, the motor I10 is connected with the driving pulley 15, and the driving pulley 15 is connected with the driven pulley 16 belt; and the radius of the gear 17 is less than the radius of the ring gear 18, and the radius of the driving pulley 15 is less than The radius of the passive pulley 16; the gripper 8 adopts flexible servo grippers, which can accurately and stably clamp the wind vane, and the motor I10 and motor II13 adopt high-precision planetary reducers.

The rotating shaft of the angle encoder II12 is rigidly connected with the rotary table 4 coaxially.

The above-mentioned method for verifying the wind direction of the marine anemometer comprises the following steps:

S1: Carry out wind direction start wind speed verification

S11: Install the base 1 horizontally on the bottom of the wind tunnel in advance, and install the propeller-type marine anemometer 6 to be inspected on the mounting base 5;

When the propeller-type ocean wind measuring instrument 6 is installed, it is determined by the output value of the alignment mark 2 and the angle encoder 19 that the electric telescopic rod 7 is located on the leeward side of the mounting seat 5, and the angle of the wind vane 63 is positioned so that the wind vane 63 is positioned along the wind tunnel. Airflow axis, the controller sets the wind direction output of the propeller-type marine anemometer 6 to 0° at this time;

S12: The controller controls the electric telescopic rod 7 to rise, and controls the handle 8 to clamp the wind vane 63, and then controls the motor I10 to drive the rotating ring table 3 to rotate through the belt, and the rotating ring table 3 drives the electric telescopic rod 7 to drive the handle 8 to drive the wind vane 63 Deflection, when the wind vane 63 deflects, keep the mounting seat 5 still, and then ensure that the cup body 61 is still, so that relative rotation occurs between the wind vane 63 and the cup body 61; the controller makes the wind vane 63 rotate according to the output value of the angle encoder I9. Rotate to a position at an acute angle of 10° away from the airflow axis, and when in place, control the handle 8 to release the wind vane 63 and control the electric telescopic rod 7 to drive the handle 8 down, so that the wind vane 63 is in a free state;

S13: Start the wind tunnel, the controller controls the frequency converter of the wind tunnel to generate a slowly increasing airflow in the wind tunnel. During the process of gradually increasing the airflow, the controller simultaneously collects the wind tunnel wind speed and the wind direction output of the propeller-type marine anemometer 6 , when the wind direction output of the marine anemometer returns to 0°, record the airflow velocity at this time, denoted as A, and the unit of A is m/s; compare the technical indicators of the regulations to determine the starting wind speed of the propeller-type ocean anemometer 6 wind direction Whether it is qualified or not, the automatic verification of wind direction and starting wind speed is completed;

The specific judging method is as follows: if the value of A is less than or equal to 0.5 m/s, it is determined that the verified propeller-type marine anemometer 6 is qualified; if the value of A is greater than 0.5 m/s, then the verified propeller-type marine anemometer is judged 6 unqualified;

S2: Carry out the verification of wind direction indication value

S21: Install the base 11 horizontally on the bottom of the wind tunnel in advance, and install the propeller-type marine anemometer 6 to be inspected on the mounting base 5; Connect to obtain the wind direction output value of the propeller-type marine anemometer 6;

S22: start the wind tunnel, the controller makes a stable airflow of 5 m/s in the wind tunnel, so that the position of the wind vane 63 tail of the propeller-type marine anemometer 6 is fixed on the airflow axis and remains unchanged; the controller controls the motor II13 to start, and the motor II13 drives the gear 17 to rotate, and the rotation of the gear 17 drives the meshed ring gear 18 to rotate, and the rotation of the ring gear 18 will drive the rotating round table 4 to rotate, and then drive the mounting seat 5 to rotate, thereby driving the cup body 61 of the propeller-type marine anemometer 6 to rotate , because the wind vane 63 cannot rotate under the action of the stable air flow, the relative rotation occurs between the cup body 61 and the wind vane 63 through the rotating shaft 62 at this time, when the wind direction output of the propeller-type ocean wind measuring instrument 6 is 0° when the rotation is reached, and the When the output value of the angle encoder II12 is set to 0°;

S23: The controller controls the motor II13 to continue to rotate, and the motor II13 drives the rotating round table 4 and the mounting seat 5 to rotate, and then drives the cup body 61 of the propeller-type ocean wind measuring instrument 6 to rotate to a certain verification point and then stops rotating. The angle encoder II12 connected coaxially with the rotary table 4 accurately locates the angular position of the verification point, and the angle encoder II12 outputs the standard angle value of the verification point, which is collected by the controller and recorded as the standard angle value;

S24: Due to the stable airflow of 5 m/s produced in the wind tunnel, the tail position of the wind vane 63 of the propeller-type marine anemometer 6 is fixed on the airflow axis and remains unchanged; when the cup body 61 of the propeller-type marine anemometer 6 rotates Afterwards, the relative movement between the cup body 61 and the wind vane 63 is equivalent to a change in the wind direction. At this time, the controller directly collects the wind direction output value of the propeller-type marine anemometer 6 when the propeller-type marine anemometer 6 is at the verification point, which is recorded as Detect the indicated value of the wind direction, and compare the detected wind direction indicated value with the standard angle value corresponding to the output of the angle encoder II12 in S23, and determine whether the marine anemometer is qualified according to the requirements of the technical indicators of the regulations, and complete the indicated value of the marine anemometer automatic verification;

Among them, the specific method for judging whether the propeller-type marine anemometer 6 is qualified is: since the measurement accuracy of the propeller-type marine anemometer 6 is ±5°, the measurement accuracy of the angle encoder II12 is ±0.5″, where 1° = 3600", the two rotate the same angle, and the measured values obtained are different; that is, the detected wind direction indication value minus the standard angle value is the error value, and the error value and the maximum allowable error stipulated in the regulations and technical indicators 5° for comparison, if the obtained error value is within the maximum allowable error range, it is determined that the detected marine anemometer 4 is qualified; otherwise, it is determined to be unqualified.

In this program, by setting the angle encoder II12, the angle encoder II12 has the currently valid national JJF1115-2004 "Calibration Specification for Photoelectric Shaft Angle Encoder" to realize the traceability of the value, which meets the requirements of the standard measuring standard equipment. Angle encoder II12 enables digital output of measurement results. The measurement performance of the angle encoder II12 can meet the accuracy index of the third-class circular indexing standard measuring instruments in the national verification system table JJG 2057-2006 "Plane Angle Measuring Instruments Verification System Table", that is, the maximum allowable error: ±0.5″, here The error is 1/3600 of the dial, and the accuracy is greatly improved. The angle encoder II12 can meet the measurement performance requirements of the national verification regulation JJG 1167-2019 "Marine Wind Measuring Instruments" for wind direction measurement standard instruments.

To sum up, the standard angle encoder II12 can be used as a wind direction measurement standard instrument to establish a wind direction measurement standard for marine anemometers.

Finally, the device has a simple structure and is easy to operate, and can be used for the verification of the wind direction indication value of the propeller-type marine anemometer and the start-up wind speed of the wind direction. When using this device for verification, the test error can be reduced, the accuracy of the verification result can be improved, and the test can be more accurate. It is convenient, reduces the difficulty of verification operation, and improves the efficiency of verification.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that: without departing from the principle and purpose of the present invention, various changes, modifications, substitutions and deformations can be made to the above embodiments, The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. A wind direction calibrating device of an ocean anemometer comprises a base (1) horizontally arranged at the inner bottom of a wind tunnel, and is characterized in that a rotary circular table (4) is rotatably arranged at the center of the base (1), the rotating axis of the rotary circular table (4) is vertical, the upper end of the rotary circular table (4) is positioned outside the base and is coaxially connected with a mounting seat (5), and the lower end of the rotary circular table (4) is positioned in the base (1); a motor II (13) and an angle encoder II (12) are fixedly arranged in the base (1), the motor II (13) is in driving connection with the rotary circular table (4), and the angle encoder II (12) is connected with the rotary circular table (4);

the upper surface of the base (1) is horizontally and rotatably provided with a rotary ring table (4) around a mounting seat (5), the rotary center of the rotary ring table (4) is the circle center of the rotary ring table, the circle center of the rotary ring table is located on the central axis of the mounting seat (5), the rotary ring table (4) is arranged in an embedded mode, the bottom end of the rotary ring table is located in the base (1), the upper surface of the rotary ring table (4) is flush with the upper surface of the base (1), an electric telescopic rod (7) is vertically arranged on the rotary ring table (4), and the top end of the electric telescopic rod (7) is connected with a gripper (8); a motor I (10) and an angle encoder I (9) are arranged in the base (1), the motor I (10) is in driving connection with the rotary ring table (4), and the rotary ring table (4) is connected with the angle encoder I (9);

the device is characterized by further comprising a controller for controlling the wind tunnel frequency converter and acquiring wind direction output data of the propeller type ocean anemometer (6) to be detected, wherein the controller is in control connection with a motor I (10), an angle encoder I (9), a hand grip (8), a motor II (13) and an angle encoder II (12).

2. The marine anemometer wind direction verification device according to claim 1, wherein a fixing plate (14) is horizontally and fixedly arranged in the base (1), and the motor I (10), the angle encoder I (9), the motor II (13) and the angle encoder II (12) are all mounted on the fixing plate (14).

3. The marine anemometer wind direction verification device according to claim 2, wherein a central platform (11) is disposed between the rotary circular table (3) and the rotary circular table (4), the central platform (11) is fixedly connected to the fixing plate (14), the central platform (11) is rotatably connected to the rotary circular table (3), the central platform (11) is rotatably connected to the rotary circular table (4), and an upper surface of the central platform (11) is flush with an upper surface of the rotary circular table (3).

4. The marine anemometer wind direction calibration apparatus according to claim 3, wherein an inner ring of the rotary ring table (3) is provided with an alignment mark (2) in cooperation with an outer ring of the central platform (11), and the outer ring of the rotary ring table (3) is also provided with an alignment mark (2) in cooperation with the base (1).

5. The marine anemometer wind direction verification device according to claim 4, wherein a gear ring (18) is fixedly sleeved on a portion, located in the base (1), of the rotary circular table (4), the motor II (13) is connected with a gear (17), the gear (17) is meshed with the gear ring (18), a driven pulley (16) is fixedly sleeved on a portion, located in the base (1), of the rotary circular table (3), the motor I (10) is connected with a driving pulley (15), and the driving pulley (15) is connected with the driven pulley (16) through a belt.

6. Marine anemometer anemometry unit according to claim 5, characterized in that the gear (17) has a smaller radius than the ring gear (18) and the driving pulley (15) has a smaller radius than the driven pulley (16).

7. The marine anemometer wind direction calibration device according to claim 1, characterized in that the hand grip (8) adopts a flexible servo clamping jaw, and the motor I (10) and the motor II (13) adopt high-precision planetary speed reducers.

8. The marine anemometer anemometry unit according to claim 1, characterized in that the axis of rotation of the angular encoder II (12) is rigidly connected coaxially to the rotary truncated cone (4).

9. A method for calibrating the wind direction of an ocean wind meter, which is characterized in that the method for calibrating the wind direction of the ocean wind meter according to any one of claims 1 to 8 is adopted, and comprises the following steps:

s1: wind direction starting wind speed verification

S11: the base (1) is horizontally arranged at the bottom in the wind tunnel in advance, and a to-be-detected propeller type ocean anemometer (6) is arranged on the mounting seat (5);

when the propeller type ocean anemometer (6) is installed, the electric telescopic rod (7) is determined to be positioned on the leeward side of the installation base (5) through the output values of the alignment mark (2) and the angle encoder I (9), the angle of the wind vane (63) is positioned, the wind vane (63) is made to be along the axis of wind tunnel airflow, and the wind direction output of the propeller type ocean anemometer (6) is set to be 0 degree through the controller;

s12: the controller controls the electric telescopic rod (7) to ascend, controls the gripper (8) to clamp the wind vane (63), controls the motor I (10) to drive the rotary ring table (3) to rotate through a belt, drives the electric telescopic rod (7) to drive the gripper (8) to drive the wind vane (63) to deflect, keeps the mounting seat (5) motionless when the wind vane (63) deflects, further ensures that the cup body (61) is motionless, and enables the wind vane (63) and the cup body (61) to rotate relatively; the controller enables the wind vane (63) to rotate to an acute angle position deviating from the airflow axis by 10 degrees according to the output value of the angle encoder I (9), and controls the hand grip (8) to loosen the wind vane (63) and controls the electric telescopic rod (7) to drive the hand grip (8) to descend after the wind vane (63) is in a free state;

s13: starting the wind tunnel, controlling a wind tunnel frequency converter by a controller to enable the wind tunnel to generate slowly increasing airflow, simultaneously acquiring wind speed of the wind tunnel and wind direction output of a propeller type ocean anemometer (6) by the controller in the process of gradually increasing the airflow, and recording the current airflow speed as A when the wind direction output of the ocean anemometer is restored to 0 degree, wherein the unit of A is meter/second; comparing the requirements of the specification technical indexes to judge whether the wind direction starting wind speed of the propeller type ocean anemometer (6) is qualified or not, and completing automatic verification of the wind direction starting wind speed;

the specific judging method comprises the following steps: if the value of A is less than or equal to 0.5 m/s, the detected propeller type ocean anemometer (6) is judged to be qualified; if the value of A is more than 0.5 m/s, the detected propeller type ocean anemometer (6) is judged to be unqualified;

s2: performing wind direction indication value verification

S21: the base (1) (1) is horizontally arranged at the bottom in the wind tunnel in advance, and a propeller type ocean anemometer (6) to be detected is arranged on the mounting seat (5); electrically connecting the controller with a wind direction measuring component arranged in the propeller type ocean anemometer (6) to obtain a wind direction output value of the propeller type ocean anemometer (6);

s22: starting the wind tunnel, and enabling the controller to generate 5 m/s stable airflow in the wind tunnel, so that the tail wing position of a wind vane (63) of the propeller type ocean anemometer (6) is fixed on the airflow axis and is kept unchanged; the controller controls a motor II (13) to be started, the motor II (13) drives a gear (17) to rotate, the gear (17) rotates to drive a meshed gear ring (18) to rotate, the gear ring (18) rotates to drive a rotary circular table (4) to rotate, and then a mounting seat (5) is driven to rotate, so that a cup body (61) of a propeller type ocean anemometer (6) is driven to rotate, because a wind vane (63) cannot rotate under the action of stable airflow, the cup body (61) and the wind vane (63) rotate relatively through a rotating shaft (62), when the wind vane rotates to the propeller type ocean anemometer (6), the wind direction output is 0 degree, and the output value of an angle encoder II (12) is set to be 0 degree;

s23: the controller controls the motor II (13) to continue rotating, the motor II (13) drives the rotating circular truncated cone (4) and the mounting seat (5) to rotate, then the cup body (61) of the propeller type ocean wind meter (6) is driven to rotate to a certain detection point and then stops rotating, the detection point accurately positions the angle position of the detection point through an angle encoder II (12) coaxially connected with the rotating circular truncated cone (4), and the angle encoder II (12) outputs a standard angle value of the detection point, and the standard angle value is collected by the controller and recorded as a standard angle value;

s24: because stable airflow of 5 m/s is generated in the wind tunnel, the tail position of a wind vane (63) of the propeller type ocean anemometer (6) is fixed on the axis of the airflow and remains unchanged; after a cup body (61) of the propeller type ocean anemometer (6) rotates, the cup body (61) and a wind vane (63) move relatively, and wind direction changes, at the moment, a controller directly collects a wind direction output value of the propeller type ocean anemometer (6) at a detection point and records the wind direction output value as a detection wind direction indicating value, the detection wind direction indicating value is compared with the standard angle value correspondingly output by an angle encoder II (12) in S23, whether the ocean anemometer is qualified or not is judged according to the requirement of a procedure technical index, and the automatic detection of the indication value of the ocean anemometer is completed;

the specific method for judging whether the propeller type ocean anemometer (6) is qualified or not comprises the following steps: since the measurement accuracy of the propeller type marine anemometer (6) is ± 5 °, the measurement accuracy of the angle encoder II (12) is ± 0.5 ", wherein 1 ° = 3600", both rotated by the same angle, the obtained measurement values are different; subtracting the standard angle value from the detected wind direction indicating value to obtain an error value, comparing the error value with a maximum allowable error +/-5 degrees specified by the specification technical index requirement, and if the obtained error value is within the maximum allowable error range, judging that the detected ocean anemometer (4) is qualified; otherwise, the product is judged to be unqualified.

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