An induction loop test system and method

Abstract

The present invention belongs to the field of maglev train testing, and specifically relates to an inductive loop testing system and method, which includes a rotating device, an on-vehicle transmitting antenna, and a plurality of cross inductive loop units. The rotating device includes a rotating driving member and a turntable arranged on the output shaft of the rotating driving member. The on-vehicle transmitting antenna is fixedly arranged on the turntable. The plurality of cross inductive loop units are arranged in a ring shape and coaxially arranged outside the turntable. It also includes a reference position detection module for detecting the actual position of the on-vehicle transmitting antenna and a test position detection module for detecting the relative position of the on-vehicle transmitting antenna in the cross inductive loop unit. The present invention can reduce the size of the inductive loop testing device, improve the moving speed of the on-vehicle transmitting antenna, and can also ensure a constant gap between the on-vehicle transmitting antenna and the cross inductive loop unit, making the test data obtained from the simulation test consistent with the actual operating condition data, and ensuring the reliability and accuracy of the test data.

Description

Technical Field

[0001] The present invention belongs to the field of maglev train testing, and particularly relates to an inductive loop test system and method. Background Art

[0002] The inductive loop test system provides a test and verification platform for the feasibility of the speed measurement and positioning technology based on the inductive loop for medium-speed maglev trains, so as to provide a technical basis for the engineering research and implementation of the speed measurement and positioning system of medium-speed maglev trains.

[0003] The Chinese invention patent "CN202111678923.9 An experimental platform for the speed measurement and positioning system of a maglev vehicle" and the Chinese utility model patent "CN202123426743.X An inductive loop device for positioning test" both propose a test device. In this test method, the on-vehicle transmitting antenna is simulated to move in a straight-line moving manner. The linear driving mechanism often has a complex structure, including a driving part and a linear moving part. It is difficult to accurately position the actual position of the on-vehicle transmitting antenna, and at the same time, it is difficult to simulate the test at the same moving speed as the actual movement of the maglev train, making the test data difficult to approach the actual working conditions of the maglev train. In addition, the entire test equipment has a large size, a complex structure, and a high cost, which provides certain difficulties for the research on the speed measurement and positioning technology of the inductive loop. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an inductive loop test system and method with a simple structure and capable of more easily approaching the actual moving speed of the maglev train.

[0005] The present invention provides an inductive loop test system, including a rotating device, an on-vehicle transmitting antenna, and a plurality of cross inductive loop units. The rotating device includes a rotation driving part and a turntable arranged on the output shaft of the rotation driving part. The on-vehicle transmitting antenna is fixedly arranged on the turntable. The plurality of cross inductive loop units are arranged in a ring shape and coaxially arranged outside the turntable. It also includes a reference position detection module for detecting the actual position of the on-vehicle transmitting antenna and a test position detection module for detecting the relative position of the on-vehicle transmitting antenna in the cross inductive loop unit.

[0006] Furthermore, the radial distance between the cross inductive loop unit and the turntable is adjustable.

[0007] The inductive loop test system of the present invention further includes a fixed disk. The plurality of cross inductive loop units are slidably arranged on the fixed disk along the diameter direction of the fixed disk, and further includes a locking structure for locking the position of the cross inductive loop unit in the sliding stroke.

[0008] The inductive loop test system of the present invention further includes a gap adjusting mechanism for driving the cross inductive loop unit to slide along the diameter direction of the fixed disk.

[0009] The present induction loop test system further includes a bracket, and both the fixed disk and the rotation driving member are fixedly arranged on the bracket.

[0010] Furthermore, two or more vehicle-mounted transmitting antennas are arranged in a circular array along the axis of the turntable.

[0011] The present induction loop test system further includes a short-circuit fault switch connected to one or more cross induction loop units.

[0012] The present induction loop test system further includes an open-circuit fault switch connected to the cross induction loop unit.

[0013] Furthermore, the rotation driving member is a permanent magnet synchronous rotary servo motor, and the reference position detection module is a resolver.

[0014] The present invention also provides an induction loop test method, which uses the induction loop test system, and is characterized by including the following steps:

[0015] The rotation driving member drives the turntable and the vehicle-mounted transmitting antenna to rotate;

[0016] The reference position detection module detects the actual position of the turntable;

[0017] The test position detection module detects the relative position of the vehicle-mounted transmitting antenna on a plurality of cross induction loop units;

[0018] Collect the data of the reference position detection module and the test position detection module for comparison and analysis.

[0019] The beneficial effects of the present invention are as follows: in the present invention, a plurality of cross induction loop units arranged in a straight line in the conventional induction loop test device are changed to be arranged in a circular shape, and the vehicle-mounted transmitting antenna that linearly moves along the plurality of cross induction loop units arranged in a straight line in the conventional device is changed to a rotary motion, which can reduce the size of the induction loop test device, make the structure simpler and more reliable, lower the cost, at the same time, can increase the moving speed of the vehicle-mounted transmitting antenna, and can also ensure a constant gap between the vehicle-mounted transmitting antenna and the cross induction loop units, so that the test data obtained from the simulation test is consistent with the data of the actual use conditions, ensuring the reliability and accuracy of the test data. In addition, changing the linear movement to a rotary motion can make the structure of the reference position detection module for detecting the actual position of the vehicle-mounted transmitting antenna simpler and the detected data more accurate. In addition, the conventional test method can only perform reciprocating tests or interval one-way tests, while after the vehicle-mounted transmitting antenna is changed to a rotary motion, it can perform long-term high-speed state tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 is an exploded structural view of the present invention.

[0021] Appended Figure 2 is the structural schematic diagram of the present invention.

[0022] Appended Figure 3 is the schematic diagram of the present invention.

[0023] Appended Figure 4 is the schematic diagram of the gap between the cross induction loop unit and the vehicle-mounted transmitting antenna in the present invention.

[0024] Appended Figure 5 is the schematic diagram of the static accuracy test data in the present invention.

[0025] Appended Figure 6 is the schematic diagram of the dynamic performance test data in the present invention.

[0026] Appended Figure 7 is the schematic diagram of the short-circuit fault simulation test data in the present invention.

[0027] Appended Figure 8 is the schematic diagram of the open-circuit fault simulation test data in the present invention.

[0028] In the figure, 1 - cross induction loop unit; 2 - vehicle-mounted transmitting antenna; 3 - rotation driving member; 4 - turntable; 5 - fixed disk; 6 - bracket; 7 - resolver; 8 - safety protection cover. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] As shown in the Figure 1-8 accompanying drawings, the present invention provides an inductive loop test system, which includes a rotating device, a vehicle-mounted transmitting antenna 2, and a plurality of cross inductive loop units 1. The rotating device includes a rotation driving member 3 and a turntable 4 arranged on the output shaft of the rotation driving member 3. The vehicle-mounted transmitting antenna 2 is fixedly arranged on the turntable 4. The plurality of cross inductive loop units 1 are arranged in a ring shape and coaxially arranged outside the turntable 4. The system further includes a reference position detection module for detecting the actual position of the vehicle-mounted transmitting antenna 2 and a test position detection module for detecting the relative position of the vehicle-mounted transmitting antenna 2 in the cross inductive loop units 1.

[0035] In the present invention, the plurality of cross inductive loop units 1 arranged in a straight line in the conventional inductive loop test device are changed to be arranged in a ring shape, and the vehicle-mounted transmitting antenna 2 that linearly moves along the plurality of cross inductive loop units 1 arranged in a straight line in the conventional device is changed to a rotational movement. This can reduce the size of the inductive loop test device, make the structure simpler and more reliable, and lower the cost. At the same time, it can increase the moving speed of the vehicle-mounted transmitting antenna 2, and can also ensure a constant gap between the vehicle-mounted transmitting antenna 2 and the cross inductive loop units 1, making the test data obtained from the simulation test consistent with the actual operating condition data, and ensuring the reliability and accuracy of the test data. In addition, when the linear movement is changed to a rotational movement, the structure of the reference position detection module for detecting the actual position of the vehicle-mounted transmitting antenna 2 can be simpler, and the detected data can be more accurate. That is, compared with the positioning of the slider in the conventional linear module and the positioning of the rotor position in the motor, the accurate position positioning of the rotor in the motor is more accurate and easier to obtain. In addition, the conventional test method can only perform reciprocating tests or interval one-way tests, while after the vehicle-mounted transmitting antenna 2 is changed to a rotational movement, it can perform long-term high-speed state tests.

[0036] In one embodiment, the radial distance between the cross induction loop unit 1 and the turntable 4 is adjustable. In a test system, the on-vehicle transmitting antenna 2 can be tested with cross induction loop units 1 having multiple different gaps to meet the test requirements under different working conditions.

[0037] In this embodiment, a fixed disk 5 is further included. A plurality of the cross induction loop unit 1 are slidably arranged on the fixed disk 5 along the diameter direction of the fixed disk 5. A locking structure for locking the position of the cross induction loop unit 1 in the sliding stroke is further included. In this way, the position adjustment of the cross induction loop unit 1 is extremely convenient and fast. Moreover, since the cross induction loop unit 1 is in a stationary state during the test, the structure can be ensured to be stable and reliable. Additionally, it is preferably determined that the sliding stroke of the cross induction loop unit 1 is 15 mm, meeting the range requirements of ±5 mm between the cross induction loop unit 1 and the on-vehicle transmitting antenna 2, and simulating the actual use conditions.

[0038] In addition, a gap adjustment mechanism for driving the cross induction loop unit 1 to slide along the diameter direction of the fixed disk 5 is further included. During the test, the gap between the on-vehicle transmitting antenna 2 and one or more cross induction loop units 1 can be changed, thereby simulating the positioning and speed measurement effects under the floating working conditions during the train operation, and further improving the simulation authenticity of the test system. The gap adjustment structure can be a linear drive mechanism such as an electric cylinder, a pneumatic cylinder or a hydraulic cylinder. The body of the linear drive mechanism is arranged on the fixed disk 5, and the output end is connected to the cross induction loop unit 1. At the same time, in this embodiment, the locking structure for locking the position of the cross induction loop unit 1 in the sliding stroke is the self-locking structure after the linear drive mechanism stops.

[0039] The present invention further includes a bracket 6. The fixed disk 5 and the rotary drive member 3 are both fixedly arranged on the bracket 6 to ensure the coaxiality of the turntable 4 and the plurality of cross induction loop units 1, and at the same time improve the integrity of the test system. In addition, a safety protection cover 8 covering the turntable 4 and the fixed disk 5 is further included. The safety protection cover 8 is used to protect the turntable 4, the on-vehicle transmitting antenna 2 and the plurality of cross induction loop units 1. As a key protection device of this test system, it undertakes the risk of high-speed flying of components and fasteners caused by the vibration fatigue of fasteners when the turntable 4 rotates at a high speed, ensuring the personal and equipment safety during the operation of the rotary drive member 3. The safety protection cover 8 is planned to be welded and formed by stainless steel plates, and the thickness of the steel plate is not less than 5 mm, and it has a mechanical interface for maintenance personnel to debug and install the equipment.

[0040] In one embodiment, two or more vehicle-mounted transmitting antennas 2 are arranged in a circular array along the axis of the turntable 4 to ensure symmetric installation of the vehicle-mounted transmitting antennas 2, so that the turntable 4 and the vehicle-mounted transmitting antennas 2 can ensure dynamic balance during the rotation process. In this embodiment, the turntable 4 and the multiple vehicle-mounted transmitting antennas 2 are preferably arranged horizontally to further improve dynamic balance. At the same time, setting two or more can also obtain more test data at the same time, improving the accuracy of the data.

[0041] The present invention further includes a short-circuit fault switch connected to one or more cross induction loop units 1, which can be used for loop short-circuit fault diagnosis tests. Specifically, the short-circuit fault switch preset on the cross induction loop unit 1 is set, a short-circuit fault is generated on the cross induction loop unit 1, and the data of the reference position detection module and the test position detection module are collected and compared with the theoretical fault data for analysis. Figure 7 This is a short-circuit fault simulation test. After the preset short-circuit fault switch is set, the cross induction loop unit 1 at its rear end is bypassed, and when the vehicle-mounted transmitting antenna 2 passes by, the signal envelope of the vehicle-mounted transmitting antenna 2 cannot be detected.

[0042] The present invention further includes an open-circuit fault switch connected to the cross induction loop unit 1, which can be used for loop open-circuit fault diagnosis tests. Specifically, the preset open-circuit fault switch is set, an open-circuit fault is generated on the cross induction loop unit 1, and the data of the reference position detection module and the test position detection module are collected and compared with the theoretical fault data for analysis. Figure 8 This is an open-circuit fault simulation test. After the preset open-circuit fault point is set, there will be no output at all at the rear end loop of the fault point. Due to the antenna effect, there will be a small amplitude induction signal output at the loop before the fault point.

[0043] In one embodiment, the rotation driving member 3 is a permanent magnet synchronous rotary servo motor. The high-speed motor can rotate at a high speed and can control the rotation speed to achieve the position and speed control of the vehicle-mounted transmitting antenna 2. The permanent magnet synchronous rotary servo motor drives the turntable 4 and the vehicle-mounted transmitting antenna 2 to perform relative movement with the multiple cross induction loop units 1 arranged in a circular pattern. By analyzing the data of the reference position detection module and the test position detection module as well as the process variables (rotation speed change, gap between the cross induction loop unit 1 and the vehicle-mounted transmitting antenna 2), the positioning accuracy and dynamic response ability of the system under different speeds and different antenna-loop distance conditions are comprehensively evaluated, so as to judge whether the speed measurement and positioning technology based on the cross induction loop unit 1 meets the index requirements of the speed measurement and positioning system for the medium-speed maglev train traction and operation control system. In addition, it can also test whether the waveform of the cross induction loop signal is distorted and the dynamic response characteristics during the high-speed rotation of the vehicle-mounted transmitting antenna 2 with the permanent magnet synchronous rotary servo motor.

[0044] Among them, the permanent magnet synchronous rotary servo motor can simulate the train's movement to achieve control within the range of 0 - 200 km / h. Preferably, the diameter of the turntable 4 is set to 0.5 m. The vehicle-mounted transmitting antenna 2 is arranged on the circumference of the turntable 4, and the rotational speed of the permanent magnet synchronous rotary servo motor can be adjusted from 0 - 2500 rpm. Compared with the current linear module, electric cylinder, air cylinder or hydraulic cylinder, it can reach a higher speed and simulate the control within the range of 0 - 200 km / h at a lower cost. In this embodiment, the reference position detection module is a resolver 7. A resolver is a precision angle, position, and speed detection device, suitable for all occasions where rotary encoders are used, especially for occasions where rotary encoders cannot work properly under high speed, high vibration, etc. The actual position of the motor rotor is obtained by using the resolver, which can correspond to the position of the vehicle-mounted transmitting antenna 2 on the turntable 4. Preferably, a resolver with a rotation of ±5 arc minutes can meet the requirement of the positioning accuracy of the turntable 4 not less than 0.2°.

[0045] The present invention provides two modes for the static accuracy test and dynamic performance test of the inductive loop, specifically as follows:

[0046] Static accuracy test: The position control can be performed on the output shaft of the permanent magnet synchronous rotary servo motor, and the output shaft can move according to the input position. The resolver 7 feeds back the position signal of the movement. The test position detection module is connected to the cross inductive loop unit 1, and the position of the vehicle-mounted transmitting antenna 2 on the cross inductive loop unit 1 at the same moment can be obtained. By comparing and analyzing the position signal provided by the test position detection module with the position signal of the rotary transformer, a conclusion can be given to judge whether the accuracy of the inductive loop system meets the standard.

[0047] As Figure 5 shown, Figure 5 When the resolver rotates one week around the axis, the output voltage waveform is a sine wave of one period. The angle calculated according to the sine wave is expressed as a periodic linear signal of 0 - 2π. The number of position periods detected by the test position detection module is the number of loop periods, that is, there are 6 sine waves in the cross inductive loop unit 1. The judgment of whether the accuracy of the inductive loop system meets the standard can be realized through zero-crossing comparison.

[0048] Dynamic performance test: Control the permanent magnet synchronous rotary servo motor to rotate at high speed. According to the position signal provided by the test position detection module, judge whether the high-speed signal envelope of the inductive loop is distorted under high-speed conditions, and convert the position error to judge whether the dynamic response characteristic of the inductive loop system meets the standard under high-speed conditions. If the error exceeds 10% of the cross period after conversion, it is considered that the dynamic response characteristic of the inductive loop system does not meet the standard under high-speed conditions.

[0049] As Figure 6As shown, the resolver 7 rotates around the axis for two weeks. Under low-speed conditions, the position curve of the induction loop can meet the requirements. By observing whether the waveform of the loop under high-speed conditions is distorted and calculating the position error, it can be judged whether the dynamic response characteristics of the induction loop system under high-speed conditions meet the standards.

[0050] The present invention also provides an induction loop test method, which uses an induction loop test system and is characterized by including the following steps:

[0051] The rotation driving member 3 drives the turntable 4 and the vehicle-mounted transmitting antenna 2 to rotate;

[0052] The reference position detection module detects the position of the turntable 4;

[0053] The test position detection module detects the position of the vehicle-mounted transmitting antenna 2 on multiple cross induction loop units 1;

[0054] Collect the data of the reference position detection module and the test position detection module and conduct comparison and analysis.

[0055] The content not detailed in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. An inductive loop test system, characterized in that, It includes a rotating device, a vehicle-mounted transmitting antenna (2), and multiple cross inductive loop units (1). The rotating device includes a rotation driving member (3) and a turntable (4) arranged on the output shaft of the rotation driving member (3). The vehicle-mounted transmitting antenna (2) is fixedly arranged on the turntable (4). The multiple cross inductive loop units (1) are arranged in a ring shape and coaxially arranged outside the turntable (4). It further includes a reference position detection module for detecting the actual position of the vehicle-mounted transmitting antenna (2) and a test position detection module for detecting the relative position of the vehicle-mounted transmitting antenna (2) in the cross inductive loop units (1). The radial distance between the cross inductive loop unit (1) and the turntable (4) is adjustable.

2. The induction loop test system according to claim 1, characterized in that, It further includes a fixed disk (5). The multiple cross inductive loop units (1) are slidably arranged on the fixed disk (5) along the diameter direction of the fixed disk (5). It further includes a locking structure for locking the position of the cross inductive loop unit (1) in the sliding stroke.

3. The induction loop test system according to claim 2, characterized in that, It further includes a gap adjusting mechanism for driving the cross inductive loop unit (1) to slide along the diameter direction of the fixed disk (5).

4. The induction loop test system according to claim 2, characterized in that, It further includes a bracket (6). The fixed disk (5) and the rotation driving member (3) are both fixedly arranged on the bracket (6).

5. The inductive loop test system according to claim 1, characterized in that Two or more vehicle-mounted transmitting antennas (2) are arranged in a circular array along the axis of the turntable (4).

6. The inductive loop test system according to any one of claims 1-5, characterized in that, It further includes a short-circuit fault switch connecting one or more cross inductive loop units (1).

7. The induction loop test system according to any one of claims 1-5, characterized in that, It further includes an open-circuit fault switch connecting the cross inductive loop unit (1).

8. The inductive loop test system according to any one of claims 1-5, characterized in that, The rotation driving member (3) is a permanent magnet synchronous rotary servo motor, and the reference position detection module is a resolver (7).

9. An inductive loop test method, using the inductive loop test system according to any one of claims 1-8, characterized in that, It includes the following steps: The rotation driving member (3) drives the turntable (4) and the vehicle-mounted transmitting antenna (2) to rotate; The reference position detection module detects the actual position of the turntable (4); The test position detection module detects the relative position of the vehicle-mounted transmitting antenna (2) on the multiple cross inductive loop units (1); Collect the data of the reference position detection module and the test position detection module for comparison and analysis.

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