Sensor device and method for component vibration testing in hypergravity environment

Abstract

The present invention discloses a sensor device and method for vibration testing of components in a hypergravity environment. An end fixing plate is installed at the front end of a metal shell, a retaining frame is coaxially arranged in a cavity inside the metal shell, an insulating cylinder and a coil are both installed on the periphery of the retaining frame, and a grating measurement unit is movably arranged in the retaining frame. By energizing the coil, a magnetic field is generated around the coil. The magnetic field generated by the coil acts on the magnetic column in the grating measurement unit to offset the hypergravity to which the magnetic column is subjected in a hypergravity environment, and then the vibration acceleration of the component to be tested is measured using the grating measurement unit that is not affected by hypergravity. The present invention can meet the vibration test requirements in centrifugal and non-centrifugal directions under different centrifugal accelerations by controlling the current of the coil. The present invention has the advantages of simple structure, applicability to vibration testing of components in multiple directions under various centrifugal acceleration conditions, and easy operation.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical engineering, and specifically relates to a sensor device and method for component vibration testing in a hypergravity environment. Background Art

[0002] During the operation of an ultra-gravity centrifuge, the vibration state of the centrifuge body is an important factor affecting its safe operation. Abnormal vibration of mechanical equipment will endanger production safety and personnel safety. In addition, the vibration of the basket where the onboard device is installed directly affects the experimental quality of the centrifuge. Therefore, it is necessary to monitor the vibration conditions of the centrifuge basket, rotating arm and other parts to ensure the safe and efficient conduct of the experiment. With the development of centrifuges to higher centrifugal accelerations, the requirements for vibration sensors are also increasing. Most sensors currently on the market are difficult to meet the needs of vibration testing under high centrifugal conditions, and there are often problems of easy failure and measurement inaccuracy under centrifugal acceleration conditions. Therefore, the use of suitable vibration sensors to monitor whether the vibration of the equipment is within the normal range will provide an important reference basis for staff to judge the working status of the equipment. The existing technology lacks a component vibration test sensor that can be applied to high centrifugal acceleration conditions. Summary of the Invention

[0003] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide a sensor device and method for vibration testing of components in a hypergravity environment, so as to solve the problem that the vibration state of components is difficult to test under high centrifugal acceleration conditions, and to provide a testing method for monitoring the vibration state of equipment. The device of the present invention can be used for vibration testing of components in multiple directions in a hypergravity environment.

[0004] The technical solutions adopted in the present invention are as follows:

[0005] 1. A sensor device for component vibration testing in a hypergravity environment:

[0006] The device comprises a metal shell, a holder, an insulating cylinder, a coil, a grating measurement unit and an end fixing plate; the metal shell is a hollow cylindrical structure with an open front end and a closed rear end; the outer wall of the metal shell is fixedly connected to the component to be measured; the end fixing plate is fixedly installed at the front end of the metal shell; the holder is coaxially arranged in the cavity inside the metal shell; the insulating cylinder and the coil are both installed on the outer circumference of the holder; the grating measurement unit is movably arranged in the holder; a magnetic field is generated around the coil by energizing the coil; the magnetic field generated by the coil acts on the magnetic column in the grating measurement unit to offset the hypergravity exerted on the magnetic column in a hypergravity environment, and then the vibration acceleration of the component to be measured is measured using the grating measurement unit that is not disturbed by hypergravity.

[0007] The retaining frame includes an outer ring, an inner ring, a limiting cover and a coil partition; the outer ring and the inner ring both adopt a hollow cylindrical structure with openings at the front and rear ends, the inner ring is coaxially arranged in the cavity inside the outer ring, and the outer wall of the inner ring and the inner wall of the outer ring do not contact each other, and the cavity surrounded by the outer wall of the inner ring and the inner wall of the outer ring is used as the retaining cavity, the coil partition is located in the middle of the retaining cavity and divides the retaining cavity evenly into two coil cavities, each coil cavity is installed with an annular insulating cylinder and an annular coil, the insulating cylinder and the coil are coaxial with the outer ring, and the insulating cylinder is fixedly connected between the coil and the inner wall of the outer ring, two limiting covers are fixedly installed at the front and rear ends of the outer ring for limiting the grating measurement unit; the outer ring of the retaining frame is fixedly connected to the inner wall of the metal shell.

[0008] The grating measurement unit includes a sleeve, a magnetic column, and a displacement sensor; the magnetic column is arranged in the cavity in the middle of the inner ring so as to be movable forward and backward along the axial direction of the retaining frame; the sleeve is fixedly mounted on the outer periphery of the magnetic column, and a gap is formed between the sleeve and the outer wall of the inner ring; the limit cover is used to limit the forward and backward movement of the sleeve and the magnetic column;

[0009] The coil surrounding the magnetic column is connected to an external power supply. When the coil is energized, a magnetic field is formed to act on the magnetic column. The magnetic field force generated by the coil is used to offset the hypergravity exerted on the magnetic column and the sleeve in a hypergravity environment. The magnetic column drives the sleeve to vibrate synchronously. The displacement sensor is installed on the end fixing plate to measure the axial displacement of the magnetic column under vibration, and then measure the vibration acceleration of the component to be tested in the axial direction of the sensor device.

[0010] A displacement sensor is installed on the end fixing plate. The displacement sensor is arranged along the axial direction of the retaining frame, and the displacement sensor is located on the extension line of the central axis of the magnetic column.

[0011] 2. A component vibration testing method in a hypergravity environment, comprising the following steps:

[0012] Step S1: First, install the sensor device on the component to be tested of the centrifuge;

[0013] Step S2: The centrifuge is then started, and the coil is connected to an external power source. When the coil is energized, a magnetic field is formed around the magnetic column and acts on the magnetic column. During the centrifugal acceleration of the centrifuge, the magnitude and direction of the magnetic field generated by the coil are controlled in real time so that the magnetic field formed by the coil offsets the hypergravity exerted on the magnetic column in the hypergravity environment. When the centrifugal acceleration of the centrifuge reaches a preset centrifugal acceleration value Ng and lasts for a preset time, the magnetic field generated by the coil is kept stable.

[0014] Step S3: During the vibration test, the magnetic column and the sleeve vibrate synchronously with the vibration of the component to be tested, and then the displacement of the magnetic column is measured by the displacement sensor to obtain the vibration acceleration of the component to be tested.

[0015] In step S3, the displacement of the magnetic column is measured by using a displacement sensor to obtain the vibration acceleration of the component to be measured. The specific method is:

[0016] The displacement sensor is installed on the end fixing plate and is located on the extension line of the central axis of the magnetic column. When the magnetic column drives the sleeve to vibrate, the displacement sensor measures the displacement of the magnetic column in its own axial direction, and then obtains the vibration acceleration of the component to be tested in the axial direction of the sensor device.

[0017] In step S2, when the centrifugal acceleration of the centrifuge reaches the preset centrifugal acceleration value Ng and stabilizes, the magnetic field force generated by the coil is equivalent to the resultant hypergravity force exerted on the magnetic column and the grating scale in the hypergravity environment.

[0018] As the centrifugal acceleration of the component under test increases, controlling the operating current of the two coils generates a magnetic field that counteracts the gravity acting in the direction of the centrifugal force acting on the NS magnetic column. Once stable centrifugal acceleration is achieved, the NS magnetic column vibrates within the retaining frame under the vibration of the component, and the grating scale moves with it. The grating reader collects the displacement signal of the grating scale to obtain the movement of the NS magnetic column within the retaining frame. Ultimately, through calibration, the vibration acceleration of the component under test connected to the sensor device is obtained. Furthermore, by adding a displacement sensor structure in the axial direction to monitor the movement of the NS magnetic column, component vibration data can also be obtained.

[0019] The present invention can meet the vibration test requirements in centrifugal and non-centrifugal directions under different centrifugal accelerations through coil current control, and can measure the vibration of components under centrifugal acceleration conditions using a grating displacement sensor.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention sets a coil and uses the magnetic field generated by the coil to offset the gravity in the direction of the centrifugal force acting on the magnetic column, so as to avoid the problem of sensor device failure and measurement inaccuracy during the operation of the ultragravity centrifuge. It can accurately measure whether the vibration of the vibration sensor monitoring equipment is within the normal range.

[0022] 2. The present invention has the advantages of simple structure, easy processing and manufacturing, low production cost and convenient operation. It adopts the principle of electromagnetic induction and can meet the vibration sensor's vibration testing needs for components in different centrifugal hypergravity environments through active control. At the same time, it can be applied to vibration testing of components in different directions under hypergravity environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the vibration sensor device of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the cage of the present invention;

[0025] In the figure: 1-metal shell; 2-holding frame; 2-1 outer ring; 2-2 inner ring; 3, insulating cylinder; 5-coil; 7-limiting cover; 9-sleeve; 10-magnetic column; 11-end fixing plate; 12-displacement sensor. DETAILED DESCRIPTION

[0026] The following exemplary embodiments are described in detail, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numbers in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0027] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0028] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0029] like Figure 1As shown, the device includes a metal shell 1, a holder 2, an insulating cylinder 3, a coil 5, a grating measurement unit and an end fixing plate 11; the metal shell 1 is a hollow cylindrical structure with an open front end and a closed rear end, the outer wall of the metal shell 1 is fixedly connected to the component to be measured, the end fixing plate 11 is fixedly installed at the front end of the metal shell 1, the holder 2 is coaxially arranged in the cavity inside the metal shell 1, the insulating cylinder 3 and the coil 5 are both installed on the outer periphery of the holder 2, and the grating measurement unit is movably arranged in the holder 2. By energizing the coil 5, a magnetic field is generated around the coil 5, and the magnetic field generated by the coil 5 acts on the magnetic column 10 in the grating measurement unit to offset the hypergravity exerted on the magnetic column 10 in the hypergravity environment, and then the vibration acceleration of the component to be measured is accurately measured using the grating measurement unit that is not disturbed by hypergravity.

[0030] By controlling the working current of the coil 5 , a magnetic field can be generated to resist the hypergravity exerted on the NS magnetic column 10 , thereby keeping the coil 5 stable during stable centrifugal acceleration, thereby allowing the magnetic column 10 to eliminate the interference of hypergravity.

[0031] like Figure 2 As shown, the retaining frame 2 includes an outer ring 2-1, an inner ring 2-2, a limiting cover plate 7 and a coil partition; the outer ring 2-1 and the inner ring 2-2 both adopt a hollow cylindrical structure with openings at the front and rear ends, the inner ring 2-2 is coaxially arranged in the cavity inside the outer ring 2-1, and the outer wall of the inner ring 2-2 and the inner wall of the outer ring 2-1 do not contact each other, and the cavity surrounded by the outer wall of the inner ring 2-2 and the inner wall of the outer ring 2-1 is used as the retaining cavity, the coil partition is located in the middle of the retaining cavity and divides the retaining cavity evenly into two coil cavities, and the coil partition The inner and outer walls of the plate are fixedly connected to the outer wall of the inner ring 2-2 and the inner wall of the outer ring 2-1 respectively. An annular insulating cylinder 3 and an annular coil 5 are installed in each coil cavity. The insulating cylinder 3 and the coil 5 are coaxial with the outer ring 2-1, and the insulating cylinder 3 is fixedly connected between the coil 5 and the inner wall of the outer ring 2-1. Two limit cover plates 7 are fixedly installed at the front and rear ends of the outer ring 2-1 to limit the grating measurement unit; the outer ring 2-1 of the retaining frame 2 is fixedly connected to the inner wall of the metal shell.

[0032] The grating measurement unit includes a sleeve 9, a magnetic column 10, and a displacement sensor 12. The magnetic column 10 is arranged in the cavity in the middle of the inner ring 2-2 so as to be movable forward and backward along the axial direction of the retaining frame 2. The sleeve 9 is fixedly mounted on the outer periphery of the magnetic column 10, and a gap exists between the sleeve 9 and the outer wall of the inner ring 2-2. The aperture of the opening in the middle of the limit cover 7 is smaller than the diameter of the sleeve 9 to prevent the sleeve 9 and the magnetic column 10 from escaping from the retaining frame 2. The limit cover 7 is used to limit the travel of the sleeve 9 and the magnetic column 10.

[0033] The coils 5 surrounding the magnetic column 10 are connected to an external power supply. When the coils 5 are energized, a magnetic field is formed to act on the magnetic column 10. The combined magnetic field force generated by the two coils 5 is used to offset the hypergravity exerted on the magnetic column 10 and the sleeve 9 in a hypergravity environment. The magnetic column 10 drives the sleeve 9 to vibrate synchronously. The displacement sensor 12 is installed on the end fixing plate 11 to measure the axial displacement of the magnetic column 10 under vibration, and then measure the vibration acceleration of the component to be tested in the axial direction of the sensor device.

[0034] like Figure 1 As shown, when testing vibration acceleration in the direction of centrifugal acceleration, the operating current of coil 5 can first be controlled to generate a magnetic field to resist the supergravity exerted on NS magnetic column 10. After the moving component reaches a stable centrifugal acceleration, coil 5 is kept stable at the stable centrifugal acceleration. When the component vibrates, NS magnetic column 10 vibrates within retaining frame 2, and sleeve 9 moves with NS magnetic column 10. Displacement sensor 12 collects the displacement signal of sleeve 9 to obtain the movement of NS magnetic column 10 within retaining frame 2. Ultimately, through calibration, the vibration acceleration of the component measured by the sensor device is obtained.

[0035] A displacement sensor 12 is mounted on the end fixing plate 11 . The displacement sensor 12 is arranged along the axial direction of the retaining frame 2 , and is located on the extension line of the central axis of the magnetic column 10 .

[0036] A displacement sensor 12 is mounted on the end fixing plate 11. The relative distance between the NS magnetic column 10 and the end fixing plate 11 is measured to determine the motion state of the NS magnetic column 10 within the retaining frame 2. Ultimately, calibration is performed to determine the component's vibration acceleration as measured by the sensor device. When testing component vibration in a non-centrifugal acceleration direction, the same current is passed through the coil 5 to maintain the initial neutral position of the NS magnetic column 10.

[0037] An embodiment of the present invention includes the following steps:

[0038] Step S1: First, the sensor device is installed on the part to be tested of the centrifuge; the part to be tested includes the basket, rotating arm and other parts of the centrifuge.

[0039] Step S2, then the centrifuge is started, and the coil 5 is connected to an external power supply at the same time. After the coil 5 is energized, a magnetic field is formed around the magnetic column 10 and acts on the magnetic column 10. During the centrifugal acceleration of the centrifuge, the size and direction of the magnetic field generated by the coil 5 are controlled in real time, so that the magnetic field formed by the coil 5 offsets the hypergravity exerted on the magnetic column 10 in the hypergravity environment. When the centrifugal acceleration of the centrifuge reaches a preset centrifugal acceleration value Ng and lasts for a preset time, the magnetic field generated by the coil 5 is kept stable, that is, the current external to the coil 5 is constant; wherein g represents the center of gravity acceleration, and N represents the acceleration multiple set in the hypergravity centrifugal test.

[0040] Step S3 : During the vibration test, the magnetic column 10 and the sleeve 9 vibrate synchronously with the vibration of the component to be tested. Then, the displacement of the magnetic column 10 is measured by the displacement sensor 12 to obtain the vibration acceleration of the component to be tested.

[0041] In step S3, the displacement sensor 12 is used to measure the displacement of the magnetic column 10, and the vibration acceleration of the component to be measured is obtained in the following manner:

[0042] The displacement sensor 12 is mounted on the end fixing plate 11 and is located on the extension line of the central axis of the magnetic column 10. When the magnetic column 10 drives the sleeve 9 to vibrate, the displacement sensor 12 measures the displacement of the magnetic column 10 in its own axial direction, and then obtains the vibration acceleration of the component to be tested in the axial direction of the sensor device.

[0043] In step S2, when the centrifugal acceleration of the centrifuge reaches the preset centrifugal acceleration value Ng and stabilizes, the magnetic field force generated by the coil 5 is equivalent to the hypergravity force exerted on the magnetic column 10 and the sleeve 9 in the hypergravity environment.

[0044] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0045] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A sensor device for component vibration testing in a hypergravity environment, characterized by: The invention comprises a metal shell (1), a holder (2), an insulating cylinder (3), a coil (5), a grating measurement unit and an end fixing plate (11); the metal shell (1) is a hollow cylindrical structure with an open front end and a closed rear end, the outer wall of the metal shell (1) is fixedly connected to the component to be measured, the end fixing plate (11) is fixedly installed at the front end of the metal shell (1), the holder (2) is coaxially arranged in the cavity inside the metal shell (1), the insulating cylinder (3) and the coil (5) are both installed on the outer periphery of the holder (2), the grating measurement unit is movably arranged in the holder (2), and a magnetic field is generated around the coil (5) by energizing the coil (5), and the magnetic field generated by the coil (5) acts on the magnetic column (10) in the grating measurement unit to offset the hypergravity exerted on the magnetic column (10) in the hypergravity environment, thereby using the grating measurement unit that is not disturbed by the hypergravity to measure the vibration acceleration of the component to be measured; The retaining frame (2) comprises an outer ring (2-1), an inner ring (2-2), a limiting cover plate (7) and a coil partition; The outer ring (2-1) and the inner ring (2-2) both adopt a hollow cylindrical structure with openings at the front and rear ends. The inner ring (2-2) is coaxially arranged in the cavity inside the outer ring (2-1), and the outer wall of the inner ring (2-2) and the inner wall of the outer ring (2-1) do not contact each other. The cavity surrounded by the outer wall of the inner ring (2-2) and the inner wall of the outer ring (2-1) is used as a holding cavity. The coil partition is located in the middle of the holding cavity and evenly divides the holding cavity into two coil cavities. Each An annular insulating cylinder (3) and an annular coil (5) are installed in the coil cavity. The insulating cylinder (3) and the coil (5) are coaxial with the outer ring (2-1), and the insulating cylinder (3) is fixedly connected between the coil (5) and the inner side wall of the outer ring (2-1). Two limiting cover plates (7) are fixedly installed at the front and rear ends of the outer ring (2-1) for limiting the grating measurement unit. The outer ring (2-1) of the retaining frame (2) is fixedly connected to the inner side wall of the metal shell. The grating measurement unit comprises a sleeve (9), a magnetic column (10) and a displacement sensor (12); the magnetic column (10) is arranged in a cavity in the middle of the inner ring (2-2) so as to be movable forward and backward along the axial direction of the retaining frame (2); the sleeve (9) is fixedly sleeved on the outer periphery of the magnetic column (10), and a gap exists between the sleeve (9) and the outer side wall of the inner ring (2-2); the limit cover (7) is used to limit the travel of the sleeve (9) and the magnetic column (10) in moving forward and backward.

2. The sensor device for component vibration testing in a hypergravity environment according to claim 1, characterized in that: The coil (5) around the magnetic column (10) is connected to an external power supply. When the coil (5) is energized, a magnetic field is formed to act on the magnetic column (10). The magnetic field force generated by the coil (5) is used to offset the hypergravity exerted on the magnetic column (10) and the sleeve (9) in a hypergravity environment. The magnetic column (10) drives the sleeve (9) to vibrate synchronously. The displacement sensor (12) is installed on the end fixing plate (11) and is used to measure the axial displacement of the magnetic column (10) under vibration, and further measure the vibration acceleration of the component to be measured in the axial direction of the sensor device.

3. The sensor device for component vibration testing in a hypergravity environment according to claim 1, characterized in that: A displacement sensor (12) is installed on the end fixing plate (11), the displacement sensor (12) is arranged along the axial direction of the retaining frame (2), and the displacement sensor (12) is located on the extension line of the central axis of the magnetic column (10).

4. A component vibration testing method in a hypergravity environment applied to the device according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step S1: First, install the sensor device on the component to be tested of the centrifuge; Step S2, then the centrifuge is started, and the coil (5) is connected to an external power supply at the same time. After the coil (5) is energized, a magnetic field is formed around the magnetic column (10) and acts on the magnetic column (10). During the centrifugal acceleration of the centrifuge, the size and direction of the magnetic field generated by the coil (5) are controlled in real time, so that the magnetic field formed by the coil (5) offsets the hypergravity exerted on the magnetic column (10) in the hypergravity environment. When the centrifugal acceleration of the centrifuge reaches a preset centrifugal acceleration value Ng and lasts for a preset time, the magnetic field generated by the coil (5) is kept stable. Step S3: During the vibration test, the magnetic column (10) and the sleeve (9) vibrate synchronously with the vibration of the component to be tested, and then the displacement of the magnetic column (10) is measured using the displacement sensor (12), thereby obtaining the vibration acceleration of the component to be tested.

5. The component vibration testing method in a hypergravity environment according to claim 4, characterized in that: In step S3, the displacement sensor (12) is used to measure the displacement of the magnetic column (10), thereby obtaining the vibration acceleration of the component to be measured. The specific method is: The displacement sensor (12) is mounted on the end fixing plate (11) and is located on the extension line of the central axis of the magnetic column (10). When the magnetic column (10) drives the sleeve (9) to vibrate, the displacement sensor (12) measures the displacement of the magnetic column (10) in its own axial direction, thereby obtaining the vibration acceleration of the component to be measured in the axial direction of the sensor device.

6. The component vibration testing method in a hypergravity environment according to claim 4, characterized in that: In step S2, when the centrifugal acceleration of the centrifuge reaches a preset centrifugal acceleration value Ng and stabilizes, the magnitude of the magnetic field force generated by the coil (5) is equivalent to the combined hypergravity force exerted on the magnetic column (10) and the sleeve (9) in a hypergravity environment.

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