Dynamic zero-point adjustment method for suspension-supported pendulum accelerometer

Abstract

This paper presents a method for dynamic zero-point adjustment of a suspension-supported pendulum accelerometer. The method optimizes the adjustment process and calculates the dynamic zero-point error test value of the accelerometer. Combined with the given quantitative adjustment parameters, it enables the one-time adjustment of suspension-supported pendulum accelerometers with out-of-tolerance dynamic zero-point, improving the pass rate. The adjustment method is simple, and the parameter correction is precise, ensuring that the corrected dynamic zero-point difference of the suspension-supported pendulum accelerometer is within a reasonable range. Without altering the original structure, the dynamic zero-point of the suspension-supported pendulum accelerometer is compensated by adding inductance. This method is particularly suitable for dynamic zero-point adjustment of similar accelerometers that are not easily modified, and has significant promotional value and reference value.

Description

Technical Field

[0001] This invention belongs to the technical field of precision inertial device manufacturing, specifically relating to a method for dynamic zero-position adjustment of a suspension wire-supported pendulum accelerometer. Background Technology

[0002] Accelerometers are one of the main components of inertial navigation systems, widely used in aerospace, shipbuilding, and other fields. A suspension-wire accelerometer consists of components such as a torque converter assembly, a sensor assembly, a servo circuit, and a base assembly. The torque converter assembly comprises a torque converter coil winding and two permanent magnets. The torque converter coil winding is wound on a pendulum frame. Its function is to generate an electromagnetic torque in the magnetic field through current during accelerometer operation to balance the inertial torque. The sensor consists of an eddy current plate, a pair of sensor coils, and a coil frame. The eddy current plate is fixed to the pendulum frame, and the sensor coils are mounted on the coil frame, which is fixed to the base. The eddy current plate is located in the air gap between the two sensor coils. Its function is to sense acceleration signals and generate electrical signals. The servo circuit assembly demodulates and amplifies the weak signal output from the sensor, then outputs it to the torque converter coil to form an electromagnetic force feedback closed loop.

[0003] During horizontal vibration, when the accelerometer's swing axis is aligned with the vibration direction, the inertial force and vibration impact force act together on the eddy current plates of the sensor coil. The accelerometer's output changes during vibration, becoming larger or smaller than its static output. This difference is called the dynamic zero point. The dynamic zero point refers to the change in the accelerometer's output value during vibration (dynamic condition) relative to its output value before vibration (static condition), characterizing the accelerometer's output accuracy (stability) under dynamic conditions. Currently, in the manufacturing of suspension-supported pendulum accelerometers, all components are glued and welded during assembly, fixing the structure. This makes dynamic zero point correction and compensation impossible, resulting in a low dynamic zero point tolerance rate and the inability to rework. Therefore, improvements are necessary to address these issues. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a dynamic zero-point adjustment method for a suspension-supported pendulum accelerometer. This method optimizes the adjustment process, calculates and determines the dynamic zero-point error test value of the suspension-supported pendulum accelerometer, and, combined with the given quantitative adjustment parameters, adjusts a suspension-supported pendulum accelerometer with out-of-tolerance dynamic zero point to pass the test in one go, thereby improving the pass rate. The adjustment method is simple, the parameter correction is accurate, and it ensures that the dynamic zero-point difference of the corrected suspension-supported pendulum accelerometer is within a reasonable range.

[0005] The technical solution adopted in this invention is a dynamic zero-position adjustment method for a suspension-supported pendulum accelerometer, comprising the following steps:

[0006] 1) Install the pendulum accelerometer with suspension wire support on the vibration fixture on the upper surface of the horizontal vibration table, and make the swing axis direction of the pendulum accelerometer with suspension wire support consistent with the vibration direction of the horizontal vibration table.

[0007] 2) Utilize a high-precision data acquisition system to measure the zero-point output voltage U of the suspension-supported pendulum accelerometer under static conditions. 振前 Collect data;

[0008] 3) Start the horizontal vibration table to make it swing the suspension-supported pendulum accelerometer, and use a high-precision data acquisition system to measure the zero-point output voltage U of the suspension-supported pendulum accelerometer under vibration conditions. 振中 Collect data;

[0009] 4) Design and calculate the output voltage changes of the suspension-supported pendulum accelerometer before and during vibration, and the output voltage U under static 1g state. g The ratio is the dynamic zero-position error test value K. D The dynamic zero-point error test value K of the suspension-supported pendulum accelerometer is... D The calculation formula is:

[0010] K D =(U 振中 -U 振前 ) / U g ×1000

[0011] Among them, U 振中 U is the zero-point output voltage of the pendulum accelerometer supported by a suspension wire under the vibration state of a horizontal vibration table. 振前 The zero-point output voltage of the pendulum accelerometer supported by a suspension wire is given by the voltage at rest on the horizontal vibration table. 1g is a gravitational acceleration, where 1g = 1000mg.

[0012] 5) Based on the zero-point error K of the suspension-supported pendulum accelerometer D Determine whether the dynamic zero point of the suspension-supported pendulum accelerometer needs adjustment, i.e., when |K D When |K ≤ 2mg, the zero-point error of the suspension-supported pendulum accelerometer does not need adjustment; when |K D When the value is >2mg, the inductance is adjusted by adding inductance to the upper coil (1) and lower coil of the sensor of the pendulum accelerometer supported by the suspension wire.

[0013] In step 5) above, if the zero-point error K of the suspension-supported pendulum accelerometer... D If the test value is positive, the eddy current plate is close to the lower coil of the sensor during the zero-position vibration of the suspension-supported pendulum accelerometer. At this time, the eddy current effect generated by the lower coil of the sensor is enhanced. The dynamic zero-position value of the suspension-supported pendulum accelerometer is corrected by adding an inductance between the terminals P1 and P2 at the connection position between the upper coil of the sensor and the servo circuit.

[0014] In step 5) above, if the zero-point error K of the suspension-supported pendulum accelerometer... D If the test value is negative, the position of the eddy current plate relative to the upper coil of the sensor during the zero-position vibration of the suspension-supported pendulum accelerometer is as follows: At this time, the eddy current effect generated by the upper coil of the sensor is enhanced. The dynamic zero-position value of the suspension-supported pendulum accelerometer is corrected by adding an inductance between the terminals P1 and P3 at the connection position between the lower coil of the sensor and the servo circuit.

[0015] Furthermore, the dynamic zero-point error test value K of the suspension-supported pendulum accelerometer D The compensation relationship between the inductor and the compensation inductor is that each 1 mg corresponds to a compensation inductance value of 0.2 μH.

[0016] Furthermore, the suspension-supported pendulum accelerometer includes an upper sensor coil, a lower sensor coil, an eddy current plate located between the upper and lower sensor coils, and a servo circuit. Two adapter plates G2 connected to both ends of the upper sensor coil are connected to terminals P1 and P3 of the servo circuit via wires, respectively. Two adapter plates G1 connected to both ends of the lower sensor coil are connected to terminals P1 and P2 of the servo circuit via wires, respectively.

[0017] Advantages of this invention compared to existing technologies:

[0018] 1. This technical solution optimizes the debugging process and calculates and determines the dynamic zero-point error test value of the suspension-supported pendulum accelerometer. Combined with the given quantitative debugging parameters, the suspension-supported pendulum accelerometer with dynamic zero-point error can be adjusted to pass the test in one go, thereby improving the pass rate.

[0019] 2. This technical solution compensates for the dynamic zero position of the suspension wire-supported pendulum accelerometer by adding an inductor without changing the original structure. It is particularly suitable for the dynamic zero position adjustment of similar accelerometers that are not easily changed, and has great significance for promotion and reference value.

[0020] 3. The debugging method of this technical solution is simple and the parameter correction is accurate, ensuring that the dynamic zero-point difference of the pendulum accelerometer with suspension support after correction is within a reasonable range. Attached Figure Description

[0021] Figure 1 This is a simplified structural diagram of a pendulum accelerometer supported by a suspension wire.

[0022] Figure 2 A simplified diagram of the structure of the present invention, which adds an inductor between terminals P1 and P2 at the connection position of the coil and the servo circuit on the sensor.

[0023] Figure 3This is a simplified diagram of the structure of the present invention, which adds an inductor between terminals P1 and P3 at the connection position between the lower coil of the sensor and the servo circuit. Detailed Implementation

[0024] The following will be based on embodiments of the present invention. Figure 1-3 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] The method for dynamic zero-point calibration of a suspension-supported pendulum accelerometer includes the following steps:

[0028] 1) Install the pendulum accelerometer with suspension wire support on the vibration fixture on the upper surface of the horizontal vibration table, and make the swing axis direction of the pendulum accelerometer with suspension wire support consistent with the vibration direction of the horizontal vibration table; wherein, the vibration fixture is fixed to the horizontal vibration table by a pressure plate, and the pendulum accelerometer with suspension wire support is fixed to the vibration fixture by bolts;

[0029] 2) Utilize a high-precision data acquisition system to measure the zero-point output voltage U of the suspension-supported pendulum accelerometer under static conditions. 振前 Collect data;

[0030] 3) Start the horizontal vibration table to make it swing the suspension-supported pendulum accelerometer, and use a high-precision data acquisition system to measure the zero-point output voltage U of the suspension-supported pendulum accelerometer under vibration conditions. 振中 Collect data;

[0031] 4) Design and calculate the output voltage changes of the suspension-supported pendulum accelerometer before and during vibration, and the output voltage U under static 1g state. g The ratio is the dynamic zero-position error test value K. D The dynamic zero-point error test value K of the suspension-supported pendulum accelerometer is... D The calculation formula is:

[0032] K D =(U 振中 -U 振前 ) / U g ×1000

[0033] Among them, U 振中 U is the zero-point output voltage of the pendulum accelerometer supported by a suspension wire under the vibration state of a horizontal vibration table. 振前 The zero-point output voltage of the pendulum accelerometer supported by a suspension wire is given by the voltage at rest on the horizontal vibration table. 1g is a gravitational acceleration, where 1g = 1000mg.

[0034] 5) Based on the zero-point error K of the suspension-supported pendulum accelerometer D Determine whether the dynamic zero point of the suspension-supported pendulum accelerometer needs adjustment, i.e., when |K D When |K ≤ 2mg, the zero-point error of the suspension-supported pendulum accelerometer does not need adjustment; when |K D When |>2mg, adjustment is achieved by adding inductance to the upper coil 1 and lower coil 3 of the sensor of the suspension-supported pendulum accelerometer; specifically, if the zero-point error K of the suspension-supported pendulum accelerometer is... D If the test value is positive, then during the zero-position vibration of the suspension-supported pendulum accelerometer, the eddy current plate 2 is close to the position of the lower coil 3 of the sensor. At this time, the eddy current effect generated by the lower coil 3 of the sensor is enhanced. The dynamic zero-position value of the suspension-supported pendulum accelerometer is corrected by adding an inductance between the terminals P1 and P2 at the connection position between the upper coil 1 of the sensor and the servo circuit 4. Specifically, if the zero-position error K of the suspension-supported pendulum accelerometer is... D If the test value is negative, the position of the eddy current plate 2 relative to the upper coil 1 of the sensor during the zero-position vibration of the suspension-supported pendulum accelerometer will be affected. At this time, the eddy current effect generated by the upper coil 1 of the sensor will be enhanced. The dynamic zero-position value of the suspension-supported pendulum accelerometer will be corrected by adding an inductance between the terminals P1 and P3 at the connection position of the lower coil 3 of the sensor and the servo circuit 4.

[0035] Among them, the dynamic zero-position error test value K DThe relationship with the correction compensation inductance value is as follows: the dynamic zero-point error test value K of the suspension-supported pendulum accelerometer D The compensation relationship between the inductor and the compensation inductor is that each 1 mg corresponds to a compensation inductance value of 0.2 μH.

[0036] The specific structure of the suspension wire supported pendulum accelerometer is as follows: The suspension wire supported pendulum accelerometer includes an upper sensor coil 1, a lower sensor coil 3, an eddy current plate 2 located between the upper sensor coil 1 and the lower sensor coil 3, and a servo circuit 4. Two adapter plates G2 connected to both ends of the upper sensor coil 1 are connected to the terminals P1 and P3 of the servo circuit 4 respectively via wires. Two adapter plates G1 connected to both ends of the lower sensor coil 3 are connected to the terminals P1 and P2 of the servo circuit 4 respectively via wires.

[0037] like Figure 2-3 As shown in the example, the specific test case illustrates the following:

[0038] Dynamic zero-point error test value K of suspension-supported pendulum accelerometer D If the value is 3mg and needs to be adjusted to 1mg, then the dynamic zero-point error test value K will be... D If the result is positive, a 2mg deviation adjustment is needed. Combined with a 1mg adjustment change corresponding to a 0.2μH inductance compensation, an inductance L1 = 0.4μH needs to be added between terminals P1 and P2 at the connection point between coil 1 and servo circuit 4 on the sensor. Conversely, if the dynamic zero-point error test value K of the suspension-supported pendulum accelerometer is... D The value is -3mg, which needs to be adjusted to 1mg. The adjustment will result in an out-of-tolerance change of 4mg. Combined with the compensation of the 0.2μH inductance value corresponding to the 1mg adjustment change, an inductance L2 = 0.8μH needs to be added between the terminals P1 and P3 at the connection position of the lower coil 3 of the sensor and the servo circuit 4.

[0039] This technical solution optimizes the debugging process and calculates and determines the dynamic zero-point error test value of the suspension-supported pendulum accelerometer. Combined with the given quantitative debugging parameters, the suspension-supported pendulum accelerometer with dynamic zero-point error can be adjusted to pass the test in one go, improving the pass rate. The debugging method is simple, the parameter correction is accurate, and it ensures that the dynamic zero-point difference of the corrected suspension-supported pendulum accelerometer is within a reasonable range.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for dynamic zero-point adjustment of a suspension-supported pendulum accelerometer, characterized in that... Includes the following steps: 1) Install the pendulum accelerometer with suspension wire support on the vibration fixture on the upper surface of the horizontal vibration table, and make the swing axis direction of the pendulum accelerometer with suspension wire support consistent with the vibration direction of the horizontal vibration table; 2) Utilize a high-precision data acquisition system to measure the zero-point output voltage of the suspension-supported pendulum accelerometer under static conditions. Collect data; 3) Start the horizontal vibration table to make it swing the suspension-supported pendulum accelerometer, and use a high-precision data acquisition system to measure the zero-point output voltage of the suspension-supported pendulum accelerometer under vibration conditions. Collect data; 4) Design calculation of the output voltage changes of the suspension-supported pendulum accelerometer before and during vibration, and the static voltage changes. Output voltage under certain conditions The ratio is the dynamic zero-position error test value. The dynamic zero-point error test value of the suspension-supported pendulum accelerometer The calculation formula is: in, This refers to the zero-point output voltage of the pendulum accelerometer supported by a suspension wire under the vibration state of a horizontal vibration table. The zero-point output voltage of the pendulum accelerometer supported by a suspension wire in a static state on a horizontal vibration table is 1. Let be a gravitational acceleration, where 1 =1000 ; 5) Based on the zero-point error of the suspension-supported pendulum accelerometer Determine whether the dynamic zero point of the suspension-supported pendulum accelerometer needs adjustment, i.e., when... When the zero-point error of the suspension-supported pendulum accelerometer does not need to be adjusted; when At that time, the inductance is added to the upper coil (1) and lower coil (3) of the sensor of the suspension wire-supported pendulum accelerometer for adjustment; If the zero-point error of the pendulum accelerometer supported by the suspension wire is... If the test value is positive, the eddy current plate (2) is close to the lower coil (3) of the sensor during the zero-position vibration of the suspension wire support pendulum accelerometer. At this time, the eddy current effect generated by the lower coil (3) of the sensor is enhanced. The dynamic zero position value of the suspension wire support pendulum accelerometer is corrected by adding an inductance between the terminal P1 and terminal P2 at the connection position of the upper coil (1) of the sensor and the servo circuit (4). If the zero-point error of the pendulum accelerometer supported by the suspension wire is... If the test value is negative, the eddy current plate (2) is located near the upper coil (1) of the sensor during the zero-position vibration of the suspension wire support pendulum accelerometer. At this time, the eddy current effect generated by the upper coil (1) of the sensor is enhanced. The dynamic zero-position value of the suspension wire support pendulum accelerometer is corrected by adding an inductance between the terminal P1 and terminal P3 at the connection position of the lower coil (3) of the sensor and the servo circuit (4). The dynamic zero-position error test value of the suspension-supported pendulum accelerometer The compensation relationship between the inductor and the compensation inductor is 0.2 per 1 mg. Inductance compensation.

2. The method for dynamic zero-position adjustment of a suspension-supported pendulum accelerometer according to claim 1, characterized in that: The suspension wire-supported pendulum accelerometer includes an upper sensor coil (1), a lower sensor coil (3), an eddy current plate (2) located between the upper sensor coil (1) and the lower sensor coil (3), and a servo circuit (4). Two adapter plates G2 connected to both ends of the upper sensor coil (1) are connected to the terminals P1 and P3 of the servo circuit (4) respectively via wires. Two adapter plates G1 connected to both ends of the lower sensor coil (3) are connected to the terminals P1 and P2 of the servo circuit (4) respectively via wires.

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