A prism installation error debugging method

Abstract

The application discloses a prism installation error debugging method, which comprises the following steps: testing the height size and static stiffness of a shock absorber, selecting a group of shock absorbers meeting the requirements, installing the shock absorbers on a platform of a strapdown inertial navigation system, calibrating the prism installation error of the strapdown inertial navigation system, if the shock absorbers do not meet the requirements, selecting another group of shock absorbers to replace the shock absorbers, and then calibrating the prism installation error of the strapdown inertial navigation system again.

Description

TECHNICAL FIELD

[0001] The present application relates to a prism installation error debugging method, belonging to the automatic test technical field. BACKGROUND

[0002] Generally, three gyroscopes, three accelerometers and a prism component are installed on the platform of a strapdown inertial navigation system, the prism component is used for calibrating the azimuth angle of the inertial unit, and the platform is installed on the base of the strapdown inertial navigation system through three groups of rubber dampers.

[0003] In the prior art, the prism installation error debugging method is to first calibrate the prism installation error, if the installation error exceeds the technical requirement, the prism component is disassembled, the installation surface of the prism component is polished, the prism component is reinstalled on the platform, the prism installation error is calibrated again, if it is unqualified, it is disassembled and polished again. The prism component is repeatedly disassembled and polished, thus the production efficiency is reduced, the production cost is increased, and some prisms do not allow the installation surface of the prism component to be polished. SUMMARY

[0004] The present application aims at the deficiencies of the prior art, and provides a prism installation error debugging method, which selects a group of dampers meeting the requirements by testing the height size and static stiffness of the dampers, and installs the dampers on the platform, so as to realize the purpose of not polishing the prism installation surface and installing the prism within the standard range.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0006] A prism installation error debugging method, comprising selecting dampers and installation debugging; the step of selecting dampers is: 1) selecting three dampers from a plurality of dampers, measuring the height size and static stiffness of the dampers, and recording the minimum static stiffness N and the maximum height difference M; 2) calculating the maximum height difference C allowed by the three dampers; 3) calculating the maximum static stiffness difference E allowed by the three dampers; 4) finding the required three groups of dampers according to the maximum height difference C allowed in step 2) and the maximum static stiffness difference E allowed in step 3); the installation debugging comprises the following steps: S1 installing the three groups of dampers selected according to step 4) of the step of selecting dampers on the lower side of the platform, and installing the prism component on the platform; S2 calibrating the installation error of the prism; S3 if the installation error of the prism is greater than the maximum value A of the allowed prism component installation error, repeating the steps 1) to 4) of the step of selecting dampers to reselect three groups of dampers.

[0007] Therefore, the application finds the shock absorber meeting the standard by calculating the allowed maximum height difference of the shock absorber and the allowed maximum static stiffness difference of the shock absorber and finding the shock absorber meeting the standard according to the allowed maximum height difference and the allowed maximum static stiffness difference. In the premise that the height of the shock absorber meets the standard, the three shock absorbers are ensured to be within the standard range in the static stiffness, so that the deformation amount of the shock absorber is consistent after the shock absorber is stressed, and the prism installation error is not affected.

[0008] According to the embodiments of the application, the application can be further optimized, and the following is the technical scheme formed after optimization:

[0009] Specifically, the step 2) of selecting the shock absorber comprises the following steps: 1) measuring the distance B from the first shock absorber to the second shock absorber; and 2) calculating the allowed maximum height difference C of the three shock absorbers: C = B x A / (57.3 x 3600), wherein A is the maximum value of the allowed prism component installation error.

[0010] Specifically, the step 3) comprises calculating the allowed maximum static stiffness difference E of the three shock absorbers according to the maximum height difference C of the shock absorber in the step 2): E = N x (C-M).

[0011] Compared with the prior art, the application has the following beneficial effects:

[0012] 1) The method of the application is simple and reliable, and generally only needs to select and match the shock absorber once, so that the prism installation error can be qualified, and the prism component does not need to be repeatedly disassembled and polished, thereby improving the production efficiency and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic view of a prism swing of the application.

[0014] In the drawings

[0015] 1 - strapdown inertial navigation system; 2 - table body; 3 - first shock absorber; 4 - second shock absorber; 5 - third shock absorber; 6 - prism component. DETAILED DESCRIPTION

[0016] The application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "up", "down", "left", "right" appear in the following text, they only mean the up, down, left and right directions consistent with the drawings themselves, and do not limit the structure.

[0017] The prism installation error debugging method of the embodiment is as follows:

[0018] which comprises selecting and debugging the shock absorber, and the step of selecting the shock absorber is:

[0019] 1) Select three dampers from several dampers, measure the height size and static stiffness of the dampers, and record the minimum static stiffness N and the maximum height difference M;

[0020] 2) Calculate the maximum height difference C of the three dampers allowed;

[0021] 3) Calculate the maximum static stiffness difference E of the three dampers allowed;

[0022] 4) Find the required three groups of dampers according to the maximum height difference C allowed in step 2) and the maximum static stiffness difference E allowed in step 3).

[0023] The step 2) of selecting dampers includes the following steps:

[0024] 1) Measure the distance B between the first damper and the second damper;

[0025] 2) Calculate the maximum height difference C of the three dampers allowed: C = B x A / (57.3 x 3600), wherein: A is the maximum value of the allowed prism component installation error.

[0026] As shown in Figure 1 The prism component 6 is installed on the table body, and the table body 2 is connected with the strapdown inertial navigation system 1 through the first damper 3, the second damper 4 and the third damper 5. The connecting line between the first damper 3 and the second damper 4 is theoretically parallel to the installation surface of the prism component 6, but due to the differences in size and static stiffness of the first damper 3, the second damper 4 and the third damper 5, the connecting line between the first damper 3 and the second damper 4 is not parallel to the installation surface of the prism component 6, which causes the installation error of the prism component 6.

[0027] Due to the height difference between the dampers, the table body 2 placed on the dampers is tilted, so that the prism component 6 is not placed flat, and there is an installation error. If the height difference C between the first damper 3 and the second damper 4 is within the allowed installation error range, then according to the trigonometric function relationship among the distance B (unit: millimeter) between the first damper 3 and the second damper 4, the height difference C (unit: millimeter) between the first damper 3 and the second damper 4 and the maximum value A (unit: angle seconds) of the allowed prism component installation error, it should satisfy A = C(57.3 x 3600) / B, so the maximum height difference C allowed is B x A / (57.3 x 3600). Among them, the maximum value A of the allowed prism component installation error and the distance B between the first damper 3 and the second damper 4 are fixed values.

[0028] Due to the difference in static stiffness of the three groups of shock absorbers, the deformation of each group of shock absorbers is inconsistent under the same pressure, and the deformation of the shock absorber with the smallest static stiffness is the largest, so the difference in stiffness of the shock absorbers is set as a limit condition.

[0029] The step 3) of selecting the shock absorbers comprises the following steps:

[0030] According to the allowed maximum height difference C of the shock absorbers obtained in step 2) of selecting the shock absorbers, the allowed maximum static stiffness difference of the three shock absorbers is calculated: E = N x (C-M), wherein the units of the allowed maximum height difference C and the measured maximum height difference M are both millimeters.

[0031] The derivation process of the formula E = N x (C-M) is as follows:

[0032] Suppose the force on each group of shock absorbers is x (unit: N), and the maximum difference in static stiffness of the three groups of shock absorbers is E (unit: N / mm), then

[0033]

[0034] In this embodiment, x = N, then ;

[0035] Since 1-(C-M)≈1, E = N x (C-M).

[0036] Then, according to the allowed maximum static stiffness difference E of the shock absorbers, three groups of shock absorbers that meet the requirements can be found, and then the installation and debugging step is entered.

[0037] The installation and debugging comprises the following steps:

[0038] S1 Install the three groups of shock absorbers selected in step 4) of the step of selecting the shock absorbers under the lower side of the table body, and install the prism component on the table body;

[0039] S2 Calibrate the installation error of the prism;

[0040] S3 If the installation error of the prism is greater than the maximum value A of the allowed prism component installation error, repeat steps 1) to 4) of the step of selecting the shock absorbers to reselect three groups of shock absorbers.

[0041] In practical application, the prism component 6 is installed on the table body 2, and the table body 2 is installed on the base of the strapdown inertial navigation system through a damper. By testing the height size and static stiffness of the damper, a group of dampers meeting the requirements are selected and installed on the table body of the strapdown inertial navigation system, and then the prism installation error of the strapdown inertial navigation system is calibrated. If it is unqualified, a group of dampers are selected and replaced, and then the prism installation error of the inertial unit is calibrated. Generally, only one damper needs to be selected and matched, and the prism installation error can be qualified, without the need of repeatedly disassembling and polishing the prism component, so that the production efficiency is improved and the production cost is reduced.

[0042] The above-mentioned embodiments should be understood as merely illustrative of the present application, and should not be used to limit the scope of the present application. After reading the present application, those skilled in the art can make various equivalent modifications to the present application, which fall within the scope defined by the appended claims.

Claims

1. A method of prism installation error debugging, characterized by: The method comprises the steps of selecting dampers and installing and debugging, wherein the step of selecting dampers comprises the steps of: 1) selecting three dampers from a plurality of dampers, measuring the height size and static stiffness of the dampers, and recording the minimum static stiffness N and the maximum height difference M; 2) calculating the maximum height difference C of the three dampers; The step 2) of selecting dampers comprises the steps of: a) measuring the distance B from the first damper to the second damper; b) calculating the maximum height difference C of the three dampers: C = B * A / (57.3 * 3600), wherein A is the maximum value of the allowed installation error of the prism component 3) calculating the maximum static stiffness difference E of the three dampers; The step 3) comprises calculating the maximum static stiffness difference E of the three dampers according to the maximum height difference C of the dampers in step 2): E = N * (C - M); 4) finding the required three groups of dampers according to the maximum height difference C allowed in step 2) and the maximum static stiffness difference E allowed in step 3); The installing and debugging comprises the steps of: installing the three groups of dampers selected in step 4) of the step of selecting dampers under the bottom of the table body, and installing the prism component on the table body; calibrating the installation error of the prism; if the installation error of the prism is greater than the maximum value A of the allowed installation error of the prism component, repeating the steps 1) to 4) of selecting dampers to reselect the three groups of dampers.

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