CN114353823A - Parameter matching method for inertia unit shock absorber - Google Patents
Parameter matching method for inertia unit shock absorber Download PDFInfo
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Abstract
A shock absorber matching method of an inertial navigation assembly can enable a shock absorber system to meet use requirements through performance parameter matching of a single shock absorber, provides a specific height difference measuring method aiming at the installation mode of the current shock absorber, simultaneously determines a static deformation amount and a static rigidity determining method, can provide a shock absorber size matching height size requirement range on the basis of the current method, and simultaneously provides a shock absorber rigidity matching requirement range, is not limited to an eight-point installation matching mode, and is clear in process and flexible in matching.
Description
Technical Field
The invention relates to a parameter matching method for an inertial measurement unit shock absorber, and belongs to the field of laser inertial navigation assembly design matching.
Background
The laser inertial navigation component is used as one of main devices of the control system, and the main working principle of the laser inertial navigation component is that a laser gyroscope and a quartz accelerometer are used as inertia sensitive components to measure information such as carrier speed, attitude and the like in real time, so that a basis is provided for navigation calculation of the control system. The strapdown inertial navigation system has the characteristics of simple structure, long service life, strong mechanical environment adaptability, higher reliability and the like. The laser gyro and the laser strapdown inertial navigation system formed by the laser gyro represent the development direction of future high-precision and high-reliability inertial measurement devices, and become core guidance control equipment of systems such as international air-borne transport rockets, airplanes, spaceships, missile weapons and the like.
During the flying process, the laser inertial measurement unit is excited by various aerodynamic forces and strong vibration transmitted from an engine, and the vibration components cause great deviation of attitude and position information output by the laser inertial measurement unit. The method frequently used at present is to reduce the influence of vibration through a vibration damper, but has many problems, such as the coupling problem of linear vibration and angular vibration, the out-of-tolerance problem of static inertia instruments and the like.
According to years of production experience, the shock absorber matching parameters are found to be one of important factors influencing the precision of the laser inertial measurement unit, the level difference and the consistency of the resonant frequency of the shock absorber are determined by calibrating and performing a vibration test on a whole product in the current shock absorber matching method, the process is complicated, the production flow is influenced, and the risk of damage to an inertial instrument caused by vibration is avoided.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the problems that in the prior art, the traditional shock absorber matching method is used for calibrating and performing a vibration test through a whole product machine, the process is complex, the generation flow is slow and the like, and the parameter matching method for the inertial group shock absorber is provided.
The technical scheme for solving the technical problems is as follows:
a parameter matching method for an inertial measurement unit shock absorber comprises the following steps:
(1) performing appearance inspection on the shock absorber, and selecting a shock absorber product which has no defect on the surface and meets the size requirement;
(2) mounting the selected shock absorber on a special tool, setting distribution positions of measuring points on the surface of the shock absorber, and measuring height difference parameters of a mounting surface and a measuring surface of the shock absorber at the distribution positions of all the measuring points by using a measuring instrument meeting the precision requirement;
(3) the method comprises the steps that the vibration absorber is installed on a static stiffness testing tool and jointly fixed on a static stiffness tester, two times of preloading and unloading tests are repeatedly carried out in the bearing direction of the vibration absorber, in addition, in the third preloading, the vibration absorber is gradually unloaded after the load peak value is kept for a specified time, and in the third preloading and unloading tests, the deformation values of the distribution positions of all measuring points on the vibration absorber in different loads are recorded;
(4) calculating the average deformation value of the distribution position of the same measuring point in the same preloading and unloading test according to the deformation value obtained in the step (3) and taking the average deformation value as the static deformation of the shock absorber at the point position;
(5) calculating the static rigidity of the shock absorber;
(6) and (4) judging whether the current shock absorber meets the matching standard or not according to the data obtained in the step (3), the step (4) and the step (5) and the specific requirements of the shock absorber matching.
In the step (2), the method for measuring the height difference parameter specifically includes:
measuring the height difference values of the highest point, the lowest point and the mounting surface at the distribution positions of all the measuring points, and calculating the average original height and the original height difference of the shock absorber according to the obtained height difference values, wherein the calculation formula is as follows:
ΔHo＝Ho+-Ho-
in the formula, the height difference between the highest point of the distribution positions of the measuring points and the mounting surface, and the height difference between the lowest point of the distribution positions of the measuring points and the mounting surface.
In the step (3), the axial direction of the shock absorber is consistent with the compression or stretching direction of the static stiffness tester.
In the step (3), in the preloading and unloading tests, the loading load range is 0-1.25 times of the rated load of the vibration reducer, and the loading speed is not more than 8 mm/min.
In the step (3), the third preloading is performed for 30s at the peak load value.
In the step (3), the deformation values of the distribution positions of the measurement points at least include deformation values of 0.9, 1 and 1.1 times of rated load.
In the step (5), the calculation formula of the static stiffness of the damper is as follows:
in the formula, P0The nominal load of the shock absorber, Δ P-the increment of the static load, Δ X-the increment of the static deformation, X0.9，X1.1-static deformation at 0.9 and 1.1 times rated load, respectively.
Compared with the prior art, the invention has the advantages that:
according to the parameter matching method for the inertial group shock absorber, the shock absorption system can meet the use requirement through performance parameter matching of a single shock absorber, a specific height difference measuring method is provided for the current shock absorber installation mode, the static deformation and static rigidity determining method is determined at the same time, the shock absorber size matching height size requirement range can be provided on the basis of the current method, the shock absorber rigidity matching requirement range is provided at the same time, the method is not limited to an eight-point installation matching mode, the resonance frequency of the shock absorption system can be controlled through matching the shock absorber static rigidity, the method flow is clear, and the matching is flexible.
Drawings
FIG. 1 is a flow chart of a conventional shock absorber fitting method provided by the present invention;
FIG. 2 is a schematic diagram of the dimensional structure of the shock absorber provided by the invention;
FIG. 3 is a flow chart of a method for selecting a damper for an inertial navigation module according to the present invention;
Detailed Description
A method for selecting and matching parameters of an inertial group shock absorber is improved aiming at the existing shock absorber selecting and matching process shown in figure 1, a shock absorption system can meet the use requirement through the performance parameter matching of a single shock absorber, the installation mode of the shock absorber for the existing laser inertial group inertia sensitive component is roughly divided into a mode of four-point or eight-point symmetrical arrangement on two opposite installation surfaces of the component, the height size of the shock absorber is matched, the deformation is confirmed, and the rigidity is calculated, and the specific process is as shown in figure 3:
(1) performing appearance inspection on the shock absorber, and selecting a shock absorber product which has no defect on the surface and meets the size requirement;
(2) mounting the selected shock absorber on a special tool, as shown in fig. 2, setting distribution positions of measuring points on the surface of the shock absorber, and measuring height difference parameters of a mounting surface and a measuring surface of the shock absorber at the distribution positions of all the measuring points by using a measuring device meeting the precision requirement;
the method for measuring the height difference parameters specifically comprises the following steps:
measuring the height difference values of the highest point, the lowest point and the mounting surface at the distribution positions of all the measuring points, and calculating the average original height and the original height difference of the shock absorber according to the obtained height difference values, wherein the calculation formula is as follows:
ΔHo＝Ho+-Ho-
in the formula, the height difference between the highest point of the distribution positions of the measuring points and the mounting surface, and the height difference between the lowest point of the distribution positions of the measuring points and the mounting surface;
(3) the method comprises the steps that the vibration absorber is installed on a static stiffness testing tool and jointly fixed on a static stiffness tester, the axial direction of the vibration absorber is consistent with the compression or stretching direction of the static stiffness tester, two times of preloading and unloading tests are repeatedly carried out in the bearing direction of the vibration absorber, in the third preloading, the vibration absorber is gradually unloaded after a load peak value is kept for a specified time, and deformation values of distribution positions of measuring points on the vibration absorber in the three times of preloading and unloading tests and different loads are recorded;
in the preloading and unloading tests, the loading load range is 0-1.25 times of the rated load of the vibration reducer, and the loading speed is not more than 8 mm/min; during the third preloading, the load peak value needs to be kept for 30 s; the deformation value of the distribution position of each measuring point at least comprises the deformation value under the condition of 0.9, 1 and 1.1 times of rated load;
(4) calculating the average deformation value of the distribution position of the same measuring point in the same preloading and unloading test according to the deformation value obtained in the step (3) and taking the average deformation value as the static deformation of the shock absorber at the point position;
(5) calculating the static rigidity of the shock absorber;
the calculation formula of the static rigidity of the shock absorber is as follows:
in the formula, P0The nominal load of the shock absorber, Δ P-the increment of the static load, Δ X-the increment of the static deformation, X0.9，X1.1-static deformation at 0.9 and 1.1 times rated load, respectively;
(6) and (4) judging whether the current shock absorber meets the matching standard or not according to the data obtained in the step (3), the step (4) and the step (5) and the specific requirements of the shock absorber matching.
The following is further illustrated with reference to specific examples:
in this embodiment, for an installation and matching method of an eight-point shock absorber for a laser inertial measurement unit sensitive element component, a specific matching process is as follows:
the surface of the shock absorber product has no phenomena of scratching, degumming, tearing or burrs and the like, and the surface of the rubber material has no air holes, cracks, aging, impurities, local defects and the like; the surface of the metal material should be smooth and free of oil stains and redundant sizing materials: the internal thread should be clean and complete, and the size meets the requirements.
The vibration damper is installed on a special tool, the height difference between the installation surface (surface A) and the measurement surface (surface B) shown in figure 3 is measured by a measuring device with the precision superior to 0.01mm, and 4 measurement point distribution positions are selected from the specific positions of the measurement surface (surface B) and the installation surface (surface A). After the measurement, the values Ho +, Ho-of the height difference between the highest + and lowest-points and the a-plane are recorded.
Average original height:
original height difference: Δ Ho ═ Ho+-Ho-。
A single shock absorber is arranged on the static stiffness testing tool and fixed on the static stiffness tester together, and the axial direction of the shock absorber is kept consistent with the compression (or stretching) direction of the static stiffness tester;
according to the requirements of national standard GB/T15168, the secondary preloading and unloading test is repeatedly carried out in the bearing direction of the shock absorber, the load range is from zero to 1.25 times of the rated load, the shock absorber deformation is uniform, and the loading rate is not greater than 8 mm/min.
And gradually loading from zero to 1.25 times of rated load for the third time, keeping for 30s, gradually unloading to zero, and recording deformation values of each point during loading and unloading (at least 0.9 time, 1 time and 1.1 time of rated load). The average deformation value (i.e. the average value of the deformation values of the loading and unloading loads under the same load) is taken as the static deformation.
The static stiffness Ks of the shock absorber is calculated according to the following formula:
in the formula, P0The nominal load of the shock absorber, Δ P-the increment of the static load, Δ X-the increment of the static deformation, X0.9，X1.1-static deformation at 0.9 and 1.1 times rated load, respectively.
For the laser inertial measurement unit, a four-point shock absorber mounting structure is adopted, two shock absorbers in the same batch with the height difference delta H of the two shock absorbers on one surface not larger than 0.03mm are matched into a pair, the total height of the two paired shock absorbers is in accordance with H +/-0.1 mm, the height is the distance between the highest point of a measuring surface and the highest point of a mounting surface, and the static stiffness of the four shock absorbers is controlled within the range of +/-1 N.mm; for the laser inertial measurement unit, an eight-point shock absorber mounting structure is adopted, two shock absorbers in the same batch with the height difference delta H of four shock absorbers on one surface not larger than 0.03mm are matched into a pair, the total height of the two paired shock absorbers is in accordance with H +/-0.1 mm, the height is the distance between the highest point of a measuring surface and the highest point of a mounting surface, and the static stiffness of the eight shock absorbers is controlled within the range of +/-1 N.mm; the vibration dampers in the same batch are selected as much as possible for matching, and if the vibration dampers cannot be matched in the same batch, the vibration dampers can be matched in different batches.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (7)
1. A shock absorber matching method of an inertial navigation component is characterized by comprising the following steps:
(1) performing appearance inspection on the shock absorber, and selecting a shock absorber product which has no defect on the surface and meets the size requirement;
(2) mounting the selected shock absorber on a special tool, setting distribution positions of measuring points on the surface of the shock absorber, and measuring height difference parameters of a mounting surface and a measuring surface of the shock absorber at the distribution positions of all the measuring points by using a measuring instrument meeting the precision requirement;
(3) the method comprises the steps that the vibration absorber is installed on a static stiffness testing tool and jointly fixed on a static stiffness tester, two times of preloading and unloading tests are repeatedly carried out in the bearing direction of the vibration absorber, in addition, in the third preloading, the vibration absorber is gradually unloaded after the load peak value is kept for a specified time, and in the third preloading and unloading tests, the deformation values of the distribution positions of all measuring points on the vibration absorber in different loads are recorded;
(4) calculating the average deformation value of the distribution position of the same measuring point in the same preloading and unloading test according to the deformation value obtained in the step (3) and taking the average deformation value as the static deformation of the shock absorber at the point position;
(5) calculating the static rigidity of the shock absorber;
(6) and (4) judging whether the current shock absorber meets the matching standard or not according to the data obtained in the step (3), the step (4) and the step (5) and the specific requirements of the shock absorber matching.
2. The method of claim 1, wherein the method further comprises the steps of:
in the step (2), the method for measuring the height difference parameter specifically includes:
measuring the height difference values of the highest point, the lowest point and the mounting surface at the distribution positions of all the measuring points, and calculating the average original height and the original height difference of the shock absorber according to the obtained height difference values, wherein the calculation formula is as follows:
ΔHo＝Ho+-Ho-
in the formula, the height difference between the highest point of the distribution positions of the measuring points and the mounting surface, and the height difference between the lowest point of the distribution positions of the measuring points and the mounting surface.
3. The method of claim 1, wherein the method further comprises the steps of:
in the step (3), the axial direction of the shock absorber is consistent with the compression or stretching direction of the static stiffness tester.
4. The method of claim 1, wherein the method further comprises the steps of:
in the step (3), in the preloading and unloading tests, the loading load range is 0-1.25 times of the rated load of the vibration reducer, and the loading speed is not more than 8 mm/min.
5. The method of claim 1, wherein the method further comprises the steps of:
in the step (3), the third preloading is performed for 30s at the peak load value.
6. The method of claim 1, wherein the method further comprises the steps of:
in the step (3), the deformation values of the distribution positions of the measurement points at least include deformation values of 0.9, 1 and 1.1 times of rated load.
7. The method of claim 1, wherein the method further comprises the steps of:
in the step (5), the calculation formula of the static stiffness of the damper is as follows:
in the formula, P0The nominal load of the shock absorber, Δ P-the increment of the static load, Δ X-the increment of the static deformation, X0.9，X1.1-static deformation at 0.9 and 1.1 times rated load, respectively.
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2021
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| JP2002357015A (en) * | 2001-05-31 | 2002-12-13 | Tokico Ltd | Vibration control device |
| DE102008040535A1 (en) * | 2008-07-18 | 2010-01-21 | Robert Bosch Gmbh | Method for controlling adjustable damper of motor vehicle, involves determining acceleration or rotating rate from inertial sensor system for controlling adjustment of damper |
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