CN114264460B - Dynamic stiffness testing device of rubber shock absorber and mounting method - Google Patents
Dynamic stiffness testing device of rubber shock absorber and mounting method Download PDFInfo
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- 230000035939 shock Effects 0.000 title claims abstract description 83
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
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Abstract
The invention provides a dynamic stiffness testing device of a rubber shock absorber and an installation method. The dynamic stiffness testing device of the rubber shock absorber consists of a main machine executing system, a control measuring system and a hydraulic system; the host execution system mainly provides input of a support carrier and load for the shock absorber; the control system realizes the adjustment of the load frequency, the load size and the waveform of the shock absorber, the real-time monitoring of the working state, and the data acquisition, analysis and processing of the load and the displacement; the hydraulic system provides a required power source for dynamic stiffness test of the shock absorber and has overload protection device and safety interlocking function. According to the dynamic stiffness test device, dynamic stiffness test is carried out on the shock absorber. The vibration isolation effect of the selected vibration absorber is improved by 2dB (10 Hz-8 kHz), the overall acoustic installation quality of ship equipment is improved, and the overall construction efficiency is improved; the dynamic stiffness testing device is suitable for being applied as a dynamic stiffness testing device of a rubber shock absorber and an installation method.
Description
Technical Field
The invention relates to the field of mechanical equipment installation in ships, in particular to a dynamic stiffness testing device and an installation method for a rubber shock absorber.
Background
The rubber vibration damper is used as a bridge of a vibration transmission channel of the equipment-ship body, and the dynamic performance of the rubber vibration damper directly influences the transmission of the vibration of the equipment in the course of sailing. In the sailing vibration noise testing process, although the vibration absorber is installed qualified, the result shows that the vibration level drop between the machine leg and the base of the equipment is smaller, namely the vibration isolation effect of the vibration absorber is poor, and in order to improve the vibration isolation effect of the vibration absorber, the dynamic stiffness value test and installation for representing the dynamic performance of the rubber vibration absorber are particularly important. As the number of the marine rubber vibration absorbers is large, and the dynamic stiffness test time of the vibration absorbers is long, the dynamic performance test before the vibration absorber installation is not performed by the current domestic shipyard, and the low-noise installation quality of equipment is restricted.
Therefore, there is an urgent need to develop a static stiffness test device for a rubber shock absorber, and to formulate an installation method according to the dynamic performance of the shock absorber. Thereby improving the installation state of the ship rubber shock absorber and improving the acoustic installation level of the equipment.
Disclosure of Invention
In order to solve the problem of dynamic stiffness test of the rubber shock absorber, the invention provides a dynamic stiffness test device of the rubber shock absorber and an installation method. According to the method, the dynamic stiffness of the vibration absorber is tested and then selected through the testing device, so that the final installation posture and the external interface requirement of the equipment are guaranteed, the vibration isolation effect of the rubber vibration absorber is improved by 2dB, the acoustic installation quality of the rubber vibration absorber is improved, and the technical problem of dynamic stiffness detection of the rubber vibration absorber is solved.
The technical scheme adopted for solving the technical problems is as follows:
the dynamic stiffness testing device of the rubber shock absorber consists of a main machine executing system, a control measuring system and a hydraulic system;
the host execution system mainly provides input of a support carrier and load for the shock absorber; the control measurement system realizes the adjustment of the load frequency, the load size and the waveform of the shock absorber, the real-time monitoring of the working state, and the data acquisition, analysis and processing of the load and the displacement; the hydraulic system provides a required power source for dynamic stiffness test of the shock absorber and has overload protection device and safety interlocking function.
In order to further solve the technical problem to be solved, the host executing system provided by the invention comprises a dynamic loading mechanism, a force sensor, a displacement sensor, a movable cross beam, a base, guide posts, a lifting locking tool, stand columns, an acceleration sensor I, an acceleration sensor II and a clamp, wherein stand columns are uniformly arranged around the base, racks are arranged on the stand columns and penetrate through the movable cross beam, the middle part of the movable cross beam penetrates through the dynamic loading mechanism, the force sensor is arranged below a force shaft at the bottom of the dynamic loading mechanism, the guide posts fixed on the base are symmetrically penetrated through the two sides of the movable cross beam, and the guide posts and the stand columns ensure the linear loading of the pressure of the dynamic loading mechanism; the lifting locking tool enables the movable cross beam to move up and down along the upright post and be locked.
Further, the control and measurement system mainly comprises a display console, a total control unit and a data acquisition unit; the total control unit distributes control instructions to the hydraulic control unit and the lifting control unit; the display control console processes and sorts the test data information through the data analysis and processing module, calculates, displays the dynamic stiffness curve in real time, and stores the dynamic stiffness curve in a database.
After the display control console of the control measurement system sets test parameters, the control unit sends control instructions to the total control unit, the total control unit distributes instructions to the hydraulic control unit, the hydraulic control unit sends instructions to the servo valve, the dynamic loading mechanism is controlled to drive the power shaft to realize accurate loading, and analog signals generated by the force sensor and the displacement sensor are transmitted to the control unit and then uploaded to the display control console.
After the display control console of the control measurement system sets test parameters, the control instructions are sent to the total control unit, the total control unit distributes the instructions to the lifting control unit to control the lifting locking tool, and therefore the height of the movable cross beam is adjusted.
Further, the hydraulic system mainly comprises a hydraulic control unit, a hydraulic oil pump, an energy accumulator and a servo valve; and starting the hydraulic control unit, sending an instruction to the servo valve by the hydraulic control unit, and pressurizing the hydraulic oil pump into the accumulator to maintain the pressure of the driving loading mechanism.
Further, the lifting locking tool consists of a hydraulic motor and a gear; after the height of the beam is set by the display control console of the control system, the hydraulic motor is controlled to drive the gear to move up and down along the rack by sending an instruction to the lifting control unit, so that the height of the movable beam is adjusted, and the safety locking function is realized.
A dynamic stiffness test and installation method of a rubber shock absorber comprises the following steps:
1) Selecting a plurality of vibration absorbers to be tested, connecting one vibration absorber with a clamp through bolts, installing mass blocks above and below the vibration absorbers, arranging an acceleration sensor I and an acceleration sensor II on the mass blocks, and fixing the vibration absorbers on a T-shaped groove base through the clamp.
2) After the lifting locking tool is started, the display control console of the control system sets the height of the cross beam, and the hydraulic motor is controlled to drive the gear to move up and down along the rack by sending an instruction to the lifting control unit, so that the height of the movable cross beam is adjusted and locked.
3) Starting a hydraulic control unit, setting static control parameters for a display console of a control system, and applying static pre-load to the shock absorber; and the total control unit distributes an instruction to the hydraulic control unit by sending a control instruction to the total control unit, and the hydraulic control unit sends the instruction to the servo valve to control the dynamic loading mechanism to drive the power shaft to realize static pre-loading.
4) And (3) pre-loading: the shock absorber is repeatedly pre-loaded and unloaded for three times in the vertical direction, the load range is kept for 30s from zero to 1.25 times of the rated load, then the shock absorber is gradually unloaded to zero, and the deformation speed of the shock absorber is uniform. Finally, rated load is applied to the shock absorber, and static deformation of the shock absorber in the last ballasting is recorded;
5) Applying exciting force: the operation mode is the same as that of the step 4), dynamic control parameters are set for a display console of a control system, dynamic loading is achieved, and analog signals generated by the force sensor, the displacement sensor, the acceleration sensor I and the acceleration sensor II are transmitted to a data acquisition unit and then uploaded to the display console;
6) Checking the base rigidity: if A1/A2 is more than or equal to 10, the measurement is effective, wherein A1 is the acceleration value of the acceleration sensor II, and A2 is the acceleration value of the acceleration sensor I.
7) The display control console processes, sorts and calculates the test data information through the data analysis processing module, displays the dynamic stiffness curve in real time, automatically calculates the dynamic stiffness value of each shock absorber, and stores the dynamic stiffness value into the database.
8) And (3) performing the operation on a plurality of vibration absorbers to be tested, and testing the dynamic stiffness value of each vibration absorber.
9) Screening each shock absorber to select 4 shock absorbers; the screening method comprises the following steps: the dynamic stiffness value is controlled within 10 percent.
10 Sorting the vibration dampers according to the type according to the dynamic stiffness value of the vibration dampers after screening.
11 The vibration damper with high dynamic stiffness is arranged at one end of the vibration damper with high bearing load, namely one end of the equipment with heavier weight; the less stiff damper is mounted at the end of the damper that is less loaded, i.e. at the lighter end of the device.
12 Pre-pressing according to pre-pressing time before the vibration damper is installed, and eliminating rubber creep.
13 Measuring the actual height between the equipment leg mounting panel on the shock absorber and the base mounting panel under the shock absorber, determining the adjustment quantity of the adjustment gasket of each shock absorber which is required to reach the theoretical height in the equipment mounting diagram, and manufacturing the adjustment gasket.
14 Diagonally mounting the four-corner vibration damper of the equipment, fastening the bolts after the four-corner vibration damper is mounted in place, and fastening the bolts.
15 Damper mounting surface gap control): the clearance between the contact bottom surface of the shock absorber and the mounting surface of the base is controlled as follows: with a 0.05mm thick feeler, no 2/3 of the circumference of the contact surface perimeter should be inserted, and the insertable portion should be loose, its insertion depth should not exceed 15mm;
the gap limit value between the contact top surface and the adjusting washer, and between the adjusting washer and the machine foot of the equipment is as follows: with a 0.05mm thick feeler, the adjusting shim should not be inserted 2/3 of the circumference and the insertable part should be loose and its depth of insertion should not exceed 1/3 of its radius.
16 After the equipment is installed, measuring the vibration isolation effect of the vibration absorber.
The positive effects are as follows: the dynamic stiffness test device is composed of the host machine execution system, the control measurement system and the hydraulic system, so that the dynamic stiffness test is carried out on the shock absorber. The vibration isolation effect of the selected vibration absorber is improved by 2dB (10 Hz-8 kHz), and the overall acoustic installation quality of ship equipment is improved; the technical problem of large dispersion of vibration isolation effect among ship isotype equipment is solved, the rectifying and modifying risk is reduced, and the overall construction efficiency is improved. The method is simple and convenient to operate, effectively reduces the screening difficulty of the equipment damper, and reduces the labor intensity of constructors; the testing device and the testing method are also suitable for mounting equipment vibration dampers in other industries, and have extremely strong universality. The dynamic stiffness testing device is suitable for being applied as a dynamic stiffness testing device of a rubber shock absorber and an installation method.
Drawings
FIG. 1 is a perspective view of a host execution system according to the present invention;
FIG. 2 is a perspective view of the fixture and base assembly of the present invention;
FIG. 3 is a diagram of a control system architecture of the present invention;
FIG. 4 is a schematic diagram of a hydraulic system according to the present invention;
FIG. 5 is a perspective view of a dynamic loading mechanism;
FIG. 6 is a diagram of a lift-and-lock tooling.
In the figure: 1. dynamic loading mechanism, 2, force sensor, 3, movable cross beam, 4, base, 5, guide post, 6, locking tool, 7, stand, 8, shock absorber, 9, acceleration sensor I, 10, clamp, 11, display console, 12, hydraulic control unit, 13, hydraulic oil pump, 14, general control unit, 15, energy accumulator, 16, servo valve, 17, data acquisition unit, 18, acceleration sensor II, 19, displacement sensor, 20, hydraulic oil cylinder, 21, force axle, 22, lifting control unit, 23, hydraulic motor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the present invention, all the embodiments, implementations and features of the invention may be combined with each other without contradiction or conflict. In the present invention, conventional equipment, devices, components, etc., are either commercially available or homemade in accordance with the present disclosure. In the present invention, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the gist of the present invention.
According to the figure, the dynamic stiffness testing device of the rubber shock absorber consists of a host machine executing system, a control measuring system and a hydraulic system;
the host execution system mainly provides input of a support carrier and load for the shock absorber;
the control system realizes the adjustment of the load frequency, the load size and the waveform of the shock absorber, the real-time monitoring of the working state, and the data acquisition, analysis and processing of the load and the displacement;
the hydraulic system provides a required power source for dynamic stiffness test of the shock absorber and has overload protection device and safety interlocking function.
In order to ensure the stability of the structure of the invention, the host executing system comprises a dynamic loading mechanism 1, a force sensor 2, a displacement sensor 19, a movable cross beam 3, a base 4, a guide post 5, a locking tool 6, a stand column 7, an acceleration sensor I9, an acceleration sensor II 18 and a clamp 10, wherein the stand column 7 is uniformly arranged around the base 4, a rack is arranged on the stand column 7, the movable cross beam 3 penetrates through the stand column 7, the dynamic loading mechanism 1 penetrates through the movable cross beam 3, the force sensor 2 is arranged below a force shaft 21 at the bottom of the dynamic loading mechanism 1, the guide posts 5 fixed on the base 4 symmetrically penetrate through the two sides of the movable cross beam 3, and the guide posts 5 and the stand column 7 ensure the linear loading of the pressure of the dynamic loading mechanism 1; the lifting locking tool 6 drives the movable cross beam 3 to move up and down along the upright post 7 and has a safety interlocking function.
In order to further ensure the stability of the invention, the dynamic loading mechanism 1 adopts a valve servo 16 to drive a piston to move up and down in the hydraulic oil cylinder 20, so that the force shaft 21 is controlled to load the shock absorber 8, and the dynamic loading mechanism has higher transmission precision, loading control precision and speed control precision.
In order to optimize the structure of the invention, the shock absorber 8 is connected with the clamp 10 through bolts, an acceleration sensor II 18 and a displacement sensor 19 are arranged on a mass block at the top of the shock absorber 8, and the shock absorber 8 is fixed on a T-shaped groove of the base 4 through the clamp 10.
As a conventional technical choice, the locking tool 6 consists of a hydraulic motor 23, a lifting control unit 22 and a gear; after the display control console 11 of the control system sets the height of the beam, the hydraulic motor 23 is controlled to drive the gear to move up and down along the rack by sending an instruction to the lifting control unit 22, so that the height of the movable beam 3 is adjusted, and the safety locking function is achieved.
In order to optimize the stability of the structure of the invention, the control and measurement system mainly comprises a display console 11, a total control unit 14 and a data acquisition unit 17; the display console 11 processes, sorts and calculates the test data information through the data analysis processing module, displays the dynamic stiffness curve in real time and stores the dynamic stiffness curve in a database;
after the display control console 11 of the control measurement system sets test parameters, the control command is sent to the total control unit 14, the total control unit 14 distributes the command to the hydraulic control unit 12, the hydraulic control unit 12 sends the command to the servo valve 16, the dynamic loading mechanism 1 is controlled to drive the power shaft 21 to realize loading, and at the moment, analog signals generated by the force sensor 2 and the displacement sensor 19 are transmitted to the total control unit 14 and then uploaded to the display control console 11;
after the display control console 11 of the control measurement system sets the test parameters, the control instruction is sent to the total control unit 14, the total control unit 14 distributes the instruction to the lifting control unit 22, and the hydraulic motor 23 is controlled to drive the gear to move up and down along the rack, so that the height of the movable cross beam 3 is adjusted.
In order to optimize the structure of the invention still further, the hydraulic system mainly comprises a hydraulic control unit 12, a hydraulic oil pump 13, an energy accumulator 15 and a servo valve 16; the hydraulic control unit 12 is started, the hydraulic control unit 12 sends a command to the servo valve 16, the hydraulic oil pump 13 pressurizes the accumulator 15, and the pressure for driving the dynamic loading mechanism 1 is maintained.
The detailed test and installation method is as follows, taking BE type shock absorber as an example:
1) Selecting 10 BE400 type vibration dampers, firstly connecting a BE400 vibration damper 8 with a clamp 10 through bolts, installing mass blocks above and below the vibration damper 8, arranging an acceleration sensor I9 and an acceleration sensor II 18 on the mass blocks, and fixing the vibration damper 8 on a T-shaped groove base 4 through the clamp 10.
2) After the lifting locking tool 6 is started, the display control console 11 of the control system sets the height of the beam, and an instruction is sent to the lifting control unit 22 to control the hydraulic motor 23 to drive the gear to move up and down along the rack, so that the height of the movable beam 3 is adjusted and locked.
3) Starting a hydraulic control unit 12, setting static control parameters for a display console 11 of a control system, and applying static pre-load to the shock absorber 8; by sending a control command to the overall control unit 14, the overall control unit 14 distributes the command to the hydraulic control unit 12, and the hydraulic control unit 12 sends the command to the servo valve 16, controlling the dynamic loading mechanism 1 to drive the power shaft 21 to realize static pre-loading.
4) And (3) pre-loading: the shock absorber 8 is repeatedly pre-loaded and unloaded three times in the vertical direction, the load range is kept for 30s from zero to 1.25 times of the rated load, then the shock absorber 8 is gradually unloaded to zero, and the deformation speed of the shock absorber 8 is uniform. Finally, rated load is applied to the shock absorber 8, and the static deformation of the shock absorber 8 in the last ballasting is recorded;
5) Applying exciting force: the operation mode is the same as that of the step 4), dynamic control parameters are set for the display console 11 of the control system, dynamic loading is realized, and at the moment, analog signals generated by the force sensor 2, the displacement sensor 19, the acceleration sensor I9 and the acceleration sensor II 18 are transmitted to the data acquisition unit 17 and then uploaded to the display console 11;
6) Checking the base rigidity: if A1/A2 is more than or equal to 10, the measurement is effective, wherein A1 is the acceleration value of an acceleration sensor II 18, and A2 is the acceleration value of an acceleration sensor I9.
7) The display console 11 processes, sorts and calculates the test data information through the data analysis processing module, displays the dynamic stiffness curve in real time, automatically calculates the dynamic stiffness value of each shock absorber 8, and stores the dynamic stiffness value into a database.
8) The above-described operations were performed on 10 pieces of the BE400 type shock absorbers 8, and the dynamic stiffness value of each of the shock absorbers 8 was tested.
9) Screening 10 vibration dampers 8 to select 4 vibration dampers 8; the screening method comprises the following steps: the dynamic stiffness value is controlled within 10 percent.
10 The vibration dampers 8 are ordered according to the type according to the magnitude of the dynamic stiffness value of the vibration dampers 8 after screening.
11 The vibration damper 8 with high dynamic stiffness is arranged at one end of the vibration damper 8 bearing a larger load, namely, one end of the equipment with heavier weight; the less stiff damper 8 is mounted at the end of the damper 8 that is less loaded, i.e. at the lighter end of the device.
12 Pre-pressing the shock absorber 8 according to the pre-pressing time before installation, eliminating the rubber creep.
13 Measuring the actual height between the equipment leg mounting panel on the damper 8 and the base mounting panel under the damper 8, determining the adjustment amount of the adjustment shim for each damper 8 to reach the theoretical height in the equipment mounting diagram, and manufacturing the adjustment shim.
14 Diagonally mounting the four-corner vibration damper 8 of the equipment, not fastening bolts, and fastening the bolts after the four-corner vibration damper 8 is mounted in place.
15 Damper 8 mounting surface clearance control): the clearance between the contact bottom surface of the damper 8 and the base mounting surface is controlled as follows: with a 0.05mm thick feeler, no 2/3 of the circumference of the contact surface perimeter should be inserted, and the insertable portion should be loose, its insertion depth should not exceed 15mm;
the gap limit value between the contact top surface and the adjusting washer, and between the adjusting washer and the machine foot of the equipment is as follows: with a 0.05mm thick feeler, the adjusting shim should not be inserted 2/3 of the circumference and the insertable part should be loose and its depth of insertion should not exceed 1/3 of its radius.
16 After the installation of the apparatus is completed, the vibration isolation effect of the damper 8 is measured.
Compared with the traditional installation method, the vibration isolation effect (the fall of vibration acceleration level) of each group of vibration absorbers 8 is improved by more than 2dB (10 Hz-8 kHz).
The invention is characterized in that:
1. after the dynamic stiffness testing device and the dynamic stiffness testing method are used for installation, the vibration isolation effect (the drop of vibration acceleration level) of each group of vibration absorbers is improved by 2dB (10 Hz-8 kHz), and the overall acoustic installation quality of ship equipment is improved;
2. the technical problem of large dispersion of vibration isolation effect among ship homotype equipment is solved, the rectifying and modifying risk is reduced, and the overall construction efficiency is improved;
3. the method is simple and convenient to operate, the screening difficulty of the equipment damper is greatly reduced, and the labor intensity of constructors is reduced;
4. the testing device and the testing method are also suitable for mounting equipment vibration dampers in other industries, and have extremely strong universality.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (7)
1. A dynamic stiffness testing and installing method of a rubber shock absorber adopts a dynamic stiffness testing device of the rubber shock absorber, and is characterized in that:
the dynamic stiffness testing device of the rubber shock absorber consists of a main machine executing system, a control measuring system and a hydraulic system;
the host machine execution system mainly provides input of a support carrier and load for the shock absorber (8); the host executing system comprises a dynamic loading mechanism (1), a force sensor (2), a displacement sensor (19), a movable cross beam (3), a base (4), a guide column (5), a locking tool (6), an upright post (7), an acceleration sensor I (9), an acceleration sensor II (18) and a clamp (10); the locking tool (6) consists of a hydraulic motor (23), a lifting control unit (22) and a gear;
the control measurement system realizes the adjustment of the load frequency, the load size and the waveform of the shock absorber (8), the real-time monitoring of the working state and the data acquisition, analysis and processing of the load and the displacement; the control and measurement system mainly comprises a display control console (11), a total control unit (14) and a data acquisition unit (17);
the hydraulic system provides a required power source for dynamic stiffness test of the shock absorber and has the functions of overload protection and safety interlocking; the hydraulic system mainly comprises a hydraulic control unit (12), a hydraulic oil pump (13), an energy accumulator (15) and a servo valve (16);
the method comprises the following steps:
1) Selecting a plurality of vibration absorbers to be tested, connecting one vibration absorber (8) with a clamp through a bolt, installing mass blocks above and below the vibration absorber (8), arranging an acceleration sensor I (9) and an acceleration sensor II (18) on the mass blocks, and fixing the vibration absorber (8) on a T-shaped groove base (4) through a clamp (10);
2) After the lifting locking tool (6) is started, the display control console (11) of the control system sets the height of the movable cross beam (3), and a hydraulic motor (23) is controlled to drive a gear to move up and down along a rack by sending a command to a lifting control unit (22), so that the height of the movable cross beam (3) is adjusted and locked;
3) Starting a hydraulic control unit (12), setting static control parameters for a display console (11) of a control system, and applying static pre-load to a shock absorber (8); by sending a control instruction to the total control unit (14), the total control unit (14) distributes the instruction to the hydraulic control unit (12), the hydraulic control unit (12) sends the instruction to the servo valve (16), and the dynamic loading mechanism (1) is controlled to drive a bottom force shaft (21) of the dynamic loading mechanism (1) to realize static pre-loading;
4) And (3) pre-loading: repeatedly pre-loading and unloading the shock absorber (8) for three times in the vertical direction, keeping for 30s after the load range is from zero to 1.25 times of the rated load, gradually unloading to zero, and ensuring that the deformation speed of the shock absorber (8) is uniform; finally, rated load is applied to the shock absorber (8), and static deformation of the shock absorber (8) in the last ballasting is recorded;
5) Applying exciting force: the operation mode is the same as that of the step 4), dynamic control parameters are set for a display console (11) of a control system, dynamic loading is achieved, and at the moment, analog signals generated by a force sensor (2), a displacement sensor (19), an acceleration sensor I (9) and an acceleration sensor II (18) are transmitted to a data acquisition unit (17) and then uploaded to the display console (11);
6) Checking the base rigidity: checking that A1/A2 is more than or equal to 10, and measuring effectively, wherein A1 is the acceleration value of an acceleration sensor II (18), and A2 is the acceleration value of an acceleration sensor I (9);
7) The display control console (11) processes, sorts and calculates the test data information through the data analysis processing module, displays a dynamic stiffness curve in real time, automatically calculates the dynamic stiffness value of each shock absorber (8), and stores the dynamic stiffness value into the database;
8) The operation is carried out on a plurality of vibration absorbers (8) to be tested, and the dynamic stiffness value of each vibration absorber (8) is tested;
9) Screening each shock absorber (8), and selecting 4 shock absorbers (8); the screening method comprises the following steps: the dynamic stiffness value is controlled within 10 percent;
10 Sorting the vibration dampers (8) according to the type according to the dynamic stiffness value of the vibration dampers (8) after screening;
11 The vibration damper (8) with high dynamic stiffness is arranged at one end of the vibration damper (8) with high bearing load, namely, one end of the equipment with heavier weight; the shock absorber (8) with smaller rigidity is arranged at one end of the shock absorber (8) with smaller bearing load, namely at one end of the device with lighter weight;
12 Pre-pressing the shock absorber (8) according to pre-pressing time before installation to eliminate rubber creep;
13 Measuring the actual height between the equipment leg mounting panel on the shock absorber (8) and the base mounting panel under the shock absorber (8), determining the adjustment quantity of the adjustment gasket of each shock absorber (8) which is required to reach the theoretical height in the equipment mounting diagram, and manufacturing the adjustment gasket;
14 Diagonally installing the four-corner vibration damper (8) of the equipment, not fastening bolts, and fastening the bolts after the four-corner vibration damper (8) is installed in place;
15 Damper (8) mounting surface clearance control: the clearance between the contact bottom surface of the shock absorber (8) and the mounting surface of the base is controlled as follows: with a 0.05mm thick feeler, no 2/3 of the circumference of the contact surface perimeter should be inserted, and the insertable portion should be loose, its insertion depth should not exceed 15mm;
the gap limit value between the contact top surface and the adjusting washer, and between the adjusting washer and the machine foot of the equipment is as follows: with a 0.05mm gauge, the circumference of the adjusting pad should not be inserted by 2/3, and the insertable portion should be loose, and its insertion depth should not exceed 1/3 of its radius;
16 After the equipment is installed, the vibration isolation effect of the vibration absorber (8) is measured.
2. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
the four sides of the base (4) are uniformly provided with upright posts (7), racks are arranged on the upright posts (7), movable cross beams (3) penetrate through the upright posts (7), a dynamic loading mechanism (1) penetrates through the movable cross beams (3), force sensors (2) are arranged below force shafts (21) at the bottoms of the dynamic loading mechanism (1), guide posts (5) fixed on the base (4) symmetrically penetrate through the two sides of the movable cross beams (3), and the guide posts (5) and the upright posts (7) ensure the linear loading of the pressure of the dynamic loading mechanism (1); the lifting locking tool (6) drives the movable cross beam (3) to move up and down along the upright post (7) and has a safety interlocking function.
3. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
the dynamic loading mechanism (1) moves up and down in the hydraulic oil cylinder (20) in a way of driving the piston by the valve servo (16), so that the force shaft (21) is controlled to load the shock absorber (8), and the dynamic loading mechanism has higher transmission precision, loading control precision and speed control precision.
4. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
the vibration absorber (8) is connected with the clamp (10) through a bolt, an acceleration sensor II (18) and a displacement sensor (19) are arranged on a mass block at the top of the vibration absorber (8), and the vibration absorber (8) is fixed in a T-shaped groove of the base (4) through the clamp (10).
5. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
after the display control console (11) of the control measurement system is used for setting the height of the cross beam, the hydraulic motor (23) is controlled to drive the gear to move up and down along the rack by sending an instruction to the lifting control unit (22), so that the height of the movable cross beam (3) is adjusted, and the safety locking function is realized.
6. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
the display control console (11) of the control measurement system processes, sorts and calculates the test data information through the data analysis processing module, displays the dynamic stiffness curve in real time and stores the dynamic stiffness curve in a database;
after a display control console (11) of a control measurement system sets test parameters, the control instructions are sent to a main control unit (14), the main control unit (14) distributes the instructions to a hydraulic control unit (12), the hydraulic control unit (12) sends the instructions to a servo valve (16) to control a dynamic loading mechanism (1) to drive a power shaft (21) to realize loading, and at the moment, analog signals generated by a force sensor (2) and a displacement sensor (19) are transmitted to the main control unit (14) and then uploaded to the display control console (11);
after the display control console (11) of the control measurement system sets test parameters, the control instructions are sent to the total control unit (14), the total control unit (14) distributes the instructions to the lifting control unit (22), and the hydraulic motor (23) is controlled to drive the gear to move up and down along the rack, so that the height of the movable cross beam (3) is adjusted.
7. The method for testing and installing the dynamic stiffness of the rubber shock absorber according to claim 1, wherein the method comprises the following steps:
the hydraulic system starts the hydraulic control unit (12), the hydraulic control unit (12) sends an instruction to the servo valve (16), the hydraulic oil pump (13) pressurizes the accumulator (15), and the pressure for driving the dynamic loading mechanism (1) is maintained.
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| CN114778047B (en) * | 2022-06-17 | 2022-09-02 | 中国飞机强度研究所 | Dynamic stiffness and consistency testing device for airplane vibration damping component |
| CN114778048B (en) * | 2022-06-17 | 2022-09-02 | 中国飞机强度研究所 | Dynamic stiffness and consistency test method for airplane vibration damping component |
| CN115839888B (en) * | 2022-07-27 | 2023-12-12 | 扬州福克斯减震器有限公司 | Spring valve system shock absorber reliability selective inspection device |
| CN115750679A (en) * | 2023-01-10 | 2023-03-07 | 西安航弓机电科技有限公司 | Vibration absorber for turboprop engine and performance detection method thereof |
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