CN113218605A - Movable ultralow-vibration large-scale equipment test platform - Google Patents

Movable ultralow-vibration large-scale equipment test platform Download PDF

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CN113218605A
CN113218605A CN202110377701.7A CN202110377701A CN113218605A CN 113218605 A CN113218605 A CN 113218605A CN 202110377701 A CN202110377701 A CN 202110377701A CN 113218605 A CN113218605 A CN 113218605A
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vibration
platform
equipment
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test platform
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CN113218605B (en
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鲁帆
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Institute of Acoustics CAS
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/025—Measuring arrangements

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Abstract

The invention discloses a movable ultralow-vibration large-scale equipment test platform, which comprises: the device comprises a traction rod, a wheel type bracket, a middle-layer mounting frame, an upper-layer vibration damping mounting platform and two balancing weights; the middle-layer mounting frame is arranged on the wheel type bracket, the upper-layer vibration reduction mounting platform is arranged in the middle of the middle-layer mounting frame, two balancing weights are respectively arranged on two sides of the middle-layer mounting frame, and the tested equipment is arranged on the upper-layer vibration reduction mounting platform; the traction rod and the wheel type bracket can realize the movement of the test platform. The test platform can realize the noise and vibration test of the ultra-low vibration large-scale equipment, can meet the requirement of the large-scale equipment on ultra-low background vibration during the vibration test, and effectively isolates vibration interference; the device can be suitable for vibration test application of equipment with the maximum weight of 50 tons, and can be flexibly moved according to the requirements of a test site; the effective low-frequency cut-off frequency and the installation position can be adjusted according to the weight and the size of the test equipment.

Description

Movable ultralow-vibration large-scale equipment test platform
Technical Field
The invention relates to the field of noise and vibration testing, in particular to a movable ultra-low vibration large-scale equipment testing platform.
Background
At present, a platform for performing vibration testing on low-vibration-level equipment needs to be realized in a special laboratory environment in cooperation with foundation civil engineering, a fixed vibration isolation device and the like, and once the construction is completed, the position for performing the test and the size and the quality of a test object are solidified. Although such vibration test platforms have excellent environmental vibration isolation properties, they are only suitable for use with specific test subjects in a stationary laboratory. It is obvious that there is no feasibility for large equipment or structures that require field testing.
Disclosure of Invention
The purpose of the invention is as follows: the method provides a solution for vibration testing of ultra-low vibration large-scale equipment in a field environment, and reduces the interference of background vibration on the vibration testing of the equipment to be tested.
In order to achieve the above object, the present invention provides a movable ultra-low vibration large-scale equipment testing platform, which comprises: the device comprises a traction rod, a wheel type bracket, a middle-layer mounting frame, an upper-layer vibration damping mounting platform and two balancing weights; the middle-layer mounting frame is arranged on the wheel type bracket, the upper-layer vibration reduction mounting platform is arranged in the middle of the middle-layer mounting frame, two balancing weights are respectively arranged on two sides of the middle-layer mounting frame, and the tested equipment is arranged on the upper-layer vibration reduction mounting platform; the traction rod and the wheel type bracket can realize the movement of the test platform.
As an improvement of the device, the wheeled bracket adopts a 4-bridge 8-airbag suspension bracket; the method comprises the following steps: 16 inflatable wheels, and wheel bridge air bags are respectively hung on two sides of each axle.
As an improvement of the device, when the wheel type bracket reaches a set position under the action of the draw bar, the whole test platform can be supported by the wheels of the test platform, and 4 rigid auxiliary support legs are suspended on the ground at 10mm positions for preventing the sudden failure of the suspension air bag.
As an improvement of the device, the middle-layer mounting frame is made of a steel structure.
As an improvement of the above device, the upper vibration damping mounting platform comprises two moving platforms in horizontal direction, each moving platform comprises: the vibration isolation support comprises an I-shaped support frame, four vibration isolation support air bags and an I-shaped equipment mounting frame; the four vibration isolation supporting air bags are arranged on the I-shaped supporting frame, the I-shaped equipment mounting frame is arranged on the four vibration isolation supporting air bags, and the tested equipment is placed on the I-shaped equipment mounting frame.
As an improvement of the device, the determination process of the mass of the balancing weight and the comprehensive rigidity of the vibration isolation supporting air bag is as follows:
the quality of the tested equipment is m1The mass of the two balancing weights is Deltam, and the sum of the mass of the middle-layer mounting frame, the mass of the wheel type bracket and the mass of the two balancing weights is m2，k1Supporting the combined stiffness of the air-bags, k, for vibration isolation2Is the support stiffness of the wheeled carriage;
first natural frequency omega of test platformp1Comprises the following steps:
Figure BDA0003011892940000021
second natural frequency omega of test platformp2Comprises the following steps:
Figure BDA0003011892940000022
the selection principle of the mass of the balancing weight and the comprehensive rigidity of the vibration isolation support air bag is as follows: the first natural frequency and the second natural frequency are close to each other as much as possible and are far away from the excitation frequency of the tested device;
according to the principle, the comprehensive rigidity of the vibration isolation supporting air bag is adjusted by adjusting the air pressure of the vibration isolation supporting air bag, and the first natural frequency omega is adjustedp1(iii) adjustment of (c); according to the mass m of the device under test1Adjusting the mass Deltam of the balancing weight to realize the second natural frequency omegap2The test platform can achieve the optimal vibration isolation effect by adjusting.
The invention has the advantages that:
the test platform can realize the noise and vibration test of the ultra-low vibration large-scale equipment, can meet the requirement of the large-scale equipment on ultra-low background vibration during the vibration test, and effectively isolates vibration interference; the device can be suitable for vibration test application of equipment with the maximum weight of 50 tons, and can be flexibly moved according to the requirements of a test site; the effective low-frequency cut-off frequency and the installation position can be adjusted according to the weight and the size of the test equipment.
Drawings
FIG. 1 is a block diagram of a mobile ultra low vibration large scale device test platform of the present invention;
FIG. 2 is a schematic view of a two-degree-of-freedom double-layer vibration isolation system with a vibration isolation platform simplified to be undamped;
FIG. 3 is a graphical representation of the relationship between inflation pressure and stiffness for a single bladder.
The attached drawings are as follows:
1. wheel type bracket 2, middle layer mounting frame 3 and balancing weight
4. Upper layer damping mounting platform 5, I-shaped support frame 6, vibration isolation support airbag
7. I-shaped equipment mounting rack 8, tested equipment 9 and draw bar
10. Auxiliary supporting leg
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the invention provides a movable ultra-low vibration large-scale equipment test platform, which comprises a 4-bridge 8-airbag suspension type wheeled bracket 1, a middle-layer mounting frame 2, an upper-layer vibration reduction mounting platform 4 and two balancing weights 3; middle level installation frame 2 sets up on wheeled bracket 1, and upper strata damping mounting platform 4 sets up the intermediate position at middle level installation frame 2, and a balancing weight 3 is placed respectively to the both sides of middle level installation frame 2. The middle layer mounting frame 2 adopts a steel structure.
The wheeled carriage 1 includes: 16 inflatable wheels and a traction rod 9, wherein a wheel axle air bag is respectively suspended at two sides of each axle; when the wheel type bracket reaches a set position, the whole test platform is fixed through the wheels, and the auxiliary support leg 10 is suspended on the ground for 10mm for emergency support. The drawbar 9 is used to move the entire test platform. The wheel type bracket and the traction rod can realize flexible arrangement and movement of the platform in a field environment.
Flexible installation of equipment objects with the length of 7m and the width of 2.5m or less is realized through a plurality of groups of prefabricated interfaces of the middle-layer installation frame 2;
upper damping mounting platform 4 includes two moving platforms, and every moving platform includes: the vibration isolation support comprises an I-shaped support frame 5, four vibration isolation support air bags 6 and an I-shaped equipment mounting frame 7; the four vibration isolation supporting airbags 6 are arranged on the I-shaped supporting frame 5, and the I-shaped equipment mounting frame 7 is arranged on the four vibration isolation supporting airbags 6; the device under test 8 is placed on the i-shaped device mounting frame 7.
The whole platform realizes efficient isolation of background vibration transmitted through a foundation in a field environment by three vibration reduction measures of an inflatable wheel, a wheel axle air bag suspension and a vibration isolation supporting air bag; the optimal effect of vibration isolation is realized by adjusting the pressure and the working height of a plurality of groups of air bags and loading different counterweight module schemes according to the mass of a test object, and the requirements of vibration tests on equipment with different masses within 50 tons are met.
The integral platform is arranged on the flat and solid ground foundation, and the upper-layer equipment is firmly installed. The gravity center of the equipment is distributed as close to the geometric center of the platform as possible; the pressure of each air bag is adjusted according to the mass of the test equipment, so that the optimal vibration isolation height is achieved; and calculating the mass of the counterweight required to be arranged on the middle-layer steel structure according to the mass of the test equipment and the main working frequency, and realizing the optimal vibration isolation effect.
As shown in FIG. 2, the vibration isolation platform is simplified into a two-degree-of-freedom double-layer vibration isolation system without damping, wherein the mass of the device to be tested is m1The mass of the two balancing weights is Deltam, and the sum of the mass of the middle-layer mounting frame, the mass of the wheel type bracket and the mass of the two balancing weights is m2，k1Supporting the combined stiffness of the air-bags, k, for vibration isolation2Is the support stiffness of the wheeled carriage;
the system equation of motion is:
Figure BDA0003011892940000041
Figure BDA0003011892940000042
note the book
Figure BDA0003011892940000043
Omega is the excitation frequency of the test equipment and can be derivedThe system has a displacement transmission rate of
Figure BDA0003011892940000044
In order to improve the vibration isolation effect, the two natural frequencies of the double-layer vibration isolation system should be as close to and far away from the excitation frequency omega of the test equipment as possible, so that the two natural frequencies can be determined according to the mass m of the tested equipment1Adjusting mass Δ m of clump weight to adjust m2Can realize the pair omegap2Adjusting the air pressure k of the vibration isolation supporting air bag1To adjust can realize the pair omegap1The vibration isolation platform can achieve the optimal vibration isolation effect by adjusting. The corresponding situation of inflation pressure and stiffness of the individual bladders is shown in fig. 3.
Example (c):
the test of a certain ultra-low vibration energy cabin has low requirement on background vibration, and the test requirement of the general test is difficult to meet. The energy cabin is a large cabin body device with the size of 4m, the diameter of 4m and the weight of 8 tons, and the operation conditions of an air passage, a water passage and electrical connection need to be met simultaneously in the operation process of the large cabin body device, and the operation conditions are difficult to meet in a standard test room, so that the large cabin body device can only be tested on a workshop site. Because the field environment is more complicated than a laboratory, the interference of various other industrial equipment and production activities exists, if the equipment is simply placed in a test workshop for testing, the testing requirements can not be met, and effective testing data can not be obtained. By the test platform, the problem that the ultra-low vibration large equipment can be tested under the field environment is effectively solved, the background vibration is reduced to 48dB from 75dB, and the test of an ultra-low vibration level signal is met.
Finally, it should be noted that the above examples are only intended to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A movable ultra-low vibration large scale equipment test platform, the test platform comprising: the device comprises a traction rod, a wheel type bracket, a middle-layer mounting frame, an upper-layer vibration damping mounting platform and two balancing weights; the middle-layer mounting frame is arranged on the wheel type bracket, the upper-layer vibration reduction mounting platform is arranged in the middle of the middle-layer mounting frame, two balancing weights are respectively arranged on two sides of the middle-layer mounting frame, and the tested equipment is arranged on the upper-layer vibration reduction mounting platform; the traction rod and the wheel type bracket can realize the movement of the test platform.
2. The movable ultra-low vibration large scale equipment testing platform of claim 1, wherein the wheeled carrier is a 4-bridge 8-airbag suspension carrier; the method comprises the following steps: 16 inflatable wheels, and wheel bridge air bags are respectively hung on two sides of each axle.
3. The movable ultra-low vibration large equipment test platform as claimed in claim 1, wherein when the wheeled bracket reaches the set position under the action of the draw bar, the whole test platform can be supported by the wheels of the test platform, and 4 rigid auxiliary support legs are suspended on the ground at 10mm positions for preventing the sudden failure of the suspension air bag.
4. The movable ultra-low vibration large equipment test platform as claimed in claim 1, wherein the middle layer mounting frame is made of steel structure.
5. A movable ultra-low vibration large scale equipment test platform according to claim 1, wherein the upper vibration reduction mounting platform comprises two horizontally oriented moving platforms, each moving platform comprising: the vibration isolation support comprises an I-shaped support frame, an I-shaped equipment mounting frame and four vibration isolation support air bags; the four vibration isolation supporting air bags are arranged on the I-shaped supporting frame, and the I-shaped equipment mounting frame is arranged on the four vibration isolation supporting air bags; the tested equipment is placed on the I-shaped equipment mounting frame.
6. The movable ultra-low vibration large-scale equipment test platform according to claim 5, wherein the determination process of the mass of the balancing weight and the comprehensive rigidity of the vibration isolation supporting air bag is as follows:
the quality of the tested equipment is m1The mass of the two balancing weights is Deltam, and the sum of the mass of the middle-layer mounting frame, the mass of the wheel type bracket and the mass of the two balancing weights is m2，k1Supporting the combined stiffness of the air-bags, k, for vibration isolation2Is the support stiffness of the wheeled carriage;
first natural frequency omega of test platformp1Comprises the following steps:
Figure FDA0003011892930000011
second natural frequency omega of test platformp2Comprises the following steps:
Figure FDA0003011892930000012
the selection principle of the mass of the balancing weight and the comprehensive rigidity of the vibration isolation support air bag is as follows: the first natural frequency and the second natural frequency are close to each other as much as possible and are far away from the excitation frequency of the tested device;
according to the principle, the comprehensive rigidity of the vibration isolation supporting air bag is adjusted by adjusting the air pressure of the vibration isolation supporting air bag, and the first natural frequency omega is adjustedp1(iii) adjustment of (c); according to the mass m of the device under test1Adjusting the mass Deltam of the balancing weight to realize the second natural frequency omegap2The test platform can achieve the optimal vibration isolation effect by adjusting.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201176114Y (en) * 2007-07-19 2009-01-07 上海途美贸易有限公司 Air suspension system for passenger car
KR20090100051A (en) * 2008-03-19 2009-09-23 대윤계기산업 주식회사 The table vibrator improve the mobility and square characteristic
CN204008165U (en) * 2014-06-17 2014-12-10 江苏省镇江船厂（集团）有限公司 Watercraft engine room subsidiary engine equipment vibration isolation analogue means
CN106596016A (en) * 2016-12-07 2017-04-26 上海卫星装备研究所 Spacecraft ultra-quiet environment simulating and testing system
CN108167363A (en) * 2017-12-25 2018-06-15 山东大学 A kind of positive and negative Stiffness low frequency vibration isolation device of two-freedom
CN108287049A (en) * 2018-01-29 2018-07-17 北京卫星环境工程研究所 Spaceborne flywheel disturbs the experimental rig for power test of shaking under vacuum environment
CN108458040A (en) * 2018-02-05 2018-08-28 中国人民解放军海军工程大学 A kind of adjustable double-layer vibration damping module of integrated form
CN108716519A (en) * 2018-07-02 2018-10-30 国网湖南省电力有限公司 A kind of variable element dynamic vibration absorber

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201176114Y (en) * 2007-07-19 2009-01-07 上海途美贸易有限公司 Air suspension system for passenger car
KR20090100051A (en) * 2008-03-19 2009-09-23 대윤계기산업 주식회사 The table vibrator improve the mobility and square characteristic
CN204008165U (en) * 2014-06-17 2014-12-10 江苏省镇江船厂（集团）有限公司 Watercraft engine room subsidiary engine equipment vibration isolation analogue means
CN106596016A (en) * 2016-12-07 2017-04-26 上海卫星装备研究所 Spacecraft ultra-quiet environment simulating and testing system
CN108167363A (en) * 2017-12-25 2018-06-15 山东大学 A kind of positive and negative Stiffness low frequency vibration isolation device of two-freedom
CN108287049A (en) * 2018-01-29 2018-07-17 北京卫星环境工程研究所 Spaceborne flywheel disturbs the experimental rig for power test of shaking under vacuum environment
CN108458040A (en) * 2018-02-05 2018-08-28 中国人民解放军海军工程大学 A kind of adjustable double-layer vibration damping module of integrated form
CN108716519A (en) * 2018-07-02 2018-10-30 国网湖南省电力有限公司 A kind of variable element dynamic vibration absorber

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