CN104483085B - Design method of special test base for force transmissibility of vibration equipment - Google Patents
Design method of special test base for force transmissibility of vibration equipment Download PDFInfo
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- CN104483085B CN104483085B CN201410814108.4A CN201410814108A CN104483085B CN 104483085 B CN104483085 B CN 104483085B CN 201410814108 A CN201410814108 A CN 201410814108A CN 104483085 B CN104483085 B CN 104483085B
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Abstract
The invention relates to a design method of a special test base for force transmissibility of vibration equipment. The design method comprises the following steps: by taking base structure parameters as design variables, and the impedance of the base which is equal to the mechanical resistance of the vibration equipment as an optimization goal, carrying out optimum analysis on the base, selecting a genetic algorithm as an optimization method and finding out the optimal base structure parameter, so that a minimum difference between the vibration level difference and the force transmissibility is achieved; establishing an actual base model according to the base structure parameters obtained by optimization; carrying out vibration test and validating the vibration isolation effect of the test base. The design method is a simple, efficient and reliable base design method. Through the method, the corresponding special test base is obtained by design, which is used for accurate evaluation on equipment vibration and system vibration isolation effect.
Description
Technical field
The present invention relates to a kind of test equipment designs field, more particularly to a kind of vibratory equipment transmissibility special test base
Seat method for designing.
Background technology
The parameter of assessment plant equipment isolation mounting vibration isolating effect has transmissibility and vibration level drop.The definition of transmissibility
For, after plant equipment elasticity is installed, the vibration force suffered by foundation（The power output of plant equipment vibrating isolation system）With exciting
Ratio between power.For this vibrating isolation system, due to cannot the operationally produced exciting force of direct access equipment, therefore will
Vibration force at equipment under-chassis is taken as the input power of this vibrating isolation system.By the force transducer at each under-chassis measuring point, obtain this every
The input power of vibrating system；Simultaneously by the force transducer at each pedestal measuring point, the power output of this vibrating isolation system is obtained.It is real
Test as multimetering, transmissibility can be represented with the meansigma methodss of each measuring point,
；
The definition of vibration level drop is, after plant equipment elasticity is installed, at the vibratory response and equipment under-chassis on foundation
Vibratory response ratio.Vibration level drop represented using acceleration vibration level drop, is tested as multimetering, and vibration level drop is available each
The meansigma methodss of measuring point represent,
It is the total vibration level logarithmic mean value of acceleration of each measuring point of equipment under-chassis in formula,Adding for each measuring point of face plate of foundation
The total vibration level logarithmic mean value of speed, its expression formula sees below formula.
In formula,For equipment under-chassisiAcceleration vibration level at measuring point,For face plate of foundationiAdding at measuring point
Speed vibration level,For measuring point sum.
The vibration level drop between vibroshock upper and lower side is commonly used in engineering（Using AL Acceleration Level）To represent this vibrating isolation system
Vibration isolating effect.But the index has certain defect, i.e., in the case of the determination of vibration isolator characteristic, the impedance of foundation
Characteristic has a huge impact to vibration level drop, erroneous judgement may be produced in some cases, it is impossible to objectively reflect vibration isolating effect.
Therefore vibration isolating effect is characterized by transmissibility is only the more rational practice.But compared to vibration level drop, test this every
The transmissibility of vibrating system needs that force transducer is connected in vibrating isolation system, is difficult to realize when this is measured at the scene.And it is another
Aspect insertion force transducer also can produce impact to this vibrating isolation system characteristic.Therefore, if can come equivalent using vibration level drop
Transmissibility is obtained, the vibration isolating effect of vibrating isolation system can will be preferably characterized.But in fact, the two evaluation indexes are not etc.
Valency, it is widely different under normal conditions, only when pedestal meets some requirements, and possesses specified impedance, vibration level drop and power
Just there is equivalent relation between transport the two evaluation indexes.The present invention is directed to the problem, there is provided a kind of design of pedestal
Method.
The content of the invention
The present invention be directed to the impedance operator of pedestal affects big problem to the vibration level drop and transmissibility of isolation mounting,
Propose a kind of vibratory equipment transmissibility special test pedestal method for designing, it is ensured that foundation impedance is to elastic system vibration isolation
The impact of effect and vibration equipment is preferably minimized limit, so as to realize the accurate evaluation of vibration equipment and system isolation effect.
The technical scheme is that：A kind of vibratory equipment transmissibility special test pedestal method for designing, specifically includes
Following steps：
1）Installed according to the weight and under-chassis of vibratory equipment and counted out, select vibration isolator, by experimental test or imitative
True simulation, analyzes the dynamicss of vibratory equipment and vibration isolator, respectively obtains between each under-chassis junction point of vibratory equipment
And the acceleration admittance matrix between the upper and lower mount point of vibration isolator；
2）According to the geometry and dynamic characteristic of vibratory equipment, the initial model of pedestal is set up, select base construction
Parameter, using analytic method or Finite Element Method the parameterized model of pedestal is set up, and obtains pedestal each vibration isolator connection
Acceleration admittance matrix between point；
3）By the admittance data of vibratory equipment, vibration isolator and pedestal, impedance matrix is obtained, used respectively、With
The mechanical impedance of vibratory equipment, vibration isolator and pedestal is represented, vibration isolator is solved：
The difference of vibration level drop and transport is：
,
Due to vibration isolator impedanceZ I Much smaller than the impedance of equipment and pedestalZ M WithZ F , then above formula can further be simplified to：
WithDifference is less, and vibration isolating effect effect is better；
4）With step 2）Middle base construction parameter is design variable, is equal to vibratory equipment mechanical impedance with the impedance of pedestal
Optimization aim, optimality analysis is carried out to pedestal, selects genetic algorithm as optimization method, finds the base construction ginseng of optimum
Number so that the difference of vibration level drop and transmissibility is minimum；
5）According to the base construction parameter that optimization is obtained, actual base model is set up；
6）Carry out vibration-testing, validation test pedestal vibration isolating effect.
The step 1）Middle vibratory equipment test can be at resilient suspension by suspension cable, by Hammering Test,
Input admittance and transfer admittance between each under-chassis measuring point of test vibration equipment, so as to form the acceleration admittance square of vibratory equipment
Battle array；The dynamicss of vibration isolator can be measured by the test of impedance platform.
The beneficial effects of the present invention is：Vibratory equipment transmissibility special test pedestal method for designing of the present invention, is one
Plant simple, efficient, reliable pedestal method for designing.With it, design obtains corresponding special test pedestal, for equipment
Vibration and the accurate evaluation of system isolation effect.
Description of the drawings
Fig. 1 is the illustraton of model of embodiment of the present invention low noise water pump；
Fig. 2 is the acceleration admittance curve chart between embodiment of the present invention equipment under-chassis vibration isolator junction point；
Fig. 3 is embodiment of the present invention special test pedestal model schematic diagram；
Fig. 4 is embodiment of the present invention pedestal after optimization design, vibration level drop and the transmissibility schematic diagram of system.
Specific embodiment
The present invention carries out pedestal design according to the kinetics admittance characteristic of equipment, and by optimization method optimal base is found
Holder structure parameter so that impact of the foundation impedance to elastic system vibration isolating effect and vibration equipment is preferably minimized limit, tool
The method of body is as follows：
（1）Installed according to the weight and under-chassis of targeted vibratory equipment and counted out, select suitable vibration isolator.Pass through
The dynamicss of experimental test or analogue simulation, analytical equipment and vibration isolator.Respectively obtain each under-chassis connection of equipment
Acceleration admittance matrix between point and between the upper and lower mount point of vibration isolator.
（2）According to the geometry and dynamic characteristic of vibratory equipment, the initial model of pedestal is set up.Select pedestal suitable
Structural parameters, set up the parameterized model of pedestal using analytic method or Finite Element Method, and obtain pedestal each vibration isolation
Acceleration admittance matrix between device junction point.Can pass through to change the dynamicss that design parameter adjusts pedestal.
（3）By the admittance data of vibratory equipment, vibration isolator and pedestal, their impedance matrix can be obtained, be used respectively、WithThe mechanical impedance of unit, vibration isolator and pedestal is represented, so as to solve to whole vibrating isolation system.
Now the transmissibility of vibrating isolation system is：
Vibration level drop is：
In view of vibration isolator impedanceZ I Much smaller than the impedance of equipment and pedestalZ M WithZ F , the difference of vibration level drop and transport
Can be reduced to：
From above formula, the difference between vibration level drop and transmissibility can be by the impedance of equipment and pedestal come table
Show, when both are equal, transmissibility can be replaced to characterize the vibration isolating effect of vibrating isolation system by vibration level drop.
（4）Based on the above, design requirement could be met, need pedestal to possess special with test equipment identical kinetics
Property.With（2）In select structural parameters be design variable, the impedance operator with pedestal as optimization aim, in certain constraint bar
Under part, optimality analysis is carried out to pedestal.Because the design variable of the Optimized model is more, and object function and design variable are simultaneously
Non- is gradient relation, therefore selects genetic algorithm as optimization method.Find the base construction parameter of optimum so that vibration level drop
And the difference of transmissibility is minimum.
（5）According to the base construction parameter that optimization is obtained, actual base model is set up.
（6）Vibration-testing is carried out, the Test bench that this method design is obtained is verified, can be to vibration equipment and vibration isolation
Effect makes accurately evaluation.
According to the method for designing of above-mentioned vibratory equipment special test pedestal, for low noise water pump, its special test is designed
Pedestal, and with its effect of experimental verification.
The model schematic of low noise water pump is as shown in figure 1, figure midpoint 1～4 is the vibration isolator junction point of under-chassis.By outstanding
Rope makes water pump in resilient suspension, and simulation is free --- free boundary condition.By Hammering Test, each under-chassis of test water pump
Input admittance and transfer admittance between measuring point, so as to form the acceleration admittance matrix of water pump（Equipment mechanical admittance curves are shown in Fig. 2）.
And the dynamicss of vibration isolator can be measured by the test of impedance platform.
Its impedance matrix is obtained according to equipment dynamic admittance characteristic, and according to its geometry, designs corresponding initial
Pedestal model（See Fig. 3）.Pedestal model is made up of bracing frame 31 and the two parts of base plate 32（Add in sequence number Fig. 3）.Base plate is one
Rectangular plates with varying thickness, to produce different Mass Distribution.Bracing frame is located at the center of base, and its construction have references to equipment
Under-chassis connecting plate（In FIG 10）, in the surrounding of bracing frame 31 reinforcement has been respectively arranged.The thickness of bracing frame 31 is selected respectively
The thickness of slab of degree and the zones of different of base plate 32 is parameter, and using Finite Element Method the kinetic model of pedestal is set up, and is calculated
To the acceleration impedance matrix between vibration isolator junction point.
According to method（4）In Optimized model, optimized design is carried out to pedestal.Using the pedestal obtained after optimization, build
Vertical vibrating isolation system model, and solved, respectively obtain vibration level drop and transmissibility（See Fig. 4）, so as to demonstrate the design
The effectiveness and practicality of method.
Claims (2)
1. a kind of vibratory equipment transmissibility special test pedestal method for designing, it is characterised in that specifically include following steps：
1) installed according to the weight and under-chassis of vibratory equipment and counted out, select vibration isolator, by experimental test or emulation mould
Intend, analyze the dynamicss of vibratory equipment and vibration isolator, respectively obtain between each under-chassis junction point of vibratory equipment and
Acceleration admittance matrix between the upper and lower mount point of vibration isolator；
2) according to the geometry and dynamic characteristic of vibratory equipment, the initial model of pedestal is set up, selects base construction parameter,
The parameterized model of pedestal is set up using analytic method or Finite Element Method, and obtain between pedestal each vibration isolator junction point
Acceleration admittance matrix；
3) by the admittance data of vibratory equipment, vibration isolator and pedestal, impedance matrix is obtained, Z is used respectivelyM、ZIAnd ZFRepresent vibration
The mechanical impedance of equipment, vibration isolator and pedestal, solves to vibration isolator：
The difference of vibration level drop and transmissibility is：
Due to mechanical impedance Z of vibration isolatorIMuch smaller than vibratory equipment and mechanical impedance Z of pedestalMAnd ZF, then above formula is further simple
Chemical conversion：
ZMAnd ZFDifference is less, and vibration isolating effect is better；
4) with step 2) in base construction parameter as design variable, with the mechanical impedance of pedestal be equal to vibratory equipment mechanical impedance
For optimization aim, optimality analysis is carried out to pedestal, select genetic algorithm as optimization method, find the base construction ginseng of optimum
Number so that the difference of vibration level drop and transmissibility is minimum；
5) the base construction parameter obtained according to optimization, sets up actual base model；
6) vibration-testing, validation test pedestal vibration isolating effect are carried out.
2. vibratory equipment transmissibility special test pedestal method for designing according to claim 1, it is characterised in that the step
It is rapid 1) in vibratory equipment test resilient suspension is at by suspension cable, by Hammering Test, each machine of test vibration equipment
Input admittance and transfer admittance between foot measuring point, so as to form the acceleration admittance matrix of vibratory equipment；The power of vibration isolator
Learn characteristic to measure by the test of impedance platform.
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| CN110610032B (en) * | 2019-08-26 | 2023-04-07 | 广东博智林机器人有限公司 | Tire optimization method and device for transportation equipment, electronic equipment and storage medium |
Citations (3)
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| JP3644292B2 (en) * | 1999-03-15 | 2005-04-27 | 株式会社日立製作所 | Structure vibration test apparatus and vibration test method |
| CN103062322A (en) * | 2012-11-29 | 2013-04-24 | 西安建筑科技大学 | Spring vibration reduction foundation design method of medium speed coal mill |
| CN103808499A (en) * | 2014-01-21 | 2014-05-21 | 江苏科技大学 | Method and device for testing dynamic stiffness of vibration isolator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3644292B2 (en) * | 1999-03-15 | 2005-04-27 | 株式会社日立製作所 | Structure vibration test apparatus and vibration test method |
| CN103062322A (en) * | 2012-11-29 | 2013-04-24 | 西安建筑科技大学 | Spring vibration reduction foundation design method of medium speed coal mill |
| CN103808499A (en) * | 2014-01-21 | 2014-05-21 | 江苏科技大学 | Method and device for testing dynamic stiffness of vibration isolator |
Non-Patent Citations (2)
| Title |
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| 功率流隔振效率评价指标及其与振级落差的关系;霍睿等;《中国造船》;20070930;第48卷(第3期);第86－91页 * |
| 复合材料面板对筒型基座整体抑振机制影响规律研究;梅志远等;《振动与冲击》;20120515;第31卷(第9期);第149－153页 * |
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