CN105258784A - Automatic pulse excitation modal parameter identification method and device - Google Patents
Automatic pulse excitation modal parameter identification method and device Download PDFInfo
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- CN105258784A CN105258784A CN201510740448.1A CN201510740448A CN105258784A CN 105258784 A CN105258784 A CN 105258784A CN 201510740448 A CN201510740448 A CN 201510740448A CN 105258784 A CN105258784 A CN 105258784A
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Abstract
The invention relates to an automatic pulse excitation modal parameter identification method and device, and belongs to the field of vibration testing instruments. The method achieves the automatic vibration excitation of a tested part through an automatic vibration excitation apparatus, and achieves the control of a vibration excitation force and the collection of a tested signal through a controller, a power amplifier, and a multifunctional data collection card. The device mainly comprises an impact head, a force sensor, a cover body, a spring supporting assembly, a push rod, a yoke, an excitation coil, an iron core, and a pedestal. After the coil is electrified, the coil can drive the iron core to come out and generate a vibration excitation force for the tested part. The force sensor can feed back the vibration excitation force withstood by the tested part, and can achieve the adjustment of the vibration excitation force through adjusting the amplitude and width of a pulse signal. The device solves problems, caused by human factors, of double hit, overloading and poor repeatability of a conventional hand-held type vibration excitation hammer, is compact in structure, is small in size, is high in automation degree, is high in repeatability, is easy to operate, and can improve the precision and efficiency of a modal test.
Description
Technical field
The present invention relates to a kind of autompulse excitation Modal Parameters Identification and device, belong to vibration testing instrument field.
Background technology
Mould measurement is the common method obtaining system dynamic characteristic, is widely used in Engineering Vibration field.One of its key issue to obtain frequency response function data accurately, only has on this basis, accurately could identify modal parameter.
Traditional mechanical system frequency response function test, pulse excitation device is hand-held exciting hammer, and because power hammer knocks the size of test specimen impulsive force, the movement velocity by tup quality and when knocking determined, therefore hammering method is easily subject to the impact of human factor, the bad control of force size.Exert a force excessive, easily produce overload; Exert a force too small, each rank mode can not be evoked again.In the process of knocking, because the paired pulses duration holds bad, easily occur double-clicking phenomenon, need repeatedly to knock.Further, in test process, can not ensure the dynamics of at every turn knocking and direction completely the same, therefore repeatable poor.These drawbacks all cause that existing mode experiment efficiency is low, precision is difficult to ensure.
Summary of the invention
The object of the invention is to the deficiency overcoming the artificial exciting of tradition, solve the unreliable problem of data because human factor causes.Provide one and automatically can control amplitude of exciting force, realize the electromagnetic type pulse excitation device of automatic exciting action.And based on this device, propose a kind of autompulse excitation Modal Parameters Identification, realize the robotization of mould measurement, digitizing and high efficiency.
Technical scheme of the present invention is as follows:
A kind of autompulse excitation mode parameter identification device, driven by signal generator and power amplifier, mainly comprise impact head 1, force snesor 2, cover body 3, spring-loaded assembly 4, push rod 5, yoke 6, field coil 7, iron core 8 and base 9, as shown in Figure 1.Be installed on yoke 6 through spring-loaded assembly 4 after impact head 1, force snesor 2, push rod 5, iron core 8 are interconnected, yoke 6 is installed on base, and cover body 3 is installed on yoke 6 side.It is inner that described field coil 7 is fixed on yoke 6, and yoke 6 is full-enclosed structure; Be supported between yoke 6 center pit by spring-loaded assembly 4 after iron core 8 and push rod 5 are connected, the through hole that one end of push rod 5 is offered by cover body 3 top leans out, and is connected by screw force snesor 2 and impact head 1; One end of iron core 8 is goed deep in vibrator.
The structure that vibrator cored 8 is deeply held also exists intensive leakage flux, and magnetic field is radial for coil, so field coil 7 can be subject to axial electromagnetic force after being energized, because field coil 7 is fixing, so iron core 8 can be subject to the exciting force of rightabout electromagnetic force generation to measured piece.Wherein spring-loaded assembly 4 supporting and rebound effect, quality is light, good toughness.
A kind of autompulse excitation Modal Parameters Identification, the automatic exciting to measured piece is realized by autompulse exciting device, and be aided with controller, power amplifier and multifunctional data acquisition card module, realize the control to exciting force and the collection to measured signal, the theory diagram of the method as shown in Figure 2.Pulse signal is sent by controller, after multi-function data acquisition card DA changes, simulation exports power amplifier to, autompulse exciting device is exported to again after power amplifier amplifies, by regulating power amplifier gain, pulse signal amplitude or pulsewidth, the size of exciting force can be controlled, realize the automatic exciting to measured piece.Force signal can be shown to controller through capture card collection again, realizes the FEEDBACK CONTROL to exciting force size.Measured piece connects acceleration transducer, force signal and acceleration signal are collected in computing machine, through processing the frequency response function and the modal parameter that obtain measured piece further.
Controller is made up of the computing machine with Labview, and the control software design write with Labview is by changing the size of pulse amplitude and width adjusting exciting force.Power amplifier adopts silicon crystal high-power amplifying circuit, and the OCLC way of output, low frequency amplification performance is good.Also the size of exciting force is changed by the gain button of regulating power amplifier.
The present invention replaces people for knocking with from master drive, simple to operate, easily uses, can also repeatedly repeat by quick responsive excitation, replace people to complete repeated exciting, and exciting force size can be controlled, realize cutting tool for CNC machine axis system dynamic perfromance Real time auto measure.System eliminates the impact of human factor in measuring process well, makes measured value more accurate, thus obtains reliable lathe frequency response function to complete test rapid automatizedly.
Accompanying drawing illustrates:
Fig. 1 autompulse exciting device diagrammatic cross-section
Fig. 2 mould measurement system schematic
In figure:
1-impact head, 4-spring-loaded assembly, 7-field coil
2-force snesor, 5-push rod, 8-iron core
3-cover body, 6-yoke, 9-base
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
S1, be fixed in plane by electromagnetic exciter base 9 by screw, be arranged on by force snesor 2 between impact head 1 and vibrator, impact head and force snesor align with measured piece tested point and adjust reasonable clearance.
S2, connect controller, multi-function data acquisition card, power amplifier, autompulse exciting device and force snesor successively, then connect controller and power amplifier power supply, power amplifier gain is suitably heightened.Start control software design, regulate suitable pulse width, then the shock button clicked on front panel can realize the automatic exciting to measured piece.
After shock button on S3, click front panel, power amplifier will export specifies the pulse voltage of amplitude and pulsewidth to autompulse exciting device, autompulse exciting device drive coil obtain electric after produce magnetic field, magnetized by iron core, iron core is subject to the exciting force of electromagnetic force generation to measured piece.
Force signal can collect in computing machine through data collecting card by S4, the force snesor be arranged between impact head and push rod, according to the size of the power collected, can resonance-amplifier gain and pulse width further, realize the FEEDBACK CONTROL to impulsive force amplitude.
S5, on measured piece, connect acceleration transducer, force signal and acceleration signal are collected in computing machine, obtain frequency response function and the modal parameter of measured piece through process further.
Be more than a case study on implementation of the present invention, enforcement of the present invention is not limited thereto.
Claims (4)
1. an autompulse excitation mode parameter identification device, this device is driven by signal generator and power amplifier, it is characterized in that: mainly comprise impact head (1), force snesor (2), cover body (3), spring-loaded assembly (4), push rod (5), yoke (6), field coil (7), iron core (8), base (9); Be installed on yoke (6) through spring-loaded assembly (4) after impact head (1), force snesor (2), push rod (5), iron core (8) are interconnected, yoke (6) is installed on base, and cover body (3) is installed on yoke (6) side; It is inner that described field coil (7) is fixed on yoke (6), and yoke (6) is full-enclosed structure; Be supported between yoke (6) center pit by spring-loaded assembly (4) after iron core (8) and push rod (5) are connected, the through hole that one end of push rod (5) is offered by cover body (3) top leans out, and is connected by screw force snesor (2) and impact head (1); One end of iron core (8) is goed deep in vibrator;
The structure that vibrator cored (8) is deeply held also exists intensive leakage flux, and magnetic field is radial for coil, so axial electromagnetic force can be subject to after field coil (7) energising, because field coil (7) is fixing, so iron core (8) can be subject to the exciting force of rightabout electromagnetic force generation to measured piece; Wherein spring-loaded assembly (4) plays supporting and rebound effect, and quality is light, good toughness.
2. an autompulse excitation Modal Parameters Identification, it is characterized in that: realize the automatic exciting to measured piece by autompulse exciting device, and be aided with controller, power amplifier and multifunctional data acquisition card module, realize the control to exciting force and the collection to measured signal; Pulse signal is sent by controller, after multi-function data acquisition card DA changes, simulation exports power amplifier to, autompulse exciting device is exported to again after power amplifier amplifies, by regulating power amplifier gain, pulse signal amplitude or pulsewidth, the size of exciting force can be controlled, realize the automatic exciting to measured piece; Force signal can be shown to controller through capture card collection again, realizes the FEEDBACK CONTROL to exciting force size; Measured piece connects acceleration transducer, force signal and acceleration signal are collected in computing machine, through processing the frequency response function and the modal parameter that obtain measured piece further.
3. a kind of autompulse excitation Modal Parameters Identification according to claim 2, it is characterized in that: controller is made up of the computing machine with Labview, the control software design write with Labview is by changing the size of pulse amplitude and width adjusting exciting force; Power amplifier adopts silicon crystal high-power amplifying circuit, the OCLC way of output, and low frequency amplification performance is good; Also the size of exciting force is changed by the gain button of regulating power amplifier.
4. a kind of autompulse excitation Modal Parameters Identification according to claim 2, is characterized in that:
S1, electromagnetic exciter base (9) is fixed in plane by screw, be arranged on by force snesor (2) between impact head (1) and vibrator, impact head and force snesor align with measured piece tested point and adjust reasonable clearance;
S2, connect controller, multi-function data acquisition card, power amplifier, autompulse exciting device and force snesor successively, then connect controller and power amplifier power supply, power amplifier gain is suitably heightened; Start control software design, regulate suitable pulse width, then the shock button clicked on front panel can realize the automatic exciting to measured piece;
After shock button on S3, click front panel, power amplifier will export specifies the pulse voltage of amplitude and pulsewidth to autompulse exciting device, autompulse exciting device drive coil obtain electric after produce magnetic field, magnetized by iron core, iron core is subject to the exciting force of electromagnetic force generation to measured piece;
Force signal can collect in computing machine through data collecting card by S4, the force snesor be arranged between impact head and push rod, according to the size of the power collected, can resonance-amplifier gain and pulse width further, realize the FEEDBACK CONTROL to impulsive force amplitude;
S5, on measured piece, connect acceleration transducer, force signal and acceleration signal are collected in computing machine, obtain frequency response function and the modal parameter of measured piece through process further.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105861969A (en) * | 2016-06-08 | 2016-08-17 | 北京工业大学 | Vibration treatment method for repairing copper thin film test piece with fatigue damage |
| CN108844705A (en) * | 2018-07-01 | 2018-11-20 | 北京工业大学 | A kind of autompulse excitation frequency response test device and method |
| CN109000877A (en) * | 2018-05-25 | 2018-12-14 | 西北工业大学 | A kind of system excited by impact and the test macro based on system excited by impact |
| CN110967158A (en) * | 2018-09-18 | 2020-04-07 | 乔治费歇尔加工方案公司 | Automatic impact initiation device |
| CN111089695A (en) * | 2019-12-27 | 2020-05-01 | 上海文倍测控科技有限公司 | Automatic modal testing method |
| CN113432818A (en) * | 2021-06-25 | 2021-09-24 | 上海交通大学 | Programmable force-excited blade vibration testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105861969A (en) * | 2016-06-08 | 2016-08-17 | 北京工业大学 | Vibration treatment method for repairing copper thin film test piece with fatigue damage |
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| CN108844705A (en) * | 2018-07-01 | 2018-11-20 | 北京工业大学 | A kind of autompulse excitation frequency response test device and method |
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| CN113432818A (en) * | 2021-06-25 | 2021-09-24 | 上海交通大学 | Programmable force-excited blade vibration testing device |
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| CN105258784B (en) | 2018-11-02 |
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