CN103506299A - Vibrational excitation method and device capable of automatically tracing natural frequency - Google Patents
Vibrational excitation method and device capable of automatically tracing natural frequency Download PDFInfo
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- CN103506299A CN103506299A CN201310488305.7A CN201310488305A CN103506299A CN 103506299 A CN103506299 A CN 103506299A CN 201310488305 A CN201310488305 A CN 201310488305A CN 103506299 A CN103506299 A CN 103506299A
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Abstract
The invention discloses a vibrational excitation method and device capable of automatically tracing natural frequency. The vibrational excitation device comprises a vibration table, a vibration sensor mounted on the vibration table, an electromagnetic vibration exciter connected with the vibration table through a connecting rod, and a vibration controller connected between the electromagnetic vibration exciter and the vibration sensor. The vibration controller comprises a signal converter and a limiting amplifier. According to the vibrational excitation method and device capable of automatically tracing the natural frequency, an exciting device does not need a signal source, the device is a closed-loop positive feedback control system, the device is in an instability state when starting to work, when the gain of the vibration controller is adjusted to be in an appropriate value, the device can automatically trace the natural frequency of the vibration table without external exciting, the vibration table always vibrates in a resonance state, the vibration amplitude is adjustable, adjusting is convenient, energy consumption is low, and the adaptive capacity to the environment is strong. The vibrational excitation device is simple in structure, low in cost, convenient to use and capable of adapting to complex environments.
Description
Technical field
The present invention relates to a kind of self-excitation resonance principle that utilizes, make vibrating device automatic tracking system intrinsic frequency, make device always work in resonance state.To reach raising Oscillation Amplitude, reduce energy resource consumption object, be applicable to the vibration utilization of processing and manufacturing and other industry.
Background technology
Vibrating device is gathered around and is had been widely used in all trades and professions, for example, and oscillating feeder, jigging conveyer, vibration finishing etc.In Vibration Using Engineering, how under limited input energy situation, to produce large as far as possible Oscillation Amplitude, for improving, vibrating device efficiency is significant.
Vibrating device adopts vibrating motor excitation to produce forced vibration mostly at present, and generally, all in off-resonance state, required exciting force is larger, has reduced the operating efficiency of vibrating device, has increased energy consumption.When system works is during in resonance state; less excitation can produce larger vibration; yet in the vibrating device course of work; intrinsic frequency usually can change along with the variation of duty; therefore how tracking system intrinsic frequency, making vibrating device always work in resonance state is to improve the key of vibrating device operating efficiency.
Current vibrational excitation method is to need outside source to produce input signal mostly, and the signal frequency vibration that vibrator produces by signal source is under normal circumstances irrelevant with incentive object, the signal frequency vibration that vibratory equipment produces by signal source.
Summary of the invention
The object of this invention is to provide a kind of automatic tracing vibrational excitation method and apparatus of frequency admittedly, utilize the work of positive feedback self-excited vibration principle, do not need independently signal source, can real-time tracking system intrinsic frequency, and keep the vibrational excitation method and apparatus that oscillation intensity is stable, make vibrating device change and always work in resonance state with duty, Oscillation Amplitude is adjustable, easy to adjust, energy consumption is low, adaptable to environment.
The present invention adopts following technical scheme: a kind of automatic tracing is the vibrating device of frequency admittedly, involving vibrations platform and be arranged on vibrating sensor, the electromagnetic exciter being connected with shake table by connecting rod on shake table, be connected to the vibrating controller between electromagnetic exciter and vibrating sensor, described vibrating controller comprises signal adapter and limiting amplifier.
In technique scheme, described vibrating sensor can arbitrarily regulate in shake table Shang installation site.
In technique scheme, described connecting rod adopts elastomeric material to make, and adopts universal loose joint structure with being connected of vibrating device.
In technique scheme, described motivational techniques comprise following job step:
Step 1: initialization system, the various piece in device is in running order;
Step 2: vibrating sensor gathers the vibration signal of vibrating device, when vibrating sensor collects signal, by cable, signal is transferred in the signal adapter in vibrating controller;
Step 3: signal adapter carries out the information receiving in signal data analysis and is converted to vibration velocity signal, vibration velocity signal is adjusted to signal amplification factor through limiting amplifier the numerical value that can produce self-excited vibration, and arrives electromagnetic exciter by cable transmission;
Step 4: electromagnetic exciter receives the vibration velocity signal of input, electromagnetic exciter produces vibration, and electromagnetic exciter output drives shake table to vibrate by connecting rod;
Step 5: vibrating device repeats by step 2, step 3, step 4 work, generation along with self-excited vibration, the vibration frequency of shake table trends towards system frequency, the Oscillation Amplitude producing is also increasing, when reaching setting signal amplitude, the vibration suppression link of limiting amplifier work in vibrating controller, Oscillation Amplitude is stabilized in setting amplitude, and resulting device is vibrated at system frequency place with stable Oscillation Amplitude.
In technique scheme, by changing the installation site of vibrating sensor, regulate the intrinsic frequency of shake table work.
In the present invention, vibrating sensor is installed on the vibration of picking up shake table on shake table, vibrating sensor can be vibration displacement sensor, vibration acceleration sensor, a kind of in vibrating speed sensors, the vibration signal that vibrating sensor picks up is input to signal adapter by signal cable, converter dissimilar vibrating sensor is picked up vibration signal by nonidentity operation mode, be converted to vibration velocity signal, conversion regime is determined according to vibrating sensor type, when the signal picking up when sensor is vibration acceleration signal, it is vibration velocity signal that vibrating controller carries out Integral Transformation by vibration signal, when sensor pickoff signals is vibration displacement signal, vibrating controller carries out differential by this vibration signal and becomes rate signal, if sensor pickoff signals is rate signal, without conversion.
Vibration velocity signal after conversion is sent into the limiting amplifier in vibrating controller, and limiting amplifier has two kinds of functions: the one, and assurance device can produce self-excited vibration reliably, and the secondth, the vibration that assurance device can be stable.Limiting amplifier is comprised of two parts, and the one, the positive feedback being comprised of power amplification link, completes the amplification of inputted vibration rate signal, so that this vibrational excitation system can be vibrated voluntarily.This part has the adjustable signal amplifying function of gain, after resonance-amplifier gain switches on power device, system can be vibrated voluntarily, generation along with self-excited vibration, vibration finally trends towards the vibration of system frequency place, specifically relevant with the position of vibrating sensor with which rank natural frequency vibration.It is stable that the negative-feedback that second portion consists of fixed ampllitude link realizes signal amplitude, and along with the generation of self-excited vibration, vibration can be increasing, and the waveform of vibration also can produce distortion, so with regard to no longer increasing, settles out after need to making amplitude greatly to a certain extent.This part realizes signal Oscillation Amplitude suppressor mode.
The signal of vibrating controller output is by amplifying the vibration velocity signal input vibrator suppressing with amplitude, vibrator vibration output is connected with shake table, the vibration of vibrator makes shake table produce vibration by connecting rod, connecting rod material requires to adopt spring steel elastomeric material to make, and adopts universal loose joint structure with being connected of shake table.
Shake table is comprised of spring and mechanical structured member, by calculating with test, can draw shake table each rank intrinsic frequency and vibration shape, and when whole device is operated in eigentone lower time, the Oscillation Amplitude of shake table is maximum, and vibration is less when other frequency places; Under eigentone, work, the exciting force of electromagnetic exciter is minimum simultaneously.Therefore by positions different in shake table plane, vibrating sensor is installed and is also just meaned that whole will be operated in different intrinsic frequencies.Therefore whole shake table is because the installation site difference of vibrating sensor has possessed different selecting frequency characteristics.
In sum, owing to having adopted technique scheme, compared with prior art the invention has the beneficial effects as follows: common vibrational excitation system needs signal source, the signal frequency vibration that vibrator produces by signal source, irrelevant with operating frequency and incentive object, feature of the present invention is without signal source, and the operating frequency of vibrator can, from the intrinsic frequency of motion tracking incentive object, make system works in resonance state.The present invention has overcome conventional vibration excitation system needs signal source, and system is the equal of the closed loop feedback system with frequency-selecting link that there is no signal source.This device is without signal source, because system is a closed-loop feedback control system, while starting working in instability status, when system is adjusted to desired value by vibrating controller gain, without dynamic excitation, system just can be in the stable vibration in intrinsic frequency place, Oscillation Amplitude is adjustable, easy to adjust, energy consumption is low, adaptable to environment.This apparatus structure is simple, and cost is low, easy to use, can adapt to the work under complex environment.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is structural representation of the present invention;
Wherein: the 1st, vibrating sensor, the 2nd, signal adapter, the 3rd, limiting amplifier, the 4th, electromagnetic exciter, the 5th, connecting rod, the 6th, shake table.
The specific embodiment
Disclosed all features in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
As shown in Fig. 1, automatic tracing is the main involving vibrations platform 6 of vibrational excitation, vibrating sensor 1, vibrating controller, electromagnetic exciter 4, the connecting rod 5 of frequency admittedly, vibrating controller comprises signal adapter 2 and limiting amplifier 3, wherein vibrating sensor 1 is arranged on shake table 6, electromagnetic exciter 4 is connected with shake table 6 by connecting rod 5, and vibrating controller is connected between vibrating sensor 1 and electromagnetic exciter 4.Wherein vibrating sensor 1 can be a kind of in vibration displacement sensor, vibration acceleration sensor, vibrating speed sensors.
When whole device powers on while starting working, vibrating sensor 1 gathers the vibration signal of shake table 6, because shake table 6 self does not always have slight vibration before entering mode of operation under external interference, when these vibrations are when captured by vibrating sensor 1, vibrating sensor 1 by vibration signal by cable transmission in vibrating controller.Signal adapter 2 in vibrating controller is analyzed the vibration signal receiving change, and signal adapter 2, according to the different vibration signal of dissimilar vibrating sensor 1 transmission, converts vibration velocity signal to by corresponding compute mode; And vibration velocity signal is transferred to limiting amplifier 3, and limiting amplifier 3 amplifies the vibration velocity signal receiving by power amplifier, and multiplication factor can produce self-excited vibration with whole system and be advisable; The vibration output of electromagnetic exciter 4 outputs to shake table 6 by connecting rod 5 and drives shake table 6 to start vibration.
After shake table 6 vibrations, vibrating sensor 1 continues to gather vibration signal, and be transferred to vibrating controller, vibrating controller is by constantly accepting vibration signal and signal being amplified and is transferred to electromagnetic exciter 4, constantly promote the Oscillation Amplitude of electromagnetic exciter 4, vibration frequency finally trends towards system frequency.Along with the lifting vibration of amplitude can be increasing, the waveform of vibration also can produce distortion, and the negative-feedback that the fixed ampllitude link in limiting amplifier 3 forms realizes signal amplitude and stablizes resulting device and vibrate at system frequency place with stable Oscillation Amplitude.
Each rank intrinsic frequency of shake table is not identical with the vibration shape, and the amplitude versus frequency characte of shake table diverse location is also different, thereby the installation site that changes sensor can make the solid frequency that system keeps track is different, thereby system is vibrated under different solid frequencies.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (5)
1. automatic tracing vibrating device frequently admittedly, it is characterized by involving vibrations platform and be arranged on vibrating sensor, the electromagnetic exciter being connected with shake table by connecting rod on shake table, be connected to the vibrating controller between electromagnetic exciter and vibrating sensor, described vibrating controller comprises signal adapter and limiting amplifier.
2. a kind of automatic tracing according to claim 1 vibrating device frequently admittedly, is characterized by described vibrating sensor and can arbitrarily regulate in shake table Shang installation site.
3. a kind of automatic tracing according to claim 1 vibrating device frequently admittedly, is characterized by described connecting rod and adopts elastomeric material to make, and adopts universal loose joint structure with being connected of shake table.
4. a kind of automatic tracing according to claim 1 vibrational excitation method frequently admittedly, is characterized by described motivational techniques and comprises following job step:
Step 1: initialization system, the various piece in device is in running order;
Step 2: vibrating sensor gathers the vibration signal of shake table, when vibrating sensor collects signal, by cable, signal is transferred in the signal adapter in vibrating controller;
Step 3: signal adapter carries out the information receiving in signal data analysis and is converted to vibration velocity signal, vibration velocity signal is adjusted to signal amplification factor through limiting amplifier the numerical value that can produce self-excited vibration, and arrives electromagnetic exciter by cable transmission;
Step 4: electromagnetic exciter receives the vibration velocity signal of input, electromagnetic exciter produces vibration, and electromagnetic exciter output drives shake table to vibrate by connecting rod;
Step 5: vibrating device repeats by step 2, step 3, step 4 work, generation along with self-excited vibration, the vibration frequency of shake table trends towards system frequency, the Oscillation Amplitude producing is also increasing, when reaching setting signal amplitude, the vibration suppression link of limiting amplifier work in vibrating controller, Oscillation Amplitude is stabilized in setting amplitude, and resulting device is vibrated at system frequency place with stable Oscillation Amplitude.
5. according to claim 4 a kind of from motion tracking vibrational excitation method frequently admittedly, it is characterized by the intrinsic frequency that regulates shake table work by changing the installation site of vibrating sensor.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104290019A (en) * | 2014-10-20 | 2015-01-21 | 杨芳丽 | Magnetic vibration polishing machine and manufacturing method thereof |
| CN108144831A (en) * | 2016-12-05 | 2018-06-12 | 南京圣威惠众机电技术有限公司 | A kind of integrated dynamic force measures and the adjustable rotation vibrator of resonant frequency in real time |
| CN108469407A (en) * | 2018-03-16 | 2018-08-31 | 中国石油大学(华东) | A kind of device and method of detection clean surface degree |
| CN109443679A (en) * | 2018-11-30 | 2019-03-08 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of vibration experiment |
| CN109884985A (en) * | 2019-03-11 | 2019-06-14 | 上海理工大学 | The measurement method of numerically-controlled machine tool complete machine machining state dynamic characteristic |
| CN111229577A (en) * | 2020-02-14 | 2020-06-05 | 山东理工大学 | Micro-beam super-harmonic synchronous resonance signal frequency-doubling tuning amplification device |
| CN112758538A (en) * | 2021-01-07 | 2021-05-07 | 山西新元称重科学技术研究院有限公司 | Drum-shaped arch breaking device, storage bin and arch breaking method |
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| US5477958A (en) * | 1991-04-16 | 1995-12-26 | W. Schlafhorst Ag & Co. | Cop individualizing apparatus |
| CN1107978A (en) * | 1994-03-04 | 1995-09-06 | 谭家岱 | Tuning device of sonic resonant cavity |
| CN1338668A (en) * | 2000-08-11 | 2002-03-06 | Ykk株式会社 | Method and device for controlling piezo-vibration feeder |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104290019A (en) * | 2014-10-20 | 2015-01-21 | 杨芳丽 | Magnetic vibration polishing machine and manufacturing method thereof |
| CN108144831A (en) * | 2016-12-05 | 2018-06-12 | 南京圣威惠众机电技术有限公司 | A kind of integrated dynamic force measures and the adjustable rotation vibrator of resonant frequency in real time |
| CN108469407A (en) * | 2018-03-16 | 2018-08-31 | 中国石油大学(华东) | A kind of device and method of detection clean surface degree |
| CN109443679A (en) * | 2018-11-30 | 2019-03-08 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of vibration experiment |
| CN109884985A (en) * | 2019-03-11 | 2019-06-14 | 上海理工大学 | The measurement method of numerically-controlled machine tool complete machine machining state dynamic characteristic |
| CN111229577A (en) * | 2020-02-14 | 2020-06-05 | 山东理工大学 | Micro-beam super-harmonic synchronous resonance signal frequency-doubling tuning amplification device |
| CN111229577B (en) * | 2020-02-14 | 2021-06-01 | 山东理工大学 | Micro-beam super-harmonic synchronous resonance signal frequency-doubling tuning amplification device |
| CN112758538A (en) * | 2021-01-07 | 2021-05-07 | 山西新元称重科学技术研究院有限公司 | Drum-shaped arch breaking device, storage bin and arch breaking method |
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