CN203115003U - Intelligent control system for mechanical structure damping - Google Patents
Intelligent control system for mechanical structure damping Download PDFInfo
- Publication number
- CN203115003U CN203115003U CN 201320087406 CN201320087406U CN203115003U CN 203115003 U CN203115003 U CN 203115003U CN 201320087406 CN201320087406 CN 201320087406 CN 201320087406 U CN201320087406 U CN 201320087406U CN 203115003 U CN203115003 U CN 203115003U
- Authority
- CN
- China
- Prior art keywords
- module
- damping
- control system
- piezoelectric actuator
- piezoelectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000013016 damping Methods 0.000 title claims abstract description 143
- 239000000463 material Substances 0.000 claims abstract description 76
- 239000011159 matrix material Substances 0.000 claims description 27
- 238000001914 filtration Methods 0.000 claims description 11
- YOEWQQVKRJEPAE-UHFFFAOYSA-L succinylcholine chloride (anhydrous) Chemical class [Cl-].[Cl-].C[N+](C)(C)CCOC(=O)CCC(=O)OCC[N+](C)(C)C YOEWQQVKRJEPAE-UHFFFAOYSA-L 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 5
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 5
- 230000004630 mental health Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 9
- 230000006378 damage Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 229920005549 butyl rubber Polymers 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005660 chlorination reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
The utility model discloses an intelligent control system for the damping size of a mechanical structure, which comprises a damping material layer, a piezoelectric actuator layer, a sensor, a damping control system and the like, wherein the lower part of the damping material layer is connected with a vibration structure base body, the upper part of the damping material layer is connected with the piezoelectric actuator layer, the piezoelectric sensor is connected with the lower surface or the upper surface of the vibration structure base body, the hardware of the damping control system mainly comprises a computer, an NI-PCI4472 board, a DAQ board, a charge amplifier, a power amplifier and the like, the piezoelectric sensor is connected with the NI-PCI4472 board through the charge amplifier, the NI-PCI4472 board is connected with the piezoelectric actuator layer through the DAQ board and the power amplifier, the sensor is the piezoelectric sensor, the damping control system adopts an NI control system and a damping control algorithm module, the structural damping can be spontaneously changed, the, the precision of the equipment is kept, the service life is prolonged, the noise pollution of the structure to the environment is inhibited, and the physical and mental health of operators is ensured.
Description
Technical field
The utility model relates to mechanical vibration and noise control technique field, relates in particular to a kind of mechanical structure damping size intelligent control system.
Background technique
Vibration extensively is present in the mechanical system under the various working staties, in aircraft such as the traffic tool such as automobile, train, steamer and aircraft, rocket, satellite.Strong vibration not only can influence accuracy and the stability of instrument and apparatus work, also can shorten the life-span of structure when serious because of fatigue ruption, perhaps damages structure because of resonance.Simultaneously, owing to vibrating the pollution that the noise that produces not only causes environment, go back entail dangers to operator's physical and mental health.Therefore, must reduce the vibration of equipment, yet from present research situation, great majority are to adopt the method for additional damping material to control, but it has the following disadvantages:
1) since the operating load of equipment, operating conditions etc. often change, the vibration severe degree that causes is also changing, in case and common additional damping material layer fabrication and installation are good, its damping size is just immutable, when comparatively violent vibration takes place mechanical system running environment, when particularly resonating, itself do not possess the ability that increases damping.
2) present in the way of passive insulation, when low-frequency vibration takes place on the basis, increase the amplitude that damping can reduce structure greatly; And under basic high frequency pumping, increase damping its amplitude is increased to some extent.
Summary of the invention
The utility model is exactly in order to solve the prior art above shortcomings, a kind of mechanical structure damping size intelligent control system is provided, when vibration takes place in mechanical structure, intellectuality control by the damping size, can spontaneously change structural damping, make vibration decay quickly, and different environment made corresponding reaction, reduce the damage that mechanical system causes because of vibration, the precision of maintenance equipment and functional reliability, in the working life of prolongation equipment, suppress structure to the noise pollution of environment generation, assurance operator's physical and mental health.
To achieve these goals, the utility model adopts following technological scheme:
A kind of mechanical structure damping size intelligent control system, comprise the damping material layer, the piezoelectric actuator layer, sensor and damped control system, the bottom of described damping material layer is connected with the vibrational structure matrix, top is connected with the piezoelectric actuator layer, piezoelectric transducer is connected with vibrational structure matrix lower surface or upper surface, damped control system mainly comprises computer, the NIPCI4472 integrated circuit board, the DAQ integrated circuit board, charge amplifier, power amplifier etc., wherein piezoelectric transducer is connected with the NIPCI4472 integrated circuit board by charge amplifier, and the NI-PCI4472 integrated circuit board is by the DAQ integrated circuit board, power amplifier is connected with the piezoelectric actuator layer.
Described damped control system hardware using NI control system, software then are damping control algorithm module.
Described NI control system adopts the NI-PCI4472 integrated circuit board, and 8 passage dynamic signal acquisition cards of highi degree of accuracy frequency domain measurement are applicable to the signals collecting of vibration transducer; The NI-PCI4472 integrated circuit board is connected, is used in combination with Lab VIEW sound and vibratory tool bag module, can carry out high-precision measurement, can gather, analyze and record vibration data fast, satisfy the collection requirement of mechanical structure damping size intelligent control system vibrational state information fully.
Described damping control algorithm module adopts F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module, described F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module comprises the structure characteristic module, the filter parameter module, comparator module, the LMS module, the first control channel characteristic module, the second control channel characteristic module, wherein the structure characteristic module is connected with comparator module, filter module is connected with comparator module by the first control channel characteristic module, comparator module is connected with the LMS module, the second control channel characteristic module is connected with the LMS module, and the LMS module is connected with filter module.The F-XLMS algorithm is divided into two kinds of situations in the utility model, and a kind of is the F-XLMS algorithm that increases damping, and another kind is the anti-F-XLMS algorithm that reduces damping.The former is, when piezoelectric transducer is affixed on the lower surface of flexure vibrations structural matrix, voltage signal and sensor cophasing that damped control system is sent, when piezoelectric transducer is affixed on the upper surface of flexure vibrations structural matrix, voltage signal and sensor antiphase that damped control system is sent allow the amplitude of control voltage increase simultaneously, and piezoelectric actuator layer distortion amplitude also just increases, the damping material layer obtains big shear deformation, thus the damping that improves total; The latter is opposite with the former, and amplitude and the phase place of control voltage signal make the distortion of piezoelectric actuator layer close to the distortion of base structure, make the damping material layer obtain minimum shear deformation, thereby reduce the damping of total.
Described F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module for the forced vibration that is caused by brace foundation, when excited frequency during less than 1.41 times structural natural frequencies, adopts the F-XLMS algorithm that increases damping, and effectively control structure is vibrated; When excited frequency during greater than 1.41 times structural natural frequencies, adopt the F-XLMS algorithm that reduces damping.To satisfy the requirement of different vibrations: for the forced vibration that is caused by brace foundation, when resonance takes place structure, increase the amplitude that damping can reduce structure greatly; And under high frequency pumping, increase damping its amplitude is increased to some extent.
Described damping material layer adopts chlorinated scoline or neoprene or nitrile butadiene rubber.Adopt macromolecule damping materials such as neoprene, nitrile butadiene rubber, chlorinated scoline as damping material, can prevent or alleviate mechanical vibration to the destruction of equipment.The chlorinated scoline damping material, because having many methyl on the butyl rubber molecular chain, elastic hysteresis is bigger, thus have superior damping capacity, and after the butyl rubber chlorination, reactive and bond properties obviously improves.The damping material laminating is at the vibrational structure matrix surface, and the piezoelectric actuator layer then is attached to damping material layer top.
Described piezoelectric actuator layer adopts piezopolymer polyvinylidene fluoride (PVDF) as piezoelectric material.This material has higher piezoelectric constant and electromechanical coupling factor, therefore has higher sensitivity and frequency response characteristic.This piezoelectric actuator laminating is on the damping material layer, the both sides up and down of piezoelectric actuator layer are connected respectively on the power amplifier by lead, damped control system sends control signal, behind power amplifier, the piezoelectric actuator layer is applied voltage, piezoelectric material generation inverse piezoelectric effect drives the damping material layer and elongates or shortens together, makes it that shear deformation take place.When piezoelectric transducer is affixed on the lower surface of flexure vibrations structural matrix surface plate, the voltage signal that damped control system sends and sensor cophasing; When piezoelectric transducer was affixed on the upper surface of flexure vibrations structural matrix panel, the voltage signal that damped control system sends and sensor antiphase made the polymer damping material layer obtain big shear deformation like this, thus the damping that improves total.Otherwise, when amplitude and the phase place of control signal makes the distortion of piezoelectric actuator layer identical close to the distortion of sensor and direction, make the polymer damping material layer obtain minimum shear deformation, thereby reduce the damping of total.So measure original paper and the phase place of control signal and the amplitude of control signal by adjusting, can realize the intellectuality control of damping size.
Described sensor is piezoelectric transducer, adopt piezoelectric transducer that the vibrational state information of mechanical device such as acceleration, amplitude, frequency etc. are fed back to damped control system to realize the intelligent control of damping, have highly sensitive, volume is little, in light weight, characteristics such as dynamic characteristic good, frequency response is fast.
Working principle of the present utility model: for piezoelectric material, when being subjected to active force along certain orientation, not only produce mechanically deformation, and internal polarization, the surface has electric charge to occur, after removing external force, can return to original uncharged state again, this phenomenon is called piezoelectric effect.On the contrary, if the polarised direction at these materials applies electric field, electric field strengthens polarization intensity, just make the distance increase between the positive and negative bound charge in the piezoelectric material, it can namely elongate or shorten in this direction, after removing extra electric field because being subjected to electric field force to produce mechanically deformation, distortion can disappear thereupon, and this phenomenon is called inverse piezoelectric effect.Because the inverse piezoelectric effect of piezoelectric material, its strain is directly proportional with energising voltage.When the piezoelectric actuator layer is switched on, can produce electric field at its two ends, by control energising voltage, change electric field strength, the piezoelectric actuator layer is elongated or shortened accordingly, and drive damping material layer elongates or shortens together, because the damping material ply strain changes, can cause its damping size also to change, namely by controlling the shearing strain size of stretching to control the damping material layer of piezoelectric actuator layer thereupon, thereby realize the controllability of damping size, reach the purpose of control damping size.
The beneficial effects of the utility model:
1. the utility model combines modern control theory, computer technology and piezoelectric material technology, when mechanical oscillatory structure, spontaneously change structural damping, its vibration is decayed quickly, realization is to the intelligent ACTIVE CONTROL of mechanical oscillatory structure, reduce the damage that mechanical system causes because of vibration, the precision of maintenance equipment, the working life of prolongation equipment, and suppress structure to the noise pollution of environment generation, assurance operator's physical and mental health, and practical, reliability is high, good economy performance;
2. adopt piezoelectric transducer that the vibrational state information of mechanical device is monitored in real time, realize the intelligent control of damping, have highly sensitive, volume is little, in light weight, dynamic characteristic good, frequency response is fast characteristics;
3. adopt NI-PCI4472 integrated circuit board and Lab VIEW sound and vibratory tool bag module to carry out high-precision measurement, can gather, analyze and record vibration data fast, satisfy mechanical structure damping size intelligent control system fully to the collection requirement of vibrational state information;
4. adopt the piezopolymer polyvinylidene fluoride as the piezoelectric actuator layer material, have higher sensitivity and frequency response characteristic, by adjusting measuring cell and the phase place of control signal and the amplitude of control signal, realize the intellectuality control of damping size;
5. adopt macromolecule damping material such as chlorinated scoline as damping material, can prevent or alleviate mechanical vibration to the destruction of equipment.
Description of drawings
Fig. 1 is structural drawing of the present utility model;
Fig. 2 is schematic diagram of the present utility model;
Fig. 3 is control system figure of the present utility model;
Fig. 4 when body structure surface compressive strain, the schematic diagram of deattenuation;
Fig. 5 when body structure surface compressive strain, the schematic diagram that damping increases;
Fig. 6 when the body structure surface elongation strain, the schematic diagram of deattenuation;
Fig. 7 when the body structure surface elongation strain, the schematic diagram that damping increases;
Fig. 8 is F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algorithm structure figure.
Among the figure: 1. piezoelectric actuator layer, 2. damping material layer, 3. vibrational structure matrix, 4. vibration transducer 5. is equipped with the computer of LabVIEW, 6.NI-PCI4472 integrated circuit board.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
A kind of mechanical structure damping size intelligent control system, in conjunction with Fig. 1 to Fig. 8, comprise piezoelectric actuator layer 1, damping material layer 2, vibration transducer 4 and damped control system, the bottom of described damping material layer 2 is connected with vibrational structure matrix 3, top is connected with piezoelectric actuator layer 1, vibration transducer 4 is connected with vibrational structure matrix 3 lower surfaces or upper surface, damped control system mainly comprises computer, NI-PCI4472 integrated circuit board 6, the DAQ integrated circuit board, charge amplifier, power amplifier etc., wherein vibration transducer 4 is connected with NI-PCI4472 integrated circuit board 6 by charge amplifier, and NI-PCI4472 integrated circuit board 6 is by the DAQ integrated circuit board, power amplifier is connected with piezoelectric actuator layer 1.Computer adopts the computer that Lab VIEW is installed.
Described vibration transducer 4 is piezoelectric transducer.
Described damped control system hardware using NI control system, software is damping control algorithm module; Described damping control algorithm module adopts F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module.Described FXLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module comprises structure characteristic module C, filter parameter module W, comparator module, the LMS module, the first control channel characteristic module H1, the second control channel characteristic module H2, wherein structure characteristic module C is connected with comparator module, filter parameter module W is connected with comparator module by the first control channel characteristic module H1, comparator module is connected with the LMS module, the second control channel characteristic module H2 is connected with the LMS module, the LMS module is connected with filter parameter module W, specifically see Fig. 8, wherein structure characteristic module C is vibrational structure matrix matrix, and filter parameter module W is sef-adapting filter.The F-XLMS adaptive filter algorithm utilizes vibration transducer to extract the signal of vibration source as reference signal X, X is divided into two-way, the former obtains signal d (n) behind structure characteristic module C, d (n) obtains e (n) with the signal of the first control channel characteristic module H1 after comparator is handled; The latter behind the second control channel characteristic module H2 with e (n) jointly as the input signal of LMS algorithm, through obtaining secondary control signal y (n) behind the wave filter parameter module W, after y (n) handles by the first control channel characteristic module H1 again, controlled system output signal.The F-XLMS algorithm is divided into two kinds of situations in the utility model, and a kind of is the F-XLMS algorithm that increases damping, and another kind is the anti-F-XLMS algorithm that reduces damping.The former is, when piezoelectric transducer is affixed on the lower surface of vibrational structure matrix, voltage signal and sensor cophasing that damped control system is sent, when piezoelectric transducer is affixed on the upper surface of vibrational structure matrix, voltage signal and sensor antiphase that damped control system is sent allow the amplitude of control voltage increase simultaneously, and piezoelectric actuator layer distortion amplitude also just increases, the damping material layer obtains big shear deformation, thus the damping that improves total; The latter is opposite with the former, and amplitude and the phase place of control voltage signal make the distortion of piezoelectric actuator layer close to the distortion of base structure, make the damping material layer obtain minimum shear deformation, thereby reduce the damping of total.
The NI control system adopts the NI-PCI4472 integrated circuit board, and 8 passage dynamic signal acquisition cards of highi degree of accuracy frequency domain measurement are applicable to the signals collecting of vibration transducer.Piezoelectric transducer is connected with the NI-PCI4472 integrated circuit board by charge amplifier, and the NI-PCI4472 integrated circuit board is connected with the piezoelectric actuator layer by DAQ integrated circuit board, power amplifier.
F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module for the forced vibration that is caused by brace foundation, when excited frequency during less than 1.41 times structural natural frequencies, adopts the F-XLMS algorithm that increases damping, control structure vibration effectively; When excited frequency during greater than 1.41 times structural natural frequencies, adopt the F-XLMS algorithm that reduces damping.To satisfy the requirement of different vibrations: for the forced vibration that is caused by brace foundation, when resonance takes place structure, increase the amplitude that damping can reduce structure greatly; And under high frequency pumping, increase damping its amplitude is increased to some extent.When carrying out damping increase control, controller control actuator makes the damping material layer that strain greatly take place, and strain is the bigger the better; When carrying out deattenuation control, the damping material layer takes place than small strain in controller control actuator, and strain is the smaller the better.
Described damping material layer adopts chlorinated scoline, neoprene, nitrile butadiene rubber.Adopt macromolecule damping materials such as neoprene, nitrile butadiene rubber, chlorinated scoline as damping material, can prevent or alleviate mechanical vibration to the destruction of equipment.The chlorinated scoline damping material, because having many methyl on the butyl rubber molecular chain, elastic hysteresis is bigger, thus have superior damping capacity, and after the butyl rubber chlorination, reactive and bond properties obviously improves.The damping material laminating is at the vibrational structure matrix surface, and the piezoelectric actuator layer then is attached to damping material layer top.
Described piezoelectric actuator layer adopts piezopolymer polyvinylidene fluoride (PVDF) as piezoelectric material.This material has higher piezoelectric constant and electromechanical coupling factor, therefore has higher sensitivity and frequency response characteristic.This piezoelectric actuator laminating is on the damping material layer, the both sides up and down of piezoelectric actuator layer are connected respectively on the power amplifier by lead, damped control system sends control signal, through power amplifier, the piezoelectric actuator layer is applied electric field, piezoelectric material generation inverse piezoelectric effect drives the damping material layer and elongates or shortens together, makes it that shear deformation take place.When piezoelectric transducer is affixed on the lower surface of flexure vibrations structural matrix panel, the voltage signal that damped control system sends and sensor cophasing; When piezoelectric transducer was affixed on the upper surface of flexure vibrations structural matrix panel, the voltage signal that damped control system sends and sensor antiphase made the polymer damping material layer obtain big shear deformation like this, thus the damping that improves total.Otherwise, when the amplitude of control signal makes the voltage layer distortion identical close to the distortion of sensor and direction, make the polymer damping material layer obtain minimum shear deformation, thereby reduce the damping of total.So measure original paper and the phase place of control signal and the amplitude of control signal by adjusting, can realize the intellectuality control of damping size.
Working principle of the present utility model: for piezoelectric material, when being subjected to active force along certain orientation, not only produce mechanically deformation, and internal polarization, the surface has electric charge to occur, after removing external force, can return to original uncharged state again, this phenomenon is called piezoelectric effect.On the contrary, if the polarised direction at these materials applies electric field, electric field strengthens polarization intensity, just make the distance increase between the positive and negative bound charge in the piezoelectric material, it can namely elongate or shorten in this direction, after removing extra electric field because being subjected to electric field force to produce mechanically deformation, distortion can disappear thereupon, and this phenomenon is called inverse piezoelectric effect.Because the inverse piezoelectric effect of piezoelectric material, its strain is directly proportional with energising voltage.When the piezoelectric actuator layer is switched on, can produce electric field at its two ends, by control energising voltage, change electric field strength, the piezoelectric actuator layer is elongated or shortened accordingly, and drive damping material layer elongates or shortens together, because the damping material ply strain changes, can cause its damping size also to change, namely by controlling the shearing strain size of stretching to control the damping material layer of piezoelectric actuator layer thereupon, thereby realize the controllability of damping size, reach the purpose of control damping size.
When piezoelectric transducer is affixed on flexure vibrations structural matrix lower surface, the voltage signal that damped control system sends and sensor cophasing, and the more big effect of the amplitude of control signal is more good; When piezoelectric transducer is affixed on flexure vibrations structural matrix upper surface, the voltage signal that damped control system sends and sensor antiphase, the more big effect of amplitude of same control signal is more good, make the polymer damping material layer obtain big shear deformation like this, thus the damping that improves total.Otherwise, when the amplitude of control signal makes the voltage layer distortion consistent close to the distortion of sensor and direction, make the polymer damping material layer obtain minimum shear deformation, thereby reduce the damping of total.So, measure original paper and the phase place of control signal and the amplitude of control signal by adjusting, can realize the intellectuality control of damping size.
This device piezoelectric actuator layer polarised direction is thickness direction, and deformation direction is length direction, side joint positive source on the piezoelectric actuator layer, and following side joint negative pole namely leads to forward voltage, the elongation of piezoelectric actuator layer; Otherwise, side joint power cathode on the piezoelectric actuator layer, following side joint positive pole namely leads to backward voltage, and the piezoelectric actuator layer shrinks.
When the vibration matrix shrank distortion, if the logical backward voltage of piezoelectric actuator layer, the damping material layer was under the piezoelectric actuator layer drives, with the equidirectional contraction of vibrational structure matrix, then the damping material layer obtains less shear deformation, and see Fig. 4 for reducing the damping situation this moment; If the logical forward voltage of piezoelectric actuator layer, the damping material layer extends in the other direction with the vibrational structure matrix under the piezoelectric actuator layer drives, and then the damping material layer obtains big shear deformation, and see Fig. 5 for increasing the damping situation this moment.
When vibrational structure matrix generation elongation strain, if the logical forward voltage of piezoelectric actuator layer, the damping material layer is under the piezoelectric actuator layer drives, with the equidirectional elongation of vibrational structure matrix, then the damping material layer obtains less shear deformation, and see Fig. 6 for reducing the damping situation this moment; If the logical backward voltage of piezoelectric actuator layer, the damping material layer shrinks in the other direction with the vibrational structure matrix under the piezoelectric actuator layer drives, and then the damping material layer obtains big shear deformation, and see Fig. 7 for increasing the damping situation this moment.
The utility model utilizes above-mentioned principle, when base structure vibrates, damped control system utilizes the F-XLMS adaptive filter algorithm that the actuator layer is controlled, realize the controllability of this device damping size, the structure of mechanical structure damping size intelligent control system is seen Fig. 1, the principle of mechanical structure damping size intelligent control system as shown in Figure 2, mechanical structure damping size intelligent control system as shown in Figure 3, the damping change principle of mechanical structure damping size intelligent control system is seen Fig. 4,5,6,7, adopt F-XLMS adaptive filter algorithm block diagram to see Fig. 8.
When the mechanical system operating condition changes or during environmental change, cause that the system architecture vibration state changes, when the detected vibrational state of vibration transducer exceeds the vibration settings value of system, sensor is converted into electrical signal with vibrational state information, through charge amplifier, be divided into two-way, one the tunnel as feedback signal, deliver to the DAQ integrated circuit board through the NI-PCI4472 integrated circuit board, another road is sent to the computer of damped control system, this computer compares measured value and control desired value, and make corresponding processing information according to control algorithm, send control signal to power amplifier then, amplify output voltage by power amplifier, thereby the voltage swing that is carried on the piezoelectric actuator layer is changed, because the inverse piezoelectric effect of piezoelectric material, piezoelectric actuator layer length changes, and it is flexible together to drive the damping material layer, reaches the purpose of control damping size.This process that vibration transducer is given damped control system with the vibrational state feedback information has realized the closed loop control of damping.Like this, just, realized the intellectuality control of whole mechanical structure damping size.
Native system adopts F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algorithm, and what be exactly system according to output signal and expected value is poor, obtains corresponding control reduction value and input signal is subsequently revised, and makes the output of system progressively be tending towards expected value.Adaptive-filtering feedforward ACTIVE CONTROL algorithm can constantly be regulated self parameter makes the output of system from the motion tracking oscillating signal, make external environmental interference complicated and changeable can access timely inhibition, and its operand is little, implementation procedure mainly is interative computation, this is conducive to programming and realizes its function, alleviates the burden of damped control system computer.
Though above-mentionedly by reference to the accompanying drawings the embodiment of model utility is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (6)
1. mechanical structure damping size intelligent control system, it is characterized in that, described system comprises the damping material layer, the piezoelectric actuator layer, vibration transducer and damped control system, the bottom of described damping material layer is connected with the vibrational structure matrix, top is connected with the piezoelectric actuator layer, vibration transducer is connected with vibrational structure matrix lower surface or upper surface, damped control system mainly comprises computer, the NI-PCI4472 integrated circuit board, the DAQ integrated circuit board, charge amplifier, power amplifier, wherein vibration transducer is connected with the NI-PCI4472 integrated circuit board by charge amplifier, and the NI-PCI4472 integrated circuit board is by the DAQ integrated circuit board, power amplifier is connected with the piezoelectric actuator layer.
2. mechanical structure damping size intelligent control system as claimed in claim 1 is characterized in that described damping material layer adopts chlorinated scoline or neoprene or nitrile butadiene rubber.
3. mechanical structure damping size intelligent control system as claimed in claim 1 is characterized in that described piezoelectric actuator layer adopts the piezopolymer polyvinylidene fluoride as piezoelectric material.
4. mechanical structure damping size intelligent control system as claimed in claim 1 is characterized in that described vibration transducer is piezoelectric transducer.
5. mechanical structure damping as claimed in claim 1 size intelligent control system, it is characterized in that, described damped control system adopts damping control algorithm module, described damping control algorithm module adopts F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module, described F-XLMS adaptive-filtering feedforward ACTIVE CONTROL algoritic module comprises the structure characteristic module, the filter parameter module, comparator module, the LMS module, the first control channel characteristic module, the second control channel characteristic module, wherein the structure characteristic module is connected with comparator module, filter module is connected with comparator module by the first control channel characteristic module, comparator module is connected with the LMS module, the second control channel characteristic module is connected with the LMS module, and the LMS module is connected with filter module.
6. mechanical structure damping size intelligent control system as claimed in claim 5 is characterized in that described NI-PCI4472 integrated circuit board is connected with Lab VIEW sound and vibratory tool bag module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320087406 CN203115003U (en) | 2013-02-26 | 2013-02-26 | Intelligent control system for mechanical structure damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320087406 CN203115003U (en) | 2013-02-26 | 2013-02-26 | Intelligent control system for mechanical structure damping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203115003U true CN203115003U (en) | 2013-08-07 |
Family
ID=48895353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320087406 Expired - Fee Related CN203115003U (en) | 2013-02-26 | 2013-02-26 | Intelligent control system for mechanical structure damping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203115003U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195863A (en) * | 2013-02-26 | 2013-07-10 | 青岛理工大学 | Intelligent control system for mechanical structure damping |
-
2013
- 2013-02-26 CN CN 201320087406 patent/CN203115003U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195863A (en) * | 2013-02-26 | 2013-07-10 | 青岛理工大学 | Intelligent control system for mechanical structure damping |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gripp et al. | Vibration and noise control using shunted piezoelectric transducers: A review | |
| CN103195863B (en) | Intelligent control system for mechanical structure damping | |
| Yamada et al. | Optimum tuning of series and parallel LR circuits for passive vibration suppression using piezoelectric elements | |
| Cornwell et al. | Enhancing power harvesting using a tuned auxiliary structure | |
| Shen et al. | A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sources | |
| US11486461B2 (en) | Self-powered vibration damper based on piezoelectricity and control method thereof | |
| CN102777527B (en) | Intelligent vibration isolation device for precision machine tool | |
| Kumar et al. | Active vibration control of smart piezo cantilever beam using pid controller | |
| Ashour et al. | Adaptive control of flexible structures using a nonlinear vibration absorber | |
| CN105134866A (en) | Piezoelectric active vibration isolating mechanism and method for reducing inherent frequency of vibrating system | |
| CN105736620B (en) | A kind of piezo-electric type tuned mass damper | |
| Ji et al. | Semi-active vibration control of a composite beam by adaptive synchronized switching on voltage sources based on LMS algorithm | |
| Ji et al. | Multi-modal vibration control using a synchronized switch based on a displacement switching threshold | |
| Li et al. | Structural vibration control by synchronized switch damping energy transfer | |
| CN103244603A (en) | Active electromagnetic control system for vibration of plate-girder structure | |
| CN203115003U (en) | Intelligent control system for mechanical structure damping | |
| Guyomar et al. | Sound wave transmission reduction through a plate using piezoelectric synchronized switch damping technique | |
| CN203272588U (en) | Active electromagnetic control system for vibration of plate-girder structure | |
| CN2886208Y (en) | Magnetorheological elastomer active vibration absorbing system | |
| Berta et al. | Active Vibration Damping of Cantilever Beam using LabVIEW | |
| Shen et al. | A semi-passive vibration damping system powered by harvested energy | |
| Richard et al. | Board multimodal vibration control using piezoelectric synchronized switch damping techniques | |
| Guyomar et al. | Damping behavior of semi-passive vibration control using shunted piezoelectric materials | |
| Wang et al. | Synchronous charge extraction and voltage inversion (SCEVI): a new efficient vibration-based energy harvesting scheme | |
| CN202851783U (en) | Intelligent vibration isolating device for sophisticated tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20180226 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |