CN114483867B - Damping piezoelectric vibration control circuit of self-adaptive voltage source synchronous switch - Google Patents
Damping piezoelectric vibration control circuit of self-adaptive voltage source synchronous switch Download PDFInfo
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000003044 adaptive effect Effects 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
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Abstract
The application relates to a self-adaptive voltage source synchronous switch damping piezoelectric vibration control circuit which is applied to a mechanical vibration structure attached with piezoelectric sheets, can effectively increase the damping of the structure, so that the vibration amplitude of the structure is rapidly reduced, and the damping introduced into the mechanical structure can be matched in real time according to the external vibration intensity, thereby avoiding the instability problem of the traditional SSDV circuit. The external vibration intensity information is obtained by monitoring the open-circuit voltage amplitude of the piezoelectric plate after the circuit is connected with the vibration intensity extraction module in real time, and the module consists of a passive envelope detection circuit and an RC low-pass filter. According to the magnitude of the fed-back piezoelectric voltage, the circuit adjusts the voltage magnitudes of two voltage sources with opposite polarities connected in series in the LC resonance circuit in real time, so that the continuous and stable operation of the system is ensured. The application has simple circuit design and low operation power consumption, can effectively inhibit the mechanical structure vibration in a wider frequency band range, and does not need an additional piezoelectric sheet or a laser displacement sensor.
Description
Technical Field
The application relates to a circuit technology applied to piezoelectric vibration control, in particular to a self-adaptive voltage source synchronous switch damping piezoelectric vibration control circuit.
Background
The piezoelectric vibration control system has the advantages of small volume, light weight, strong compatibility and the like, and has great potential in suppressing structural vibration. Well-known piezoelectric shunt damping vibration control techniques have been widely studied by students over the past two decades. Among them, SSDV (synchronized switch damping on voltage source, voltage source synchronous switching damping) is an effective piezoelectric shunt damping circuit design. However, the exemplary SSDV suffers from stability problems when the external excitation is weak because the amplitude of the voltage source in series remains unchanged all the time, because the piezoelectric plate acts no longer to dampen but to enhance the vibration. To preserve the superior vibration-damping properties of SSDV and solve the stability problem, researchers began to improve SSDV. Adaptive SSDV was first proposed by adoin Badel et al. The piezoelectric plate is arranged at the position of the original piezoelectric plate with a braking function to sense the vibration intensity, the sensed information is fed back to the controller, and the controller adjusts the voltage amplitude of the series voltage source according to a certain voltage coefficient so as to adapt to the current vibration intensity. Thereafter, various algorithms have been employed by the learner to more precisely adjust the voltage source amplitude while using a laser displacement sensor instead of an additional piezoelectric patch to sense the vibration intensity. Although the methods solve the stability problem of SSDV, DSP (digital signal processor) is adopted in the experiments to process the information fed back by the vibration sensing device (laser displacement sensor or additional piezoelectric sheet), and a practical circuit applicable to the application scene of real vibration suppression is not developed. How to design a self-adaptive SSDV circuit which does not need an additional vibration sensing module, is simple and practical and has low price has great research significance and commercial value.
Disclosure of Invention
Based on the above, it is necessary to provide a self-adaptive voltage source synchronous switch damping piezoelectric vibration control circuit with simple circuit structure and low cost.
An adaptive voltage source synchronous switch damping piezoelectric vibration control circuit, comprising: a piezoelectric element for being arranged on the controlled structure; a first adjustable voltage source; the second adjustable voltage source is the same as the first adjustable voltage source in voltage amplitude and opposite in polarity; the vibration intensity extraction module comprises an envelope detection circuit and a voltage division circuit connected with the envelope detection circuit, wherein the envelope detection circuit is used for obtaining the voltage value of the piezoelectric element, and the voltage division circuit is used for dividing the voltage output by the envelope detection circuit and outputting the divided voltage to the first adjustable voltage source so that the ratio of the voltage amplitude of the first adjustable voltage source to the voltage value of the piezoelectric element is a fixed value; an inductor L connected with the second end of the piezoelectric element; the positive peak switch and the negative peak switch are connected with the second adjustable voltage source and are used for being closed when the voltage value of the piezoelectric element reaches the maximum value, so that the inductor L and the piezoelectric element are communicated with the second adjustable voltage source through the positive peak switch, and an LC resonant circuit is formed to realize voltage overturning of the piezoelectric element; the negative peak switch is connected with the first adjustable voltage source and is used for being closed when the voltage value of the piezoelectric element reaches a minimum value, so that the inductor L and the piezoelectric element are communicated with the first adjustable voltage source through the negative peak switch, and an LC resonance circuit is formed to realize voltage overturning of the piezoelectric element; wherein the fixed value is (1-gamma)/(1+gamma), and gamma is a voltage inversion coefficient.
According to the self-adaptive voltage source synchronous switch damping piezoelectric vibration control circuit, according to the linear relation between the voltage amplitude of the piezoelectric element and the vibration intensity of the controlled structure and the voltage amplitude of the first adjustable voltage source, the real-time regulation and control of the voltage amplitudes of the first and second adjustable voltage sources are realized by adopting the envelope detection circuit and the voltage division circuit, so that a laser displacement sensor or an additional piezoelectric sheet is not needed to sense the vibration intensity, and the circuit is simple in structure and low in cost.
In one embodiment, the vibration intensity extraction module further comprises a low pass filter connected between the envelope detection circuit and the voltage divider circuit.
In one embodiment, the low pass filter is an RC low pass filter comprising a resistor R3 and a capacitor C1 connected to each other.
In one embodiment, the voltage dividing circuit includes a resistor R1 and a resistor R2 connected in series, one end of the resistor R1, which is not connected to the resistor R2, is connected to the resistor R3 and the capacitor C1, and one end of the resistor R1, which is connected to the resistor R2, is an output end of the voltage dividing circuit.
In one embodiment, the envelope detection circuit includes a diode D1 and a capacitor C2, where a cathode of the diode D1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the second end of the piezoelectric element, and an anode of the diode D1 is connected to the first end of the piezoelectric element.
In one embodiment, the first adjustable voltage source includes a voltage follower, and an input end of the voltage follower is connected to an output end of the voltage dividing circuit.
In one embodiment, the voltage follower includes an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to an output terminal of the voltage dividing circuit, and an inverting input terminal of the operational amplifier U1 is connected to an output terminal of the operational amplifier U1.
In one embodiment, the second adjustable voltage source comprises an inverting amplifier.
In one embodiment, the inverting amplifier includes an operational amplifier U2, a resistor R4, and a resistor R5, the resistor R4 is connected between the output terminal of the operational amplifier U1 and the inverting input terminal of the operational amplifier U2, and the resistor R5 is connected between the inverting input terminal of the operational amplifier U2 and the output terminal of the operational amplifier U2.
In one embodiment, the positive and negative peak switch further comprises a capacitor C3, and a second end of the capacitor C3 is connected to a second end of the piezoelectric element; the positive peak switch comprises a PNP triode Q2 and an NPN triode Q4, wherein the base electrode of the PNP triode Q2 is connected with the first end of the piezoelectric element and the collector electrode of the NPN triode Q4, the emitter electrode of the PNP triode Q2 is connected with the first end of the capacitor C3, the collector electrode of the PNP triode Q2 is connected with the base electrode of the NPN triode Q4, and the emitter electrode of the NPN triode Q4 is connected with the second adjustable voltage source; the negative peak switch comprises an NPN triode Q1 and a PNP triode Q3, wherein a base electrode of the NPN triode Q1 is connected with the first end of the piezoelectric element, an emitter electrode of the NPN triode Q1 is connected with the first end of the capacitor C3, a collector electrode of the NPN triode Q1 is connected with the base electrode of the PNP triode Q3, a collector electrode of the PNP triode Q3 is connected with the first end of the piezoelectric element, and an emitter electrode of the PNP triode Q3 is connected with the first adjustable voltage source.
Drawings
For a better description and illustration of embodiments and/or examples of those applications disclosed herein, reference may be made to one or more of the accompanying drawings. Additional details or examples used to describe the drawings should not be construed as limiting the scope of the disclosed application, the presently described embodiments and/or examples, and any of the presently understood modes of carrying out the application.
FIG. 1 is a schematic topology of an adaptive SSDV piezoelectric vibration control circuit in one embodiment;
FIG. 2 is a schematic circuit diagram of an adaptive SSDV piezoelectric vibration control circuit in one embodiment;
FIG. 3 is a schematic diagram of exemplary waveforms of an adaptive SSDV piezoelectric vibration control circuit in accordance with one embodiment;
FIG. 4 is a schematic diagram of the energy cycle of an adaptive SSDV piezoelectric vibration control circuit in one embodiment;
fig. 5 is a schematic diagram showing the comparison of the simulation results of an adaptive SSDV piezoelectric vibration control circuit and a conventional SSDV according to an embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element or layer is referred to as being "on," "adjacent," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
The application provides a simple and effective self-adaptive SSDV piezoelectric vibration control circuit. The circuit is applied to a mechanical vibration structure stuck with a piezoelectric element (such as a piezoelectric sheet), can effectively increase the damping of the structure, so that the vibration amplitude of the structure is rapidly reduced, and the damping introduced into the mechanical structure can be matched in real time according to the external vibration intensity, thereby avoiding the instability problem of the traditional SSDV circuit. Referring to fig. 1, the external vibration intensity information is obtained by monitoring the open-circuit voltage amplitude of the piezoelectric plate after the circuit is connected in real time through a vibration intensity extraction module, and the module is composed of a passive envelope detection circuit and an RC low-pass filter. According to the magnitude of the fed-back piezoelectric voltage amplitude, the circuit adjusts the voltage amplitude of two voltage sources with opposite polarities connected in series in the LC resonance circuit in real time, so that the continuous and stable operation of the system is ensured. Compared with the traditional piezoelectric vibration control circuit, the self-adaptive SSDV piezoelectric vibration control circuit provided by the application has the advantages of simple design and low operation power consumption, can effectively inhibit mechanical structure vibration in a wider frequency band range, and can be realized by using a simple analog electronic device without an additional piezoelectric sheet or a laser displacement sensor.
Referring to fig. 2, in one embodiment of the present application, an adaptive voltage source synchronous switching damping piezoelectric vibration control circuit includes:
the piezoelectric element is arranged on the controlled structure and can be a piezoelectric sheet;
the adjustable voltage source with opposite polarity comprises a first adjustable voltage source and a second adjustable voltage source, and the second adjustable voltage source and the first adjustable voltage source have the same voltage amplitude and opposite polarity;
the vibration intensity extraction module comprises a passive envelope detection circuit and a voltage division circuit connected with the envelope detection circuit, wherein the envelope detection circuit is used for obtaining a voltage value of the piezoelectric element, and the voltage division circuit is used for dividing the voltage output by the envelope detection circuit and outputting the divided voltage to the first adjustable voltage source so that the ratio of the voltage amplitude of the first adjustable voltage source to the voltage value of the piezoelectric element is a fixed value;
an inductor L connected with the second end of the piezoelectric element;
positive and negative peak switches, including positive and negative peak switches; the positive peak switch is connected with the second adjustable voltage source and is used for being closed when the voltage value of the piezoelectric element reaches the maximum value (namely the absolute value maximum value of positive voltage), so that the inductor L and the piezoelectric element are communicated with the second adjustable voltage source through the positive peak switch, and an LC resonance circuit is formed to realize voltage overturning of the piezoelectric element; the negative peak switch is connected with the first adjustable voltage source and is used for being closed when the voltage value of the piezoelectric element reaches a minimum value (namely the absolute value maximum value of negative voltage), so that the inductor L and the piezoelectric element are communicated with the first adjustable voltage source through the negative peak switch, and an LC resonance circuit is formed to realize voltage overturning of the piezoelectric element.
Wherein the fixed value is (1-gamma)/(1+gamma), gamma is a voltage turnover coefficient, and the value is between 0 and 1, and is mainly determined by the quality factor of the LC resonance circuit. Referring specifically to fig. 3 (the dotted line box and the arrow in fig. 3 indicate that the graph in the dotted line box at the end of the arrow is an enlargement of the graph in the dotted line box at the beginning of the arrow), when the positive peak switch is closed, the voltage V across the piezoelectric element P Reaching a maximum value V M At this time, the strain (displacement of the controlled structure) of the piezoelectric element also reaches the maximum value, and the voltage V across the piezoelectric element P In half LC resonance period t of LC resonance circuit i Inner slave V M Overturn to-V m ，V M And V is equal to m The following relational expression (1) is satisfied:
(V M +V S )γ＝V m -V S (I)
wherein V is S Is the voltage amplitude of the first adjustable voltage source.
According to the self-adaptive voltage source synchronous switch damping piezoelectric vibration control circuit, according to the linear relation between the piezoelectric voltage amplitude of the piezoelectric element and the vibration intensity of the controlled structure and the voltage amplitude of the first adjustable voltage source after the self-adaptive SSDV vibration control circuit is connected, the passive envelope detection circuit and the voltage division circuit are adopted to realize the real-time regulation and control of the voltage amplitudes of the first and second adjustable voltage sources, so that a laser displacement sensor or an additional piezoelectric sheet is not needed to sense the vibration intensity, and the circuit is simple in structure and low in cost.
In one embodiment of the present application, the envelope detection circuit includes a diode D1 and a capacitor C2, wherein a cathode of the diode D1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the second end of the piezoelectric element, and an anode of the diode D1 is connected to the first end of the piezoelectric element.
In one embodiment of the present application, the vibration intensity extraction module further comprises a voltage divider connected to the envelope detection circuitA low-pass filter between the paths for smoothing the voltage V at two ends of the piezoelectric element extracted by the envelope detection circuit in real time P Is due to LC resonance. In one embodiment of the present application, the low-pass filter is an RC low-pass filter, and includes a resistor R3 and a capacitor C1 connected to each other, where one end of the resistor R3 is connected to the cathode of the diode D1, and the other end is connected to one end of the capacitor C1 and a voltage dividing circuit.
In one embodiment of the application, the voltage dividing circuit comprises a resistor R1 and a resistor R2 which are connected in series, the ratio of the voltage output by the voltage dividing circuit to the voltage input by the voltage dividing circuit is R2/(R1+R2), and the amplitude V of the first and the second adjustable voltage sources can be obtained according to the reasonable selection of the resistance values of the resistor R1 and the resistor R2 S And the piezoelectric voltage amplitude V of the piezoelectric element M Is an optimal ratio of (a) to (b).
In one embodiment of the present application, the first adjustable voltage source includes a voltage follower, and an input terminal of the voltage follower is connected to an output terminal of the voltage dividing circuit. In one embodiment of the present application, the voltage follower includes an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to an output terminal of the voltage dividing circuit, and an inverting input terminal of the operational amplifier U1 is connected to an output terminal of the operational amplifier U1.
In one embodiment of the application, the second adjustable voltage source comprises an inverting amplifier. In one embodiment of the present application, the inverting amplifier includes an operational amplifier U2, a resistor R4, and a resistor R5, wherein the resistor R4 is connected between the output terminal of the operational amplifier U1 and the inverting input terminal of the operational amplifier U2, and the resistor R5 is connected between the inverting input terminal of the operational amplifier U2 and the output terminal of the operational amplifier U2.
In one embodiment of the application, the positive and negative peak switch adopts a bipolar transistor and a small capacitor C3 (with smaller capacitance value) to form a passive peak detection circuit, and the second end of the capacitor C3 is connected with the second end of the piezoelectric element. In one embodiment of the present application, the positive peak switch includes a PNP transistor Q2 and an NPN transistor Q4, a base of the PNP transistor Q2 is connected to the first end of the piezoelectric element and a collector of the NPN transistor Q4, an emitter of the PNP transistor Q2 is connected to the first end of the capacitor C3, a collector of the PNP transistor Q2 is connected to the base of the NPN transistor Q4, and an emitter of the NPN transistor Q4 is connected to the second adjustable voltage source. The negative peak switch comprises an NPN triode Q1 and a PNP triode Q3, wherein a base electrode of the NPN triode Q1 is connected with the first end of the piezoelectric element, an emitter electrode of the NPN triode Q1 is connected with the first end of the capacitor C3, a collector electrode of the NPN triode Q1 is connected with the base electrode of the PNP triode Q3, a collector electrode of the PNP triode Q3 is connected with the first end of the piezoelectric element, and an emitter electrode of the PNP triode Q3 is connected with the first adjustable voltage source.
The circuit principle of the circuit shown in fig. 2 is described below: please see fig. 2 and 3, when the voltage V across the piezoelectric plate P In the positive half-cycle, the piezoelectric patch charges the small capacitor C3 through the base and emitter of bipolar transistor Q1. When the strain of the piezoelectric sheet (i.e. the displacement of the controlled structure) reaches a maximum value, the voltage V P Also reach maximum value V M At this time, the voltage value across the capacitor C3 is equal to V M -V be (V be Which is the voltage between the base and the emitter of transistor Q1). With the piezoelectric sheet beginning to move reversely, the voltage V P Start to decrease when V P Reduced to V M -2V be When transistor Q2 is activated, its emitter and collector start to conduct, current then flows from capacitor C3 to the base of transistor Q4, the collector and emitter of transistor Q4 conduct, i.e. the positive peak switch is closed, the piezoelectric plate and the output of operational amplifier U2 and inductor L form an LC resonant circuit, piezoelectric voltage V P In half LC resonance period t i Inner slave V M Overturn to-V m . When the voltage across the piezoelectric patch enters the negative half-cycle, the operation is similar to that of the positive half-cycle, and will not be repeated here. The flipping of the piezoelectric voltage is not perfect due to the loss of the actual LC resonant circuit. V (V) M And V is equal to m The relation of (2) satisfies the above relation (1), wherein gamma is the voltage inversion coefficient, and the value is between 0 and 1, and is mainly determined by the quality factor of the LC resonance circuit, V S Is a series voltage sourceI.e. the absolute value of the voltages at the outputs of the operational amplifiers U1 and U2. Meanwhile, according to the principle of conservation of charge, we can obtain the relation (2):
wherein alpha is a piezoelectric factor, C P Equivalent internal capacitance for piezoelectric plate. The two sub-components (1) and (2) are combined to obtain the vibration displacement u M Functional relation (3):
we have found that when V S And V M When the relation (4) is satisfied, the vibration amplitude u M Decreasing to zero.
Therefore, the stability problem of the traditional SSDV can be effectively avoided by only obtaining the peak value of the piezoelectric voltage in real time when the self-adaptive SSDV piezoelectric vibration control circuit operates and setting the amplitude of the first and second adjustable voltage sources to be slightly smaller than (1-gamma)/(1+gamma) of the peak value voltage, so that the vibration intensity is monitored and fed back without additionally arranging a piezoelectric sheet or a laser displacement sensor.
In the embodiment shown in fig. 2, the envelope detector consisting of diode D1 and capacitor C2 extracts the voltage V across the piezoelectric patch in real time P Is a function of the magnitude of (a). Because of the influence of LC resonance, the voltage signal extracted by the envelope detector contains glitches caused by LC resonance. In order to eliminate the influence of the glitch voltage, an RC low-pass filter composed of a resistor R3 and a capacitor C1 is used for smoothing the extracted voltage envelope signal. The voltage dividing circuit composed of the resistors R1 and R2 is used for setting the amplitude V of the first and second adjustable voltage sources S And the piezoelectric voltage amplitude V of the piezoelectric element M Is an optimal ratio of (a) to (b). The voltage follower configured by the operational amplifier U1 divides the voltageThe voltage output by the circuit is buffered to provide V with a sufficiently large current value S Signal, realize the amplification of piezoelectricity voltage. Resistors R4, R5 and op-amp U2 form an inverting amplifier to generate a negative V of sufficiently large current value S Amplification of the piezoelectric voltage is also achieved. Fig. 3 illustrates exemplary waveforms for steady state operation of the adaptive SSDV piezoelectric vibration control circuit in one embodiment. When the piezoelectric voltage (or structural displacement) reaches a maximum or minimum, the corresponding peak switch is closed, forming an LC resonant circuit. The energy in the piezoelectric sheet is instantaneously extracted into the inductor L, and the energy in the inductor L is instantaneously reversely charged into the piezoelectric sheet, and meanwhile, the first or the second adjustable voltage source provides partial charge again, so that the piezoelectric voltage is turned to a higher voltage value.
It is noted that the collector of transistor Q2 and the base of transistor Q4 in fig. 2 are not connected at the intersection (with the collector of transistor Q3), and the emitter of transistor Q2 and the capacitor C3 are not connected at the intersection (with the base of transistor Q1). In the embodiment shown in fig. 2, the inductor L is not connected to the ground at one end of the capacitor C3, the non-inverting input of the operational amplifier U2 is grounded, the capacitor C1 is not connected to the ground at one end of the resistor R3, and the resistor R2 is not connected to the ground at one end of the resistor R1.
Fig. 4 illustrates a graph of energy cycling during steady state operation of the adaptive SSDV piezoelectric vibration control circuit in one embodiment. The area of the parallelogram multiplied by the piezoelectric power factor alpha is equal to the energy flowing from the piezoelectric patch into the circuit during one vibration cycle.
Fig. 5 shows a comparison of simulation results of an adaptive SSDV piezoelectric vibration control circuit and a conventional SSDV according to an embodiment. Shown is the absolute value of damping (i.e., amplitude attenuation in dB) for an adaptive SSDV piezoelectric vibration control circuit and a conventional SSDV at different vibration excitation force magnitudes for one embodiment of the present application at the structural resonant frequency. The self-adaptive SSDV of the embodiment of the application basically keeps a constant damping no matter how the vibration exciting force changes, the single-mode inhibition degree reaches about-20 dB, and the vibration of a controlled structure can be effectively inhibited. Whereas the damping magnitude of conventional SSDV decreases with increasing excitation force. On the left side of the normalized force equal to 1, the damping of the conventional SSDV is stronger because the voltage value of the voltage source remains unchanged in the conventional SSDV, but when the excitation force is reduced to a certain extent, the conventional SSDV will appear unstable. On the right side of the normalized force equal to 1, the adaptive SSDV of embodiments of the present application can provide greater damping. The whole self-adaptive SSDV piezoelectric vibration control circuit of the embodiment of the application is built by a simple analog device, does not need an additional piezoelectric sheet or a laser displacement sensor to sense the vibration intensity in real time, and has the advantages of simple design, low power consumption and low price.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and for brevity, all of the possible combinations of the technical features of the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (6)
1. An adaptive voltage source synchronous switch damping piezoelectric vibration control circuit, comprising:
a piezoelectric element for being arranged on the controlled structure;
a first adjustable voltage source;
the second adjustable voltage source is the same as the first adjustable voltage source in voltage amplitude and opposite in polarity;
the vibration intensity extraction module comprises an envelope detection circuit and a voltage division circuit connected with the envelope detection circuit, wherein the envelope detection circuit is used for obtaining the voltage value of the piezoelectric element, and the voltage division circuit is used for dividing the voltage output by the envelope detection circuit and outputting the divided voltage to the first adjustable voltage source so that the ratio of the voltage amplitude of the first adjustable voltage source to the voltage value of the piezoelectric element is a fixed value; the vibration intensity extraction module further comprises a low-pass filter connected between the envelope detection circuit and the voltage division circuit; the low-pass filter is an RC low-pass filter and comprises a resistor R3 and a capacitor C1 which are connected with each other; the voltage dividing circuit comprises a resistor R1 and a resistor R2 which are connected in series, wherein one end of the resistor R1, which is not connected with the resistor R2, is connected with the resistor R3 and the capacitor C1, and one end of the resistor R1, which is connected with the resistor R2, is the output end of the voltage dividing circuit;
an inductor L connected with the second end of the piezoelectric element;
the positive peak switch and the negative peak switch are connected with the second adjustable voltage source and are used for being closed when the voltage value of the piezoelectric element reaches the maximum value, so that the inductor L and the piezoelectric element are communicated with the second adjustable voltage source through the positive peak switch, and an LC resonant circuit is formed to realize voltage overturning of the piezoelectric element; the negative peak switch is connected with the first adjustable voltage source and is used for being closed when the voltage value of the piezoelectric element reaches a minimum value, so that the inductor L and the piezoelectric element are communicated with the first adjustable voltage source through the negative peak switch, and an LC resonance circuit is formed to realize voltage overturning of the piezoelectric element; the positive and negative peak switch further comprises a capacitor C3, and a second end of the capacitor C3 is connected with a second end of the piezoelectric element;
the positive peak switch comprises a PNP triode Q2 and an NPN triode Q4, wherein the base electrode of the PNP triode Q2 is connected with the first end of the piezoelectric element and the collector electrode of the NPN triode Q4, the emitter electrode of the PNP triode Q2 is connected with the first end of the capacitor C3, the collector electrode of the PNP triode Q2 is connected with the base electrode of the NPN triode Q4, and the emitter electrode of the NPN triode Q4 is connected with the second adjustable voltage source;
the negative peak switch comprises an NPN triode Q1 and a PNP triode Q3, wherein the base electrode of the NPN triode Q1 is connected with the first end of the piezoelectric element, the emitter electrode of the NPN triode Q1 is connected with the first end of the capacitor C3, the collector electrode of the NPN triode Q1 is connected with the base electrode of the PNP triode Q3, the collector electrode of the PNP triode Q3 is connected with the first end of the piezoelectric element, and the emitter electrode of the PNP triode Q3 is connected with the first adjustable voltage source;
wherein the fixed value is (1-gamma)/(1+gamma), and gamma is a voltage inversion coefficient.
2. The adaptive voltage source synchronous switch damping piezoelectric vibration control circuit according to claim 1, wherein the envelope detection circuit comprises a diode D1 and a capacitor C2, wherein a cathode of the diode D1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to the second end of the piezoelectric element, and an anode of the diode D1 is connected to the first end of the piezoelectric element.
3. The adaptive voltage source synchronous switch damping piezoelectric vibration control circuit according to claim 1, wherein the first adjustable voltage source comprises a voltage follower, an input of the voltage follower being connected to an output of the voltage divider circuit.
4. The adaptive voltage source synchronous switch damping piezoelectric vibration control circuit according to claim 3, wherein the voltage follower comprises an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to an output terminal of the voltage dividing circuit, and an inverting input terminal of the operational amplifier U1 is connected to an output terminal of the operational amplifier U1.
5. The adaptive voltage supply synchronous switch damping piezoelectric vibration control circuit of claim 3 wherein said second adjustable voltage supply comprises an inverting amplifier.
6. The adaptive voltage source synchronous switch damping piezoelectric vibration control circuit according to claim 5, wherein the inverting amplifier comprises an operational amplifier U2, a resistor R4 and a resistor R5, wherein the resistor R4 is connected between the output terminal of the operational amplifier U1 and the inverting input terminal of the operational amplifier U2, and the resistor R5 is connected between the inverting input terminal of the operational amplifier U2 and the output terminal of the operational amplifier U2.
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