Unidirectional circuit piezoelectric beam with broadband vibration attenuation

Abstract

A unidirectional piezoelectric beam with broadband vibration attenuation includes a beam substrate and several sub-units sequentially disposed thereon. Each sub-unit includes: a piezoelectric sensing unit disposed on the upper and lower surfaces of one side of the beam substrate; a piezoelectric actuating unit disposed on the upper and lower surfaces of the other side of the beam substrate; and a unidirectional amplification circuit connecting the piezoelectric sensing unit and the piezoelectric actuating unit on the upper and lower surfaces of both sides, respectively. This invention achieves directional control and broadband attenuation of beam structure vibration energy by constructing an asymmetric electromechanical coupling path. Furthermore, different control strategies can be used to localize vibration energy in different directions, making it suitable for beam structure vibration control and vibration reduction / noise reduction applications.

Description

Technical Field

[0001] This invention relates to a technology in the field of vibration control, specifically a unidirectional piezoelectric beam with broadband vibration attenuation. Background Technology

[0002] Beam structures are among the most common load-bearing foundation components in engineering, widely used in aerospace, civil engineering, shipbuilding, and precision equipment. Under complex excitation conditions, beam structures are prone to low-frequency broadband vibrations, which can affect structural stability, service accuracy, and operational reliability. Existing piezoelectric control methods mostly rely on local resonance or narrowband feedback, resulting in limited control bandwidth. Existing structural control methods also depend on specific geometric forms, leading to insufficient adjustment flexibility. For beam structures that require simultaneous consideration of broadband attenuation, propagation direction control, and structural compactness, existing technologies still suffer from limited control range, insufficient adaptability, and complex implementation. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention proposes a unidirectional piezoelectric beam with broadband vibration attenuation. By introducing a unidirectional amplifier circuit between the piezoelectric sensing unit and the piezoelectric actuation unit, an asymmetric electromechanical coupling path is constructed, thereby achieving broadband vibration attenuation and directional propagation control of the beam structure. It also features a compact structure and convenient adjustment.

[0004] This invention is achieved through the following technical solution:

[0005] This invention relates to a unidirectional piezoelectric beam with broadband vibration attenuation, comprising: a beam base and a plurality of sub-units sequentially disposed thereon. Each sub-unit includes: a piezoelectric sensing unit disposed on the upper and lower surfaces of one side of the beam base, a piezoelectric actuation unit disposed on the upper and lower surfaces of the other side of the beam base, and a unidirectional amplifier circuit connecting the piezoelectric sensing unit and the piezoelectric actuation unit on the upper and lower surfaces respectively. The piezoelectric sensing units on the upper and lower surfaces are respectively connected to the non-inverting input terminal of the unidirectional amplifier circuit, and the output terminal of the unidirectional amplifier circuit is connected to the piezoelectric actuation unit on the upper and lower surfaces. The piezoelectric sensing unit senses the vibration state of the beam base and outputs an induced voltage signal, and the piezoelectric actuation unit receives the amplified voltage signal and drives the beam base to generate a vibration response.

[0006] The unidirectional amplifier circuit includes: an operational amplifier, an input resistor, a feedback resistor, and a grounding resistor, and its amplification factor satisfies the following conditions: ,in: For feedback resistor, For input resistance, This is the grounding resistance.

[0007] This invention relates to a method for implementing a unidirectional circuit piezoelectric beam as described above, comprising:

[0008] Step 1: Based on the vibration control requirements of the target beam structure, determine the frequency range to be controlled, the excitation direction, the number of piezoelectric sensing units and piezoelectric actuating units, and the geometric parameters of the beam matrix and piezoelectric sheet.

[0009] Step 2: Based on the target requirements determined in Step 1, set the connection method, gain magnitude and gain polarity of the unidirectional amplifier circuit so that the output signal of the piezoelectric sensing unit is amplified and applied to the piezoelectric actuating unit to form asymmetric coupling control in the preset direction.

[0010] Step 3: Based on the structural and circuit parameters obtained in Step 2, establish a numerical model or experimental system to verify whether the frequency response, vibration transmission characteristics and broadband attenuation effect of the piezoelectric beam under different excitation directions meet the preset requirements.

[0011] This invention relates to an application of the aforementioned unidirectional circuit piezoelectric beam, which is used for beam structure vibration control, elastic wave directional regulation, and vibration reduction and noise reduction. Technical effect

[0012] This invention achieves directional control and broadband attenuation of beam structure vibration energy by constructing an asymmetric coupling relationship between a piezoelectric sensing unit, a piezoelectric actuation unit, and a unidirectional amplification circuit. Compared with existing technologies, this invention can achieve broadband vibration suppression and propagation direction control without significantly altering the main structure of the beam. It has the advantages of compact structure, adjustable parameters, and strong engineering adaptability, providing a new approach for broadband vibration control of beam structures and possessing significant engineering application value. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 for Figure 1 Schematic diagram of a partially enlarged unit;

[0015] Figure 3 This is a schematic diagram of the unidirectional amplifier circuit of the present invention;

[0016] Figure 4 The frequency response curve shown in the embodiment;

[0017] Figure 5 This is a schematic diagram of the left local vibration energy distribution in the embodiment;

[0018] Figure 6 This is a schematic diagram of the right local vibration energy distribution in the embodiment;

[0019] In the diagram: 1. Beam base; 2. Piezoelectric sensing unit; 3. Piezoelectric actuation unit; 4. Unidirectional amplifier circuit. Detailed Implementation

[0020] like Figure 1 As shown, this embodiment illustrates a unidirectional piezoelectric beam unit, comprising: a beam substrate 1, piezoelectric sensing units 2 disposed on the upper / lower surfaces of one side of the beam substrate 1, piezoelectric actuation units 3 disposed on the upper / lower surfaces of the other side of the beam substrate 1, and a unidirectional amplifier circuit 4 connecting the piezoelectric sensing units 2 and the piezoelectric actuation units 3 on the upper / lower surfaces respectively. The piezoelectric sensing units 2 on the upper / lower surfaces are respectively connected to the input terminals of the unidirectional amplifier circuit 4, and the output terminals of the unidirectional amplifier circuit 4 are connected to the piezoelectric actuation units 3 on the upper / lower surfaces. The piezoelectric sensing units 2 are used to sense the vibration state of the beam substrate 1 and output an induced voltage signal, while the piezoelectric actuation units 3 are used to receive the amplified voltage signal and drive the beam substrate 1 to generate a vibration response.

[0021] Both the piezoelectric sensing unit 2 and the piezoelectric actuation unit 3 are attached to the surface of the beam substrate 1 and form an electromechanical coupling structure with the beam substrate 1.

[0022] In this embodiment, the beam base 1 is preferably a metal aluminum alloy beam.

[0023] The piezoelectric sensing unit 2 and piezoelectric actuation unit 3 use piezoelectric sheets that are 100 mm long, 15 mm wide, and 1 mm thick; the beam substrate 1 corresponding to the piezoelectric sheet is 2 mm thick. Multiple piezoelectric sensing units 2 and piezoelectric actuation units 3 can be periodically arranged along the beam length direction, with a 10 mm interval between two units, forming the control area of ​​the piezoelectric beam.

[0024] like Figure 3 As shown, the unidirectional amplifier circuit 4 includes an operational amplifier, an input resistor, a feedback resistor, and a grounding resistor. The induced voltage signal output by the piezoelectric sensing unit 2 is amplified by the unidirectional amplifier circuit 4 and then input to the piezoelectric actuation unit 3. The amplification factor is determined by adjusting the ratio of the feedback resistor to the input resistor.

[0025] like Figure 2 As shown, this embodiment relates to a unidirectional piezoelectric beam with broadband vibration attenuation, comprising: a beam base 1 and a plurality of unidirectional piezoelectric beam units disposed thereon, wherein: piezoelectric sensing units 2 and piezoelectric actuation units 3 are arranged alternately on the beam base 1, and the bandwidth and attenuation intensity can be effectively adjusted by changing the number of units, the spacing distance and the gain parameters of the unidirectional amplifier circuit 4.

[0026] The control frequency range of the unidirectional piezoelectric beam is 10 Hz to 2500 Hz. By adjusting the gain and polarity of the unidirectional amplifier circuit 4, the asymmetric coupling strength and vibration propagation direction of the piezoelectric beam can be changed.

[0027] Through specific experiments, a corresponding piezoelectric beam model was established in numerical simulation software, and its frequency response and spatial vibration distribution were calculated under different excitation directions. Figure 4 As shown, compared with the uncontrolled short-circuit state, the vibration response of the piezoelectric beam is significantly reduced over a wide frequency range after applying unidirectional circuit control; when the control coefficient G increases, a wider effective control bandwidth and a higher vibration attenuation level can be obtained.

[0028] Furthermore, within a wide frequency band, the vibration amplitude suppression rate is as low as one-thousandth of the uncontrolled amplitude, indicating that the piezoelectric beam has good broadband vibration attenuation capability.

[0029] like Figure 5 As shown, using When the control strategy is applied, the vibration energy in the beam is mainly localized to the left boundary, forming a significant energy accumulation zone near the left side. The vibration amplitude in the target area on the right boundary decreases significantly, indicating that the structure can achieve left-side local vibration energy control.

[0030] like Figure 6 As shown, using When the control strategy is applied, the vibration energy in the beam is mainly localized to the right boundary, forming a significant energy accumulation zone near the right side. The vibration amplitude in the target area on the left boundary decreases significantly, indicating that the structure can achieve right-side local vibration energy control.

[0031] By changing the gain polarity or control parameters of the unidirectional amplifier circuit 4, the left local vibration energy distribution and the right local vibration energy distribution can be switched, indicating that the present invention can not only achieve broadband vibration attenuation, but also achieve adjustable control of the local direction of vibration energy.

[0032] Compared with existing technologies, this invention achieves coordinated control of vibration propagation direction and attenuation intensity in beam structures by constructing a unidirectional amplification coupling relationship between the piezoelectric sensing unit 2 and the piezoelectric actuating unit 3. By employing different control strategies, left-region and right-region vibration energy distributions can be achieved separately. Without significantly increasing structural complexity, this invention can obtain a wider effective control bandwidth, making it suitable for vibration suppression and fluctuation control in engineering beam structures.

[0033] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.

Claims

1. A unidirectional piezoelectric beam with broadband vibration damping, characterized in that, include: The beam base consists of a beam matrix and several sub-units sequentially arranged thereon. Each sub-unit includes: a piezoelectric sensing unit disposed on the upper and lower surfaces of one side of the beam matrix; a piezoelectric actuation unit disposed on the upper and lower surfaces of the other side of the beam matrix; and a unidirectional amplifier circuit connecting the piezoelectric sensing unit and the piezoelectric actuation unit on the upper and lower surfaces respectively. The piezoelectric sensing units on the upper and lower surfaces are respectively connected to the non-inverting input terminal of the unidirectional amplifier circuit, and the output terminal of the unidirectional amplifier circuit is connected to the piezoelectric actuation unit on the upper and lower surfaces. The piezoelectric sensing unit senses the vibration state of the beam matrix and outputs an induced voltage signal, while the piezoelectric actuation unit receives the amplified voltage signal and drives the beam matrix to generate a vibration response.

2. The unidirectional piezoelectric beam with broadband vibration attenuation according to claim 1, characterized in that, The unidirectional amplifier circuit includes: an operational amplifier, an input resistor, a feedback resistor, and a grounding resistor, and its amplification factor satisfies the following conditions: ,in: For feedback resistor, For input resistance, This is the grounding resistance.

3. The unidirectional piezoelectric beam with broadband vibration attenuation according to claim 1, characterized in that, The beam substrate is a metal aluminum alloy beam; The piezoelectric sheet used in the piezoelectric sensing unit and piezoelectric actuation unit is 100 mm long, 15 mm wide, and 1 mm thick; the beam substrate corresponding to the piezoelectric sheet is 2 mm thick.

4. The unidirectional piezoelectric beam with broadband vibration attenuation according to claim 1, characterized in that, Multiple piezoelectric sensing units and piezoelectric actuation units are periodically arranged along the length of the beam, with a 10 mm interval between each unit, forming the control area of ​​the piezoelectric beam.

5. A method for implementing a unidirectional piezoelectric beam based on any one of claims 1-4, characterized in that, include: Step 1: Based on the vibration control requirements of the target beam structure, determine the frequency range to be controlled, the excitation direction, the number of piezoelectric sensing units and piezoelectric actuating units, and the geometric parameters of the beam matrix and piezoelectric sheet; Step 2: Based on the target requirements determined in Step 1, set the connection method, gain magnitude and gain polarity of the unidirectional amplifier circuit so that the output signal of the piezoelectric sensing unit is amplified and applied to the piezoelectric actuating unit to form asymmetric coupling control in the preset direction. Step 3: Based on the structural and circuit parameters obtained in Step 2, establish a numerical model or experimental system to verify whether the frequency response, vibration transmission characteristics and broadband attenuation effect of the piezoelectric beam under different excitation directions meet the preset requirements.

6. An application of the unidirectional piezoelectric beam according to any one of claims 1-4, characterized in that, It is used for beam structure vibration control, elastic wave directional regulation, and vibration reduction and noise reduction.

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