Method for effectively reducing the resonant frequency of a bending disc transducer and structure thereof

Abstract

The present application relates to the technical field of disc transducer preparation, and particularly relates to a method for effectively reducing the resonance frequency of a curved disc transducer and a structure thereof. After a metal disc is subjected to sanding treatment, the metal disc is bonded with two piezoelectric ceramic discs to form a three-lamella structure. The three-lamella structure is connected with a metal base through elastic material, and the three are bonded together through epoxy adhesive. Eight through holes are formed in the metal disc and the elastic material at corresponding positions, and eight threaded holes are reserved in the metal base at corresponding positions. During the bonding process of the three, screws are installed in the eight through holes, the lower ends of the screws are screwed into the threaded holes, and a level is used to ensure that the metal disc is horizontal after the screws are tightened. The un-bonded surfaces of the piezoelectric ceramic discs are respectively welded with wires as anodes, and a small threaded hole is formed in the metal disc to fix a terminal post. Selecting elastic material with low Young's modulus and / or increasing the thickness of the elastic material can effectively reduce the resonance frequency of the curved disc transducer.

Description

Technical Field

[0001] This invention relates to the field of disk transducer manufacturing technology, and in particular to a method and structure for effectively reducing the resonant frequency of a bent disk transducer. Background Technology

[0002] With the development of marine exploration, anti-submarine detection, and underwater acoustic communication technologies, the demand for deep-water, low-frequency, small-size, broadband, and high-power transmitting transducers is becoming increasingly urgent. Transducers that completely meet all these requirements do not exist; certain trade-offs in performance are necessary. Curved disk transducers, characterized by low frequency, small size, light weight, and simple structure, can be used as active buoy sonar, underwater acoustic transponders, underwater acoustic communication, and underwater acoustic target simulators, offering a wide range of applications and market demand. The resonant frequency of a curved disk transducer is related to the diameter-to-thickness ratio of the metal disk and the piezoelectric ceramic. To lower the resonant frequency, two methods are generally adopted: 1. Reducing the thickness of the metal plate and piezoelectric ceramic, which leads to reduced operating depth and voltage. 2. Increasing the diameter of the metal plate and piezoelectric ceramic, but due to limitations in piezoelectric ceramic manufacturing processes, large-diameter piezoelectric ceramic disks are difficult to manufacture and costly. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention discloses a method and structure for effectively reducing the resonant frequency of a curved disk transducer. This invention provides a simple and reliable method for reducing the resonant frequency of a curved disk transducer without changing its dimensions.

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

[0005] A method for effectively reducing the resonant frequency of a curved disk transducer includes the following steps:

[0006] Step 1: After the metal disc is frosted, it is bonded together with two piezoelectric ceramic discs to form a triple-layered sheet;

[0007] Step 2: The three-layer sheet is connected to the metal base by an elastic material, and the three are bonded together with epoxy adhesive; the thickness and / or Young's modulus of the above-mentioned elastic material can be adjusted;

[0008] Step 3: Eight through holes are made at the corresponding positions of the metal circular plate and the elastic material, and eight threaded holes are reserved at the corresponding positions of the metal base;

[0009] Step 4: During the bonding process of the three components in Step 2 above, install the screws into the eight through holes, tighten the lower end of the screws into the threaded holes, and use a level to ensure that the metal plate is horizontal after the screws are tightened.

[0010] Step 5: Weld wires to the unbonded sides of the piezoelectric ceramic discs as positive electrodes. Make a small threaded hole in the metal plate to fix the terminal block. Weld wires to the terminal block as negative electrodes.

[0011] Step 6: Connect the positive and negative wires to the cable, and finally lead the cable out through the cable fixing cylinder. Finally, use a polyurethane sealing layer to make the whole system watertight.

[0012] Preferably, the screw is a tooling screw, which is used to provide a certain pressure during the bonding process to ensure the firmness of the bond.

[0013] Preferably, in step 4, after the epoxy adhesive has completely dried, the eight screws are removed.

[0014] Preferably, in step 2, an elastic material with a low Young's modulus and / or an elastic material with increased thickness is selected to reduce the resonant frequency of the bent disk transducer.

[0015] The present invention also provides the following technical solution: a transducer structure prepared by the above-described method for effectively reducing the resonant frequency of a bent disk transducer, the structure comprising a metal base, a metal disc, an elastic material, a terminal block, a cable fixing cylinder, a piezoelectric ceramic disc, a polyurethane sealing layer, and screws.

[0016] The present invention has the following beneficial effects:

[0017] The method of the present invention can effectively reduce the resonant frequency of the bent disk transducer without changing the size of the bent disk transducer. This can be achieved by adjusting the Young's modulus or the thickness of the elastic material between the bent vibrating metal disk and the metal base, selecting an elastic material with a low Young's modulus and / or increasing the thickness of the elastic material (the lower the Young's modulus, the more significant the effect of increasing the thickness on reducing the resonant frequency). Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the transducer structure of the present invention.

[0020] Figure 2 This is an external view of the transducer structure of the present invention.

[0021] Figure 3The simulation results curves show the changes in the Young's modulus of the elastic material according to the present invention.

[0022] Figure 4 The simulation results curves for changing the thickness of the elastic material in this invention are shown in the figure.

[0023] In the diagram: 1-Metal base, 2-Metal circular plate, 3-Elastic material, 4-Terminal, 5-Cable fixing cylinder, 6-Piezoelectric ceramic disc, 7-Polyurethane sealing layer, 8-Screw. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-4 This invention provides a technical solution for effectively reducing the resonant frequency of a curved disk transducer, comprising the following steps:

[0026] Step 1: After the metal disc 2 is frosted, it is bonded together with two piezoelectric ceramic discs 6 to form a triple-layered disc;

[0027] Step 2: The three-layer sheet is connected to the metal base 1 through the elastic material 3, and the three are bonded together with epoxy adhesive;

[0028] Step 3: Eight through holes are made at the corresponding positions of the metal circular plate 2 and the elastic material 3, and eight threaded holes are reserved at the corresponding positions of the metal base 1;

[0029] Step 4: During the bonding process of the three components in Step 2 above, install screw 8 into the eight through holes, tighten the lower end of screw 8 into the threaded hole, and use a level to ensure that the metal plate is horizontal after screw 8 is tightened.

[0030] Step 5: Weld wires to the unbonded sides of the piezoelectric ceramic disc 6 as positive electrodes. Make a small threaded hole in the metal plate to fix the terminal 4. Weld wires to the terminal 4 as negative electrodes.

[0031] Step 6: Connect the positive and negative wires to the cable, and finally lead the cable out through the cable fixing cylinder 5. Finally, use the polyurethane sealing layer 7 to make the whole watertight.

[0032] The screw 8 is a tooling screw 8, whose function is to provide a certain pressure for the bonding process and ensure the firmness of the bond.

[0033] In step 4, once the epoxy adhesive is completely dry, the eight screws 8 can be removed.

[0034] The present invention also provides the following technical solution: a transducer structure prepared by the above-mentioned method for effectively reducing the resonant frequency of a bent disk transducer, the structure being composed of a metal base 1, a metal circular plate 2, an elastic material 3, a terminal block 4, a cable fixing cylinder 5, a piezoelectric ceramic disc 6, a polyurethane sealing layer 7, and screws 8.

[0035] The working principle of the method of this invention is as follows: the boundary conditions of a curved disk transducer generally include three types: simply supported, fixed supported, and free. Figure 1 , Figure 2 This structure is classified as a simply supported structure. However, as the Young's modulus of the elastic material 3 decreases or the elastic material 3 becomes thicker, the simply supported boundary will transition to a free boundary, thereby reducing the resonant frequency of the transducer.

[0036] Depend on Figure 3 and Figure 4 The simulation results show that by adjusting the Young's modulus of the elastic material 3 between the bending vibrating metal disk and the metal base 1 or by adjusting the thickness of the elastic material 3, selecting an elastic material 3 with a low Young's modulus and / or increasing the thickness of the elastic material 3, the resonant frequency of the bending disk transducer can be effectively reduced. Moreover, the study found that the lower the Young's modulus of the elastic material, the more significant the effect of increasing the thickness on reducing the resonant frequency.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for effectively reducing the resonant frequency of a curved disk transducer, characterized in that, Includes the following steps: Step 1: After the metal disc is frosted, it is bonded together with two piezoelectric ceramic discs to form a triple-layered sheet; Step 2: The three-layer sheet is connected to the metal base by an elastic material, and the three are bonded together with epoxy adhesive; the thickness and / or Young's modulus of the above-mentioned elastic material can be adjusted; in Step 2, an elastic material with a low Young's modulus and / or an elastic material with increased thickness is selected to reduce the resonant frequency of the bent disk transducer; and the lower the Young's modulus of the elastic material, the more obvious the effect of increasing the thickness of the elastic material on reducing the resonant frequency. Step 3: Eight through holes are made at the corresponding positions of the metal circular plate and the elastic material, and eight threaded holes are reserved at the corresponding positions of the metal base; Step 4: During the bonding process of the three components in Step 2 above, install the screws into the eight through holes, tighten the lower end of the screws into the threaded holes, and use a level to ensure that the metal plate is horizontal after the screws are tightened. Step 5: Weld wires to the unbonded sides of the piezoelectric ceramic discs as positive electrodes. Make a small threaded hole in the metal plate to fix the terminal block. Weld wires to the terminal block as negative electrodes. Step 6: Connect the positive and negative wires to the cable, and finally lead the cable out through the cable fixing cylinder. Finally, use a polyurethane sealing layer to make the whole system watertight.

2. The method for effectively reducing the resonant frequency of a curved disk transducer as described in claim 1, characterized in that, The screw is a tooling screw, whose function is to provide a certain pressure during the bonding process to ensure the strength of the bond.

3. The method for effectively reducing the resonant frequency of a curved disk transducer as described in claim 1, characterized in that, In step 4, after the epoxy adhesive has completely dried, the eight screws are removed.

4. A transducer structure prepared by means of any one of claims 1-3 for effectively reducing the resonant frequency of a bent disk transducer, characterized in that, The structure consists of a metal base, a metal disc, elastic material, terminal blocks, a cable fixing disc, a piezoelectric ceramic disc, a polyurethane sealing layer, and screws.

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