Bionic underwater hair sensor based on spiral resonance structure

Abstract

The invention discloses a bionic underwater hair sensor based on a spiral resonance structure. The bionic underwater hair sensor comprises a spiral resonance structure base, top hair vertically arranged on the spiral resonance structure base and a middle sensing element arranged at the bottom of the top hair, the spiral resonant structure base comprises a base, a central block and a spiral structure which is respectively connected with the base and the central block, wherein the shape of the spiral structure is matched with the outer contour of the central block. According to the invention, inspired by the frequency selection characteristic of a biological hair mechanical receptor, a spiral resonant structure is introduced into the hair sensor by adopting a mechanical guiding design method, high-sensitivity sensing of water flow in a specific frequency band can be realized, and high-sensitivity sensing of signals in different frequency bands can be realized by combining sensor units with different parameters.

Description

Technical Field

[0001] The present invention relates to a technology in the field of underwater flow field measurement and resonant sensors, in particular to a bionic underwater hair sensor based on a spiral resonant structure. Background Art

[0002] Hair mechanoreceptors are a typical naturally occurring mechanoreceptor. Existing research on underwater biological hair-like flow sensors focuses on highly sensitive sensor devices using different physical mechanisms, which require high micro-nano processing technology, and the production difficulty and cost are not low. Summary of the Invention

[0003] In response to the above-mentioned shortcomings of the existing technology, the present invention proposes a bionic underwater hair sensor based on a spiral resonance structure. Inspired by the frequency selection characteristics of biological hair mechanical receptors, a mechanically guided design method is adopted to introduce the spiral resonance structure into the hair sensor, which can achieve highly sensitive perception of water flow in a specific frequency band. By combining sensor units with different parameters, highly sensitive perception of signals in different frequency bands can be achieved.

[0004] The present invention is achieved through the following technical solutions:

[0005] The invention relates to a bionic underwater hair sensor based on a spiral resonance structure, comprising a spiral resonance structure base, top hairs vertically arranged thereon, and a middle sensing element arranged at the bottom of the top hairs.

[0006] The spiral resonant structure base comprises a base, a central block and a spiral structure respectively connecting the base and the central block, wherein the shape of the spiral structure matches the outer contour of the central block.

[0007] The cross-sectional shape of the top hair matches the outer contour of the center block. The cross-sectional shape is obtained by collaboratively optimizing the curvature radius of the outer contour of the center block, the contour equation coefficient and the cross-sectional shape of the top hair through finite element simulation technology. This allows the bionic underwater hair sensor based on the spiral resonance structure to maintain a stable response frequency to water flow excitation in the omnidirectional range of 0°-360°, and can control its resonant frequency deviation within ±1Hz, thereby achieving isotropic water flow signal detection performance.

[0008] Technical Effects

[0009] Based on the frequency selection mechanism of real biological water flow sensing structures, the present invention introduces a spiral resonance structure through mechanically guided design, and successfully constructs a bionic hair water flow sensor with frequency selection characteristics. Compared with the existing technology, the present invention shows extremely high perception sensitivity to water flow disturbances near the resonant frequency, and can accurately identify target water flow disturbances even in a strong noise background, while having high output reliability and strong anti-noise ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention;

[0011] Figure 2 The structural size details of the present invention;

[0012] Figure 3 This is a structural diagram of the spiral structure parameter design of the present invention;

[0013] Figure 4 A schematic diagram of the structure of a sensor unit of the present invention combining six different parameters;

[0014] Figure 5 Graphs showing the frequency response outputs of the sensor unit of the present invention with 6 different parameters. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, this embodiment relates to a bionic underwater hair sensor based on a spiral resonance structure, including: a spiral resonance structure base 3, a top hair 1 vertically arranged thereon, and a middle sensing element 2 arranged at the bottom of the top hair 1.

[0016] The cross-sectional shape of the top hair 1 may be, but not limited to, circular, elliptical, etc.

[0017] The helical resonant structure base 3 comprises a base 301 , a central block 302 and a helical structure 303 connecting the base and the central block respectively, wherein the shape of the helical structure 303 matches the outer contour of the central block 302 .

[0018] The cross-sectional shape of the top hair 1 matches the outer contour of the central block 302, so that the bionic underwater hair sensor based on the spiral resonance structure has the same resonance frequency in response to water flow signals in different directions.

[0019] The aforementioned adjustment of the spiral angle, spiral thickness and other parameters of the spiral resonant structure base 3 can regulate the torsional stiffness of the spiral resonant structure base 3, and further adjust the resonant frequency of the bionic underwater hair sensor. Specifically, the finite element simulation technology is used to systematically optimize the parameters such as the spiral angle and spiral thickness. Based on the COMSOL Multiphysics platform, a fluid-structure coupling simulation model is established. Through modal analysis and harmonic response analysis, the quantitative relationship between each parameter and the resonant frequency of the sensor is determined. The parameterized simulation results are shown in FIG. Figure 3 shown.

[0020] The sensor element 2 may be, but is not limited to, a strain gauge, a piezoresistive sensitive element, or a piezoelectric sensitive element.

[0021] The number of sensor elements 2 to be installed needs to be selected based on the directional symmetry of the bionic hair sensor. For a bionic underwater hair sensor with hair 1 having an elliptical cross-section and a spiral resonant structure base 3, two sensor elements 2 need to be arranged corresponding to the major and minor axes of the elliptical cross-section in order to meet the measurement requirements of water flow in all directions; while for a bionic underwater hair sensor with hair 1 having a circular cross-section and a spiral resonant structure base 3, due to its structural symmetry, only one sensor element needs to be arranged to meet the measurement requirements of water flow in all directions.

[0022] When the external water flow acts on the bionic underwater hair sensor, the hair 1 is deflected by the water flow and transmits mechanical signals to the sensor element 2 and the spiral resonant structure base 3. If the frequency of the water flow is near the resonant frequency of the bionic underwater hair sensor, the bionic underwater hair sensor resonates, and the output of the sensor element 2 will be greatly enhanced due to the resonance effect, which is reflected in the high sensitivity to the external water flow signal.

[0023] The resonant frequency of the hair sensor can be customized according to different usage scenarios, so as to achieve targeted and highly sensitive measurement of water flow information in different frequency bands.

[0024] The bionic underwater hair sensor with a combination of different structural parameters can achieve highly sensitive and synchronous measurement of water flows in multiple frequency bands.

[0025] When combining bionic underwater hair sensors with different structural parameters, it is necessary to configure the spacing between different bionic underwater hair sensors to avoid coupling interference between different bionic underwater hair sensors when sensing external water flow.

[0026] This embodiment relates to a method for preparing the above-mentioned bionic underwater hair sensor, comprising:

[0027] Step 1. Processing and preparing hair 1, sensor element 2, and spiral resonant structure base 3;

[0028] Step 2. Glue and install the sensor element 2 onto the spiral resonant structure base 3 and make sure it is waterproof.

[0029] Step 3: Glue and fix the hair 1 and the spiral resonant structure base 3.

[0030] like Figure 2 As shown, the length of the hair 1 is l1. Changing the length of the hair 1 can regulate the magnitude of the torque acting on the base when the bionic hair sensor receives water flow stimulation and the overall stiffness of the hair 1 itself; the basic parameters of the spiral resonant structure base 3 are the spiral angle θ1, the spiral structure thickness t and other parameters. Adjusting the spiral angle θ1, the spiral structure thickness t and other parameters can regulate the torsional stiffness of the spiral resonant structure base 3. In combination with the parameters of the hair 1, the resonant frequency of the underwater hair sensor can be further regulated, thereby realizing customized adjustment of the resonant frequency of the underwater hair sensor according to the actual measurement environment and measurement requirements.

[0031] like Figure 4 As shown, a sensor array based on the above-mentioned bionic underwater hair sensor includes: six bionic underwater hair sensors stacked in six centers and arranged on the same base, wherein: the six sensor units are evenly arranged in a regular hexagonal form and mounted on a circular plane plate 7, and different sensor units have different sensitive frequency ranges.

[0032] Each bionic underwater hair sensor maintains a certain distance from each other to minimize coupling interference between them when sensing external water flow. When encountering a water flow of a specific frequency, the sensor unit with a resonant frequency close to that frequency will have a significantly larger output, which is manifested as a local resonance characteristic. The various sensor units cooperate with each other to achieve the array's highly sensitive perception of multi-frequency water flow. When water flow stimuli are transmitted in an aquatic environment, they will rapidly attenuate as the distance from the water source increases. Therefore, a position adjustment device can be added to the sensor array to enable each sensor unit to actively approach the incoming water flow stimulus, thereby sensing water flow stimuli of sufficient intensity and ensuring perception accuracy.

[0033] After specific actual experiments, the length, width and depth are 600*600*600 mm 3 A dipole exciter is placed above the pool as the experimental water flow input. At different vibration frequencies, the dipole is controlled to maintain a velocity amplitude of 50 mm / s, and the distance between the dipole and each sensor unit hair 1 is kept at 15 mm. The output results corresponding to different units are as follows Figure 5 As shown in the figure, the control group is a hair sensor without a spiral resonant structure. It can be seen that the output of the sensor unit with different parameters near its resonant frequency is significantly higher than that of the control group.

[0034] Compared to existing technologies, this invention significantly improves sensor performance by innovatively combining the frequency-selective properties of biological flow-sensing structures with a mechanically guided design approach. Specifically, this design places the sensor's resonant frequency within the frequency range of primary flow disturbances. This resonance effect, based on the resonance effect, increases the sensitivity of this invention several-fold in sensing flow signals within specific frequency bands compared to similar sensors without a helical structure.

[0035] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principles and purpose of the present invention. The scope of protection of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. All implementation schemes within its scope shall be subject to the constraints of the present invention.

Claims

1. A bionic underwater hair sensor based on a spiral resonance structure, characterized in that: include: A spiral resonant structure base, top hairs vertically arranged thereon, and a middle sensing element arranged at the bottom of the top hairs; The spiral resonant structure base comprises a base, a central block and a spiral structure respectively connecting the base and the central block, wherein the shape of the spiral structure matches the outer contour of the central block.

2. The bionic underwater hair sensor based on the spiral resonance structure according to claim 1 is characterized in that: The cross-sectional shape of the top hair matches the outer contour of the central block, so that the bionic underwater hair sensor based on the spiral resonance structure has the same resonance frequency in response to water flow signals in different directions.

3. The bionic underwater hair sensor based on the spiral resonance structure according to claim 1 or 2, characterized in that: The cross-sectional shape of the top hair is obtained by collaboratively optimizing the curvature radius of the outer contour of the center block, the contour equation coefficient and the cross-sectional shape of the top hair using finite element simulation technology.

4. A sensing method based on the bionic underwater hair sensor according to any one of claims 1 to 3, characterized in that: include: Step 1: Process and prepare hair, sensor element, and spiral resonant structure base; Step 2: Glue and install the sensor element on the spiral resonant structure base and make sure it is waterproof. Step 3: Glue and fix the hair and the spiral resonant structure base.

Images