A postural adjustment metamaterial isolator for an underwater vehicle

Abstract

The application discloses a kind of attitude adjustment metamaterial vibration isolators for underwater vehicle, belong to vibration control and material engineering technical field, it is characterized in that, including outer flange body, inner flange body and metamaterial vibration isolation component;The outer flange body is the circular ring body with circular through-hole, and the inner annular surface of the outer flange body is uniformly distributed with several inner grooves;The inner flange body is the circular ring body with circular through-hole, and the outer annular surface of the inner flange body is uniformly distributed with several outer grooves, the outer groove and inner groove one-to-one corresponding constitute groove cavity, the inner flange body is sleeved in the circular through-hole inside of the outer flange body, and the inner flange body has annular gap between the outer flange ring;The metamaterial vibration isolation component is formed by periodic arrangement of metamaterial base cell, and the metamaterial vibration isolation component is arranged in the groove cavity.This vibration isolator can block the transmission of vibration noise to acoustic sensor, and improve the sensing and detection capability of acoustic sensor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration control and material engineering, and particularly relates to a posture adjustment metamaterial isolator for underwater vehicles. BACKGROUND

[0002] Metamaterials are quasi-periodic composite materials artificially controlled and composed, which have physical properties that independent units or any natural materials do not have, and can realize artificial control of material macroscopic physical parameters such as modulus, stiffness, and density on the premise of guaranteeing mechanical properties.

[0003] An autonomous underwater vehicle (AUV) is a task controller that integrates artificial intelligence and other advanced computing technologies, and is a main equipment for ocean environment surveying, which is composed of a deep submergence vehicle, a sensor, an environmental effect, computer software, energy storage, conversion and propulsion, new materials and new technology. During the stable gliding of the underwater vehicle, the main noise source is the mechanical noise generated by the attitude adjustment unit when driving the underwater vehicle to adjust the pitch and roll attitude. The front and rear rib rings are installed at the front and rear ends of the unit shell, which connects the unit shell with other unit shells, and the attitude adjustment unit is fixed on the front and rear rib rings through a rotating shaft. The vibration noise generated by the attitude adjustment unit is mainly transmitted to the front and rear rib rings through the rotating shaft, and then transmitted to the underwater vehicle shell through the front and rear rib rings, which will affect the working performance of the acoustic sensor loaded on the underwater vehicle. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a posture adjustment metamaterial isolator for underwater vehicles to solve the problem of the influence of the vibration noise generated by the working of the posture adjustment system of the underwater vehicle on the working performance of the acoustic sensor.

[0005] The present application is implemented as follows: a posture adjustment metamaterial isolator for underwater vehicles, characterized in that it comprises an outer flange body, an inner flange body, and a metamaterial isolator component; the outer flange body is a circular ring body with a circular through hole, and a plurality of inner grooves are uniformly distributed on the inner ring surface of the outer flange body; the inner flange body is a circular ring body with a circular through hole, and a plurality of outer grooves are uniformly distributed on the outer ring surface of the inner flange body, the outer grooves and the inner grooves one-to-one correspond to form a groove cavity, the inner flange body is sleeved on the inner side of the circular through hole of the outer flange body, and there is an annular gap between the inner flange body and the outer flange ring; the metamaterial isolator component is composed of periodic arrangement of metamaterial basic cells, and the metamaterial isolator component is arranged in the groove cavity.

[0006] In the above technical solution, preferably, the outer flange body is provided with a plurality of outer notches extending axially from the end, the outer notches are distributed uniformly in the circumference of the outer flange body, the outer side of the outer notches is provided with an outer baffle, and the outer baffle and the outer notches form the inner groove; the inner flange body is provided with a plurality of inner notches extending axially from the end, the inner notches are distributed uniformly in the circumference of the inner flange body, the inner side of the inner notches is provided with an inner baffle, and the inner baffle and the inner notches form the outer groove.

[0007] In the above technical solution, preferably, the end of the inner flange body is provided with an outer ring, the outer diameter of the outer ring is greater than the inner diameter of the circular through hole of the outer flange body, the outer ring is arranged at one end of the inner flange body, and the end opening of the inner notch is located at the other end of the inner flange body.

[0008] In the above technical solution, preferably, the inner circumference of the outer flange body is provided with a plurality of outer slot grooves penetrating through the two end surfaces of the outer flange body, the positions of the outer slot grooves correspond to the inner grooves one by one, and the circumferential length of the outer slot groove is greater than the circumferential length of the inner groove; the outer circumference of the inner flange body is provided with a plurality of inner slot grooves penetrating through the two end surfaces of the inner flange body, the positions of the inner slot grooves correspond to the outer grooves one by one, and the circumferential length of the inner slot groove is greater than the circumferential length of the outer groove.

[0009] In the above technical solution, preferably, the super material basic cell is a six-surface frame structure formed by six walls, including two left-right symmetrical side straight walls and four upper-lower symmetrical side inclined walls.

[0010] In the above technical solution, preferably, the super material vibration isolation component is a structure body filled in the slot cavity and formed by periodically arranging the basic cells in the horizontal and vertical directions.

[0011] The advantages and effects of the present application are:

[0012] The present application provides a kind of for underwater vehicle's attitude adjustment super material vibration isolator, this vibration isolator acts between attitude adjustment unit and underwater vehicle shell, blocks the vibration noise transmission between attitude adjustment unit and underwater vehicle shell, reaches the effect of blocking vibration noise to acoustic sensor loaded in shell transmission, so as to improve the sensing and detection capability of acoustic sensor.The super material MCU100 used in the present application is a kind of high modulus high strength low creep polyurethane material developed by GFKGJ GJCL research project, resistant to oil, salt fog, ozone, mould, high and low temperature, flame-retardant and other environmental adaptability has passed the detection of relevant national standard.The super material can effectively block the noise in specific frequency band, the mechanical noise generated by underwater vehicle is in the blocking frequency band of super material, will be completely blocked when passing through super material vibration isolator in its propagation process. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of the present application;

[0014] Figure 2 is a structural schematic diagram of the outer flange body in the present application;

[0015] Figure 3 is a structural schematic diagram of the inner flange body in the present application;

[0016] Figure 4 is a structural schematic diagram of the base cell in the present application;

[0017] Figure 5 is a structural schematic diagram of the metamaterial vibration isolation component in the present application;

[0018] Figure 6 is a functional schematic diagram of the metamaterial vibration isolator in the present application;

[0019] Figure 7 is a vibration isolation coefficient curve diagram of the embodiment of the present application under different input frequencies. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0021] In order to solve the problem that the working vibration noise of the attitude adjustment system of the underwater vehicle affects the working performance of the acoustic sensor, the present application provides a metamaterial vibration isolator for attitude adjustment of an underwater vehicle. The vibration isolator can block the transmission of vibration noise to the acoustic sensor, and improve the sensing and detection capability of the acoustic sensor. In order to further illustrate the structure of the present application, the detailed description is as follows in combination with the drawings:

[0022] Please refer to Figure 1 A metamaterial vibration isolator for attitude adjustment of an underwater vehicle, comprising an outer flange body 1, an inner flange body 2 and a metamaterial vibration isolation component 3.

[0023] Please refer to Figure 2 and Figure 3 The outer flange body is a circular ring body with a circular through hole, and the inner circumferential surface of the outer flange body is uniformly distributed with a plurality of inner grooves 1-1. The inner flange body is a circular ring body with a circular through hole, and the outer circumferential surface of the inner flange body is uniformly distributed with a plurality of outer grooves 2-1. The outer grooves and the inner grooves correspond to each other to form a groove cavity. The inner flange body is sleeved on the inner side of the circular through hole of the outer flange body, and the inner flange body and the outer flange ring have a ring gap. Specifically, the outer flange body and the inner flange body are coaxially arranged to form a sleeve structure. The outer flange body and the inner flange body are aluminum components.

[0024] Referring to Figure 4 and Figure 5 The meta-material vibration isolation component is composed of periodic arrangement of meta-material basic cells, and the meta-material vibration isolation component is arranged in the slot cavity. The end of the inner flange body is provided with an outer ring portion 2-2, the outer diameter of the outer ring portion is greater than the inner diameter of the circular through hole of the outer flange body, and after the inner flange body is sleeved into the circular through hole of the outer flange body, the outer ring portion abuts against the end face of the outer flange body, and the outer ring portion plays a role of axial limiting.

[0025] The outer flange body is provided with a plurality of outer notches 1-2 extending axially from the end portion, the outer notches are distributed uniformly in the circumferential direction of the outer flange body, and the outer side of the outer notch is provided with an outer baffle 1-3, and the outer baffle and the outer notch form an inner groove. The outer notch is an equal-width opening that opens from the end portion of the outer flange body, penetrates the side wall of the outer flange body, but does not penetrate the two ends of the outer flange body. The outer baffle is an arc-shaped plate, the outer arc surface of which is located in the same cylindrical surface as the outer circumferential surface of the outer flange body, and the outer baffle is arranged at the outer side opening of the outer notch. The two inner sides of the outer notch and the inner side of the outer baffle form the inner groove.

[0026] The outer groove is formed in the same way as the inner groove. The inner flange body is provided with a plurality of inner notches 2-3 extending axially from the end portion, and the outer ring portion is arranged at one end of the inner flange body. The end portion of the inner notch opens at the other end of the inner flange body. The inner notches are distributed uniformly in the circumferential direction of the inner flange body, and the inner side of the inner notch is provided with an inner baffle 2-4, and the inner baffle and the inner notch form an outer groove.

[0027] The outer baffle is integrally formed with the outer flange body, and the inner baffle is integrally formed with the inner flange body.

[0028] The inner circumferential surface of the outer flange body is provided with a plurality of outer slot grooves 1-4 penetrating the two end surfaces of the outer flange body, and the positions of the outer slot grooves correspond one-to-one to the positions of the inner grooves. The circumferential length of the outer slot groove is greater than the circumferential length of the inner groove. The outer circumferential surface of the inner flange body is provided with a plurality of inner slot grooves 2-5 penetrating the two end surfaces of the inner flange body, and the positions of the inner slot grooves correspond one-to-one to the positions of the outer grooves. The circumferential length of the inner slot groove is greater than the circumferential length of the outer groove. The inner slot groove divides the outer ring portion into a plurality of annularly distributed arc-shaped flange plates. The side wall and the groove bottom of the outer slot groove and the inner slot groove are designed with a fillet. After the outer slot groove and the inner slot groove are assembled with the outer flange body and the inner flange body, a side groove with a width slightly greater than the slot cavity is formed in the middle of the slot cavity. The design of the side groove facilitates the assembly of the meta-material vibration isolation component into the slot cavity. The side groove facilitates the installation of the meta-material vibration isolation component into the gap composed of the outer flange body and the inner flange body.

[0029] The metamaterial is a man-made structured material, which is composed of basic cells (small unit bodies) arranged periodically, and has properties that traditional materials do not have. In the embodiment, the metamaterial is MCU100, which is a high-modulus, high-strength, and low-creep polyurethane material. The base material has a Young's modulus E=100Mpa and a Poisson's ratio v=0.475, and has properties such as oil resistance, salt spray resistance, ozone resistance, mold resistance, high and low temperature resistance, and flame resistance.

[0030] Specifically, the basic cell of the metamaterial is a six-sided frame structure formed by six walls, including two symmetrical side straight walls and four symmetrical side inclined walls. The basic cell takes the symmetrical center line of the two side straight walls as the axis. In the embodiment, the basic cell of the metamaterial is optimized in structure parameters by using the homogenization theory, and the length L1 of the side inclined wall (inclined arm), the angle a between the side inclined wall and the horizontal line, the thickness d2 of the side inclined wall, the axial height H3 of the basic cell, the height H2 of the center hole in the frame of the basic cell, the thickness d1 of the side straight wall (force arm), and the depth L2 of the basic cell are designed. The metamaterial composed of the periodically arranged basic cells can change the macroscopic mechanical properties of the metamaterial, achieve a specific modulus matrix, customize the natural frequency of the vibration isolator, and achieve the desired vibration reduction effect.

[0031] In the embodiment, the metamaterial vibration isolation component is a structure composed of basic cells arranged periodically in the horizontal and vertical directions, which is an arc-shaped plate-shaped elastic member with a certain thickness and height, and is tightly installed into the groove cavity by using the elasticity of the inner flange body and the outer flange body. In the embodiment, the number of groove cavities is five.

[0032] Please refer to Figure 6 The metamaterial vibration isolator described in the embodiment can be simplified as a spring oscillator model, which plays a role in isolating vibration between the shell and the vibration source.

[0033] The working state of the vibration isolator is as follows: two vibration isolators are divided into a front vibration isolator and a rear vibration isolator, the front vibration isolator is sleeved on the front rib ring, and the rear vibration isolator is sleeved on the rear rib ring, that is, the inner flange body of the vibration isolator is connected with the rib ring through the fastener, and the outer flange body of the vibration isolator is connected with the shell unit of the underwater vehicle. In the state of completing the connection of the components, the vibration transmission between the front rib ring and the rear rib ring and the shell unit of the underwater vehicle is completely cut off, when the vibration noise is transmitted to the front rib ring and the rear rib ring, the purpose of blocking the transmission of the vibration noise to the vehicle shell is achieved, and the working performance of the acoustic sensor is improved.

[0034] Please refer to Figure 7In the posture adjustment metamaterial vibration isolator parameter of the book of the embodiment, the natural frequency is 53Hz, the damping ratio is 0.07, the static stiffness is 244N / mm, and the experiment is verified, the vibration isolation coefficient curve under different input frequencies can be obtained, and it can be seen that when the vibration frequency of the vibration source is greater than 800hz, the vibration isolator has good vibration isolation effect.

[0035] The above are only preferred embodiments of the present application and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A metamaterial vibration isolator for attitude adjustment of underwater vehicles, characterized in that, include: The outer flange body is an annular body with a circular through hole, and the inner circumference of the outer flange body is evenly distributed with several inner grooves. The inner flange body is a circular ring with a circular through hole. Several external grooves are evenly distributed around the outer ring surface of the inner flange body. The external grooves and internal grooves correspond one-to-one to form a cavity. The inner flange body is fitted inside the circular through hole of the outer flange body. There is a circumferential gap between the inner flange body and the outer flange ring. A metamaterial vibration isolation component is provided, comprising periodically arranged metamaterial basic cells. The component is disposed within a cavity and installed into a gap formed by an outer flange and an inner flange. The outer flange has several axially extending outer notches, evenly distributed circumferentially around its circumference. An outer baffle is provided on the outer side of each notch, forming an inner groove with the outer notch. The inner flange has several axially extending inner notches, evenly distributed circumferentially around its circumference. An inner baffle is provided on the inner side of each inner notch, forming an outer groove with the inner notch. The inner flange body has an outer ring portion at its end. The outer diameter of the outer ring portion is larger than the inner diameter of the circular through hole of the outer flange body. The outer ring portion is located at one end of the inner flange body, and the end opening of the inner notch is located at the other end of the inner flange body.

2. The attitude adjustment metamaterial vibration isolator for underwater vehicles according to claim 1, characterized in that, The outer flange body has a plurality of external grooves that penetrate both ends of the outer flange body on its inner circumferential surface. The positions of the external grooves correspond one-to-one with the internal grooves, and the circumferential length of the external grooves is greater than the circumferential length of the internal grooves. The inner flange body has a plurality of internal grooves that penetrate both ends of the inner flange body on its outer circumferential surface. The positions of the internal grooves correspond one-to-one with the external grooves, and the circumferential length of the internal grooves is greater than the circumferential length of the external grooves.

3. The attitude adjustment metamaterial vibration isolator for underwater vehicles according to claim 2, characterized in that, The metamaterial basic cell is a six-sided frame structure formed by six shaped walls, including two straight walls that are symmetrical from left to right and four oblique walls that are symmetrical from top to bottom.

4. The attitude adjustment metamaterial vibration isolator for underwater vehicles according to claim 3, characterized in that, The metamaterial vibration isolation component is a structure composed of basic cells arranged periodically in the horizontal and vertical directions and filled in the cavity.

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