Vibration-controllable marine magnetorheological damper base

Abstract

The invention discloses a vibration-controllable marine magneto-rheological damper base, which belongs to the technical field of vibration and noise reduction of ship and ocean engineering, and comprises a control system, a bottom plate bracket, a web plate, a first panel, a second panel and a magneto-rheological damper, the two ends of the magneto-rheological damper are hinged to the end, away from the first panel, of the second panel and the bottom plate support respectively, the axis of the magneto-rheological damper coincides with the axis of the first rib plate, and the control system is used for adjusting the working state of the magneto-rheological damper; by optimizing the base structure and matching with the magnetorheological damper and the intelligent base chaos control system, transmission of ship line spectrum vibration characteristics to a ship body structure is controlled, ship line spectrum noise is reduced, the problems that an existing vibration isolation device is small in size and limited by the internal space of a ship are solved, and the ship line spectrum vibration isolation effect is improved. And an intelligent actuator is difficult to install in a vibration isolation device so as to realize nonlinear control of ship line spectrum vibration characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction and noise reduction for ships and ocean engineering, and particularly to a vibration-controllable marine magnetorheological damper base. Background Art

[0002] With the continuous development of ship engineering, higher requirements are placed on the dynamic performance of ships, and thus the vibration reduction performance of ship equipment has attracted more and more attention. In ship engineering, both the influence of ship's own equipment and external environmental loads will affect the vibration of the hull; for military ships, due to their special working environment, once attacked by enemy weapons during combat, it will cause strong impact vibration. Vibration with too large amplitude and frequency will not only exacerbate the fatigue damage of the hull, but also interfere with the normal operation of ship equipment, reducing working precision and service life. At the same time, being in the cabin noise environment caused by hull vibration for a long time is also very unfavorable to the ship's crew. In addition to affecting comfort, fatigue and work efficiency, it may also cause physical damage in severe cases. The importance of vibration reduction performance for military ships is self-evident, because the intensity of vibration and noise is directly related to the stealth performance of the ship, and the stealth performance directly affects the combat effectiveness of the ship. Once the traditional ship structure is designed and manufactured, its dynamic characteristics are also determined, and it is very difficult to make major adjustments in a short time, and ship vibration and noise have become a prominent problem. Therefore, it is of great significance to develop more advanced and effective ship vibration reduction equipment and structures and strengthen the research on ship vibration control.

[0003] To reduce the harm of vibration interference and underwater explosion shock, vibration reduction equipment and the passive vibration reduction devices composed of them are often used on ships. They have the advantages of simple structure, mature manufacturing process, low cost, etc. However, their structural characteristics cannot be changed after the components are produced, and they cannot perform vibration reduction work well when the working environment changes. They are ineffective for complex structural vibration systems subjected to low-frequency, broadband non-stationary random excitation or dynamic characteristics showing time-varying uncertainty. The equipment on actual ships is often subjected to vibrations and explosion shocks with frequencies ranging from as low as a few hertz to as high as thousands of hertz, with a very wide frequency range. And for low-frequency vibration, a high stiffness of the vibration reduction equipment is required, while for high-frequency vibration (explosion shock wave), a low stiffness of the vibration reduction equipment is required, and these two are contradictory. Conventional vibration reduction equipment, due to its constant stiffness, although it can reduce the total vibration level in the whole frequency band, it is very difficult to eliminate the low-frequency vibration line spectrum and can no longer meet the higher usage needs of actual engineering.

[0004] In order to enhance the environmental adaptability of structures and improve their performance, the concept of intelligent structures was proposed by the US military in the 1980s. By integrating sensors, actuators, controllers with the main structure and combining relevant signal processing and electronic circuit systems, a structural system with special intelligent functions such as structural health self-diagnosis, environmental self-adaptation, and damage self-healing is formed to enhance reliability and stability. The research potential and application value of intelligent material and structure technology are huge, which has attracted great attention from countries around the world in recent years and has been widely and significantly applied in the fields of aviation, aerospace, civil engineering, biology, medicine, machinery, electronics, etc. Ship active and semi-active control vibration reduction based on intelligent structures has a good application prospect by introducing a secondary vibration source into the controlled system and adding a monitoring strategy to make the response of the controlled system to the secondary vibration source cancel out the response of the main vibration source. However, currently, active control is mostly applied to the vibration isolation devices of main equipment, and there is almost no application of ship intelligent structures.

[0005] To solve the above problems, the present invention provides a vibration-controllable marine magnetorheological damper base to solve the above problems. Summary of the Invention

[0006] The present invention provides a vibration-controllable marine magnetorheological damper base to achieve the control of the transmission of the ship's line spectrum vibration characteristics to the hull structure and reduce the ship's line spectrum noise.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A vibration-controllable marine magnetorheological damper base includes a control system, a bottom plate bracket, a web vertically arranged on the bottom plate bracket, a first panel vertically arranged on the web, a second panel inclined downwardly connected to the first panel, a first rib plate connecting the first panel and the second panel, and a magnetorheological damper. Both ends of the magnetorheological damper are respectively hinged to one end of the second panel away from the first panel and the bottom plate bracket. The axis of the magnetorheological damper coincides with the axis of the first rib plate. The control system is used to adjust the working state of the magnetorheological damper.

[0009] Preferably, second rib plates are arranged on both sides of the web. The shape of the second rib plate is a right triangle, and the two right sides of the second rib plate are respectively connected to the web and the bottom plate bracket.

[0010] Preferably, the magnetorheological damper is hinged to the second panel and the bottom plate bracket through pin bolts.

[0011] Preferably, at least two magnetorheological dampers are provided.

[0012] Preferably, the magnetorheological damper is inclined along the length direction of the bottom plate bracket.

[0013] Preferably, the magnetorheological damper includes a housing, a magnetorheological piston assembly and magnetorheological fluid disposed inside the housing. An annular hole is formed in the magnetorheological piston and a coil winding is wound around the piston.

[0014] Preferably, a sealing assembly is provided on the housing.

[0015] Preferably, the control system includes an intelligent base chaotic control system, a chaotic reference system and a chaotic controller. The intelligent base chaotic control system monitors vibrations, inputs the excitation into the chaotic reference system in real time, compares the vibration conditions with the output of the chaotic reference system, and inputs the comparison result into the chaotic synchronization controller.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By optimizing the base structure, and combining with a magnetorheological damper and an intelligent base chaotic control system, the present invention realizes the control of the transmission of the ship's line spectrum vibration characteristics to the hull structure, reduces the ship's line spectrum noise, solves the problems of the small volume of the existing vibration isolation device and the limitation of the internal space of the ship, and it is difficult to install an intelligent actuator in the vibration isolation device to realize the non-linear control of the ship's line spectrum vibration characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the magnetorheological damper of the present invention and its connection form;

[0021] Figure 3 It is a schematic diagram of the control system of the present invention;

[0022] Among them, 1, the second panel; 2, the first panel; 3, the bottom plate bracket; 4, the first rib; 5, the second rib; 6, the web; 7, the magnetorheological damper. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention provides a vibration-controllable marine magnetorheological damper base to achieve the control of the transmission of the ship's line spectrum vibration characteristics to the hull structure and reduce the ship's line spectrum noise.

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 3 , a vibration-controllable marine magnetorheological damper base, including a control system, a bottom plate bracket, a web vertically arranged on the bottom plate bracket, a first panel vertically arranged on the web, a second panel obliquely downwardly connected to the first panel, a first rib plate connecting the first panel and the second panel, and a magnetorheological damper. The two ends of the magnetorheological damper are respectively hinged to one end of the second panel far from the first panel and the bottom plate bracket. The axis of the magnetorheological damper coincides with the axis of the first rib plate. The control system is used to adjust the working state of the magnetorheological damper. By optimizing the base structure, matching the magnetorheological damper and the intelligent base chaos control system, the present invention realizes the control of the transmission of the ship's line spectrum vibration characteristics to the hull structure, reduces the ship's line spectrum noise, and solves the problems of the small volume of the existing vibration isolation device and the limitation of the internal space of the ship, making it difficult to install an intelligent actuator in the vibration isolation device to realize the non-linear control of the ship's line spectrum vibration characteristics.

[0027] Reference Figure 1 , second rib plates are arranged on both sides of the web. The shape of the second rib plate is a right triangle, and the two right sides of the second rib plate are respectively connected to the web and the bottom plate bracket. The purpose is to enhance the stability of the connection between the web and the bottom plate bracket.

[0028] Reference Figure 1 , the magnetorheological damper is hinged to both the second panel and the bottom plate bracket through pin bolts.

[0029] Furthermore, at least two magnetorheological dampers are provided.

[0030] Reference Figure 1 , the magnetorheological damper is inclined along the length direction of the bottom plate bracket.

[0031] Furthermore, the magnetorheological damper includes a housing, a magnetorheological piston assembly disposed inside the housing, and magnetorheological fluid. The magnetorheological piston is provided with an annular hole and wound with a coil winding, and a sealing assembly is provided on the housing. The damping force output of the magnetorheological damper is premised on the vibration speed and displacement of the damper piston. However, in the structure of the present invention, due to requirements such as structural strength and equipment stability, the typical base structure panel does not have large vibration speed and displacement. In order to enable the magnetorheological damper to output a damping force that meets the requirements, the designed intelligent base structure optimizes the design of the typical base structure - lengthens the panel, so that the piston of the magnetorheological damper can have sufficient vibration speed and displacement.

[0032] When the magnetorheological damper is powered on, a magnetic field will be generated around the coil of the magnetorheological piston, and the flow characteristics of the magnetorheological fluid will change when it flows near the piston. As the current increases, the magnetic field around the magnetorheological piston also increases, and the magnetorheological fluid around it becomes more viscous, and the damping provided by the magnetorheological damper also increases accordingly. Conversely, as the current decreases, the damping provided by the magnetorheological damper also decreases. By adjusting the magnitude of the input current of the magnetorheological damper, the magnitude of the damping force of the magnetorheological damper can be adjusted.

[0033] Reference Figure 3 , the control system includes an intelligent base chaotic control system, a chaotic reference system, and a chaotic controller. The intelligent base chaotic control system monitors the vibration, inputs the excitation into the chaotic reference system in real time, compares the vibration situation with the output of the chaotic reference system, and inputs the comparison result into the chaotic synchronization controller.

[0034] Furthermore, the vibration characteristics of the energy-concentrated line spectrum, especially the low-frequency line spectrum vibration that is not easily dissipated, have a greater impact on the acoustic stealth effect of the ship. The base structure of the magnetorheological damper can generate subharmonic responses or even chaotic responses under the excitation of a simple harmonic line spectrum. When analyzing the signal characteristics from the frequency domain perspective, the base structure of the magnetorheological damper can transform the vibration characteristics of the energy-relatively concentrated line spectrum into a broadband continuous spectrum with a more dispersed energy distribution.

[0035] Applying the magnetorheological damper to the base structure and controlling it to cause chaotic phenomena in the base structure, the line spectrum excitation of various power and auxiliary equipment may be transformed into chaotic responses due to chaotic phenomena through the base on which they are installed and transmitted to the ship structure. First, the line spectrum response generated by the excitation is chaoticized during the vibration transmission process, thereby changing the line spectrum characteristics of the ship noise. This is the line spectrum reconstruction effect of the ship intelligent base. Second, the energy-concentrated input of the line spectrum vibration in the excitation is transformed into a continuous output of energy in the broadband frequency domain, reducing the intensity of the line spectrum vibration. This is the vibration suppression effect of the ship intelligent base.

[0036] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A vibration-controllable marine magnetorheological damper base, characterized in that, It includes a control system, a bottom plate bracket, a web vertically arranged on the bottom plate bracket, a first panel vertically arranged on the web, a second panel obliquely and downwardly connected to the first panel, a first rib plate connecting the first panel and the second panel, and a magnetorheological damper. Both ends of the magnetorheological damper are respectively hinged to one end of the second panel far from the first panel and the bottom plate bracket. The axis of the magnetorheological damper coincides with the axis of the first rib plate. The control system is used to adjust the working state of the magnetorheological damper.

2. The vibration-controllable marine magnetorheological damper base according to claim 1, characterized in that, Second rib plates are arranged on both sides of the web. The shape of the second rib plate is a right triangle. The two right sides of the second rib plate are respectively connected to the web and the bottom plate bracket.

3. The vibration-controllable marine magnetorheological damper base according to claim 1, characterized in that The magnetorheological damper is hinged to the second panel and the bottom plate bracket through pin bolts.

4. The vibration-controllable marine magnetorheological damper base according to claim 3, wherein At least two magnetorheological dampers are provided.

5. The vibration-controllable marine magnetorheological damper base according to claim 4, characterized in that, The magnetorheological dampers are inclined along the length direction of the bottom plate bracket.

6. The vibration-controllable marine magnetorheological damper base according to claim 1, wherein The magnetorheological damper includes a housing, a magnetorheological piston assembly arranged inside the housing, and magnetorheological fluid. An annular hole is formed in the magnetorheological piston and a coil winding is wound around it.

7. The vibration-controllable marine magnetorheological damper base according to claim 6, characterized in that, A sealing assembly is arranged on the housing.

8. The vibration-controllable marine magnetorheological damper base according to claim 1, characterized in that, The control system includes an intelligent base chaotic control system, a chaotic reference system, and a chaotic controller. The intelligent base chaotic control system monitors vibrations, inputs the excitation into the chaotic reference system in real time, compares the vibration conditions with the output of the chaotic reference system, and inputs the comparison result into the chaotic synchronization controller.

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