Device for suppressing low-frequency line spectrum vibration

Abstract

A device for suppressing low-frequency line spectrum vibration, comprising: a main housing (1), wherein an upper end cover (2) and a lower end cover (3) are respectively provided at two ends of the main housing (1); a diaphragm assembly comprising an upper diaphragm (4) and a lower diaphragm (5), wherein the upper diaphragm (4) and the lower diaphragm (5) are respectively mounted at two ends of the main housing (1) by means of the upper end cover (2) and the lower end cover (3); and a particle damper (6) provided in the main housing (1), wherein two ends of the particle damper (6) are respectively connected to the upper diaphragm (4) and the lower diaphragm (5), the upper diaphragm (4) and the lower diaphragm (5) are used for transmitting external vibration energy into the particle damper (6), and the particle damper (6) is used for dissipating the vibration energy. The device has a simple structure and the characteristics of broadband vibration absorption and high damping, and can be used for suppressing low-frequency line spectrum vibration.

Description

A device for suppressing low-frequency line spectrum vibration Technical Field

[0001] The present invention relates to the technical field of vibration reduction and noise reduction, and in particular to a device for suppressing low-frequency line spectrum vibration. Background Art

[0002] With the continuous improvement of shipbuilding technology and the widespread application of vibration and noise reduction technologies, the mechanical vibration caused by ship power and transmission systems has been effectively suppressed. However, the excitation of ship power and transmission systems has broadband characteristics, and the actual system has rich vibration modes, which makes the influence of low-frequency line spectrum vibration gradually prominent.

[0003] Traditional ship vibration and noise reduction technologies include vibration cancellation, vibration isolation, vibration absorption, vibration suppression, and structural optimization design. These methods can only reduce vibration levels across the entire frequency range, but are difficult to eliminate the low-frequency vibration line spectrum caused by the low-speed operation of the ship's power and transmission systems. Active vibration control introduces a secondary vibration source into the controlled vibration system. Through a specific control strategy or algorithm, the active control force applied to the controlled system is adjusted so that the vibration response generated at the desired location offsets the vibration response of the original excitation. Therefore, active vibration control can adapt to changes in external disturbance frequency and has a good control effect on low-frequency line spectrum vibration. However, active control systems typically require complex sensors, control algorithms, and actuators, resulting in relatively high system design and manufacturing costs. Due to the involvement of complex electronic and mechanical components, active control systems may require frequent maintenance, and system reliability may be affected.

[0004] Therefore, there is an urgent need for a device for suppressing low-frequency line spectrum vibration to solve the above problems.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a device for suppressing low-frequency line spectrum vibration to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides a device for suppressing low-frequency line spectrum vibration, comprising:

[0008] A main shell, with an upper end cover and a lower end cover respectively provided at both ends of the main shell;

[0009] A diaphragm assembly, comprising an upper diaphragm and a lower diaphragm, wherein the upper diaphragm and the lower diaphragm are respectively mounted at two ends of the main housing through the upper end cover and the lower end cover;

[0010] A particle damper is arranged in the main shell, and the two ends of the particle damper are respectively connected to the upper diaphragm and the lower diaphragm. The upper diaphragm and the lower diaphragm are used to transfer external vibration energy to the particle damper, and the particle damper is used to dissipate vibration energy.

[0011] Preferably, the particle damper includes a damping box shell, a damping box cover is provided on the top of the damping box shell, the damping box cover and the bottom of the damping box shell are respectively connected to the upper diaphragm and the lower diaphragm, and a plurality of damping particles are provided in the damping box shell.

[0012] Preferably, the damping box cover is threadedly connected to the damping box housing, and a plurality of washers are provided between the damping box cover and the damping box housing.

[0013] Preferably, the top end of the damping box cover and the bottom end of the damping box shell are both boss structures, and the boss structure, the upper diaphragm and the lower diaphragm are all provided with a plurality of first mounting holes at their center positions, and first bolts are provided in the first mounting holes.

[0014] Preferably, a plurality of second mounting holes are circumferentially formed on both ends of the main shell, the upper end cover, the lower end cover, the upper diaphragm and the lower diaphragm, and second bolts are provided in the second mounting holes.

[0015] Preferably, the upper diaphragm and the lower diaphragm are circular metal sheets, and the circular metal sheets are provided with hollow patterns.

[0016] Preferably, the thickness of the upper diaphragm and the lower diaphragm is 0.1 mm-1 mm.

[0017] Preferably, the upper diaphragm and the lower diaphragm are made of one of beryllium copper, titanium alloy, nickel-based alloy, and high-strength steel.

[0018] Preferably, the damping particles are made of one of iron-based particles, tungsten-based particles, copper particles, lead particles or ceramic particles.

[0019] Preferably, the particle size of the damping particles is 0.1 mm to 5 mm, and the filling ratio is 10% to 90%.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The present invention provides a device for suppressing low-frequency line spectrum vibrations. The diaphragm assembly broadens the vibration absorption frequency range. Simultaneously, through targeted energy transfer, it transfers external vibration energy to the particle damper, providing the particle damper with high amplitude conditions and improving its damping performance. Ultimately, the particle damper effectively dissipates the vibration energy. This device has a simple structure, high stability, and features broadband vibration absorption and high damping, making it suitable for suppressing low-frequency line spectrum vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0023] FIG1 is a schematic diagram of the internal structure of the device of the present invention;

[0024] FIG2 is a schematic diagram of the upper diaphragm structure of the present invention;

[0025] FIG3 is a force-displacement curve diagram of diaphragm assemblies of different thicknesses according to the present invention;

[0026] FIG4 is a schematic structural diagram of a second embodiment of the present invention;

[0027] FIG5 is a schematic structural diagram of a third embodiment of the present invention;

[0028] Among them, 1. Main shell; 2. Upper end cover; 3. Lower end cover; 4. Upper diaphragm; 5. Lower diaphragm; 6. Particle damper; 61. Damping box shell; 62. Damping box cover; 63. Damping particles; 64. Gasket. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1:

[0032] 1 to 3 , the present invention provides a device for suppressing low-frequency line spectrum vibration, comprising:

[0033] The main housing 1 is provided with an upper end cover 2 and a lower end cover 3 at both ends of the main housing 1;

[0034] The diaphragm assembly includes an upper diaphragm 4 and a lower diaphragm 5, which are respectively mounted on both ends of the main housing 1 through an upper end cover 2 and a lower end cover 3;

[0035] The particle damper 6 is arranged in the main shell 1, and the two ends of the particle damper 6 are respectively connected to the upper diaphragm 4 and the lower diaphragm 5. The upper diaphragm 4 and the lower diaphragm 5 are used to transfer external vibration energy to the particle damper 6, and the particle damper 6 is used to dissipate vibration energy.

[0036] According to a further optimization scheme, the particle damper 6 includes a damping box shell 61, a damping box cover 62 is provided on the top of the damping box shell 61, the damping box cover 62 and the bottom of the damping box shell 61 are respectively connected to the upper diaphragm 4 and the lower diaphragm 5, and a plurality of damping particles 63 are provided in the damping box shell 61.

[0037] The damping box housing 61 is located inside the main housing 1 , and external vibration energy is transmitted to the particle damper 6 , where the vibration energy is effectively dissipated through collision and friction of the damping particles 63 inside the particle damper 6 .

[0038] In a further optimized solution, the damping box cover 62 is threadedly connected to the damping box housing 61 , and a plurality of washers 64 are provided between the damping box cover 62 and the damping box housing 61 .

[0039] 1 , there are several washers 64 , which are arranged in contact along the axial direction. The damping box cover 62 is threadedly connected to the damping box housing 61 and is arranged in contact with the washers 64 . By increasing or decreasing the number of washers 64 , the height of the damping box cover 62 is adjusted, thereby adjusting the overall height of the particle damper 6 , so that the upper diaphragm 4 and the lower diaphragm 5 at both ends produce initial deformation, forming geometric nonlinearity for designing and adjusting nonlinear stiffness.

[0040] According to a further optimization scheme, the top end of the damping box cover 62 and the bottom end of the damping box shell 61 are both boss structures, and a plurality of first mounting holes are provided at the center positions of the boss structure, the upper diaphragm 4 and the lower diaphragm 5, and first bolts are provided in the first mounting holes.

[0041] 1 , the boss structures on the top end of the damping box cover 62 and the bottom end of the damping box housing 61 are symmetrically arranged, and are connected to the upper diaphragm 4 and the lower diaphragm 5 respectively through the first bolts and the first mounting holes, so that the upper diaphragm 4 and the lower diaphragm 5 are fixed with additional mass in the center around them. The forced motion displacement is greater than the thickness of the upper diaphragm 4 and the lower diaphragm 5, thereby generating nonlinear stiffness.

[0042] According to a further optimized solution, a plurality of second mounting holes are circumferentially provided on both ends of the main shell 1, the upper end cover 2, the lower end cover 3, the upper diaphragm 4 and the lower diaphragm 5, and second bolts are provided in the second mounting holes.

[0043] By setting the second bolt and the second mounting hole, the installation between the two ends of the main shell 1, the upper end cover 2, the lower end cover 3, the upper diaphragm 4 and the lower diaphragm 5 is achieved. The upper diaphragm 4 and the lower diaphragm 5 are tightly attached to the two ends of the main shell 1, and the upper end cover 2 and the lower end cover 3 are tightly attached to the upper diaphragm 4 and the lower diaphragm 5, so as to achieve sealing inside the device and protect the internal components.

[0044] According to a further optimized solution, the upper diaphragm 4 and the lower diaphragm 5 are circular metal sheets with hollow patterns provided on them.

[0045] 2 , (a) in FIG2 is a circular hollow pattern, and (b) is a spiral hollow pattern. By setting and selecting the upper diaphragm 4 and the lower diaphragm 5 with the hollow pattern, the stiffness range of the upper diaphragm 4 and the lower diaphragm 5 can be adjusted.

[0046] According to a further optimized solution, the thickness of the upper diaphragm 4 and the lower diaphragm 5 is 0.1 mm to 1 mm.

[0047] 3 , appropriate thicknesses of the upper diaphragm 4 and the lower diaphragm 5 are selected according to the vibration absorption frequency band required for actual working conditions.

[0048] According to a further optimization scheme, the material of the upper diaphragm 4 and the lower diaphragm 5 is one of beryllium copper, titanium alloy, nickel-based alloy, and high-strength steel.

[0049] The upper diaphragm 4 and the lower diaphragm 5 are made of one of beryllium copper, titanium alloy, nickel-based alloy and high-strength steel, and are all made of high-strength and fatigue-resistant materials.

[0050] According to a further optimization solution, the material of the damping particles 63 is one of iron-based particles, tungsten-based particles, copper particles, lead particles or ceramic particles.

[0051] By selecting the material of the damping particles 63 , the vibration energy can be effectively dissipated through the collision and friction between the damping particles 63 .

[0052] According to a further optimized solution, the particle size of the damping particles 63 is 0.1 mm to 5 mm, and the filling ratio is 10% to 90%.

[0053] By selecting damping particles 63 of different particle sizes and adjusting different filling ratios, the nonlinear damping can be adjusted.

[0054] The diaphragm assembly has nonlinear stiffness, which comes from the upper diaphragm 4 and the lower diaphragm 5. The upper diaphragm 4 and the lower diaphragm 5 are relatively thin, and the amplitude during vibration is greater than the thickness of the upper diaphragm 4 and the lower diaphragm 5 themselves, resulting in nonlinear stiffness as shown in Figure 3.

[0055] The nonlinear damping is derived from the collision and friction energy consumption of the damping particles 63 in the particle damper 6 and is a highly nonlinear damping.

[0056] The diaphragm assembly broadens the vibration absorption frequency range, and at the same time transfers the external vibration energy to the particle damper 6 through targeted energy transfer, providing high amplitude conditions for the particle damper 6 to improve the damping performance of the particle damper 6, and finally effectively dissipating the vibration energy through the particle damper 6.

[0057] The device is connected to the structure to be damped by bolts. When it vibrates within the vibration absorption frequency range of the device, the system composed of the diaphragm assembly and the particle damper 6 produces strong resonance, and the external vibration energy is transmitted to the device, and finally the vibration energy is dissipated through the collision and friction of the damping particles 63 in the particle damper 6.

[0058] Example 2:

[0059] 4 , this embodiment is connected to the object to be damped via bolts and nuts through the mounting holes on the upper end cover 2 or the lower end cover 3 , and can be arranged in a distributed parallel manner according to actual needs.

[0060] According to the vibration reduction frequency, the upper diaphragm 4 and the lower diaphragm 5 with different thicknesses and hollow structures and the mass of the filled damping particles 63 are selected to adjust different vibration absorption frequency bands, and multiple vibration absorption frequency bands are used in combination.

[0061] They are primarily placed in locations with intense vibration, along vibration transmission paths, and along the antinodes of the elastic body's modal vibrations to achieve optimal vibration reduction. As shown in Figure 4, the device is arranged based on the modal vibrations of the flat panel.

[0062] Example 3:

[0063] 5 , in scenarios where horizontal space is limited, this embodiment can connect two sets of devices in parallel vertically using bolts and nuts. Similarly, devices with different vibration absorption frequency bands can be combined to broaden the vibration absorption frequency range.

[0064] When dealing with wider low-frequency line spectrum vibrations, the vibration reduction frequency band of the device is adjusted and two devices with two vibration reduction frequency bands are used vertically in parallel to broaden the vibration reduction frequency range.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A device for suppressing low-frequency line spectrum vibration, characterized in that, Comprising: A main housing (1), with an upper end cover (2) and a lower end cover (3) respectively arranged at both ends of the main housing (1); A diaphragm assembly, including an upper diaphragm (4) and a lower diaphragm (5), the upper diaphragm (4) and the lower diaphragm (5) are respectively installed at both ends of the main housing (1) through the upper end cover (2) and the lower end cover (3); A particle damper (6), arranged inside the main housing (1), and both ends of the particle damper (6) are respectively connected to the upper diaphragm (4) and the lower diaphragm (5), the upper diaphragm (4) and the lower diaphragm (5) are used to transfer external vibration energy into the particle damper (6), and the particle damper (6) is used to dissipate vibration energy.

2. The device for suppressing low-frequency line spectrum vibration according to claim 1, characterized in that: The particle damper (6) includes a damper box housing (61), a damper box cover (62) is arranged at the top of the damper box housing (61), the damper box cover (62) and the bottom end of the damper box housing (61) are respectively connected to the upper diaphragm (4) and the lower diaphragm (5), and a number of damping particles (63) are arranged inside the damper box housing (61).

3. The device for suppressing low-frequency line spectrum vibration according to claim 2, characterized in that: The damper box cover (62) is threadedly connected to the damper box housing (61), and a number of washers (64) are arranged between the damper box cover (62) and the damper box housing (61).

4. The device for suppressing low-frequency line spectrum vibration according to claim 3, characterized in that: Both the top end of the damper box cover (62) and the bottom end of the damper box housing (61) are boss structures, and a number of first mounting holes are opened at the central positions of the boss structures, the upper diaphragm (4) and the lower diaphragm (5). First bolts are arranged inside the first mounting holes.

5. The device for suppressing low-frequency line spectrum vibration according to claim 1, characterized in that: A number of second mounting holes are circumferentially opened on both ends of the main housing (1), the upper end cover (2), the lower end cover (3), the upper diaphragm (4) and the lower diaphragm (5). Second bolts are arranged inside the second mounting holes.

6. A device for suppressing low-frequency line spectrum vibration according to claim 1, characterized in that: The upper diaphragm (4) and the lower diaphragm (5) are circular metal sheets, and hollow patterns are arranged on the circular metal sheets.

7. The device for suppressing low-frequency line spectrum vibration according to claim 1, wherein: The thickness of the upper diaphragm (4) and the lower diaphragm (5) is 0.1mm - 1mm.

8. A device for suppressing low-frequency line spectrum vibration according to claim 1, characterized in that: The materials of the upper diaphragm (4) and the lower diaphragm (5) are one of beryllium copper, titanium alloy, nickel-based alloy, and high-strength steel.

9. The device for suppressing low-frequency line spectrum vibration according to claim 2, wherein: The material of the damping particles (63) is one of iron-based particles, tungsten-based particles, copper particles, lead particles, or ceramic particles.

10. A device for suppressing low-frequency line spectrum vibration according to claim 2, characterized in that: The particle size of the damping particles (63) is 0.1mm - 5mm, and the filling ratio is 10% - 90%.

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