KR101103059B1 - Inertia type hybrid mount for vibration and shock suppression - Google Patents

Abstract

The present invention relates to an inertial force-type composite mount for vibration and shock reduction, more specifically the center plate; An elastic rubber fixed to the center plate and having a plurality of through holes formed in a thickness direction thereof; A support plate disposed above the elastic rubber and a bottom plate disposed below the elastic rubber; A housing inserted into the through hole and fixed to a lower surface of the support plate; A piezoelectric actuator disposed in the housing and providing a reaction force against a load applied to the support plate; And an inertial mass positioned in the elastic rubber, one end of which is connected to the piezoelectric actuator, and which amplifies the operating force of the piezoelectric actuator.

Mounts, Elastic Rubber, Piezo Actuators, Inertial Masses, Vibration, Passive, Active

Description

Inertia type hybrid mount for vibration and shock suppression

The present invention relates to an inertial force-type composite mount for vibration and shock reduction, and more specifically, is used as a support for machinery such as precision equipment installed in a navy ship such as a ship or a submersible, and absorbs and blocks the shock and noise generated from the machinery. The present invention relates to an inertial force-type composite mount for vibration and shock reduction that protects machinery from external shocks.

In general, the mount is used as a support of the machinery to support the load of the machinery while reducing the transmission of vibration and noise generated from the machinery to the outside.

In order to reduce the vibration of the machinery and the transmission of noise and shock, such a mount must have a natural frequency lower than a certain ratio compared to the vibration frequency generated by the machinery, in order to reduce the rigidity of the mount.

In addition, in order to use the mount in a ship for a long time in the environment in the ship should have a durability that does not change its characteristics, and in order to use in a variety of machinery must have a constant natural frequency characteristics even in a wide range of support loads.

In the related art, mounts using various elastic rubbers have been introduced to absorb or mitigate shocks such as damping noise or vibration.

Looking at the contents disclosed in Republic of Korea Patent Nos. 10-0596691, 10-0550079, and 10-0556156, the vessel mount is attached to the center plate fixed to the support, the center plate is bonded to absorb vibration and shock An elastic rubber, a flange for supporting the machinery on top of the elastic rubber and transmitting vibration and impact loads of the machinery to the elastic rubber, and a flange sleeve inserted into the inner diameter of the elastic rubber and fastened to the machinery together with the flange. It is composed.

However, the conventional passive (elastic rubber) mount has a fixed characteristic for all frequency components, and thus, it is difficult to reduce vibration and noise and shock transmission of vibration force having special frequency components generated in machinery.

The present invention is to solve the above problems, an object of the present invention is used as a base of machinery, such as precision instruments installed in naval vessels such as ships or submarines, to absorb and block the shock and noise generated from the machinery, It provides an inertial composite mount for vibration and shock reduction that protects machinery from external shocks.

In order to achieve the above object of the present invention,

According to one aspect of the invention,

Center plate;

An elastic rubber fixed to the center plate and having a plurality of through holes formed in a thickness direction thereof;

A support plate disposed above the elastic rubber and a bottom plate disposed below the elastic rubber;

A housing inserted into the through hole and fixed to a lower surface of the support plate; A piezoelectric actuator disposed in the housing and providing a reaction force against a load applied to the support plate; And

Located in the elastic rubber, one end is connected to the piezoelectric actuator, there is provided an inertial force composite mount for vibration and shock reduction including an inertial mass to amplify the operating force of the piezoelectric actuator.

As described above, the inertial force-type composite mount for vibration and shock reduction according to the present invention is used as a support for machinery such as precision equipment installed in a navy ship such as a ship or a submarine, and absorbs the shock and noise generated from the machinery. Shut off and protect machinery from external impacts.

Hereinafter, with reference to the accompanying drawings an inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention will be described in detail. The accompanying drawings show exemplary forms of the present invention, which are provided to explain the present invention in more detail, and the technical scope of the present invention is not limited thereto.

1 is a perspective view of an inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the inertial force-type composite mount for vibration and shock reduction shown in Figure 1, Figure 3 Is a sectional view of the main portion of the inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention.

The inertial force-type composite mount 10 for vibration and shock reduction according to an embodiment of the present invention is fixed to the center plate 4 and the center plate 4, and a plurality of through holes 32 and 33 in the thickness direction. The formed elastic rubber 3, the support plate 2 disposed on the upper portion of the elastic rubber 3 and the bottom plate (1) disposed on the lower portion of the elastic rubber.

The bottom plate (1) is in close contact with the floor to maintain the horizontal of the inertial force-type composite mount (10) for vibration and shock reduction, so that it can be combined with the machinery mounted on the upper surface of the support plate (2) It may have a single coupling tube 11 upright to the upper center portion.

Machinery is placed on the support plate 2, and a coupling hole 21 corresponding to the coupling pipe 11 of the bottom plate 1 may be formed through the center.

In addition, the inertial force-type composite mount 10 for vibration and impact reduction is inserted into the through hole 33 and is disposed in the housing 23 fixed to the lower surface of the support plate 2, the housing 23. And a piezoelectric actuator 22 which provides a reaction force against the load applied to the supporting plate 2 and the elastic rubber 3, one end of which is connected to the piezoelectric actuator 22, and a piezoelectric actuator 22 It includes an inertial mass (24, 25) to amplify the operating force of.

The piezoelectric actuator 22 transmits force in a reverse direction so as to cancel noise and vibration with respect to the impact and load applied to the support plate 2, and may be at least one, and the piezoelectric element 22-1 may be at least one. It is coupled to the lower surface of the support plate (2).

The housing 23 surrounds the piezoelectric actuator 22 and is fixed to the lower surface of the support plate 2.

At this time, in the housing 23, the piezoelectric element 22-1 of the piezoelectric actuator 22 accommodated therein may be coupled to the lower surface of the support plate 2, and the piezoelectric actuator 22 may operate toward the support plate. Preferably, the upper surface is open and has a structure for supporting the piezoelectric actuator 22 to the lower surface.

The elastic rubber (3) is interposed between the support plate (2) and the bottom plate (1) to absorb the shock, the center plate (4) formed with the support hole is fixed to the outer peripheral surface to be fixed to the ground, the bottom inside The first through-hole 32 is formed in the thickness direction to allow the support tube 11 of the plate 1 to be disposed, and the second in the thickness direction to allow the piezoelectric actuator 22 to be disposed therein. The through hole 33 is formed.

At this time, the piezoelectric actuator 22 is disposed in the second through hole 32 of the elastic rubber 3 in a state accommodated in the housing 23, and therefore, the piezoelectric actuator 22 and the elastic rubber 3 have an external load. It is connected in series along the direction in which it is applied.

That is, since the elastic rubber 3, which is a passive element, and the piezoelectric actuator 22, which is an active element, are connected in series, the resonance frequency is controlled by a passive element having a low rigidity, and thus can be set very low. It can be installed in naval ships that require confidentiality.

In addition, the housing 23 not only protects the piezoelectric actuator 22, but also connects the passive element and the active element, and can act as an inertial body that amplifies the operating force of the piezoelectric actuator 22 by the weight of the housing 23 itself. have.

On the other hand, when the passive element and the active element are connected in series, a problem may arise in that the overall height of the mount increases, but such a problem may be solved by inserting the piezoelectric actuator 22 into the elastic rubber 3 that is the passive element. .

The inertial mass 24 is for amplifying the operating force of the piezoelectric actuator 22, and may be used regardless of the shape as long as it has a high specific gravity.

For example, the inertial masses 24 and 25 may be manufactured in a single conical shape 24 (see FIG. 2) to have an outer surface identical to the shape of the inner circumferential surface 31 of the elastic rubber, in which case the piezoelectric actuator 22 and A fastening hole 24-1 for fastening and a through hole 24-2 for passing through a coupling pipe may be formed.

Alternatively, it may be a unit mass (see FIGS. 5 and 6) coupled to the bottom of each piezoelectric actuator, in which the upper end of the mass may be connected to the piezoelectric actuator through a fitting hole formed in the lower surface of the housing.

That is, the piezoelectric actuator 22, which is an active element, can increase the vibration reduction effect by reducing the vibration based on the inertial force generated by the movement of the added weight as well as the operating force caused by the movement of the piezoelectric actuator 22.

In addition, since the hollow portion 31 is formed inside the elastic rubber, and the inertial mass 24 is fitted into the hollow portion, thereby preventing the height of the inertial force-type composite mount 10 for increasing vibration and impact reduction. can do.

4 and 5 are cross-sectional views showing the operating relationship between the piezoelectric actuator and the inertial mass constituting the inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention, Figures 6 and 7 Sectional drawing which shows the operation relationship of the piezoelectric actuator and the inertial mass which comprise the inertial force type composite mount for vibration and shock reduction which concerns on another embodiment.

As described above, a conical inertial mass 24 is shown in FIGS. 4 and 5, and a unit mass 25 is shown in FIGS. 6 and 7, and the vibration reduction effect and operation are the same, but only The only difference is the shape of the inertial mass and the specific connection with the piezoelectric actuator.

Machinery 20 is mounted on the support plate 2, and the machinery can be fixed by a pin 5, etc., and the end of the pin 5 is connected to the bottom of the bottom plate 1 via a coupling hole 21. By being inserted into the coupling pipe 11, the impact transmitted from the machinery 20 absorbs the impact through the elastic rubber 3, while the machinery 20 can be fixed to the support plate 2.

A vibration sensor 6 for detecting vibration and shock is attached to a lower surface of the support plate 2, and the vibration sensor 6 and the piezoelectric actuator 22 may be connected to the controller 7.

First, vibration and noise are canceled by contraction of the elastic rubber, and secondly, vibration and noise are canceled by the contraction operation of the piezoelectric actuator 22.

Here, the greater the magnitude of the reverse vibration generated through the piezoelectric actuator 22, the greater the canceling effect of the noise and vibration that is derived, and the inertial masses 24 and 25 connected to the piezoelectric actuator 22. Since the vibration force of the piezoelectric actuator 22 is generated by the inertial force, the vibration and noise transmitted to the support plate 2 may be more canceled out.

Example

In order to confirm the remarkable effects of the inertial force-type composite mount for vibration and shock reduction with the above structure, the magnitude of the operating force according to the frequency was tested.

The inertial force-type composite mount (example) and the mount without the inertial mass (Comparative Example) for vibration and shock reduction according to an embodiment of the present invention were tested, and the results are shown in a table.

Frequency (Hz) Example (N) Comparative example (N) 20 1.199 1.159 50 5.497 2.762 100 20.62 6.892 200 103.4 66.73 400 1061 242.2 600 1310 822 700 1580 943 800 1880 1101 900 2166 1339 1000 2302 1533

As shown in Table 1, the inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention shows a high operating force over the entire frequency range, in particular in the 50Hz to 700Hz section more than twice the operating force It was confirmed to represent.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

1 is a perspective view of an inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention.

Figure 2 is an exploded perspective view of the inertial force composite mount for vibration and shock reduction shown in FIG.

Figure 3 is a cross-sectional view of the main portion of the inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention.

4 and 5 are cross-sectional views showing the operating relationship between the piezoelectric actuator and the inertial mass forming the inertial force-type composite mount for vibration and shock reduction according to an embodiment of the present invention.

6 and 7 are cross-sectional views showing the operation relationship between the piezoelectric actuator and the inertial mass forming the inertial force-type composite mount for vibration and shock reduction according to another embodiment of the present invention.

Claims (5)

Center plate; A conical elastic rubber fixed to the center plate and having first and second through holes formed in a thickness direction thereof; A support plate disposed on the elastic rubber; A bottom plate disposed under the elastic rubber, the bottom plate having a coupling pipe coupled to the support plate through the first through hole; A housing inserted into the second through hole and fixed to a lower surface of the support plate; A piezoelectric actuator disposed in the housing and connected in series with the elastic rubber along a load-bearing direction and providing a reaction force against the load applied to the support plate; And Located in the elastic rubber, one end portion is connected to the piezoelectric actuator, including an inertial mass for amplifying the operating force of the piezoelectric actuator, The inertial mass has the same outer surface as the inner circumferential surface of the conical hollow portion formed inside the elastic rubber, but is formed in a conical shape surrounding a portion of the housing and is fitted into the hollow portion. A fastening hole for fastening with the piezoelectric actuator is formed on the bottom surface of the inertial mass, and a through hole for penetrating the coupling tube is formed in the central portion of the inertial mass, and the inertia force complex for reducing vibration and impact Mount. The method of claim 1, The housing is the upper surface is open, the inertial force composite mount for vibration and shock reduction, characterized in that the piezoelectric element of the piezoelectric actuator is coupled to the lower surface of the support plate. delete The method of claim 1, An inertial force-type composite mount for vibration and shock reduction, further comprising a vibration sensor attached to the lower surface of the support plate. delete

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