JPH071348U - Dynamic Vibration Absorber for Steel Structure Using Shear Deformation Spring of Vibration Isolating Rubber - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Vibration absorption of a steel structure that resonates by vibrating force without using electricity or mechanical devices. [Structure] The two-mass spring system composed of the weight 2, the vibration-proof rubber 1, and the structure to be absorbed absorbs the structure to be absorbed.

Description

[Detailed description of the device]       [0001]     [Industrial applications]   The present invention is to absorb the vibration of a steel structure that resonates with an exciting force.       [0002]   For example, when navigating a ship with radar masts, funnels, dodgers, etc. A device that absorbs vibration by avoiding the resonance phenomenon caused by the propeller of the It can be used as a table.       [0003]   INDUSTRIAL APPLICABILITY The present invention is used as a dynamic vibration absorbing device that does not use electric or mechanical devices.       [0004]     [Prior art]   Conventionally, in many cases, the structure that resonates and vibrates significantly is reinforced to increase rigidity and The method was to reduce the vibration by catching up with the frequency.       [0005]     [Problems with conventional technology]   In the conventional technology, a propeller at the planning stage can be used for a complicated structure such as a ship. In terms of accuracy, it is difficult to examine whether or not it resonates with the vibration source such as the main engine. In many cases Therefore, an exciter experiment was conducted to grasp the natural frequency, and the steel structure did not resonate during navigation. I'm deciding how. Reinforcement work will be performed at this point if necessary.       [0006]   On the other hand, when the target structure is reinforced, the weight increases considerably, and in many cases, Since the structure around the is completed, the lining of the living area is removed, the wiring is relocated, etc. However, there is a problem that a relatively large additional work is required.       [0007]     [Means for solving the problem]   The dynamic vibration absorber of the present invention is used as a vibration isolation device for a resonating target structure. .       [0008]   To explain this with reference to FIG. 1, the weight 2 as the mass is , The anti-vibration rubber 1 is detachably attached to the anti-vibration rubber 1. 6 are attached to the pedestal 4 respectively. The pedestal 4 is attached according to the main vibration direction of the object. The weight 2 and the vibration-proof rubber 1 can be attached and detached by the bolts and nuts 3 and 6, respectively. The structure that can select the weight 2 and the vibration-proof rubber 1 according to the natural frequency of the vibration absorption target It has become.       [0009]     [Work]   The principle of the dynamic vibration reducer of the present invention is as follows.       [0010]   If the vibration absorption target and the vibration absorber are replaced with a vibration model, damping is performed as shown in Fig. 2. The spring on the vibration absorber side that is considered a two-mass spring system is a rubber spring, and the damping is vibration-proof. The rubber itself has a value that is suitable for use as a dynamic vibration absorber. Conventionally, anti-vibration rubber is often used as an axial spring. The feature is that the shear direction is soft enough.       [0011]   Fig. 3 shows the operating state of the vibration absorber as a conceptual diagram.       [0012]   In the case of a ship, the target structure resonates due to the vibration force of the propeller or main engine. Then, excessive vibration occurs, but at this time, it is almost the same as the natural frequency of the target structure. When the dynamic vibration absorber of the present invention with a certain number is installed, the coupled effect of the vibration system shown in Fig. 2 As a result, the vibration of the target structure is reduced.       [0013]     [Effect of device]   The dynamic vibration absorber has a simple structure that does not include power devices such as weights, anti-vibration rubber, and pedestals. Also, by making each removable, it has versatility and is unique to the structure to be absorbed. It is easy to synchronize with the frequency.       [0014]   That is, by the action of the above-described dynamic vibration absorber of the present invention, it is supplemented to a steel structure having a natural frequency. Reduces additional work associated with strength or reinforcement, and prevents deterioration and damage to auxiliary equipment can do.

[Brief description of drawings] FIG. 1 is an overall perspective view showing a vibration absorber. FIG. 2 is a two-mass system damping vibration model diagram. FIG. 3 is a vibration mode diagram of the vibration absorber. FIG. 4 is a front view of the vibration absorber. 5 is a sectional view taken along line CC of the vibration absorber shown in FIG. [Explanation of symbols] 1 anti-vibration rubber 2 weights 3 Bolt nut for weight stop 4 pedestal (sheet) 5 Vibration absorption target 6 Anti-vibration rubber mounting nut Weight of A1 vibration absorber A2 Vibration absorber spring A3 Vibration absorber attenuator A4 Weight of vibration absorption object A5 Spring of vibration absorbing object A6 Attenuator for objects to be sucked B vibration mode

Claims (1)

[Claims for utility model registration] [Claim 1] As a vibration isolation device for a resonating target structure, a vibration isolation rubber, a weight as a mass detachably attached to the vibration isolation rubber, and Dynamic vibration absorption characterized by consisting of a pedestal for fixing anti-vibration rubber and combining shear deformation spring constant of anti-vibration rubber or number and weight in order to have almost the same frequency as the target structure. vessel.