Novel annular vibration isolation device for helicopter

Abstract

The invention relates to helicopter vibration attenuation / vibration isolation field, and particularly relates to a vibration isolation device structure for airborne equipment of a helicopter. A novelannular vibration isolation device for the helicopter comprises an upper connecting plate, a lower connecting plate and a plurality of groups of vibration isolation mechanisms. The upper connecting plate and the lower connecting plate are of a hollow annular structure, and the multiple groups of vibration isolation mechanisms are arranged between the upper connecting plate and the lower connectingplate in a surrounding mode. The vibration isolation mechanism comprises connecting supports, vibration attenuation plates, adjusting spring pieces, mass blocks and connecting joints. The vibration attenuation plates are of an arc-shaped structure with the shape matched with the upper connecting plate and the lower connecting plate, the adjusting spring pieces are arranged at the middle sectionsof the vibration attenuation plates, the connecting supports are fixed to the lower connecting plate and are fixedly connected with the vibration attenuation plates and the center of the adjusting spring pieces, the two ends of the spring pieces are adjusted, and the vibration attenuation plates are fixedly connected with the upper connecting plate through the connecting joints. The novel annularvibration isolation device realizes the dual-frequency vibration attenuation under different frequencies of vibration isolation and vibration absorption, has effective vibration isolation performance,has high static connection rigidity, and can meet the large maneuvering flight requirement of the helicopter.

Description

technical field [0001] The invention relates to the field of helicopter vibration reduction / vibration isolation, and relates to a vibration isolation device structure used for helicopter airborne equipment. Background technique [0002] Because of its unique structural form and flight mode, the helicopter has been in a complex aerodynamic environment, resulting in a high vibration environment for the helicopter body structure and on-board equipment. With the improvement of the performance of helicopters, the requirements for airborne equipment are getting higher and higher, and the impact of high vibration levels on the performance of airborne equipment is becoming more and more obvious. Therefore, the demand for vibration reduction / vibration isolation of airborne equipment is also becoming stronger and stronger. . [0003] According to the vibration theory, when the natural frequency of the vibration-isolated object is lower than the excitation frequency Only when it has...

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Problems solved by technology

The linear vibration isolator has the advantages of simple structure and convenient installation, but its disadvantages are also obvious: the main excitation frequency of the helicopter belongs to the medium and low frequency. In order to ensure the installation stiffness of the vibration-isolated equipment, the linear vibration isolator generally has no natural frequency If it is too low, the initial frequency of vibration isolation of the linear vibration isolator is high, and the vibration isolation bandwidth is not wide enough, especially for the vibration isolation effect of low and medium frequencies, and for some airborne equipment with large volume and mass, such as the observation Aiming, etc., because of its large size, large mass and high static stiffness requirements for connections, general linear vibration isolators cannot be used, resulting in the lack of corresponding vibration isolators for such airborne equipment. On existing models Generally, hard connection is used, which makes this kind of equipment in a relatively harsh vibration environment, which affects its service life

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