Gear box additional damping noise reduction method based on modal strain energy

Abstract

The invention discloses a gear box additional damping noise reduction method based on modal strain energy, which comprises the following steps: S1, establishing a gear box model, and carrying out modal analysis; S2, calculating a modal damping ratio of each order modal of the gearbox; S3, constructing a gear box boundary element model and a Box sound field, and calculating an acoustic transmissionvector; S4, performing vibration response calculation; S5, obtaining the relationship between the vibration speed and the sound pressure of the field points, superposing the sound pressure level caused by each node of the gearbox to each corresponding field point, and solving the radiation noise of the field points; S6, adding damping to the area corresponding to the field point with the maximumsound pressure level on the gear box, establishing an additional damping gear box model, and solving the radiation noise; and S7, performing noise reduction after additional damping, the scheme is determined to be a gearbox model with additional damping, noise reduction is not carried out after additional damping, and the step S6 is executed again to change the scheme with additional damping. Themethod is good in noise reduction effect on the gear box, good in practicability and worthy of popularization.

Description

technical field [0001] The invention belongs to the technical field of mechanical damping, and in particular relates to a noise reduction method for gear box additional damping based on modal strain energy. Background technique [0002] In the modern machinery industry, the vibration of the mechanical structure not only increases the instability of the mechanical structure, but also generates large noise and pollutes the environment. Therefore, the noise reduction design of the mechanical structure is the key to the current research. At present, there are still many deficiencies in the design methods of additional constrained damping structures: the optimal design of additional constrained damping structures is not systematic and effective enough, without considering the load on the structure, and most of them are applied to flat plate structures, which have certain particularities and limitations. Limitations: There is still a certain blindness in the design of additional d...

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Problems solved by technology

At present, there are still many deficiencies in the design methods of additional constrained damping structures: the optimal design of additional constrained damping structures is not systematic and effective enough, without considering the load on the structure, and most of them are applied to flat plate structures, which have certain particularities and limitations. Limitations: There is still a certain blindness in the design of additional damping for complex structures such as gearboxes, and there is a lack of fast and effective noise reduction design methods

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