Abstract
Landing gear is a key load-bearing structure of aircraft during ground operation, and the landing capacity of landing gear is determined by the performance of buffer. To solve the problem of buffer failure caused by insufficient static sealing of a rubber ring at groove side, a new structure of a butterfly rubber ring is proposed by analyzing the factors affecting sealing performance of the rubber ring. First, the constitutive equation of rubber material is derived based on the theory of hyper-elasticity, and the material parameters are obtained by fitting the experimental data. Then, by analyzing the simulation method of installation mode and installation stroke, the simulation method suitable for calculating the sealing performance of the rubber ring is established. The linear fitting formulas with Pearson coefficient greater than 0.92 are used to discuss the influence of pre-compression rate and hydraulic pressure on the sealing performance of the rubber ring. Compared with O-ring, the contact pressure of butterfly-ring is increased by 30% in assembly state and 14% in working state. The results show that the butterfly rubber ring has excellent static sealing performance. It is concluded that improving the configuration of the sealing ring can solve the insufficient unilateral sealing of the hydraulic buffer.
Highlights
Landing buffer capability of landing gear buffer is the key to evaluate landing gear performance, especially for carrier-based fighter and hypersonic aircraft [1]
The results show that the butterfly rubber ring has excellent static sealing performance
The research on the factors affecting the sealing performance of the rubber ring is helpful to calculate the sealing performance of the rubber ring and improve the accuracy of buffer design
Summary
Landing buffer capability of landing gear buffer is the key to evaluate landing gear performance, especially for carrier-based fighter and hypersonic aircraft [1]. After buffering the ground load by the buffer, the damage caused by the ground load on the landing gear can be reduced, and the service life of the landing gear can be improved. The basic requirement of buffer design is good sealing performance [2]. Rubber material has hyperelastic performance, which is widely used in the sealing structure of buffer. As the main seal of hydraulic buffer, the sealing performance of O-ring is directly related to the working performance of buffer [3]. The research on the factors affecting the sealing performance of the rubber ring is helpful to calculate the sealing performance of the rubber ring and improve the accuracy of buffer design
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