支柱式前起落架摆振性能研究

摘要

The shimmy of nose landing gear is studied through the method of linear and non-linear theory. The lfexibility of strut and gyroscopic couple is researched by using the method of linear theory. Study on the torsional backlash and coulomb friction is performed by using the method of nonlinear theory. The results show that deifcient lfexibility of the strut can induce“structure shimmy”and increasing backlash of the gear can induce“backlash shimmy”;gyroscopic couple and coulomb friction beneift reduction of shimmy.%为了研究支柱式前起落架的摆振性能，建立了双轮式摆振方程组。在线性参数方面，研究了支柱柔性和陀螺力矩对摆振性能的影响；在非线性参数方面，研究了扭转间隙和库仑摩擦对摆振性能的影响。研究结果表明支柱刚度不足时会发生“结构性摆振”；支柱扭转间隙过大时会发生“间隙性摆振”，这两者必须予以避免；陀螺力矩对摆振影响不大且偏安全，常可忽略；使用过程中库仑摩擦的减小会降低系统的减摆储备能力。