基于正交法的过盈自锁液压支腿锁紧特性

Locking Performance of Interference Self-Locking Hydraulic Outrigger Based on Orthogonal Method

过盈自锁液压支腿具有锁定刚性好、锁紧位置精度高等显著优点,但环境温度、摩擦因数和锁紧位置等对其锁紧性能具有重要影响,且各参数间还存在交互作用。提出采用正交法研究过盈自锁液压支腿的锁紧特性,基于环境温度、摩擦因数、锁紧位置3个因素和实际工况中对应的5个水平进行正交设计,通过有限元法获得液压支腿锁紧力的变化情况,并研究3种因素对锁紧力敏感性的影响:通过极差法和方差法分析了各个因素对液压支腿锁紧力的影响程度,发现摩擦因数对锁紧力的影响最大,环境温度次之,锁紧位置影响最小;通过回归分析建立了锁紧力与环境温度、摩擦因数和锁紧位置的函数关系,并通过数值仿真验证了该方程的有效性,为过盈自锁液压支腿的设计及研制提供参考。

The interference self-locking hydraulic outrigger has obvious advantages of good locking rigidity and high locking position accuracy.However,the locking performance is significantly affected by the ambient temperature,friction coefficient and locking position,and there are interactions among various parameters.The locking performance of interference self-locking hydraulic outrigger was studied by orthogonal method.Based on the ambient temperature,friction coefficient and locking position and the corresponding five levels in the actual working condition,the orthogonal design was carried out.The variation of the locking force of the hydraulic outrigger was obtained by finite element method,and the influence of the three factors on the sensitivity of locking force was studied.The influence of various factors on the locking force of hydraulic outrigger was analyzed by range method and variance method.It is found that the friction coefficient has the greatest influence on the locking force,followed by the environmental temperature,and the locking position has the least influence.The function relationship between the locking force and the ambient temperature,friction coefficient and locking position was established by regression analysis,and the validity of the equation was verified by numerical simulation,which provided a reference for the design and development of interference self-locking hydraulic outrigger.