For the sample of traction mechanism in tower hoist
considering the random character of the value of design parameters and being satisfied with the conditions of load-bearing capacity and distribution of transmission ratio
the maths model in fuzzy design optimization is set up which is to minimize the center distance of reducer in lift mechanism.As there is the problem of low efficiency and local optimum in traditional optimal methods
genetic algorithm is adopted to solve the optimization model
so that the optimization process is simplified and global optimum is acquired reliably.