A parameter optimization method for pull rod for installing aircraft airborne equipment

Abstract

A parameter optimization method for pull rod for installing aircraft airborne equipment is disclosed. An aircraft A nonlinear stiffness element is used to simulate the vibration damping device installed in airborne equipments, the nonlinear finite element model of equipment installation pull rod is established, the structural parameters of pull rod are taken as optimization variables, the finite element model is parameterized, a parameterized model with the structural parameters of pull rods as variables is established to determine the constraint conditions and optimization objectives. Given the initial value of the optimization variables, the initial population is generated by using a genetic algorithm program, and the objective function is calculated to generate the next generation of population. step 5 is repeated until the convergence criterion is satisfied, and the final parameters of the pull rods are obtained, and the optimization is finished.

Description

technical field [0001] The invention belongs to the installation design technology of aircraft airborne equipment, and relates to a parameter optimization design method of a tie rod for installing airborne equipment. Background technique [0002] Aircraft airborne equipment can be connected and fixed with the aircraft body through tie rods, and vibration damping devices will be installed at the joints of the tie rods to prevent the vibration of the aircraft body from being transmitted to the airborne equipment to affect the performance of the equipment or the vibration of the airborne equipment to be transmitted to the aircraft body. Airplane flight safety. In aircraft design, the parameter design of tie rods, including the length and diameter of tie rods, wall thickness, materials and other parameters, is the focus and difficulty of design. At present, on the premise that the tie rods of aircraft airborne equipment are conveniently connected with the airframe structure, th...

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Problems solved by technology

At present, on the premise that the tie rods of aircraft airborne equipment are conveniently connected with the airframe structure, the shock absorber is simplified into a linear unit for simple tie rod parameter optimization, but for most of the vibration damping devices, they have strong Non-linear characteristics, the use of existing equipment tie rod optimization methods cannot ensure that the weight of the tie rod is the lightest when the equipment is installed reliably and the performance indicators of the equipment are met

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