Calculation of damping of 3-dimensional braided composite beam and its optimum design

摘要

The 3-dimensional braided composite beam is studied in this paper.Based on the damping element model and the expression of dissipation energy of the 3-dimentional braided composite materials,a method for calculating the damping of 3-dimensional braided composite beam is given,and the formula for calculating the specific damping capacity of such kind of beam is derived.At the same time,the optimization synthesis of the beam is done using the constrained variable metric optimization method by looking the maximum damping as optimization objection,the stiffness and process requirements as the constraint condition and the fibre braided angle and cross-section dimension of beam as the design variables.A numerical example is given in the end.