Abstract: Hydraulic cylinder has great potential for lightweight in aerospace, engineering machinery and other fields, among which carbon fiber is one of the key directions to replace metal. In the past, the design of fiber reinforced layer of carbon fiber hydraulic cylinder is mostly based on engineering experience, and there is no forward design method. Due to the strength and stiffness of carbon fiber reinforced layer directly by the total number of layers of carbon fiber, and the angle of each layer in the layer of comprehensive decision, so in order to meet the demand of the hydraulic cylinder pressure and seal design, proposes a carbon fiber cylinder fiber reinforced layer of the top-down design method, to determine the total number of layers of carbon fiber reinforced layer and each layer of layer angle. The design method can be divided into two steps. The first step is to determine the total number of fiber layers by using composite material mesh theory. The second step is to obtain the Pareto front of high-quality solution set by using multi-objective particle swarm optimization algorithm based on the mechanical model of laminated cylinder, and then select the most appropriate Angle layering scheme according to the evaluation function. An example is given to obtain the best layering scheme by setting forward calculation method, the stress is calculated by finite element, and the strength is checked according to CAI Wu strength theory. After comparing with the results calculated by forward design method, the feasibility of the forward design method is proved. According to the simulation data, the influence of layering Angle on the strength and stiffness is analyzed. Finally, taking the best layering scheme as an example, it shows that the carbon fiber reinforced layer has a good weight reduction effect compared with the replaced metal.

Key words: hydraulic cylinder, lightweight, carbon fiber, fiber reinforced layer, layer, forward design