According to the structure and mechanical characteristics, a CFRP (carbon fiber reinforced plastic) periscope outer tube was designed. The parameters were determined such as fiber orientation angles, number of layers, proportion of fiber with different angles, and stacking sequences. A finite element model was built for the analysis of bending strength and modal. A CFRP periscope outer tube specimen was processed for the bending performance test. The results of simulation and experiments show that the CFRP periscope outer tube could meet the requirements.
A design method of carbon fiber composite flywheel, on the basis of the flywheel application background, is introduced in this paper. This method based on the stress distribution of multi-ring interference fit flywheel can quickly design the number of rings and the interference, on the premise that the storage requirement of flywheel energy storage system is met. Compared with the existing design method that is aimed at maximizing energy density and storage, the proposed method in this paper, simpler and faster, lays more emphasis on engineering applications.
Magnetic suspended wind turbine generator is widely studied due to its low loss, low maintenance cost and high reliability. However, affected by the small stiffness of magnetic bearing, the generator shaft supported by magnetic bearing will be eccentric. Therefore, the performance of generator will be affected. A horizontal axial magnetic suspended wind turbine generator is designed in this paper. The variations of shaft eccentricity and Maxwell force of rotor supported by different bearing stiffness are studied. The results show that the shaft eccentricity affects the performance of generator; and the bearing stiffness is the key to reduce those effects. The magnetic bearing designed in this paper can meet the requirements of generator.
According to the requirements of drive shaft, finite element analysis software SAMCEF was adopted in the simulation analysis of Carbon Fiber Reinforced Plastic (CFRP) tube which was the main structure of a CFRP drive shaft, in order to determine the parameters such as fiber orientation angles, number of plies, percentages of fiber with different angles, and stacking sequences. In this paper, the joint between CFRP tube and metal parts was designed. Specimens were manufactured and experiments were carried out. In conclusion, the results of experiments suggested that the simulation analysis predicted well the performances of the designed drive shaft.
Feedforward control method to control vibration in the active vibration isolation system was discussed. By introducing the FIR filter as the feedforward link, using the mean-square deviation of system error as the performance index and utilizing the LMS algorithm to obtain the optimal parameters of controller, the design of adaptive feedforward controller was fulfilled. The simulation results showed that: for the active vibration isolation system with regularly vibration source, adopting adaptive filter method of feedforward control has notable effect. The contrast experiment with using the PID controller further verified the simulation results.
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