永磁行星齿轮传动系统受迫振动分析

获得满意的传动系统动力学特性需要合理选择设计参数.为此,对永磁行星齿轮传动系统受迫振动时域和频域响应进行了求解,分3 种激励条件对该系统进行了时域和频域响应分析,讨论了系统磁性能参数对该系统频域响应的影响规律.结果表明：只考虑输出端激励时系统各部件动态位移响应较只考虑输入端激励时大,磁性能参数对各构件的低频振幅影响比较大,进行结构设计时要合理选择参数,避免系统各部件产生较大的振动.

Forced vibration analysis of permanent magnetic planetary gear drive

Inter-layer hierarchical network code is a special type of multi-rate linear network code, which combines the advantagesof layered source code and inter-session linear network code. Compared to the layered multicast network code, inter-layer hierarchicalnetwork code can take higher utilities of the network resources. The optimization of the code types＇ allocation for the interlayerhierarchical network code in the single-source heterogeneous-receivers network is investigate in this paper. Based on the differentialevolution algorithm, a fast searching strategy is proposed. This strategy emphasizes the optimization of the code types onthe outgoing links of the source node. All evolutional processes are designed according to the special characteristics of inter-layerhierarchical network code. Simulation results showthat higher network throughputs can be achieved by the inter-layer hierarchicalnetwork code with the optimization strategy proposed in this paper, compared to the existing heuristic method.