摘要：A novel design is proposed for highly sensitive surface-plasmon-resonance sensors. The sensor is based on a microstructured optical fiber with two layers of annular-shaped holes. A gold layer is deposited on the inner surface of the second hole-layer, in which the holes have several micrometers thickness in size, facilitating analyte infiltration and metal layer deposition. In the first layer of holes, the sector-ring^shaped arms, used as supporting strips, are utilized to tune the resonance depth of the sensor. Numerical results indicate that the sensor operation wavelength can be tuned across the C＋L-band. The spectral sensitivity of 1.0.104 nm. RIU-1 order of magnitude and a detection limit of 1.0.10-4 RIU order are demonstrated over a wide range of analyte refractive index from 1.320 to 1.335.

摘要：近年来分数阶微积分理论在永磁同步电机(PMSM)中的应用得到广泛研究。PMSM是典型的多变量耦合、非线性系统,且其运行过程中存在参数摄动和负载扰动。为提高PMSM的动态性能以及对负载扰动的鲁棒性,设计了基于改进型指数趋紧率的PMSM分数阶滑模控制器(FOSMC)。构建了硬件在环实时仿真试验系统,然后在Simulink/Qua RC环境下,对所设计的控制器进行试验验证,并和传统整数阶滑模控制器(SMC)做了性能比较。试验结果表明,所设计控制器具有良好的动态性能,且可以减少系统抖振,并对负载扰动具有更强的鲁棒性。

摘要：在高速微铣削加工过程中,提高生产效率和零件质量的需求日益强烈,这使得机床一直在系统的动态稳定性极限附近工作,而机床颤振的存在是限制微铣削加工生产率的主要障碍。基于颤振稳定性的准确预测,能采取一些措施来提高动态稳定性极限,例如通过改变铣刀结构。提出了数值分析与铣削实验相结合的方法,采用变齿距微铣刀来研究铣削加工的动态特性和稳定性。另外提出了采用时域仿真的输出力来表征加工稳定性的新方法,采用变齿距铣刀可以非常有效地提高某些速度范围的颤振稳定性。对于选定刀具的加工,这种方法可以用于加工优化,或在设计阶段预测刀具新型结构的性能。