H_∞ synchronization of the coronary artery system with input time-varying delay

This paper investigates the H_∞ synchronization of the coronary artery system with input delay and disturbance.We focus on reducing the conservatism of existing synchronization strategies.Base on the triple integral forms of the Lyapunov–Krasovskii functional(LKF),we utilize single and double integral forms of Wirtinger-based inequality to guarantee that the synchronization feedback controller has good performance against time-varying delay and external disturbance.The effectiveness of our strategy can be exhibited by simulations under the different time-varying delays and different disturbances.     

Testing the validity of the Ehrenfest theorem beyond simple static systems: Caldirola–Kanai oscillator driven by a time-dependent force

The relationship between quantum mechanics and classical mechanics is investigated by taking a Gaussian-type wave packet as a solution of the Schr o¨dinger equation for the Caldirola–Kanai oscillator driven by a sinusoidal force. For this time-dependent system, quantum properties are studied by using the invariant theory of Lewis and Riesenfeld. In particular,we analyze time behaviors of quantum expectation values of position and momentum variables and compare them to those of the counterpart classical ones. Based on this, we check whether the Ehrenfest theorem which was originally developed in static quantum systems can be extended to such time-varying systems without problems.     

Microscale vortex laser with controlled topological charge

A microscale vortex laser is a new type of coherent light source with small footprint that can directly generate vector vortex beams. However, a microscale laser with controlled topological charge, which is crucial for virtually any of its application, is still unrevealed. Here we present a microscale vortex laser with controlled topological charge. The vortex laser eigenmode was synthesized in a metamaterial engineered non-Hermitian micro-ring cavity system at exceptional point. We also show that the vortex laser cavity can operate at exceptional point stably to lase under optical pumping.The microscale vortex laser with controlled topological charge can serve as a unique and general building block for nextgeneration photonic integrated circuits and coherent vortex beam sources. The method we used here can be employed to generate lasing eigenmode with other complex functionalities.     

Tomograms for open quantum systems: In(finite) dimensional optical and spin systems

Tomograms are obtained as probability distributions and are used to reconstruct a quantum state from experimentally measured values. We study the evolution of tomograms for different quantum systems, both finite and infinite dimensional. In realistic experimental conditions, quantum states are exposed to the ambient environment and hence subject to effects like decoherence and dissipation, which are dealt with here, consistently, using the formalism of open quantum systems. This is extremely relevant from the perspective of experimental implementation and issues related to state reconstruction in quantum computation and communication. These considerations are also expected to affect the quasiprobability distribution obtained from experimentally generated tomograms and nonclassicality observed from them.     

Acoustic attenuation analysis of network systems by using impedance matrix method

An impedance matrix method is proposed to predict the acoustic attenuation characteristics of network systems. The system may contain several silencer modules and each module may be composed of complex components such as multiply connected tubes, portions with any-shaped cross-section and dissipative parts. The technique of substructuring is adopted and the system is divided into several substructure modules. Three strategies: boundary element method (BEM), numerical point collocation approach and numerical mode matching technique are introduced and the impedance matrix of each module may be computed by a certain appropriate methodology according to the dimensions and geometry of the substructure. Impedance matrix synthesis is employed to obtain the resultant impedance matrix and then transmission loss may be calculated. All the calculation results are verified by experimental measurements and 3-D BEM predictions.     

An evaluation method for measuring SPL and mode shape of tire cavity resonance by using multi-microphone system

This paper presents an evaluation method for measuring the sound pressure level and mode shapes of tire cavity resonance by using a multi-microphone system. Two commercial tires were evaluated to compare abilities of noise suppression by means of this method in the range of the first resonance from 200 to 260 Hz. One tire was a special tire that suppresses tire cavity resonance with polyurethane foam mounted on the tire’s inner liner. The other tire was a normal tire with no polyurethane foam. The mode shape change from vertical to horizontal direction in both tires. However, the sound pressure level of the special tire was lower than the normal tire at all frequencies.     

基于全局灵敏度的电路系统激励与测点优选

针对模拟电路系统级故障诊断问题,提出一种基于全局灵敏度的测试点与测试频率优选方法。利用Pspice软件进行参数分析,避免了电路的拓扑分析和冗繁的计算过程,节省了时间开销,综合考虑元件参数变化影响,定义了网络全局灵敏度的概念,并以此为依据比较不同频率下测点的故障诊断能力,实现测点与测试频率的优选。通过实验仿真验证了方法的有效性,结果表明新方法提高了对系统的故障识别率。     

数据链组网与数据传输仿真技术

研究数据链系统中的组网与数据传输技术,对于构建自主的数据链系统以及数据链系统的测试、评估极为关键。同时,进一步验证所设计的数据链系统的有效性、理解数据链的主要功能与性能参数,为进一步研究与设计测控数据链技术奠定基础。对数据链系统及数据链组网与数据传输技术进行了分析,并简要介绍不同数据链系统的组网与数据传输技术的差别,在此基础上提出一种数据链组网与数据传输仿真系统方案,对系统的功能和工作过程进行了分析,为数据链的构建、测试及评估提供支持。最后,对数据链及其测试评估系统构建及发展趋势进行了展望。该研究在数据链测试仿真评估系统中的验证效果良好,从而为数据链系统的设计提供了参考和依据。     

同步数字体系网管信息提取与插入系统的设计

现有的不同厂家的SDH设备网管信息不能实现互通,为了解决这一问题,提出了一种SDH网管信息提取和插入系统的软硬件设计方案,主要包括网管信息的提取和插入、HDLC数据的封装和拆封、利用主控制器和USB模块进行数据传输,从而实现网管信息的高速上传并在上位机实时显示和保存功能。最后对该系统进行了测试验证,结果表明该系统能分析不同的SDH设备网管信息,为网管信息互通提供了基础信息。     

基于生产者/消费者设计模式的应力波信息采集系统的设计

以LabVIEW14.0为虚拟仪器软件开发平台,采用生产者/消费者设计模式的控制策略、技术数据管理流(TDMS)二进制文件储存策略和SQL数据库及事件结构相结合的实时更新策略,设计了集实时信息采集、储存、显示等功能于一体的应力波采集系统;3种控制策略相结合,解决了传统顺序结构设计模式下程序循环周期长、执行效率低的问题,而且解决了实时采集过程中数据的快速、大容量储存问题,实现了采集过程中采集参数的实时更新;实验结果表明该应力波采集系统具有响应速度快、执行效率高等优点。