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With the rapid development of electronic devices. There are more and more high performance, multi-functional electronic components, at the same time, their size is getting smaller and smaller. This demand has a greatly promoted the development of electronic packaging. Due to the precision of electronic devices, leading to a sharp increase in the current density through the lead wire, can reach the...
This paper presents a hybridized discontinuous Galerkin time-domain (DGTD) method with boundary integral equation (BIE) method to accurately solve the electromagnetic scattering problems. The weighted Laguerre polynomials are chosen as temporal entire basis functions to expand the temporal variables, which makes the proposed scheme free from Courant-Friedrichs-Lewy (CFL) condition and promising for...
Direct driving system consisted of permanent magnet synchronous linear motor (PMSLM) eliminate the power transmission devices so that drastically reduce the gearing range. Compared with a traditional indirect transmission system composed of rotary motor and ball screw, it has a significant advantage over the traditional indirect transmission on dynamic precision, rapidity and stability [1]. According...
A nonlinear fault-tolerant control and active vibration suppression design approach is presented in this paper. In the presence of flexible satellite with actuator faults, orbit control force and environment disturbance, a nonlinear adaptive fault-tolerant control approach is designed for the flexible satellite attitude control system. The control law is based on H-infinite adaptive method and designed...
A robust attitude control approach is proposed for the flexible satellite attitude control system with orbit control force during orbit maneuver. Considering orbit control force and other system internal and external disturbances as one whole unknown bounded disturbance, a robust attitude control approach which is insensitive to parameter perturbations of the flexible satellite attitude control system...
This paper proposes a model and predictive control of a fractionated satellite system by using Mixed Logic Dynamical (MLD) approach. The power management system of a fractionated satellite can be seen as a hybrid system, which includes discrete dynamics, continuous dynamics, and logic rules. Discrete features of the power management system are the different types of flight modes and discrete inputs...
Capability-Based requirements management and planning thoughts and methods have gone increasingly deep into the development of Weapon System-of-Systems (WSoS). In the traditional top-to-bottom capability requirement planning (CRP) methods, the constraints among different capabilities indexes acquired from the tasks decomposition are neglected, which leads to the irrationalities and conflicts between...
Large-scale helicopter group is an important part of the Airdrop Assault System of Systems (AASoS). How to plan the scale of helicopter group and achieve the best operational effectiveness is a focus of the AASoS capability requirement analysis. Based on the macro-micro characteristic of the system of systems and the individual system, airdrop assault combat models are divided into three types separately...
In this paper, we study mean first-passage time (MFPT) for random walks on a network through edge iteration. The feature of this kind of network is that every existing edge gives birth to finite nodes at each step. According to the network structures, we obtain the analytical expression for MFPT, which shows that the MFPT grows as a power-law function with the number of nodes in the large limit of...
Based on the analysis method of CFD-Fluent, and designed the different sinks with five widths and three depths, the variation influence on the performance of the runner of energy conversion was explored by the changing size of the sink, and the brief analysis was given based on the theory of finite wing span and infinite wing span, and the results of numerical simulation were compared with the model...
In this study, the numerical investigation was adopted to analyze the deposition characteristic of polycrystalline silicon in a rib reactor. Fluent 6.2 was utilized to simulate the simultaneous momentum transfer, energy transfer and mass transfer, and to couple the gas-phase reaction with surface reaction in SiHC13 -H2 system. Computed flow structure, thermal and species distributions indicated that...
A novel wide-area fault location algorithm is proposed in this paper. Fault model is developed in super-imposed network, and then based on network correlation coefficient matrix (NCCM), location function is defined. Finally search technique with adaptive step is used to locate fault branch and fault distance. This method requires few PMUs, avoids modifying node admittance matrix and NCCM. It has less...
Human reliability analysis in complicated industrial processes is facing to difficulties, such as insufficient knowledge utilization and simplex analytic means etc. This paper first introduces basic meanings and current research situation of human reliability analysis and qualitative simulation respectively, and then on the basis of it, considering current insufficiency of human reliability analysis...
The present study extended previous research by proposing and empirically testing the relationship between trust in leader and team performance and the model of mediating processes underlying the relationship. The survey was conducted in 75 work team from several cities in China. The hierarchical regression results showed that trust in team leader involved cognition-based trust and affect-based trust,...
Based on reduced model of double-fed direct current motor system (DFDCMS), the state space description and its key states of DFDCMS are advanced. The two wheeled robotpsilas kinematics model and motion-actuator model are analyzed, the state observer based on extended Kalman filter (EKF) of the two wheels mobile robot (TWMR) is used to filter the signal with interference and get the key states. There...
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