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The microseismic (MS) monitoring in the coal mining provides a powerful method to identify the coal mine geological hazards as well as to prevent against the illegal mining. The challenge of MS monitoring is to extract characteristics of interest from the collected raw MS signals and locate the MS events using effective algorithms. In order to improve the localization accuracy of microseismic sources,...
This paper is concerned with the problem of finite-time H2/H∞ control for linear stochastic systems. First, a new definition of finite-time H2/H∞ control is given. Second, some sufficient conditions for the existence of finite-time H2/H∞ control are obtained, and the relationships among transient performance, H2 performance index and H00 performance index are represented by an algorithm. Finally,...
This paper addresses the issue of lag consensus of the leader-following multiagent systems with communication delays and switching topologies. Lag consensus means that the states of the followers lag that of the leader. Based on the graph theory and the common Lyapunov-Krasovskii functional method, we design a protocol ensuring the lag consensus of multiagent systems with communication delays under...
Fast, on time and large transport capacity, cleaning and other factors make cities gradually increasing demand for urban rail transit, and demand is growing faster than construction speed, so it is necessary to ensure the transport capacity to improve the operations quality of service. At the same time the discretion of the rail transit quality of service affect the choice of rail transit passenger...
In order to solve a series of problems caused by photovoltaic (PV) off-grid, PV must have the low voltage ride through (LVRT) capability ensuring grid-connected operation and outputting reactive power to power grid within a certain time range. At present, the control strategies of PV grid-connected inverter under balance fault have been used effectively. However, the strategy of keeping the inverter...
A more powerful mini-type tripod head for laser goniometer was designed. Using high frequency and a large number of I/Os of the CPLD, 13 bits optical encoder dates of two channels could be received and processed, and the processed data could be delivered to the MCU in real time. Due to plenty of communication interfaces of the MCU, communication with the laser irradiator, north finder and upper computer...
To solve the problem of training rate decline in neural network caused by too much noise in the traditional image, a new method of expression recognition based on CNN was proposed. First, in order to narrow the face range, face image could be detected from the original image by using the AdaBoost cascade classifier. Then, the coordinates of the eye, mouth and other key parts and brow, nasolabial and...
With the application of modern communication, control and measurement technology based on microelectronics and computer, a large number of microelectronic devices have been applied in the power generation, transmission and production links of power plants. In order to ensure the safe operation of all kinds of electronic equipment, it is necessary to install surge protector (SPD). In this paper, MATLAB...
Body surface potential mapping (BSPM) can give an insight of heart status in cardiovascular disease diagnosis. However, most special BSPM recording devices are cost and relatively rare. An alternative method is proposed for BSPM recording using two common 64 leads electroencephalogram (EEG) amplifiers. The recording technics includes 117 torso and three limb electrodes of silver-silver chloride, and...
The evaluation of intelligent transformation level of primary equipment in substation is an important part of the second batch of intelligent substation pilot project. In this paper, pilot projects for the transformation of smart substations in several regional power grids are extensively investigated, of which the following work is done on the basis: Firstly, the evaluation model of intelligent transformation...
In this paper, we employ a macroscopic traffic model and RBF neural network to address highway density control problem. This control system is a nonlinear feedback closed-loop system. Firstly, a popular traffic model called the LWR (Lighthill-Whitham-Richards) model is formulated. Secondly, a direct RBF neural network control for discrete-time nonlinear systems is introduced. The control algorithm...
A robust model predictive control approach for a class of uncertain continuous systems with nonlinear disturbance and state-delay is proposed. The designed robust controller guarantees the closed-loop system asymptotically stable and the receding horizon performance index online minimum. Based on receding optimization principle of predictive control, the infinite time domain optimization problem is...
Aiming at that it is difficult to choose the value of virtual damping(VD) in passivity-based controller of the Boost converter, this paper proposes an approach which can be used to calculate and optimize the value of VD. The range of VD can be determined by constraining overshoot of the current response of Boost converter. The optimal VD can be found in the range of VD by genetic algorithm(GA) and...
This paper mainly studies a new road curvature estimation method for self-driving vehicles. A new contour-based clustering and the parallel-based voting mechanism are used to detect the lanes. And curve fitting with least square error method is used to fit the lane models. Compared with other methods, this method can estimate the road curvature and width in advance to help a vehicle pass the curve...
In this paper, a scheme of small body autonomous optical navigation is presented which takes the opportunity feature region (OFR) as the navigation characteristic, aiming at the requirements of autonomy, real-time and navigation precision for small body exploration mission. The search criterion of the OFR is given after defining the OFR. Then, perform the detection and matching process of OFRs in...
In this paper, the impact of products exchange policy on the bullwhip effect of remanufacturing closed-loop supply chain was studied, and the system dynamics model of remanufacturing closed-loop supply chain system with uncertain products exchange percentage, collection percentage and remanufacturing percentage was built. The mathematic relationship between stock-flow diagram and variables was explained,...
Based on the impedance stability analysis method, in this paper, the factors that might lead to sub-synchronous oscillation(SSO) were analyzed from the line parameters, internal control parameters and other aspects for solving the SSO problems caused by some parameters were set unreasonable for Double Fed Induction Generator(DFIG) to access the VSC-HVDC system. Firstly, the AC-side small-signal impedance...
As an efficient transportation tool, the tower crane is widely used in construction production. To improve the working efficiency, some automatic control methods have been proposed for the tower crane system, including some open loop methods, like input shaping methods, trajectory planning methods, and so on. However, generally, tower cranes usually work in outdoor environment, which are sensitive...
In order to solve the poor dynamic characteristics and adjustment effect of traditional voltage filter control system of welding machine. In this paper, the mathematical model of the voltage filter control system of welding machine is established, and the fuzzy control rule is applied to the Voltage Control System, and two improved fuzzy control schemes including fuzzy-PID compound control and fuzzy...
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