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In order to make the electromechanical actuator have the ability to adapt to the irregular installation space of high speed aircraft and the great dynamic characteristics, an adjustable actuator based on slider-crank structure was proposed and its transmission characteristics were studied. Firstly, the uniform nonlinear transmission ratio model is obtained respectively by applying speed synthesis...
This paper shows the design of a self-powered wireless digital sun sensor (including magnetometer). The information of satellite attitude and magnetic field intensity can be transferred to the attitude determination and control system (ADCS) through Bluetooth. Four solar cells in parallel connection and a super capacitor make sure that the sun sensor can work both in sunshine and shadow areas. The...
General queueing modeling method, Stochastic Timed Automation, is employed to model the Semiconductor Wafer Fabrication System because of its flexibility and fidelity. The machine allocation is formulated as a stochastic integer programming problem with the objective to optimize the throughput of the Semiconductor Wafer Fabrication System. And we propose an Optimal Computing Budget Allocation-based...
In the power system, earth electrode is buried in the soil for current overflowing, to ensure secure and stable operation of power grid and electric equipment. When the DC transmission system is in the unipolar-earth mode, the ground electrode may assume a large positive DC or negative DC, which has an important effect on the electrochemical corrosion of the ground electrode in the soil environment...
This paper discusses how to apply virtual prototype technology to analyzing driving mechanics of the patrol robot for belt conveyor. Virtual prototyping model has been established for inspection robot, and simulation experiments has been completed in planar motion and climbing movement simulation. By analyzing the simulation results, Wheel-rail inspection robot has good driving characteristics in...
It is very important to analyze the dynamic characteristics for the crankshaft during the working process. By use of ANSYS software of finite element model of the crankshaft modal analysis to get the top 20 order natural frequency and the corresponding vibration mode, and put forward the possible resonance risk and design concerns. It has some guiding significance for the design and manufacture of...
For the miniaturization of two-dimensional autocollimator, a method of using embedded measurement system instead of special host computer is presented. This system integrates CMOS image sensor's driving circuit, frame processing, adaptive exposure control, centroid subdivision and localization of cross, misalignment angle calculation, display driver and other functions within a FPGA chip, and the...
A new method, based on support vector machines (SVMs) and genetic algorithm (GA), is proposed for automatic Intra-Pulse modulation recognition (AIMR). In particular, the best feature subset from the combined pulse descriptor word (PDW) feature set and time-frequency feature set is optimized using genetic algorithm. Compared to the conventional decision-theoretic method, the method proposed avoids...
Action recognition is still a challenging problem. In order to catch effective compact representation of the action sequences, the discriminative dictionaries could be learned by sparse coding. But sparse coding is needed in both the training and testing phases of the classifier framework. And it is also time consuming for the adoption of 1-norm sparsity constraint on the representation coefficients...
In this paper, the Beidou satellite navigation system based on the establishment of Beidou Positioning base station, select the cloud platform RTK forwarding mode, using ARM9 processor as the main controller, through the PID to adjust the output control signal, sending CAN communication instructions to control the hydraulic system to complete the intelligent agricultural machinery automatic control,...
In order to solve the problem that the existing parallel manipulator is expensive, complicated design and complicated control, this paper designs a three-degree-of-freedom parallel manipulator with cam-driven single power input. The manipulator is cheap and widely used. And then its kinematics research. The freedom degree analysis of the manipulator is completed, and the kinematics is obtained. And...
The cam-type ATC manipulator has the advantages of fast tool changing and high efficiency, but the structure is complex and difficult to design. This paper proposed a new method of globoid cam 3D modeling for ATC manipulator-double-globoid cam mechanism, which could solve the design problem of the cam-type ATC device. Then, the multi-ridge dynamics model of the cam-type ATC manipulator was established;...
This paper is a study to the application of graph traversal algorithms in static Timing Analysis (STA) module of Electronic Design Automation(EDA) tool. After Field Programmable Gate Array (FPGA) read into the design circuit, it replaces circuit with UDM (Universal Design Methodology) netlist internally. STA module does not work directly on the netlist, but converts the netlist to timing graph that...
In the microphone array speech enhancement, The coherent noise has a great influence on the accuracy and speech leakage of the delay estimation in the beamforming algorithm. In this paper, the wavelet threshold denoising method is effectively combined with the beamforming algorithm to acting on every signal of microphone array. It can eliminate coherent noise in the signal to reduce noise-induced...
Based on the variable step-size afïîne projection algorithm, the idea of multiple forgetting factors and variable projection order is proposed. On the one hand, the accurate estimation of error energy is realized in order to achieve faster convergence rate and lower final misalignment. On the other hand, the reduction of computational complexity can be achieved. The simulation results show that the...
The best service systems aren't just cost-effective. They also respond quickly, handle smoothly and recover promptly from disruptions. This paper proposes a linear piece-wise recovery function and applies it to the decision-making processes of improving a service system's resilience to disasters. A numeric example is developed to demonstrate the proposed model enables tradeoff between a cost minimum...
A multi-standard analog front-end architecture SoC (System on Chip) for 13.56MHz radio frequency is proposed. It consists of a transmitter and a receiver. The transmitter adjusts its ASK modulation index with a digitally controlled mode select register, thus supporting RFID standards of ISO/IEC 14443 Type A/B. In the receiver, an envelope detector, a variable gain amplifier and a shaping circuit are...
Stepping motion is the movement of output execution with fixed period of motion, and the cam type manipulator has the characteristics of steady movement, accurate transmission, controllable working speed and low cost. According to the output step action design 6 different types of cam mechanism(plane groove cam, cylindrical cam, globoidal cam mechanism with cylinder cam mechanism, plane groove cam-cylindrical...
Deep Fuzzy C-Means algorithm is applied to determine veiled structure in the data set. It is commonly used when data boundaries are not clearly defined and extra parameters are needed to reduce the statistical closeness. In this paper, we propose a semi-supervised deep fuzzy C-Means algorithm that accommodates this intangibility. It is applicable to machine learning methodology that relies on algorithmic...
This paper presents the biological control for a radially free distributed hexapod robot. The CPG(central pattern generators) network consists of six CPG units based on Hopf neural oscillator that used to generate rhythmic oscillatory signals for the end trajectories of legs. The ring-type network topology of CPG network that consists of six CPG units is established. By computing the inverse kinematics,...
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