A new estimation method by the swarm intelligent optimization algorithm is presented to recover transmitted data bits and code of spread spectrum signal over additive white Gaussian noise channel, while receiver has no knowledge transmitter spreading sequence, only knows length sequence. The Artificial Fish Swarm Algorithm (AFSA) insensitive initial values, a strong robustness, faster convergence speed better precision than Genetic (GA) Particle Optimization (PSO). results show that can...

A method to simulate residual stress field of planetary gear is proposed. In this method, the finite element model established and divided tooth zone profile zone, whose different temperature set. The gear's simulation realized by thermal compression generated difference. Based on simulation, train established, dynamic meshing process simulated, influence equivalent addendum, pitch circle, dedendum internal external analyzed, according non-linear contact theory, thermodynamic theory. results...

When the power system breaks down or unit is shut due to equipment maintenance, emergency control measures such as load cutting should be taken ensure stable operation of system. With expansion grid scale and complexity structure caused by new energy grid-connection, traditional physical modeling method difficult accurately reproduce characteristics grid, it impossible get an effective scheme in a short time. From perspective data analysis, this paper analyzes sorts out environment generates...

Parallel robots have good performance in terms of rigidity, accuracy and dynamic characteristics. In this paper, a 2-DOF redundantly actuated parallel robot is taken as the object study. Diagonal recurrent neural network (DRNN) known for its mapping fit nonlinear dynamical systems. A PID controller which composed conventional control DRNN proposed. The makes up deficiency control, strengthens adaptivity whole system. applied to compare with proposed controller. two controllers are used track...

According to the real structure and work condition in recycling generating electricity project, a fluid-structure interaction (FSI) system model of high-flow control valve is set up. The flow pressure coupling uncoupling are investigated. Representative points close selected as targets, accuracy studied. impact FSI on analyzed. It has an important guiding significance for numerical simulation problems actual project research based FSI. And it provides theoretical guidance optimization design...

According to the real structure and work condition of a large-scale gas control valve used in recycling generating electricity project, modal analysis modeling fluid-structure interaction system is set up vibration studied. The fluid force on plug when at different openings analyzed. computing environment, frequencies are obtained. influence frequency showed, which relate plug. change coupling uncoupling investigated. All these favor characteristic analysis, fault diagnosis realizing design...

The control valve exists the vibration and response lag of implementing agency in practical work, problem can be separately solved by friction compensation which bases on dither effect. In this paper, issues are together using Extended Turned Mass Damper (ETMD), ETMD damping systems not only vibration, but also generate effect to compensation. mechanism is analyzed. effectiveness simulated analyzed at same time. results show that system may realize antivibration cause for compensation, remarkable.

Redundant actuation has good performance in eliminating singularities and optimizing force distribution, a 2-DOF redundantly actuated parallel robot is taken as the object of study. The dynamic model derived. Because an uncertain nonlinear system, sliding mode variable structure controller designed considering its fast response robustness. Then stability proposed analyzed. saturation function used instead sign to eliminate chattering control. simulation results show that torque each servo...

Establish interior flow field model of the control valves under blocking fault, using CFD simulation and analysis internal valve trouble-free. The research indicates that changes fluid state motion, causes vortex in core, resulting energy loss reduces performance.

Whether an electro-hydraulic control valve for the mixed-gas pressure in a combined cycle power plant (CCPP) of steel mill meets challenge gas turbine depends on its dynamic response. To obtain characteristics before it is manufactured, design approach based physical simulation model presented. The actuator redesigned according to proposed approach. results show that intercoupling effect flow fluctuations and pulsations can result velocity oscillation actuator. By using proper accumulator...

Control valves are generally present whenever fluid flow regulation is required. The control valve reliability critical to the quality and safety of a plant. An improved dynamic static behaviour would have major impact on process output. In order assess performance valve, computer model an electro-hydraulic developed. And characteristics investigated through use mathematical simulations performance. results show that driven which developed regulate mixed-gas pressure in combined cycle power...

A purely torsional dynamic model of closed-form planetary gear set is developed to investigate its natural frequency and free vibration modes. The considered consists two-stage connected by high-speed carrier ring gear. Three identical planet gears are equally spaced in each stage. Based on the precondition, modes classified into three types modes: overall modes，high-speed mode low-speed

Word embedding models treat words with equal status, which leads to the neglect of hierarchical semantic relationships between (e.g., ‘green’ – ‘color’ and ‘cat’ ‘mammal’). To build a structure from raw text data, we propose an unsupervised model learn word representations (WHR), are extended representations. Globally, WHRs can describe several other representing basic attributes. The WHR is continuous bag-of-words (CBOW) neural language perceptual grouping attention mechanisms. We further...

The monitoring of machine sensor data was great significance in modern semiconductor wafer manufacturing. These process were used for early detection anomalies, facilitating later adjustments and avoiding further economic loss. In this paper, a deep variational auto encoder neural network model proposed to improve the accuracy anomaly detection, reduce manual intervention adapt differences between processes machines, at last eliminate cause faults thus abnormal yield Dynamic time wrapping...

The flow coupled secondary hydraulic lifting system of the excavator bucket was presented, also its structure, working principle, and performances. math model is established, using mode to control accumulator, then realize process controlling energy recycling reusing. Further, pressure range expanded, reusing effect efficiency were improved.

In the research of flow field about a control valve in method CFD (Compute Fluid Dynamics), process 3-D molding is difficult for some reasons, complex interior structure valve, requirement aimed to be different opening, etc. We obtain accomplish modeling automatically and rapidly this paper by Cavity Command, Component Configurations Driven Dimension. It verified that valid mesh experiment.

A solution to the problem of elimination chattering effect and improving convergence speed for sliding mode control is presented in this paper.A new dynamical controller developed which takes first derivative signal instead actual as results smoothed inputs given system.A nonlinear surface devised can improve phase.Exponential reaching law taken determine phase.A mobile manipulator with two arms an example track a trajectory proposed controller. It found that method has high also reduced greatly.