Applied Mechanics and Materials Vols. 220-223

Abstract: With the development of wind power technology in recent years, wind power technology has made rapid development. In this paper, the wind farm is the main object of study, the energy storage elements is vanadium redox flow battery (VRB), the use of decoupling control of fuzzy PID control algorithm for real-time changes in PID parameters of the active and reactive power. The outer loop of motor side rectifier is power loop, the inner is current loop. The outer loop of grid side inverter is the voltage loop, the inner is current loop, and based on vector control, the rectifier and inverter achieve decoupling process.The traditional PID is poor in anti-interference ability and robustness,so this paper uses the fuzzy PID control algorithm. The MATLAB/simulation results show that the fuzzy control algorithm can achieve power tracking control,and has strong robustness.

Abstract: In measuring field, leaning sensing devices is an important measuring element in engineering project and lab testing which changes leaning signal to electrical one for detecting leaning attitude. This paper presents one kind of leaning sensing device based kerosene ferrofluid. The detecting principle is deduced and an experiment set up for verifying the deducing conclusion. Both deducing formula and experimental results show that the output voltage signal of leaning sensing system is linearity with leaning angle. The output signal is increased with the increment of leaning angle. And the sensitivity of this detecting system is increased with the increasing of input frequency. The experimental results are well conformity with the principle deducing.

Abstract: In this paper, visualization detection technology of supercharged boiler’s combustion in furnace is been used to take photo of the flame in furnace, and calculate temperature images and radiant rate images corresponding to flame images, and get average temperature and average radiant rate value, and gain relationship between average temperature and average radiant rate value. Studies show that: according to image of flame in furnace taken in different working conditions, average temperature and average radiant rate value have the same change rule. Working condition of boiler is higher, fuel consumption and radiant temperature are higher, and average radiant rate is lower, and operation parameters such as fuel press, steam temperature and pressure difference of gas are higher, and vice versa.

Abstract: In order to achieve stable control of temperature in the process control, a system based on LabVIEW platform has been designed which can switch between fuzzy controller and PID controller, with the advantages and disadvantages of PID and fuzzy algorithm taken into account. In this paper, the PID parameter self-setting principle which is based on ASTROM limit cycle of law is also employed. The experiment results show that, the proposed method which combines fuzzy algorithm and PID control method, implemented by flexible online programming based on LabVIEW, can achieve high precision and strong robustness in the industrial applications.

Abstract: To ensure development work breakdown comprehensive and thorough for large aircraft product, this paper put forward a WBS decomposition technique based on artificial neural network. On the basis of analysis of the neural network model and work breakdown structure (WBS), project control work breakdown structure (PCWBS), functional work breakdown structure (FWBS), relational work breakdown structure (RWBS), I set up a model which could get PCWBS, FWBS, RWBS and then get WBS according to the knowledge of the similar aircraft development WBS decomposition, so as to realize the automatic acquisition of WBS by input the general project attribute, which replaced the traditional state of depends on the personnel’s experience, and improve efficiency. Based on this, a prototype system is developed, and has been validated by a large aircraft WBS’s generation.

Abstract: This paper sets up high energy regenerative braking and driving integrated system for electric vehicle and its dynamic model based on the wheel hub motor and friction brake integrated into electric vehicle braking system. Bend EBD hierarchical strategy of control is put forward, which is based on ABS system. Establish dynamic simulation system of electric vehicle integrated brake system and EBD control simulation system based on the Matlab /Simulink. Based on CheryA3 model car, the wheel hub motor drive system replaces the power system; carry out simulation and analyze the control performance of the integrated braking system during cornering braking. The results show that the bend EBD control performance of high energy regenerative braking/driving integrated system for electric vehicle is good, which has a high braking energy recovery rate, braking efficiency and braking stability.

Abstract: Abstract: By adopting CFD numerical simulation software, the transient state numerical simulation of engine is carried on. The intake and compression stroke are studied in maximum power and maximum torque conditions. Through numerical simulation, we can learn the change of TKE with the crank angle, and give a guide for improving design of intake port and chamber. At last, a conclusion is found about the engine that at high speed, the gas flow in cylinder infects the stability of spark ignition.

Abstract: Combustion intermediate products in nitrogen-enriched intake air (NEA), such as CH2O and H₂O₂, are researched in this paper with chemical reaction kinetics software. Besides that, combustion of n-Heptane in NEA at different intake temperature and different rotate speed are researched. Nitrogen-enriched air combustion process in diesel engine is simulated with CAE software. The temperature trace peak and NO_x emission at NEA and different rotate speed are studied in this paper. The increment of nitrogen in the intake air greatly impacts on the n-Heptane combustion intermediate products CH2O and H₂O₂; and the results show that the nitrogen is of fire-retardant properties. The peak-cylinder combustion pressure and the relative pressure-increase rate will decrease with the increment of nitrogen in intake air when the temperature is higher than certain value. NO_x emissions decrease with the increment of nitrogen in intake air.

Abstract: Proposed wheeled off-road excavator with 2-Dof articulated body, and analyzed the working principle of the 2-Dof articulated body, machine-hydraulic drive system and the key technologies .Through the study of the vehicle drive system matching calculation and the ADAMS simulation of articulated body, the results show that the articulated truck has good passing ability, stability and adaptability on a complex road.

Abstract: A coupled dynamic analysis method is introduced for numerical simulation of floating wind turbine systems in this paper. A numerical code，which has been developed to perform couple hydrodynamic analysis of floating body together with its mooring system, is extended to collaborate with wind turbine simulator to evaluate the interactions between wind turbine and its floating base. To verify the coupled method, a dynamic response analysis of a spar type floating wind turbine system (NREL offshore-5MW baseline wind turbine) is carried out separately by the coupled Morison method and radiation-diffraction theory. Numerical results and comparison are presented. It turns out that this coupled method is competent enough to predict hydrodynamic performance of floating wind turbine system. The numerical results derived in this study may provide crucial information for the design of a floating wind turbine in the near future.