The tests date to characterize the rubber material constants as well as the hyperelastic material stability is discussed. The rubber material of engine mount is analyzed based on different forms of strain energy poten...
详细信息
The tests date to characterize the rubber material constants as well as the hyperelastic material stability is discussed. The rubber material of engine mount is analyzed based on different forms of strain energy potentials using finite element analysis software ABAQUS. The method of using test data to calibrate material coefficients is obtained. Both of the hyperelastic constitutive law and the viscoelasticity constitutive law of rubber material are used in the dynamic analysis. The simulation of the rubber mount static and dynamic characteristic agrees well with experimental results.
Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the ground...
详细信息
Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/¿-connection transformer is suitable for small resistance grounding distribution networks while ¿ /Yg and ¿ / ¿ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according t...
详细信息
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is simulated. Then, based on the data gained from experiment, a model of small wind turbine is presented using system identification. The main content of the model is the performance coefficient Cp derived from experimental data. A comparison is made on the simulation results of the model and the data measured. With simulation results of the two methods for modeling wind turbine, by using theoretical analysis and identification respectively, we can see the two models are both effective; only that they should be applied in different conditions.
The gradient variance and spatial stability associated with landscape pattern were investigated for fast urbanization area of Tongzhou District of Beijing by combining spatial network sampling technique, landscape met...
详细信息
The gradient variance and spatial stability associated with landscape pattern were investigated for fast urbanization area of Tongzhou District of Beijing by combining spatial network sampling technique, landscape metrics and gradient analysis. A newly integrated indicator, Landscape Stability Index (LSI) is established by combing related landscape metrics to reflect the potential landscape dynamics. The results shows that landscape change in Tongzhou exhibits distinctive spatial differences along transects from urban center to rural areas, characterized by higher fragmentations at urban fringes and newly urbanizing areas. In addition, the landscape stability index of Tongzhou is from 0.204 to 1, with mean value of 0.4436, indicating relatively low landscape stability level with intensive transformation and conversion of landscape and obvious spatial difference. The rapid landscape converting area (with low LSI value) consists of the arc-shaped area surrounding central Tongzhou city and its vertical zone along Beiyun River to southeastern direction.
In this paper, fault mechanism of icing of wind turbine blades is studied theoretically and experimentally. First, the aerodynamic performance of a wind turbine's primary airfoil under normal and icing conditions ...
详细信息
In this paper, fault mechanism of icing of wind turbine blades is studied theoretically and experimentally. First, the aerodynamic performance of a wind turbine's primary airfoil under normal and icing conditions are simulated using Fluent software separately to analyze the geometry effect of icing on wind turbine. Then the formation and characteristics of vibration signal on main shaft caused by mass unbalance of wind turbine's rotor are analyzed using rotor dynamics theory to evaluate mass effect of icing on wind turbine. Finally, corresponding experiments are carried out on a self-made small wind turbine under laboratory conditions to testify the former theoretical analysis.
As a clean, renewable, widely distributed, non-polluting energy, wind power plays an important role in the world's renewable energy development. In order to ensure the stable operation of wind turbines using non-g...
详细信息
As a clean, renewable, widely distributed, non-polluting energy, wind power plays an important role in the world's renewable energy development. In order to ensure the stable operation of wind turbines using non-grid-connected wind power, as well as the efficient utilization of wind resources, a study of condition monitoring of wind turbines is necessary. A test system of wind turbines under laboratory conditions based on a LabView platform has been designed and the system has been applied on small wind turbine test bed to test the performance of output power and vibration characteristics. The result of simulation testing has verified the effectiveness of the test system.
This paper introduces the differential-braking algorithm to control the stability of tractor semi-trailer. First, it analyses the theory of differential-braking control and confirm the control strategy that follows th...
详细信息
This paper introduces the differential-braking algorithm to control the stability of tractor semi-trailer. First, it analyses the theory of differential-braking control and confirm the control strategy that follows the ideal yaw rate of 2-DOF model. From this point of view, a PID controller has been designed. The result of the co-simulation associated with MATLAB and ADAMS shows that the differential-braking algorithm is adequately effective in the stability control for the tractor semi-trailer.
Reclamation and reuse of sewage is considered as an effective and economical measure to solve the water resource ***,the potential environmental risk caused by micropollutants in the sewage is increasingly of *** this...
详细信息
Reclamation and reuse of sewage is considered as an effective and economical measure to solve the water resource ***,the potential environmental risk caused by micropollutants in the sewage is increasingly of *** this paper,the removal characteristics of synthetic polycyclic musks in a full scale membrane bioreactor combined with anaerobic-anoxic-oxic (A2/O-MBR) process for treatment of municipal wastewater was *** synthetic polycyclic musks,composed of Tonalide (AHTN) and Galaxolide (HHCB),in every step of A2/O-MBR process,were simultaneously analyzed by gas chromatography/mass spectrometry after derivatisation.
Based on the theory of vehicle system dynamics and applying the simulation software TruckSim, the characteristic parameters model and the corresponding aerodynamic coefficients curve model of a certain Chinese-made tr...
详细信息
Based on the theory of vehicle system dynamics and applying the simulation software TruckSim, the characteristic parameters model and the corresponding aerodynamic coefficients curve model of a certain Chinese-made truck are established. The process of crosswind effecting on the truck running in a straight-line is simulated, and the aerodynamic characteristic curve under the conditions of open-loop is obtained. Using the software TruckSim, the driver model is imported. Changing the parameters such as the wind speed, the wind heading and the speed of truck, it is analyzed the influence of crosswind effecting on handling and stability of truck which is driven in a straight-line.
暂无评论