Advanced Materials Research Vols. 211-212

Abstract: China is still in the preliminary stage of applying the constructed wetland technology to the designing of urban landscape. This paper focuses on the research of the technology's application in the urban landscape design in Chinese cities and the detailed process flow, and gives the readers a brief introduction to the background of the technology and relevant research development in foreign counties. Through the analysis of different cases this paper indicates the multiple benefits constructed wetland technology can bring to urban landscape designs.

Abstract: The "low-carbon" concept has won support from many countries once it was raised. Based on the study of the low-carbon urban communities, this paper gives an introduction to the current problems in designing living environment in China, as well as the design principles of people's living environment in ecological, economical, cultural and artistic aspects. By giving examples and analysis on design examples home and abroad, this paper also elaborates on the future development of the design of people's living environment.

Abstract: In this paper, Radial Electromagnetic Force Wave, which causes the magnetic noise of the permanent magnet synchronous motor used in the electric vehicles of the Shanghai Expo, is studied by programming with ANSYS Parametric Design Language (APDL). The magnetic properties such as magnetic induction, magnetic field, magnetic flux density between the stator and the rotor are researched at no load and three-phase voltage load. Then all of the data is combined with Maxwell’s equations to calculate the space distribution and time distribution of radial electromagnetic force wave. Finally, it is made a main conclusion that main frequencies of radial electromagnetic force wave at the 3-phase voltage load are 200*k Hz (k=1, 2, 3…) and the corresponding levels are 3*k (k=1, 2, 3…).What’s more, it is also concluded that the radial electromagnetic force wave gain at Level 9 and 600 Hz reaches the peak.

Abstract: An adaptive neural network control scheme is presented for a class of SISO affine nonlinear systems. Parameters in neural networks are updated using a gradient descent method. No robustifying control term is used in controller. The convergence of adaptive parameters and tracking error and the boundedness of all states in the corresponding closed-loop system are demonstrated by Lyapunov stability theorem. Simulation results demonstrate the effectiveness of the approach.

Abstract: According to the requirement of car seat performances, an automatic inspection system of car seat performances based on virtual instruments is developed and put into real production. The paper introduces the hardware configuration, module functions, implementation and application of the system. The system has high accuracy, reliability and stability with multi functions.

Abstract: Hub nodes of urban traffic complex network are very important for region traffic signal control. Traditionally, region traffic signal control system like SCOOT/SCATS use traffic flow, vehicle queue and distance between junctions as reference in sub-control-area selection practice, in which process engineers’ experience should play importance roles. In this paper, node degree, node betweeness and high peak hour traffic flow are selected as indexes for traffic network node importance assessment. Moreover, C-Means clustering is applied to analysis which junction could be act as a hub node for regional traffic control. To test the effectiveness of this method, urban network around Chang’an Street in Beijing including almost fifty nodes, China is used as trail field. Data result shows Changchunjie, FuyoujieNankou and Hepingmen junction have high clustering characteristics when clustering number are 3, 4 and 5. And the clustering center shows very similar prosperities with real hub node in practice. In conclusion, the multi-index and clustering analysis could provide theoretical support for urban traffic complex network hub node assessment.

Abstract: The loss of the population diversity leads to the premature convergence in existing particle swarm optimization(PSO) algorithm. In order to solve this problem, a novel version of PSO algorithm called bacterial PSO(BacPSO), was proposed in this paper. In the new algorithm, the individuals were replaced by bacterial, and a new evolutionary mechanism was designed by the basic law of evolution of bacterial colony. Such evolutionary mechanism also generated a new natural termination criterion. Propagation and death operators were used to keep the population diversity of BacPSO. The simulation results show that BacPSO algorithm not only significantly improves convergence speed ,but also can converge to the global optimum.

Abstract: A practical packaging structure was designed based on the designed MEMS high-g acceleration sensor, and encapsulation performance was simulated when it used potting. By the result of simulation, the packaging structure can meet the requirements that sensor demand, which can test the namal signal under 200,000 g impact load. From the results of modal and static simulation, potting can not only improve the natural frequency of the package model, but also can reduce the stress when shock load effected on the model. Elastic modulus of the potting materials have the great influence on the package performance, but the density has little effect on it. The simulation results also show that the modal frequency of the package model increases with modulus increases, while the the stress reduce when the same load on the package model. However, the modal frequency is much smaller than the packaging structure without potting when the elastic modulus was too small,which may bring a distortion of the sensor output signal.

Abstract: The realization of the handwheel function is a key problem for development of numerical control system of micro milling machine. This paper introduced the interface specifications and hardware connecting methods of handwheel NK100AB2, developed control program based on PMAC (Programmable Multi-Axis Controller) and industrial personal computer, finally achieved the function of axes selecting and the feed rate selecting. Based on the traditional edge detector tool setting method, an improved tool setting method is proposed. The inverted micro milling cutter hilt is used to replace the traditional edge detector, which avoids the opposite reamer error caused by the irregular cutter blade shape, finally, tool setting function is achieved through the collecting of electrical signal. The research will provide a useful reference for the realization of handwheel and tool setting of micro milling machine based on PMAC.

Abstract: The signal analysis is important in extracting fault characteristics in fault diagnosis of machinery. To deal with non-stationary signal, time-frequency analysis techniques are widely used. The experiment data of oil whip vibration fault signal were analyzed by different methods, such as short time Fourier transform (STFT), Wigner-Ville distribution (WVD), Wavelet transform (WT) and Hilbert-Huang Transform (HHT). Compared with these methods, it is demonstrated that the time-frequency resolutions of STFT and WVD were inconsistent, which were easy to cross or make signal lower. WT had distinct time-frequency distribution, but it brought redundant component. HHT time-frequency analysis can detect components of low energy, and displayed true and distinct time-frequency distribution. Therefore, it is a very effective tool to diagnose the faults of rotating machinery.