Advanced Materials Research Vol. 823

Abstract: Pattern noise is mainly one of tire noise types, which is generated by impacting of tires block on the road. Generally, traditional Fourier Transform is used to process noise signals. However, the pattern noise is a kind of non-stationary signal and is related to pitch arrangement of a block, FFT is unsuitable. This paper proposes wavelet transform to analyze tire noise signals at different speeds. The causes of the frequency components of tire noise are interpreted. The results show that using wavelet transform method can effectively and intuitively analyze tire tread noise.

Abstract: With respect to serious water waste and backward cleaning devices relevant to the cleaning of road greenbelts, this paper describes an independently-designed water-saving greenbelt cleaning device with performance of energy saving and emission reduction. After the device is developed, relevant cleaning experiments are conducted on the gardening vehicles. The results show that the new water-saving greenbelt cleaning device can improve the efficiency of water utilization significantly.

Abstract: Based on the advantages of independent component analysis (ICA) and cepstrum, this paper adopts a novel feature extraction scheme for rolling bearing fault diagnosis utilizing improved independent component analysis and cepstrum analysis. Firstly, the fast fixed-point algorithm (FastICA) based on negative entropy was used here as the ICA approach to separate the mixed observation signals of rolling bearing vibration. Then, the largest spectral kurtosis value was used to confirm the characteristic separated signal associated with the Rolling bearing faults. Finally, cepstrum analysis was employed to deal with the selected signal to extract the original fault feature. The experimental results show that sensitive fault feature can be extracted prominently after the presented processing, and the proposed diagnostic method is effective for the fault diagnosis of rolling bearing. In addition, the proposed method provides an effective technical means for weak fault diagnosis.

Abstract: This paper focuses on the trajectory tracking problem of mobile robots with system uncertainties and disturbances. With the integration of a kinematic controller and a dynamic controller, a hybrid control method is presented. Firstly, an adaptive kinematic controller is proposed through the kinematic model and backstepping method. Secondly, a neural network dynamic controller is proposed, with the consideration of system uncertainties and disturbances. The stability of the proposed control scheme is verified via the Lyapunov method and Barbalat lemma. Finally, results of circular trajectory simulation have illustrated the effectiveness of the present control scheme.

Abstract: The crankshaft composite follow crankshaft turning lathes use the following tool system to complete the turning of crankshaft, when crankshaft machining is working, the turret mechanisms processing error and assembly errors will affect the crankshafts processing quality, So it is difficult to control the actual machining accuracy, or it may cause the waste of material. Therefore, in this paper, by analyzing the impact of the rod length errors on the trajectory of the tool tip, the tool tip trajectorys equations can be built. Using MATLAB tools, we can build the tip point trajectory modeling and solve the deviation between the actual tip point and the ideal trajectory, and finally can get the result of rod lengths error on the accuracy of the actual processing, which will provide basis for the design and analysis in future.

Abstract: Continuous and universal in-situ remediation appliance of soil combines taking soil, transmission and restoration of soil, which can achieve the in-situ remediation continuously and avoid the drawback of massive labor power and material resources using domestic soil ex-situ remediation device. The appliance supports many kinds of soil remediation technology, realizing the function of universal technology. And as for the area with serious pollution, various technology combinations can be selected to extend its function. The motion of specific remediation device in the appliance utilizes the single-chip controlling technology, controlling the remediation time interval of different technology. The program selection with various remediation technologies can be finished with buttons. Single-chip controlling system responds quickly, runs stably and precisely controls the remediation device.

Abstract: After analytical studies of the characteristics of various slurry and supported photocatalytic reactors, a photocatalytic reactor with photocatalyst film loaded on substrate is designed in this paper. This reactor is characterized by the easy attachment and convenient installation & replacement of photocatalyst, higher light utilization, and complete photocatalytic reaction.

Abstract: The objective of this paper is to implement the optimal design of a high-speed press with a new transmission mechanism for punching. Firstly, the novel mechanism is shown and its merits are discussed. Then kinematic analysis is carried out by using the vector loop method. Additionally, the kinematic dimensions of the mechanism are derived by using a GA-DE algorithm. Finally, a comparative study for kinematics is made between original and optimized dimensions. The results indicate that proposed novel mechanism with optimized kinematic dimensions is of better output motion for high-speed punching.

Abstract: In this paper, the dynamics of nonlinear hybrid vibration isolation system is carried out for a qualitative analysis, based on the algorithm of synovial variable structure the control model of hybrid vibration isolation system is designed, and then the validity of the control model is verified by relevant examples in the condition of nonlinear stiffness. Moreover, the simulation results show that: the control performance of nonlinear hybrid vibration isolation is better than passive vibration isolation and linear vibration isolation system, and the introduction of nonlinear stiffness can effectively reduce the force transmited to foundation. The control methods studied in this paper has an important guiding significance to design the nonlinear hybrid vibration isolation system in the practical engineering.

Abstract: In this paper, the temperature characteristics of Micro Inertial Measurement Unit (MIMU) were studied for improving its stability. The temperature error model was built on the basis of analyzing its temperature characteristics. The model combined zero bias and calibration factors for MEMS accelerometers and gyros with multiple variables and it was optimized by the stepwise regression method. Meanwhile, combined with Kalman filtering theory, using Kalman filtering to reduce the noise of the temperature measurement could further improve the compensation accuracy and measurement accuracy.