Papers by Author: Tie Lin Shi

Abstract: A novel selective ensemble of multiple fuzzy ARTMAP (FAM) classifiers based on the correlation measure method and Bayesian belief method is proposed to apply to the fault diagnosis of rolling element bearings in this paper. The test results show that the selective ensemble of four optimal FAM classifiers can identify the different fault categories accurately and has a better classification performance compared to the single FAM and ensemble of all FAM classifiers.

Abstract: Hydraulic drive mixers are widely employed to process the cohesive mixture, especially the energetic mixture. According to the mathematic models of main links of the speed regulating system of a hydraulic drive planetary mixer, a simulation model for the system was presented in this paper. The load and impulsion have impacts on the speed response of the speed regulating system with good performance of stability. The converted rotary inertia of the hydraulic motor has a two-sided impact on the speed regulating system, namely impact the response and the overshoot performance at the same time. And, the leakage of the hydraulic drive system often has a bad impact on the speed response of the regulating system.

Abstract: The performance of speed regulating is very important to the mixing process with safe, efficient operation and high quality of production. Strategies and practices of responses and optimization of a PID-based speed regulating system of a planetary mixer were presented in this paper. Research results show that: by means of the signal constraint function presented by Simulink Response Optimization, optimization PID parameters of the 2-DOF-PID controller can be obtained, and the response of close-loop control system has quite good performance of overshoot, response time, and stability compared with an open-loop control system.

Abstract: The influence of oxidation behavior on super-plastic microforming of bulk metallic glass Zr₆₅Cu_17.5Ni₁₀Al_7.5 in the super-cooled liquid region was investigated. Samples were heated in air from room temperature to 395°C, 410°C, and 430°C, respectively, and kept under each temperature for 40 minutes. The increased weight of samples and the thickness of oxide layer were measured. Subsequently, the sample was compressed under 410°C with a micro gear silicon mold. In result, the oxide layer of the gear cracked and could be easily removed; also, the X-ray diffractometer showed that the gear core below the oxide layer remained an amorphous structure. It can be concluded that the oxidation behavior of Zr₆₅Cu_17.5Ni₁₀Al_7.5 does not affect the super-plastic deformation, which indicates the feasibility of super-plastic microforming process in air.

Abstract: Fluid flow is mathematically expressed as mapping. A dynamic system is strong mixing under certain conditions. The cohesive mixing flow is often in laminar state. By introducing chaos into a laminar mixing system, the mixing performance can be effectively improved. Residence Time Distribution, Lyapunov Exponent, Decay of Correlation, and Mixture Homogeneity are often employed to evaluate the mixing performance of cohesive mixing. New measuring techniques of flow field study, including Particle Tracking Velocimetry, Particle Image Velocimetry, Planar Laser Induced Fluorescence, etc., are quite useful in studying cohesive mixing process. Euler-Lagrange approach and Euler-Euler one are two approaches for modeling and simulation of the cohesive mixing.