Papers by Author: Wen Yuan

Abstract: On the premise of data pre-processing by principal component analysis, in this paper, the largest Lyapunov exponent and generalized correlation dimension of multivariate time series are extracted based on the multivariate reconstruction presented. Though simulation analysis of coupling Rossler system, The results indicated that the method can identified and diagnosis fault accurately for complex system dynamics. The method has been used to fault character extraction for diesel engine with satisfactory results.

Abstract: Extract correlation dimension of vibration signal of reciprocating compressor based on G-P algorithm and empirical mode decomposition（EMD）technology, with found mode of EMD de-noise, with the incorporation of method of self-interrelated function and method of pseudo-phase portrait ensure delay-time and calculate embedding dimension by EMD method. Through simulation analysis of Lorenz system, Apply the method to identify valve faults of reciprocating compressor, the result indicate that the modeling method is effective.

Abstract: With heat flux increasing and cooling space decreasing in microelectronic and chemical products, micro heat pipe has become an ideal heat dissipation device in high heat-flux products. Through the analysis of its working principle, the factors that affect its heat transfer limits and the patterns in which copper powders are arrayed in circular cavity, this paper first established a mathematical model for the crucial factors in affecting heat transfer limits in a circular micro heat pipe with a sintered wick, i.e. a theoretical model for capillary limit, and then verified its validity through experimental investigations. The study lays a powerful theoretical foundation for designing and manufacturing circular micro heat pipes with sintered wicks.