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Lin H.,Chongqing Industry Polytechnic College
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

True stress-strain data of 3Cr20Ni10W2 alloy at elevated temperatures were obtained through isothermal compression experiment. By the diverse linear regression for hyperbolic sine equation in Arrhenius type, deformation activation energy Q, materials constants n, α and A under different deforming conditions were calculated. And then the constitutive equation of the 3Cr20Ni10W2 alloy for description of the relationships among flow stress, strain, strain rate and temperature were constructed. The results show that the flow stress predicated by the proposed model agrees well with the experimental results, and the maximum relative tolerance is only 7.45% and correlation coefficient is 0.995. Source


He Y.,Chongqing University | Liu F.,Chongqing University | Wu T.,University of Wisconsin - Madison | Zhong F.-P.,Chongqing Industry Polytechnic College | Peng B.,Chongqing University
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | Year: 2012

Understanding and estimating the energy consumed by machining are essential tasks as the energy consumption during machining is responsible for a substantial part of the environmental burden in manufacturing industry. Facing the problem, the present paper aims to analyse the correlation between numerical control (NC) codes and energy-consuming components of machine tools, and to propose a practical method for estimating the energy consumption of NC machining. Each energy-consuming component is respectively estimated by considering its power characteristics and the parameters extracted from the NC codes, and then the procedure estimating energy consumption is developed by accounting for the total energy consumption of the components via the NC program. The developed method is verified by comparing the estimated energy consumption with the actual measurement results of machining two test workpieces on two different machine tools, an NC milling machine and an NC lathe, and is also applied to evaluate the energy consumption of two different NC programs on the NC milling machine. The results obtained show that the method is efficient and practical, and can help process planning designers make robust decisions in choosing an effective energy-efficient NC program. © IMechE 2012. Source


Li K.,Chongqing Industry Polytechnic College
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

the pedal is one of the most important parts assuring the safety and comfort of automotive. This paper adopts FEM (Finite Element Method) analysis the brake pedal assembly according to the industry standard. In order to obtain the strength of the brake pedal and on the base of the strength result of FEM the fatigue analysis is carried out to verify the strength whether meet the industry standard. At last, some experiments are conducted on the product designed by this method and the experimental results show that no fatigue failure happens. © 2011 IEEE. Source


Shen Y.,Chongqing Industry Polytechnic College
Energy | Year: 2014

Accurate prediction of cell SOC (state of charge) is important for the safety and functional capabilities of the battery energy storage application system. This paper presents a hybrid UPF (unscented particle filter) based SOC determination combined model for batteries. To simulate the entire dynamic electrical characteristics of batteries, a novel combined state space model, which takes current as a control input and let SOC and two constructed parameters as state variables, is advanced to represent cell behavior. Besides that, an improved UPF method is used to evaluate cell SOC. Taking lead-acid batteries for example, we apply the established model for test. Results show that the evolved combined state space cell model simulates battery dynamics robustly with high accuracy and the prediction value based on the improved UPF method converges to the real SOC very quickly within the error of±2%. © 2014 Elsevier Ltd. Source


Yi L.,Chongqing Industry Polytechnic College
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015

The development of science technology and productivity makes great changes in the electronic manufacturing industry structure. Corresponding mathematical model of electronic manufacturing industry supply chain is proposed, which can make total cost of enterprise minimum. Finally, we prove the feasibility of supply chain by an example about M enterprise. © 2015 IEEE. Source

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