Research on Permanent Magnet Constant Voltage Device for Vehicle
Firstly, the improved quadratic regression orthogonal design method is proposed. Secondly, the indoor physical experiment is carried out on the main affecting factors for the permanent magnet constant voltage device for vehicle application, and meanwhile, the corresponding output voltage and current mathematical model is established by means of the statistical analysis, mathematical model establishment. Finally, the influence mechanism of the different speed and frequency on the output voltage and current is analyzed. This research can provide an important basis for study of the permanent magnet constant voltage device.
Operating control of efficiently generating induction motor for driving hybrid electric vehicle
In this paper, the principle of induction motor for driving hybrid electric vehicle (HEV) is analyzed when running in state of generator. Based on the induction motor's equivalent circuit, it is concluded both the slip range when feeding back to storage battery and the optimum slip at peak generating efficiency. The generator can operate at peak efficiency in terms of the optimum slip controlling excitation current and frequency of induction motor. An optimum slip vector control system of induction motor for driving HEV is designed. The experimental results are satisfactory. Analyzing and testing in this paper will provide theoretic and experimental support for optimum control of HEV.
Compressive and flexural properties of hemp fiber reinforced concrete
The compressive and flexural properties of hemp fiber reinforced concretes (FRC) were examined in this paper. Natural hemp fiber was mixed using dry and wet mixing methods to fabricate the FRC. Mechanical properties of the FRC were investigated. The main factors affecting compressive and flexural properties of the FRC materials were evaluated with an orthogonal test design. Fiber content by weight has the largest effect. The method for casting hemp FRC has been optimised. Under the optimum conditions, compressive strength increased by 4 %, flexural strength increased by 9 %, flexural toughness increased by 144 %, and flexural toughness index increased by 214 %.