Ruizhen Gao

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The optimal design of vehicle suspensions is a complex design optimization problem which may have highly nonlinear design spaces with many local optima. At present, there are two main problems for the optimal design of vehicle suspensions. The first is that the global optimization solution is hardly reached using the numerical methods or the simple genetic(More)
This paper introduces triangulation theory into genetic algorithm and with which, the optimization problem will be translated into a fixed point problem. An improved genetic algorithm is proposed by virtue of the concept of relative coordinates genetic coding, designs corresponding crossover and mutation operator. Through genetic algorithms to overcome the(More)
Considerable attentions have been devoted recently to active vibration control using intelligent materials as sensors/actuators. This paper presents results on active control schemes for vibration suppression of flexible cantilever beam with bonded piezoelectric sensors and actuators. State equations which the generalized modal coordinates as variables are(More)
Rice and maize dwarf diseases caused by the newly introduced Southern rice black-streaked dwarf virus (SRBSDV) have led to severe economic losses in South China in recent years. The distribution and diversity of SRBSDV have not been investigated in the main rice and maize growing areas in China. In this study, the distribution of SRBSDV in China was(More)
For multi-objective optimization problems, an improved multi-objective adaptive niche genetic algorithm based on Pareto Front is proposed in this paper. In this Algorithm, the rank value and the niche value are introduced to evaluate the individuals. The evolution population adopts the adaptive-crossover and adaptive-mutation probability, which can adjust(More)
The stator radial vibration caused by the radial force is the main origin of vibration and acoustic noise in switched reluctance motors. Obtaining non-linear relations of the radial force with the phase current and the rotor position and the radial force waveforms are very important for the nonlinear vibration study. In this paper, non-linear static radial(More)
The torque ripple is a major problem of switched reluctance motor drive system, which can cause undesirable acoustic noise and vibration. A novel method of torque closed-loop and fuzzy compensation control for the switched reluctance motor drive system based on finite element model is described in this paper. Under a switched reluctance motor drive system(More)
In the study of active vibration of piezoelectric smart structures, the piezoelectric materials always show nonlinear characteristic, so this paper uses the fuzzy logic to control the smart structures vibration. The fuzzy IF-THEN rules are established on analysis of the motion traits of cantilever beam. The fuzzy logic controller (FLC) designs on using the(More)
—Torque ripple is a major problem of switched reluctance motor drive system, which causes undesirable vibration and acoustic noise. In this paper, a novel method of torque closed-loop and fuzzy compensation control for the switched reluctance motor drive system based on finite element model is described. In terms of the simulation results and the special(More)
The mathematic model of a two-bar truss is built in MATLAB and the analysis is carried out by the genetic algorithm toolbox. In order to compare with each other, the parametric model of the planar truss is also established by the ANSYS Parametric Design Language and solutions are obtained using the first-order method native to ANSYS. The comparison of the(More)