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This paper focus on the design and active vibration control problem of flexure jointed stewart platform with non-cubic configuration. A general stewart platform is developed with non-cubic configuration using flexure mounts for all joints and magnetostrictive actuators as active elements, which leads to strong coupled motions along different axes. Adaptive filter algorithms for active vibration control...
Giant magnetostrictive actuator (GMA) has been used in precise position, active vibration control with characteristics of large output force and displacement. Hysteresis nonlinearity is main drawback of GMA, which causes undesirable inaccuracies, oscillations, even instability to systems and restricts its potential application. Specially, stress-dependent hysteresis is encountered in GMA, which means...
This paper introduces a conceptual framework for the process underlying emotional responses that result from the perception of products. The framework distinguishes different kinds of product affection on the basis of emotional psychology. Accordingly, the product affection is divided into three levels: the reflection emotional level, the basic emotional level, the emotional senior level. By revealing...
A deterministic ecosystem model is combined with an extended Kalman filter (EKF) to produce short term forecasts of algal bloom and dissolved oxygen dynamics in a marine fish culture zone (FCZ). The weakly flushed FCZ is modelled as a well-mixed system; the tidal exchange with the outer bay is lumped into a flushing rate that is numerically determined from a three-dimensional hydrodynamic model. The...
We investigated the presence and fate of 16 antibiotics belonging to seven groups (β-lactams, fluoroquinolones, macrolides, sulfonamides, tetracyclines, trimethoprim and amphenicols) in effluents of sewage plants and receiving waters in Hong Kong. Cefalexin, amoxicillin, ofloxacin and erythromycin–H 2 O were ubiquitous in sea water throughout Victoria Harbour, indicating continuous discharge...
Effective employment of giant magnetostrictive actuator (GMA) is limited in trajectory-tracking applications due to hysteresis nonlinearity, especially it is stress-dependent. In this paper, the properties of stress-dependent hysteresis for GMA are studied and a stress-dependent hysteresis model is given by extending modified Prandtl-Ishlinskii model to describe hysteresis effects. The identification...
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