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The Piezoelectric Actuator Drive (PAD) is a type of rotary motor that transforms the linear motion of piezoelectric stack actuators into a precise rotational motion. The very high stiffness of the actuators employed make this type of motor suited for open-loop control, but the inherent hysteresis exhibited by piezoelectric ceramics causes losses. Therefore, this paper presents a straightforward method...
Starting from the classical dynamic model of interior permanent magnet synchronous machines (IPMSMs) expressed in the stationary reference frame, this paper presents a mathematical model reconstruction process for IPMSMs, from which an extended flux-based IPMSM model is derived. Compared with the commonly used extended electromotive force-based model, the extended flux-based model has notable advantages...
Lunar ascent guidance is one of the key points for future lunar sample return and manned missions. This paper discusses the practicability of using iterative guidance mode for lunar ascent. The lunar ascent in this paper begins with a vertical rise followed by a single axis rotation and then a guided phase. The three-dimensional equations of motion for lunar ascent are derived over a flat moon with...
This paper proposes an adaptive interconnection and damping assignment (IDA) passivity-based controller (PBC) with a complementary proportional integral (PI) controller for DC-DC boost converters with constant power loads (CPLs). Instead of deriving parameters of the IDA-PBC from computer simulations, a virtual circuit is introduced for determining the parameters of the IDA-PBC to make the system...
Semantic-based query expansion is one of the hottest researches in the field of current information retrieval, but it still lacks a better recognized solution. The traditional vector space model succeed in solving the problem of relevance-match between two documents, but it ignores the semantics relevance between the basic language units which constitute the vector. This paper proposes an improved...
An input and output ripple free Step-down converter is proposed in this paper. The two phase interleaved converter has only one inductor with four coupled windings, which decreases both the input and output ripple dramatically. Based on the analyses, the coupled inductor can also improve the transient response performance, and reduce the size and weight of the converter. Detailed analyses and simulations...
Recently, Liu et al. (Liu YC, Wen HA, Lin CL, Hwang T. Proxy-protected signature secure against the undelegated proxy signature attack. Computers and Electrical Engineering 2007; 33: 177-85) proposed one proxy signature scheme that is the improvement of Zhou et al.'s (Zhou Y, Cao Z, Lu R. Provably secure proxy-protected signature schemes based on factoring. Appl Math Comput2005; 164(1):83-98) proxy...
In current market competition companies face with short product life cycle, high demand uncertainty and drastic declines of product values. This study analyses the price protection policy in channel coordination and proposes a two-period dynamic model of optimal price protection rate based on the single ordering. The result shows that, through setting reasonable the wholesale price and the price protection...
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