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In the foot trajectory planning of quadruped robot with active variable stiffness of flexible joint, the existence of the flexible joints makes quadruped robot legs oscillate in swing phase. In this case, this paper proposes a joint stiffness coefficient adjustment strategy and a new foot trajectory generation method. Simulation experiments show that this method can effectively reduce the volatility...
In this paper, a cost-effective regenerative braking system for Electric Vehicles (EV) driven by induction machine (IM) is proposed. The structure of the system is simple because the extra demands are only the capacitor bank and resistor bank. A five- phase IM is chosen in this paper to adapt the high- power trend of EV and lower the device size. The required reactive power for the braking system...
Fixed-point simulation is extremely important in the design of fixed-point FPGAs. Float-point simulation is used to verify the arithmetic, while the fixed-point simulation is adopted to evaluate performance and verify the implementation. The design of high-precision system by FPGAs must focus on the fixed-point simulation to reduce the error acceptable even to zero. Based on the analysis of fixed-point...
Computational fluid dynamics (CFD) is a numerical method for modeling hemodynamics, which has been applied to the study of internal carotid artery aneurysm. And the lattice Boltzmann model has received considerable interest as an efficient method of computing a variety of fluid flows, especially with complex geometrical configurations. Therefore, 3-dimensional mathematical model of interal carotid...
In this paper, we present a spatial version of the Holling-type II predation-diffusion model which contains some important factors, constant harvest rate on prey, noise on predator. From the numerical results, we know that noise can induce instability and enhance the oscillation of the species density. Our results show that the noise and harvest play a prominent role in the predation-diffusion model.
CBGA (ceramic ball grid array) is one kind of advanced package for FPGA, which can fulfill the demands of high interconnect density, high thermal and electronic performance, high chip-assembling yields, high reliability. But in multiple loading environments, CBGA has the invalidation mode of solder joint thermal-mechanical failure, which will influence the long term reliability of FPGA circuits. But...
A fast edge detection method basing on the combination of fuzzy subsets is developed, while the detection of an edge as a classification problem will be considered, partitioning the image into two portions: the edge portion and the non-edge portion. The latter one, as the main constituent of an image, consists of the object and its background. Removing the non-edge portion from an image, the remainder...
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