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The wireless sensor network (WSN) is one new hot spot for both research and industry. However, the energy problem has been becoming a challenge in practical applications for WSN because the sensor nodes are supplied with energy by batteries which are difficult to be recharged and replaced. So many researches are taken on reducing the energy consumption of WSN nodes. Medium Access Control (MAC) layer...
This paper is focused on the development of an effective method to optimization inversion on constitutive model parameters of bird material in the numerical simulation of bird impact on an aircraft windshield. The experiments of bird impact on a plate under the velocity of 170m/s were performed and the displacements as well as the strains of the plate were measured. The Murnaghan Equation of State...
The phase field method is an effective method on solidification microstructure simulation. In this paper, the basic principles and the phase field model are introduced respectively. And then, the applications of phase-field simulation on solidification microstructure are summarized briefly. Finally, the problems to be faced and the future development trends are pointed out in this area.
By analyzing stress bear and distribution of wall finishing robot guide rails, this thesis puts forward a measuring method based on PSD measurement circuit to measure robot lift rail tilt angle. Meanwhile, wall finishing robot tilt automatic correction servo system is completely designed and simulation analysis is carried out on the servo system and the servo correction results.
HLA (High Level Architecture) has been widely applied distributed interactive simulation field, and RTI (RunTime Infrastructure) is the supporting environment for HLA running and is distributed software system. HLA does not specify its realization. Up to now, there are different RTI release versions with different levels of functions and performances. To ensure selected RTI to satisfy simulation application...
Acording to the theory of fraunhofer diffraction, the silt-diffraction processes is simulated based on labview which has powerful function. First, the change of the single slit-diffraction intensity can be observed when the wavelength of light, slot width and focal length are adjusted. Secondly, the simulation can be used for the process of theoretical teaching beacause the application of the simulation...
We propose a multi-segment approximation method to design a CMOS current-mode hyperbolic tangent sigmoid function with high accuracy and wide input dynamic range. The dynamic range is dependent on the number of segments and the accuracy is related to the dividing point. From mathematical results, we can observe the proposed method outperforms traditional methods. We implement the multi-segment approximation...
This paper researches structure design of dry powder inhalers on clinical use for improvement, based on the theory of ergonomic from the perspective of efficiency, security and flexibility, puts forward a solution and builds up a control model of the system to verify its feasibility. So the improved dry powder inhaler is efficient and easy to use, meeting with the needs of patients.
In this paper, a 3 degree-of-freedom bearingless permanent magnet motor with axial active suspension is proposed. The structure and suspension principle of this novel bearingless permanent magnet motor are described in detail and its suspension mathematical models are constructed. Based on the mathematical models, a control system is designed for the new type bearingless permanent magnet motor. The...
Using the WRF model and NCEP data, a typical winter sea-land breeze progress in China tropical island was simulated, analyzing the impact of wind field simulation with the horizontal resolution, analog range, nesting level, and analog time. The results showed: the simulate effects of the WRF model could not always keep step with the increase of horizontal resolution. Obviously there was a threshold...
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