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Existing Nakagami fading simulation methods have the drawbacks of low precision, long simulation time or poor adaptability. This paper proposes a weighting method to generate random sequences that obedience to arbitrary distribution with analytical expressions. The proposed method can be applied directly to Nakagami-m envelope distribution simulation. Results show that mean square error and normalized...
With the application of finite element software ANSYS, the wireless electromagnetic short distance system was modeled and analyzed. By exerting AC excitation source on the transmitting coil, the distribution of magnetic lines of force and magnetic induction intensity at the receiving coil end was observed, which verifies the feasibility of current field transmitting downhole data. Through analysis...
This paper aims at GA's weakness and shortage of neighborhood search capability, proposed 3-opt based mutation operator, sub-path communicating operator and dynamic switching mutation of dual-point operator. The simulation results illustrate that the neighborhood search capability could be improved by this operator and the relatively steady solution could be gained as well. Hence, the research and...
As for the communication blackout problem encountered by hypersonic vehicles (HSV) due to the presence of plasma sheath. This paper first investigate the physical mechanism of plasma sheath and its interaction with radio wave briefly, and then focus on the relationship of phase shift with maximum plasma density, collision frequency, and the thickness of plasma sheath. Shift Operator FDTD algorithm...
Magnetorheological Elastomers (MREs) are synthesized from silicone RTV (room temperature vulcanizing) elastomer with magnetically soft iron particles. The iron particle concentration of the MREs is 70 wt %. To reduce the effect of oxidation on the MREs, the ATRP technique is used for surface polymerization of iron particles with fluorinated styrene as monomer. The mechanical properties of MREs are...
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