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This paper focuses on the influences of the plasma sheath around a hypersonic vehicle on the impedance of antenna. The practical plasma sheath of an RAM-C vehicle when flying at 71km at the speed of 25.91 Ma is calculated by fluid analysis method. And the effects of the plasma sheath on the impedance of a dipole antenna which is working at 4GHz are then researched by electromagnetic analysis method...
The classical fourth-order Runge-Katla integrator and the third-order force gradient symplectic integrator are used to solve the two-dimensional H'enon-Heiles system respectively. Numerical results, including the relative energy error, Poincare section, the largest Lyapunov exponent and Fast Lyapunov Indicator, are compared in detail. It is found that the Runge-Katla algorithm does not conserve the...
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