排序方式: 共有8条查询结果,搜索用时 3 毫秒
1
1.
A. M. Arkhimov M. A. Izyumov D. M. Khzmalyan 《Journal of Engineering Physics and Thermophysics》1971,21(6):1539-1544
An analysis is made of the laws which govern isothermal flow in the mixing zone of an ejection chamber with a longitudinal pressure gradient. The proposed method of calculations has been verified experimentally.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 21, No. 6, pp. 1060–1067, December, 1971. 相似文献
2.
Two iterative methods for arbitrary antenna array pattern null phase synthesis are presented. The problem is solved in RMS approximation and is reduced to minimisation of non-negative functionals by element excitation phases. The methods are based on its numerical-analytical minimisation by one phase or by two phases on each iteration 相似文献
3.
Zaitsev G. V. Khzmalyan A. D. 《Journal of Communications Technology and Electronics》2021,66(5):567-580
Journal of Communications Technology and Electronics - The problem of synthesis of low-order polynomial window functions with an arbitrarily specified decay rate of spectral lobes (optimal with... 相似文献
4.
An efficient phase-only control method is reported for shaping a given antenna array amplitude pattern and simultaneously placing adaptive s in unknown interference directions. The method iteratively minimizes a functional (that incorporates constraints imposed on the desired pattern shape and power measured at the array output) with respect to phases of the array element excitations and to the phase of the given amplitude pattern by a coordinate-by-coordinate (single-coordinate) method that finds the minimum along each coordinate by a closed-form formula using three power measurements per one iteration. The method shows fast convergence, is stable to phase shifter errors, and complies with the digital phase control. Results of computer modeling are provided. 相似文献
5.
An efficient unified approach to the solution of a wide class of electromagnetic problems involving finite structures-including analysis of finite-array antennas (both transmission and reflection), scattering problems, and calculation of transmission-line eigenwaves-is presented. This approach is based on the fact that these problems can be described by the same mathematical tool, namely, convolution-type systems of linear algebraic equations (systems with matrices having a Toeplitz type of structure). Efficient methods are proposed for solving them 相似文献
6.
Khzmalyan A.D. Povolotsky F.K. 《Antennas and Propagation, IEEE Transactions on》2002,50(10):1483-1485
It is shown that for a wide class of aperture distributions, the aperture efficiency can be related to the ratio between the beamwidth of this distribution and that of the uniform one. A heuristic rule for estimating the aperture efficiency of elliptic and rectangular tapered apertures is introduced. It is shown that, if the beamwidth is given (i.e., the aperture size is unconstrained), the maximum directivity is provided by a tapered, rather than uniform amplitude distribution. 相似文献
7.
Zaytsev G. V. Khzmalyan A. D. 《Journal of Communications Technology and Electronics》2020,65(5):502-515
Journal of Communications Technology and Electronics - A synthesis problem is solved for low-order windows with the sidelobe spectrum falloff rate equal to 12n decibel per octave (dB/oct), where n... 相似文献
8.
An iterative fast-convergent phase-only method for shaping the amplitude spectrum of a packet of radio pulses is developed. Its efficiency is verified by a numerical experiment 相似文献
1