This article illustrates a system for stabilizing objects in space based on integral fiber elements. The proposed system showed results commensurate with similar systems with a length of tens of kilometers of SMF-28 optical fiber, while using PANDA type optical fiber is only 200 m. In the work, a model of the system was developed and experimental studies of the response and angular velocity of the gyroscope were carried out.
The paper presents the mathematical apparatus for precise calculation of the three-dimensional point spread function (3D PSF) of optical systems. The method is based on the Huygens-Fresnel principle: a spherical wave on the threedimensional surface of the exit pupil is considered as result of the superposition of elementary secondary point radiation sources. These point sources emit coherent electromagnetic waves with a spherical wave front. They form a certain distribution of generalized complex amplitudes in three-dimensional space near the focus point. This distribution is used to calculate the intensity distribution in the focus area of the optical system, which is the PSF. The advantage of the proposed technique is direct calculation of the 3D PSF with taking into account wave aberrations and without usage of Fresnel or Fraunhofer approximations. In case of small aperture optical systems the proposed technique coincides with classical theory that specifies the link between a pupil function and PSF via Fourier transform. The differences between precise and approximated techniques for 3D PSF calculation are also discussed.
An approach to solving the problem of monitoring the surface shape of a radiation spot in real time is presented. An analysis of the use of the cross-sectional method to monitor the shape of the surface of a radiation spot in real time has been carried out. The possibility of using the aspect ratio to solve the problem was considered. Experimental studies of the sectional method and the aspect ratio method are also presented.
The paper proposes a new method for calculating the weight coefficients of an artificial neural network in the systems of technical diagnostics of hydro aggregates, in which it is proposed to use the coefficients of correlation between vibration signals in spatially distributed points of a hydro aggregate. A mathematical model and algorithm for calculation of weight coefficients of an artificial neural network are developed. The expediency of use of wavelet transformation of time realizations of a vibration signal is shown, as a result of which the received vibration signal is divided into amplitude-frequency-time spectrum, which leads to increase its informativeness. Experimentally confirmed the presence of strong inter-correlation links between spatially distributed points of the hydro aggregate and their dependence on the nature and place of application of disturbing forces. The dependence of the correlation coefficients on the load of the hydro aggregate and the water pressure in the reservoir is established. The obtained results can be considered as an experimental confirmation of the expediency of using the proposed method for calculating the weight coefficients of an artificial neural network.
Proposed in the paper are the new algorithms for vibration-based diagnostics of existing defects in hydraulic units. They are based on an artificial neural-like network, which implements spectral analysis of vibroacoustic signals using threedimensional amplitude-frequency-temporal spectra of these signals, such spectra being obtained using discreet wavelet transformation.
The article presents the mechatronic hydraulic drive circuit, designed in Vinnytsia National Technical University. For the mechatronic hydraulic drive a linear mathematical model is developed. The influence of the mechatronic hydraulic drive parameters on static, dynamic and energy characteristics is investigated. Optimization parameters and their variation ranges are determined. In the process of parametric optimization such combination of parameters has been found, which provides optimal values of the mechatronic hydraulic drive characteristics.
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