Smirnov Yu.M.,National Research University Moscow Power Engineering Institute
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2017
Dissociative excitation of quartet levels of the manganese atom was studied in collisions of electrons with manganese dibromide molecules. Eighty-two cross-sections for transitions originating at odd levels and eleven cross-sections for transitions originating at even levels have been measured at an incident electron energy of 100 eV. An optical excitation function has been recorded in the electron energy range of 0-100 eV for transitions originating from 3d 64p z 4 F° levels. For the majority of transitions, a comparison of the resulting cross-section values to cross-sections produced by direct excitation is provided. © 2017 IOP Publishing Ltd.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT.2010.4.1-1. | Award Amount: 5.12M | Year: 2010
Flight tests of new or modified aircraft are a necessary part of the design process and provide the final validation of the full scale aircraft design. Flight testing for certification is a critical phase as all trials proving compliance with specifications and regulations must be completed in the shortest possible time, while maintaining high quality standards in the certification process. Usually a heavy instrumentation is installed to validate the predicted behaviour of the aircraft and also to detect unforeseen problems so that, if necessary, fast modifications can be done. Optical measurement techniques can minimize the installation effort and reduce the testing time as they are able to capture a huge amount of parameters within a short time. The preceding project AIM Advanced In-flight Measurement Techniques proved the principal feasibility to apply modern optical measurement techniques as being used in industrial wind tunnels to flight testing. The proposed follow-up project AIM intends to further develop these measurement techniques to be easily and routinely applied to in-flight testing with industrial demands. Thus, AIM focuses on developing reliable and easy to use dedicated measurement systems and on defining design and application rules for these new in-flight measurement techniques. The prime objective is to enable aerospace industries to use such mobile measurement systems in future to reduce testing time and costs. AIM will be structured in progressive steps starting with basic studies on challenges discovered in the preceding project leading to optimized measurement systems to be tested under research conditions and finally to be proven in an industrial environment. To do these steps in an effective way the partnership of AIM will comprise four partners from aerospace industries, including one SME, three research organisations and three universities with expertise in optical measurement techniques, flight testing and training.
Plastikov A.N.,National Research University Moscow Power Engineering Institute
IEEE Transactions on Antennas and Propagation | Year: 2016
A theoretical design of a Ku-band multibeam offset bifocal dual-reflector antenna (BFRA) with 40° field of view (FoV) suitable for satellite ground station applications is presented and discussed. The BFRA has a nearly square aperture with a dimension of about 4.5 m (191 wavelengths at a frequency of 12.75 GHz) and was designed for the required scan angle α = 18°. The antenna has a Gregorian configuration in the offset vertical plane and a Cassegranian configuration in the scanning horizontal plane. This BFRA was designed for a special application for which providing the maximum aperture efficiency (AE) (i.e., the maximum gain) is required and relatively high sidelobes are allowed. The calculated AE is greater than 52% and a directivity is about 54 dBi at 12.75 GHz within the whole FoV of 40° (which is equal to 100 beamwidths) in the scanning plane. © 2016 IEEE.
Plastikov A.N.,National Research University Moscow Power Engineering Institute |
Kogan B.L.,National Research University Moscow Power Engineering Institute
IEEE Antennas and Wireless Propagation Letters | Year: 2013
This letter presents a novel procedure for designing of three-dimensional offset bifocal reflector antennas (BFRAs). This procedure allows us to determine the reflector surfaces in analytical form as functions of two parametric variables. Initial design considerations are described. Two BFRA example designs with aperture dimensions of about 60 wavelengths are presented. One of them has a field of view of 47° for the whole main reflector aperture efficiency greater than 50%. Thus, the proposed procedure is suitable for designing scanning and multibeam reflector antennas with a wide field of view in one plane. © 2013 IEEE.
Kirsanov M.N.,National Research University Moscow Power Engineering Institute
Magazine of Civil Engineering | Year: 2015
An elastic spatial statically determinate truss of regular type, simulating the rectangular in plan coverage was considered. In the plane of the base the truss has two axes of symmetry. Four support structures (spherical hinge, cylindrical hinge and two vertical rods) are located at its corners. An analytic solution was found for forces in the rods of the truss. Using the Maxwell-Mohr's formula, the dependence of the deflection of the center was discovered in the truss under the influence of the concentrated force. There are five parameters of the problem in this formula: three linear dimensions, and the numbers of hinges on its lateral sides. To determine the desired patterns by means of the computer mathematics system Maple the recursion task by two parameters was solved. It was shown that dependence of the deflection on the number of panels and height of the truss detects a minimum, allowing optimizing the size of the structure.
Raskovskaya I.L.,National Research University Moscow Power Engineering Institute
Quantum Electronics | Year: 2013
The principles are outlined of laser refractive tomography - a method for reconstructing the values of the refractive index in the cross sections of phase objects, which involves the use of three-dimensional refractive images (3D refractograms) of structured laser radiation. A simulation algorithm is realised and examples are provided of characteristic 3D refractograms obtained by solving the direct problem of refraction of structured radiation. A method was developed for reconstructing the values of refractive index under conditions of strong refraction, which is based on the visualisation of ray trajectories inside an optically inhomogeneous medium. A classification is made of possible approaches to the solution of the inverse problem of refraction based on the visualisation of ray trajectories. Examples are given of cross section reconstruction and quantitative diagnostics of phase objects. © 2013 Kvantovaya Elektronika and Turpion Ltd.
Kirsanov M.N.,National Research University Moscow Power Engineering Institute
Magazine of Civil Engineering | Year: 2014
The paper estimates deformation of elastic, statically determinate cantilever truss of the large internal volume which is subjected to bending and torsional loads for an arbitrary number of structure zones. The volume is increased by replacing flat sides of the truss with raised ones. Forces in the bars are determined analytically by cutting nodes of the truss. We derive simple analytical expressions for deflection, which allows selecting the optimal size and asymptotically compare the design flexibility to the known systems. It is shown that the flexibility of the proposed design is comparable with the known systems. Graphs, showing the dependence of the deflection on the size and the number of zones, reveal extremes, which enables optimizing the geometry of the truss. We have derived the accurate formulas for optimal parameters of the truss deflection. The induction method, supported by Maple mathematics software, is used.
Kharitonov V.Y.,National Research University Moscow Power Engineering Institute
Proceedings - VRCAI 2012: 11th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry | Year: 2012
Dead reckoning algorithms are employed in collaborative virtual environments (CVEs) for predicting virtual objects states at any given moment of time that makes it possible to minimize bandwidth requirements while maintaining required data consistency. However, existing implementations often do not take into account information on the object motion dynamics and, in general, apply static prediction models. In this paper a novel motion-aware adaptive dead reckoning algorithm (MAADR) is introduced based on dynamical prediction model selection depending on the object motion pattern. The results show that considerable reduction in a number of update messages can be achieved without sacrificing prediction accuracy. In addition, it becomes possible to dynamically adjust the size of update messages according to the motion pattern and, thus, provide more flexible use of network bandwidth. © 2012 ACM.
Anuchin A.S.,National Research University Moscow Power Engineering Institute
Russian Electrical Engineering | Year: 2014
Various methods of calculating parameters of a digital PI controller for a microcontroller system are considered. The adequacy of replacement of a PWM VSI, system of current measurement, and a digital controller by an equivalent inertial element for the calculation of miocrocontroller parameters is shown. The possibility of setting time reduction to one PWM period weithout overshoot and ringing with PI controller is shown. © 2014 Allerton Press, Inc.
Dubinskii Y.A.,National Research University Moscow Power Engineering Institute
Russian Journal of Mathematical Physics | Year: 2013
In the paper, two boundary value problems for the system of Poisson equations in three-dimensional domains are studied. © 2013 Pleiades Publishing, Ltd.