DEVELOPMENT OF THE STRUCTURE OF LASER VIBRATION-MEASURING SYSTEMS WITH TWO OPTICALLY TREATED CHANNELS FOR NON-DESTRUCTIVE VIBRATION PARAMETERS

2019 ◽  
pp. 40-45
Author(s):  
V. V. Matrosova
Keyword(s):  
Measuring Systems ◽  
Vibration Parameters ◽  
Vibration Measuring ◽  
Non Destructive

Modeling the Effects of Underwater Detonation Wave

2013 ◽  
Vol 588 ◽  
pp. 175-183
Author(s):  
Andrzej Grządziela
Keyword(s):  
Vibration Spectrum ◽  
Water Environment ◽  
Underwater Explosion ◽  
Impulse Loading ◽  
Structure Model ◽  
Measuring Systems ◽  
Shaft Line ◽  
Hull Structure ◽  
On Line ◽  
Vibration Measuring

Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modeled by means of statistical methods. Much more problems arise from modeling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explosion is meant as a violent upset of balance of a given system due to detonation of explosives in water environment. A paper presents a proposal of identification of a degree of hazard the ships hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models.

scholarly journals Comparative study of selected bearing vibration measuring systems

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 498-500 ◽  
Author(s):  
Stanisław Adamczak ◽  
Mateusz Wrzochal
Keyword(s):  
Comparative Study ◽  
Roller Bearing ◽  
Rolling Bearing ◽  
Vibration Monitoring ◽  
Monitoring Systems ◽  
Measuring Systems ◽  
Bearing Vibration ◽  
Vibration Measuring

Roller bearing manufacturers have individual bearing vibration monitoring systems, consisting of several key components. Despite the fact that the principle of operation of these systems is the same, they differ from each other with some constructional solutions, whereas the type of construction used has an impact on the accuracy of measuring vibrations of a rolling bearing.

Investigation of Turbine Coolers Vibration Parameters

2003 ◽  
Author(s):  
Vladimir L. Simonov
Keyword(s):  
Air Conditioning ◽  
Technical State ◽  
Measuring System ◽  
Air Conditioning System ◽  
Vibration Parameters ◽  
Vibration Measuring ◽  
Angular Oscillations

Aviation turbine coolers (TC) are the main units in airplane air conditioning system. In this paper described are investigations aiming to estimate turbine coolers’ technical state using analysis of vibration parameters. In order to do this, an optoelectronic vibration-measuring system was designed. This system was intended for measurements of linear and / or angular oscillations of various points on housing and rotor of the turbine cooler. Appropriate software for vibration specters procession was created. Experiments were conducted in laboratory and plant conditions.

scholarly journals МЕТРОЛОГИЧЕСКОЕ ОБЕСПЕЧЕНИЕ КАЛИБРОВКИ КАНАЛОВ КОНТРОЛЯ ВИБРАЦИИ В СОСТАВЕ РЕГУЛЯТОРА АВИАДВИГАТЕЛЯ

2019 ◽  
pp. 151-156
Author(s):  
Анна Григорьевна Буряченко
Keyword(s):  
Vibration Frequency ◽  
Primary Transducer ◽  
Vibration Acceleration ◽  
Measuring Systems ◽  
Information Measuring ◽  
Predetermined Level ◽  
Normative Documentation ◽  
Vibration Measuring ◽  
Electric Signals

There are shown the normative documentation requirements concerning complete and element wise calibration of the information-measuring systems measuring channels. It is about requirements, which are applicable for tests area of aviation turbo-engines and their componentry, including the electronic regulators FADEC-type. There are given short information concerning the experience of JSC "Element" – certificated developer and manufacturer of such regulators – on providing of calibration (testing) of measuring channels with the use of imitators of electric signals of engine transducers. There is given the information concerning the ranges of measuring of vibrating accelerations and vibrating frequencies, which are required for providing of the engine vibrating monitoring and the information about the extreme high magnitudes of vibrating acceleration, which is interesting for the developer of the engine. There are covered the problems, which the developer of regulators deals with necessary to execute complete calibration of vibration measuring channels (jointly with a primary transducer), including the limitations laid on by the possibilities of accessible facilities of creation of vibration with the controlled magnitudes of vibration acceleration and vibration frequency in the required ranges of measuring. There are described the workplaces organized in JSC "Element" at the methodical help of SE "Ukrmetrteststandard" for providing of complete calibration of vibration measuring channels in laboratory terms at the enterprise-manufacturer, including the workplace with the resonator, which was specially developed and made. There are brought the results over of development, making and uses of the resonator, which provides controlled vibrations with the extreme level of vibration acceleration – 400 g and more at the predetermined level of vibration frequency.There is shown the expediency of element wise measuring channels calibration with the use of imitators of sensors signals for serial producing of regulators. There is explained the necessity to organize workplaces for the realization of complete calibration on enterprise-developer of FADEC regulators, which provide verification results got with imitators.

Luminescence from individual dislocations in II-VI and III-V semiconductors

1991 ◽  
Vol 49 ◽  
pp. 834-835
Author(s):  
J W Steeds
Keyword(s):  
Group Iv ◽  
Luminescence Properties ◽  
Carrier Recombination ◽  
Transmission Electron ◽  
Wide Range ◽  
Basic Physics ◽  
Semiconducting Compounds ◽  
Diamond Group ◽  
Non Destructive ◽  
Technological Significance

There is a wide range of experimental results related to dislocations in diamond, group IV, II-VI, III-V semiconducting compounds, but few of these come from isolated, well-characterized individual dislocations. We are here concerned with only those results obtained in a transmission electron microscope so that the dislocations responsible were individually imaged. The luminescence properties of the dislocations were studied by cathodoluminescence performed at low temperatures (~30K) achieved by liquid helium cooling. Both spectra and monochromatic cathodoluminescence images have been obtained, in some cases as a function of temperature.There are two aspects of this work. One is mainly of technological significance. By understanding the luminescence properties of dislocations in epitaxial structures, future non-destructive evaluation will be enhanced. The second aim is to arrive at a good detailed understanding of the basic physics associated with carrier recombination near dislocations as revealed by local luminescence properties.

Forensic Identifications Aided by Scanning Electron Microscopy of Silicone-Epoxy Microreplicas of Calcified and Cornified Structures

1975 ◽  
Vol 33 ◽  
pp. 678-679 ◽  
Author(s):  
R.F. Sognnaes
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Forensic Science ◽  
George Washington ◽  
Epithelial Surface ◽  
Extended Application ◽  
Tissue Surfaces ◽  
Non Destructive ◽  
Scanning Electron ◽  
Surface Changes

Sufficient experience has been gained during the past five years to suggest an extended application of microreplication and scanning electron microscopy to problems of forensic science. The author's research was originally initiated with a view to develop a non-destructive method for identification of materials that went into objects of art, notably ivory and ivories. This was followed by a very specific application to the identification and duplication of the kinds of materials from animal teeth and tusks which two centuries ago went into the fabrication of the ivory dentures of George Washington. Subsequently it became apparent that a similar method of microreplication and SEM examination offered promise for a whole series of problems pertinent to art, technology and science. Furthermore, what began primarily as an application to solid substances has turned out to be similarly applicable to soft tissue surfaces such as mucous membranes and skin, even in cases of acute, chronic and precancerous epithelial surface changes, and to post-mortem identification of specific structures pertinent to forensic science.

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