Smart optical rotation speed transducer

This paper presents a transducer that was designed for rotation speed measurement of water meter impeller during verification procedure of counting mechanisms. In many cases, particularly when wet type water meters are verified, the impeller is obstructed by dregs, rust, etc. and therefore is hardly visible. When using filtration both in spatial and frequency domains, steady and reliable measurements are obtained. Both theoretical and experimental results are presented in this paper. In this research work transfer function of smart rotational speed measurement transducer is shown and various modes of input parameters are modeled. The reliability of the transducer output signal and its response to optical disturbances are modeled and real signals from transducer prototype are give

A method for air flow measurement using high frequency vibrations

Air flow measurements are very important in technological processes. A new air flow measurement method is proposed. The method is based on the interaction of air flow with the end of a fiber waveguide located in the flow. As the result of this interaction, random high frequency vibrations are generated in the fiber waveguide. The stochastic transducers are created for the realization of this method. The stochastic transducer consists of the fiber waveguide, the piezoceramic element and the preamplifie

Estimation of surface roughness using high frequency vibrations

Surface roughness is an important parameter for evaluating the quality of material surfaces. It affects the tribological and optical properties of the materials. The paper proposes a new method for estimation of surface roughness, which is based on measurement of high frequency vibrations that are generated when air flow interacts with the surface of a solid body. It was determined that intensity of high frequency vibrations depends on surface roughness. Sandpapers with different magnitudes of surface roughness were used for the experimental stud

The research system for vibration analysis in domestic installation pipes

A measurement and data processing system was developed for investigation of processes that influence sound propagation in pipes, which are commonly used in residence building industry. An impact-type excitation was mainly used for a controlled wide-band frequency mechanical vibrations excitation. Pipe surface vibrations were measured by means of accelerometers and microphones. Scanning device was used for positioning transducers over a tested pipe. The wave propagation and vibration analysis in pipeline segments of several types of pipes (plastic and metallic) was carried out. Because of various pipes working conditions, empty and filled pipes were tested as well. The experimental data indicates that both in metal and plastic pipes vibrations up to several kilohertz may propagate with low attenuation facto

Acoustic wave synthesis in dispersive media

There are many applications in non destructive testing, calibration of acoustic emission transducers, medicine, mechatronics etc., where waveguides with dispersive wave propagation properties are used. Generation of arbitrary displacements in this kind of waveguides is important and difficult. Possible solution to this problem is application of wave synthesis technique. This research shows that suggested technique allows to obtain arbitrary displacements of known form and duration in plates and stripes. Measurements of displacements were done in steel plate and stripe. Scanning of surfaces proved that it is possible to obtain arbitrary displacements in selected areas of the waveguides

Dynamic compensation of rotating blades imbalance

The purpose of this paper is to research an effect of factors that are creating an imbalance of fan rotating blades and to estimate the possibility of compensation for this parasitic effect. For this purpose the measurement system including hardware and software was developed. Measurements of vibrations and dynamic pressure of rotating two-blades fan, blades profile and lift force parameters at various rotation speed were performed. This paper presents compensation possibilities when mechanical and aerodynamic imbalance occurs

Analysis of fastening element impact on pipe modal vibrations

One of the approaches for noise reduction in pipeline transport systems lies in the selection of appropriate fasteners. Therefore, it is important to know how different pipe holders change vibrational behavior of the pipe. This paper investigates the influence of clamping elements on modal vibrations of the pipe. A measurement method is proposed for determination of the damping factor that appears due to the insertion of a pipe holder

Process Distribution in the Network Systems

Performing risk analysis of systems, evaluating reliability of technological objects, hazard of technological processes, we usually have to systems of network type and distribution of various processes in such systems. A well-known mathematical apparatus of diffusive processes example is dispersion in continuum medium (air, water, etc.). Process distribution in network systems is simpler, however, it much depends on network features. In this article theory of Markov chains is selected, distributions of different processes in transitional regimes are analysed as well as issues of their stability. Created models may be used in many different ways, for example, for the analysis or viruses in computer networks, hazard distribution in transport systems regarding transportation of hazardous materials, etc

Measurement system for analysis of autogyro rotor imbalance

This paper presents the measurement system that is designed for measurement and analysis of mechanical and aerodynamic unbalance. These types of unbalance occurs in mechanical systems composed of high radius blades, including rotorcrafts – autogyro. This work presents structure of the measurement system, processing and visualization process of measurement data

Evaluation of arbitrary waveform acoustic signal generation techniques in dispersive waveguides

In order to generate arbitrary mechanical displacements, i.e. acoustic signals of the microsecond range in dispersive waveguides, different existing signal processing techniques were analyzed and new techniques introduced. The proposed parameter Q was used for the comparison of the arbitrary waveform acoustic signal generation techniques. The arbitrary acoustic signal duration optimization parameter was introduced. The arbitrary waveform acoustic signal generation techniques were applied for the generation of the microsecond range duration acoustic signals