Olena Bezvesilna

A Mathematical Model of the Thermo-Anemometric Flowmeter

A thermo-anemometric flowmeter design and the principles of its work are presented in the article. A mathematical model of the temperature field in a stream of biofuel is proposed. This model allows one to determine the fuel consumption with high accuracy. Numerical modeling of the heater heat balance in the fuel flow of a thermo-anemometric flowmeter is conducted and the results are analyzed. Methods for increasing the measurement speed and accuracy of a thermo-anemometric flowmeter are proposed.

Piezoelectric Gravimeter of the Aviation Gravimetric System

In the article the functional schema of the aviation gravimetric system is reviewed, its structure and the possibility of using the piezoelectric sensor as the gravimeter is analyzed, the options for installing and fixing the piezoelectric gravimeter of the aviation gravimetric system are presented.

Thermoanemometric Flowmeter of Biofuels for Motor Transport

For vehicles, especially those running on the biofuel, the thermo-anemometric flowmeters are considered promising. The thermo-anemometric flowmeters, the design of which is based on dependence between the amount of heat expressed by the heating element located in the fluid flow and its mass consumption, are of particular interest. The thermo-anemometric flowmeter operating as a part of the hardware and software to measure the biofuel consumption by motor vehicles was developed, manufactured and customized. All its 13 channels were calibrated. The dependences of the “voltage-temperature” for sensitive elements of each channel were obtained.

Two-Channel MEMS Gravimeter of the Automated Aircraft Gravimetric System

A new two-channel gravimeter of the automated aircraft gravimetric systems (AGS), the design of which is based on MEMS technology, was considered. It was established that the accuracy and speed of the new gravimeter is higher as compared to the currently known counterparts. A new two-channel gravimeter operating principle was described and its main advantages were shown, i.e. the lack of the error signals in the two-channel gravimeter output signal from the impact of vertical acceleration and residual nonidentity of the structures of two capacitive elements. The issue of filtering the output gravimeter signal from high-frequency noise was solved. It was established that the AGS accuracy with a two-channel MEMS gravimeter to measure the anomalies of gravity acceleration is 1 mGal.

Introducing the principle of constructing an aviation gravimetric system with any type of gravimeter

Measurements of parameters of the Earth’s gravitational field from aircraft are the most important because they make it possible to carry out measurements in the zones of poles areas the Earth, the equator, mountain ranges and other hard to reach areas of the Earth. Studying these parameters is necessary for the exploration of mineral resources, forecasting earthquakes, tsunamis, etc. We put forth general principles for constructing aviation gravimetric system (AGS) with any type of gravimeter. A list of basic components of AGS is compiled: gravimeter of any type, system for determining navigation parameters, altitude gauge, and onboard computing machine. We analyzed methodological errors of the system. Precision requirements to the components of AGS are formulated, provided the accuracy of AG measurements is 1–2 mGal. The choice of natural oscillation frequency of the AGS gravimeter is substantiated, which is 0.1 s -1 . The equation is derived that takes into account correction from the impact of angular velocity of the Earth rotation. We substantiated the application of a dual-channel method to construct an AGS gravimeter. Expedience of employing neural networks is demonstrated to eliminate instrumental errors of the AGS gravimeters.

Calorimetrie flow meter of motor fuel With Inlet temperature regulation

Calorimetrie flow meter of motor fuel (bio-fuel) with extended precision of fuel consumption measurement was developed. Extended precision is provided by the temperature control at the entrances of the tube of fuel forward flow and the tube of fuel backflow.

Heat Transfer in the Thermo-Anemometric Flowmeter for Biofuels

This paper analyzes the heat transfer in the thermo-anemometric flowmeter tube for biofuels. The equation of heat transfer in the radial and axial directions of the tube anemometer was obtained. These equations take into account the properties of a “biological” component of the mixed fuel based on diesel fuel and gasoline upon measurement of their consumption by the thermo-anemometric flowmeter.

Gravimeters of Aviation Gravimetric System: Classification, Comparative Analysis, Prospects

The article represents the results of a comparative analysis of existing gravimeters of aviation gravimetric system and identifies their strengths and weaknesses. It also represents and considers structures of the existing types of gravimeters that are used as elements of aviation gravimetric systems, and analyzes metrological characteristics of such sensitive elements. The paper describes modern advanced developments in the field of construction of innovative aviation gravimeters.

Simulation of influence of perturbation parameters on the new dual-channel capacitive mems gravimeter performance

The paper considers a new dual-channel capacitive MEMS gravimeter of the automated aviation gravimetric system whose accuracy exceeds that of gravimeters that exist at present. It describes in detail its design, which consists of two identical channels. Each of them contains capacitive elements. The connection in series of the adder, amplifier, digital module and OC is performed by means of shielded coaxial cables. All this provides for an increased accuracy in measuring the anomalies of the acceleration of gravity and eliminates the impact of error from vertical acceleration. The simulation of the suspension with complex shape was carried out: the magnitude of impact amounted to 10 µN, displacement of the end of the elastic element equaled 0.5 µm. Based on this refinement, it is possible to accurately determine the value of coefficient of elasticity of the folded suspension. The system was tested on stability by the Nyquist and Hurwitz criteria. Using PC, a change in the initial signal was examined for different values of perturbation amplitudes and frequency for the most unfavorable resonance cases of a dual-channel capacitive gravimeter. An analysis of data revealed that an increase in amplitudes of horizontal acceleration does not affect the amplitude of the forced DCG oscillations. Thus, the aviation gravimetric system proposed provides for a significant increase in accuracy of measuring the anomalies in the acceleration of gravity, and is appropriate for implementation.