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1

Vibration isolators test bench

Pobedin A., Kosov O., Shekhovtsov K.

Journal of KONES

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2011

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Vol. 18, No. 1

457-462

EN

The description of the scheme and design of the test bench for testing vibration isolators intended for use in the vehicle's cabin suspension. Test bench construction allows to implement a wide range of loadings on vibration isolator of the vehicle cabin, to investigate the impact of the loading's arm changing and to perform analysis of the vibration isolator’s elastic and damping characteristics changing impact on cushioning quality. Variant of the test bench construction modernization, which can allow applying typical exploitation loads, which include vertical and lateral components, is described. We propose a scheme of forced oscillations excitation system on the test bench by cam-eccentric mechanism. It includes a DC motor with stepless frequency regulation and with cams of different shape on its shaft, which affect the contact surface of the test bench's vertical H-beam of a rocker arm. We also propose a scheme of forced oscillations excitation system on the test bench by inertial exciter. It includes a DC motor with stepless frequency regulation with inertial vibration exciter on its shaft, which consists of a mass, placed eccentrically relative to the shaft axis. There are two variants of the test bench scheme – with the forced oscillations excitation device and without it.

2

The optimization of the design strength characteristics of the frame of the tractor

Babushkin A. E., Kosov O., Shekhovtsov V., Lyashenko M.

Journal of KONES

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2011

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Vol. 18, No. 1

10-14

EN

At present there are a many constructions of the carrier systems of motor transport means, bodies with the systems of communications in the form of rigid triangles executed in the form. This makes it possible to assume that the technical solution has high efficiency and correctly it can be examined in application to the tractors. An increase in the hardness, strength and longevity of frame due to an increase in the dimensions of the profile used or improvement of technology and design of the welded connections, which decrease the stress concentration in the region of the welds, can prove to be not the most rational solution from the point of view of labor expense and material consumption. More preferable in this respect the frame, made in the form of three-dimensional truss in lower part of which is fastened running apparatus, and inside are located engine, transmission, panels of skin of cowling and cab, control station. But since farm in “pure” form because of the impossibility to have struts on the front is hardly possible, although the inclined cross connection in the aperture of front glass of cab and does not contradict the requirements of field of view, has sense to speak about skeleton type frame, where only the sidewalls and the top of body to a greater or lesser extent answer the classical determination of farm.

3

The modelling of noise emission by the gearbox of vehicles gaz 3110, 31105

Pobedin A., Kosov O., Dolotov A., Dolgov K.

Journal of KONES

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2011

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Vol. 18, No. 1

453-456

EN

In the presented work the sound generation design procedure is presented. On its basis the mathematical model of calculation of the noise emission by a gearbox of cars of family GAZ-3110, 31105 is created. Diagrams of emission of noise by a gearbox depending on frequency of rotation of its entrance shaft and a backlash in gearing of teeths are received. They show, that in case an angular backlash in gearing radiated noise increases by 2-3 dB for each 0.5 degrees. As a result the methodology of the analysis of degree of wear of gearbox’s elements on the basis of noise spectrum should be created. We present the methodology of noise analysis of overmuch action of teeth based on the model of noise emission of elastic plates. According to the developed methodology we got the dependences of the acoustic emission of the gearbox for GAZ vehicle for the whole range of working speed of the engine from different level of wear of gears’ closed pairs. The analysis of the received data showed the increase of the acoustic emission by 1.2-1.5 times at the frequencies corresponding the overmuch action of the gears. This data can be used for analysis of the noise of a car to separate the noise of the gearbox, and also for counting and estimating the possible noise of a car.

4

Statistical analysis of gaz-3110 vehicles noise

Pobedin A., Kosov O., Dolotov A., Domolazov F.

Journal of KONES

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2009

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Vol. 16, No. 1

407-410

EN

This work presents the results of the statistical analysis of noise in several points of GAZ-3110 vehicles. There are also the dependences between the loudness of noise and speed of an engine or useful life of a car. It is difficult to confuse the noise of jet engine with reciprocating internal-combustion engine. Random factors also influence much the power level. Mechanism adjustment has its limits and so it can have different influence on its vibration and noise. Finally during the process of operation sliding surfaces do wear, screwed connections do loosen, other things happen and these lead to the changes in spectrum and level of noise. In this work we tried to evaluate the dispersion of GAZ-3110 vehicles noise levels according to the results of a coustic measurements in the immediate field of rondom acoustically active constructive assemblies. The range of noise loudness for the specific car model is defined at the level 20-25 dBA. The GAZ-3110 vehicles are characterized by the significant dispersion of noise level. The differences of noise level of individual cars are exceeding 20-25 dBA. vehicles noise considerably increases with the augmentation of useful life and rpm speed. The noisiest element of GAZ-3110 vehicles is internal combustion engine, then main gear even when first gear is operated.