Abstract. This paper proposes mechanism and control algorithm for pneumatic relaxation system of suspension with vibration energy recuperation applied to standard vehicle operator seat ("Sibeko" company). Mathematical model of the seat pneumatic relaxation suspension with two additional air volumes was created. Pneumatic motor -recuperator activated by means of air flow from the one additional volume to another is installed in air piping between additional volumes. Computational research was made in Matlab/Simulink. Amplitude-frequency characteristics of transmission coefficient for standard and proposed suspensions were plotted for preliminary evaluation of vibration protection properties of seat suspension. Performed comparative analysis of amplitude-frequency characteristics shows that noticeable improvement of vibration protection properties of pneumatic relaxation suspension system with vibration energy recuperation in comparison with standard system both in region of resonance disturbances and in aboveresonance region. Main ways for further improvement of vibration protection properties of proposed system were marked out.At the modern stage of development of ground vehicles high values of operational characteristics (for example, specific power and operational speeds) led to the problem of improvement of the functional characteristics of suspension systems. These systems must provide necessary riding comfort during performing of technological operations and effective protection of operator from unhealthy influence of the low-frequency vibrations and noise.At the present time, operator's seat suspensions with nonlinear characteristics are believed to be the most effective. For example, suspensions with the pneumatic elastic element are widely used in modern tractors [6,7]. Standard unregulated shock absorber installed in these suspensions provides necessary damping of vibrations in the resonance zone but makes worse protection from vibrations in the above-resonance zone [2]. There are ways with various efficiency for solving of this problem, for example, using of active suspensions [3,8]. But the results of the performed analysis show that the most preferable one is the self-regulated suspension system with the semi-active control that doesn't require external power sources and operate effective in the whole frequency diapason of impacts. Also, availability of function of recuperation of absorbed vibration energy clearly increases efficiency factor and efficiency of the suspension in comparison with other suspensions that have standard unregulated dampers which dissipate vibration energy. This paper presents the proposed controllable pneumatic relaxation suspension of seat with the feature of recuperation of vibration energy. This suspension was created on base of the driver seat made by "Sibeko" company.The research was aimed at determination of ways for improvement of protection from vibration for the onesupport suspension system by means of using of the pneumatic relaxation suspension with availability ...

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The paper discusses issues related to the possibility of obtaining of the value of noise dispersion of towing vehicles by calculation. The authors obtained mathematical expressions to determine the dispersion of depending on confidence interval of individual noise sources. The article shows a general procedure for evaluating of probable dispersion of the results of the estimated noise of a vehicle.

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Simulink MatLAB, амплитудно-частотная характеристика. The paper proposes a mechanism and an algorithm for controlling a single-bearing pneumatic relaxation suspension system with energy recovery of oscillations applied to the standard seat of operator of Sibeko traction vehicle. Experimental studies of the static characteristic of a pneumatic suspension of a standard seat with a nonlinear elastic-damping characteristic have been performed. A mathematical model of a pneumatic relaxation seat suspension with two additional volumes of air is created, between which is installed an air motor - recuperator, which is activated by the flow of air from one additional volume to another. As a result of computational studies using the XY Graph Simulink MatLAB block-tool, the working elastic-damping characteristic of the simulated suspension system was obtained. The mathematical model, created taking into account the main provisions of theoretical mechanics and gas dynamics, realizes the concept of control of a single-bearing suspension system with a non-linear elastic-damping characteristic and absorption of vibrational energy at the end of compression and rebound strokes with a change in the direction of movement of the sprung mass. Calculation studies were carried out in the Simulink MatLAB software package. The working capacity of the mechanism and method of control of a single-bearing suspension system, realizing the necessary characteristic, has been confirmed. For the preliminary evaluation of the vibration-protective properties of the seat, amplitude-frequency characteristics of the transmission coefficients of the nominal and proposed suspensions were constructed. The performed comparative analysis of the amplitude-frequency characteristics revealed a noticeable improvement in the vibration protection of the pneumatic relaxation system of suspension with energy recovery of oscillations in comparison with the nominal one both in the region of resonant disturbances and in the resonant region. Based on the results of the analysis, the main directions for further improving the vibroprotective properties of the proposed suspension system are outlined.