# oscillations

## The influence of the vehicle’s suspension malfunction on its operational efficiency

The main malfunctions that arise when operating a vehicle in Ukraine are the failure of the suspension elements and vehicle tires due to the poor condition of the most roads [11]. The car suspension elements soften the dynamic loads and smooth out the oscillations from the unevenness on the road while riding and provide a good stability and smoothness of the car ride.

## Виявлення шляхів подальшого вдосконалення високоефективних міжрезонансних коливальних систем

В статті обґрунтовується можливість подальшого вдосконалення високоефективних міжрезонансних коливальних систем. Для цього пропонується застосувати дискретно-континуальну коливальну систему, в якій третя надлегка маса використовується як тіло з розподіленими параметрами (надлегка гнучка маса).

## Substantiation of Parameters and Analysis of Operational Characteristics of Oscillating Systems of Vibratory Finishing Machines

The calculation diagrams of oscillating systems and operation features of vibratory finishing machines are considered. The mathematical models of three-mass and four-mass oscillating systems are presented. The amplitude values of the oscillating masses displacements are derived. The functions of inertial and stiffness parameters optimization are formed. The optimization problems are solved with a help of MathCAD software.

## Optimization of Structure of Sorting Vibratory Separators

The problem of substantiation of operational efficiency of vibratory separators designed on the basis of vibratory hopper feeders with electromagnetic vibrations exciters and with conic working bowls is considered in the article. The complex of factors influencing the accuracy and productiveness of separation of coins and disk-shaped products on two or more fractions is overviewed. New models of structures for the effective solution of separation problems are proposed.

## Порівняльний аналіз віброударних резонансних систем дво- та тримасової структури з лінійним тертям

The optimization model based on the criteria of energy efficiency of vibration systems is considered. This criterion is presented as the ratio of maximum of the working mass acceleration to consumption power of system. Optimization task is added of constraints that determine the technological aspects of vibrational resonant type - the width of the resonance zone, coefficient asymmetry of acceleration, maximum acceleration of the working mass. Searching of stiffness of asymmetric piecewise linear elastic properties at the basic of synthesis is entrusted.

## Two-mass Vibratory Conveyor-manipulator with Three-Component Electromagnetic Drive

Vibratory conveyor with three-component oscillations provides the opportunity to move the piece goods and details for any trajectory on a plane. Phase difference between independent horizontal (longitudinal or transverse) and vertical (normal) oscillations releases elliptical vibration of conveyor in plane perpendicular to the conveyor’s track. Elliptical vibrations allow increasing conveying velocity and inclination angle of conveyor’s track in comparison with the simplest linear vibrations.

## The hydro-automatic damping system against dynamic vibrations

A review and analysis of the developed hydraulic system for quenching dynamic oscillations has been carried out. A mathematical model for determining the operation delay time of the hydraulic system of the dynamic quenching of oscillations has been created. A period’s calculation of cleavage of the soil and the operation delay time of quencher dynamic oscillations from which it is possible in theory to establish the ability of the hydraulic system of dynamic quenching of oscillations to operate in due time is performed.

## Research of influence of oscillations of tool-part system on roughness of surface layer during high-speed friction strengthening

During the discontinued friction strengthening except of the high-speed friction the processes of high-frequency shock loadings appears in the tool-part contact zone. The vibrations occur in the machine elastic system. During the vibrations of elastic systems, in the material of elastic elements and in the connecting units of the structure parts the energy dissipation into the ambient medium takes place. The energy dissipation of vibrations occurs due to the influence of the inelastic resistance forces on which the energy of the oscillatory system is spent.

## Low vibrokavitator for cavitation processing chemically active fluids, fluids under pressure and at elevated temperatures

The description of law frequency vibrocavitator design for cavitational processing of chemically active liquids, liquids under pressure and high temperature is carried out. Its basic design and technological parameters are set up; by controlling them one can choose optimal regimes of cavitational processing. A special device for choosing range frequency fluctuation of cavitation breakers is developed.

## Determining the frequency characteristics of the elastic element dynamic quencher fluctuations.

The paper deals with the application of a new method of stress state analysis for the specified influence of the layered beams with masses on their dynamic characteristics. The proposed theoretical model takes into account layer deformation considering a transversal displased deformation, general deformation and strain. Numerical examples are under discussion: the frequency spectrum and damping dependence from the anisotropy of mechanical properties of layer beams. The results are used for optimal design of dynamic quencher fluctuations.