Browsing by Subject "amplitude-frequency characteristic"
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Item Experimental research on the influence of the production quality of tooth operation surfaces of cylindrical gearwheels and torque on a gear oscillation amplitude(Commission of Motorization and Energetics in Agriculture, 2014) Vasyljeva, О.; Kuzio, I.For carrying out experimental research a proving stand with closed power flow was designed. For the determination of oscillation process parameters (amplitude and frequency) the devices with input signals from strain sensors were used. Planning the experimental research and mathematical treatment of the results obtained was performed with the use of a full factorial experiment. The results of the experiment allowed for obtaining a nonlinear mathematical model for determining the oscillation amplitude and the amplitudefrequency characteristic of gear box oscillations (first harmonic). It then is used for determining the harmonic of the oscillating process caused by the inaccuracy of a tooth operating profile, which influences the smoothness of gear operation. The dependences taking into account internal and external dynamic loads from oscillating processes during the calculations of teeth gear hardness were obtained.Item Substantiation of parameters and analysis of operational characteristics of oscillating systems of vibratory finishing machines(Lviv Politechnic Publishing House, 2017-10-19) Korendiy, Vitaliy; Zakharov, Viktor; Lviv Polytechnic National University; ISKRA PJSCThe 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. On the basis of synthesized inertial and stiffness parameters, the amplitude-frequency characteristics of the oscillating systems of vibratory finishing machines are formed and analyzed. In order to verify the validity of the proposed theoretical approaches, the simulation of the mathematical model of the oscillating system motion is carried out by means of numerical solving of the system of differential equations of the oscillating masses motion. The proposed structural diagrams and the operation schemes of the vibratory finishing machine, as well as the derived analytical formulas may be used by designers, researchers and technologists while improving existent and developing new equipment for vibro-finishing treatment.Item Ідентифікація критеріїв для енергоощадного керування віброприводами адаптивних вібромашин(Видавництво Львівської політехніки, 2015) Чубик, Р. В.; Зелінський, І. Д.Ідентифіковано критерії для чіткого та однозначного визначення адаптивною системою керування динамічних параметрів віброприводів положення робочої точки вібраційної технологічної машини на її амплітудно-частотній характеристиці у процесі реалізації довільного технологічного вібропроцесу. Criteria for an accurate and unambiguous definition of vibrodrive dynamic parameters are identified by an adaptive control system - a position of the operating point of vibratory technological machines at its amplitude-frequency characteristic in the implementation of its random vibration process.