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The new analytical method of acoustic field estimation in the room
Get PDFThe directional characteristics of sound fields in enclosures are investigation in this paper. The main object of this paper is to determine the impulse response of sound sources for calculating acoustics parameters in closed space. The new analytical method has been suggested as the result of theoretical studies. This method allows a quantitative and qualitative analysis of the interaction of dynamic processes of a sound source with air in a roo
New intelligent regulators for mechatronic systems
Get PDFThe paper considers new intelligent regulators combining accuracy and speed without overshoot as well as controls providing adaptability at guaranteed stability of controlled system in non-stationary conditions. The developed regulators connect target and actual values of output variables of the controlled system and criteria, enabling variation of properties of the criteria in an accessible form. The proposed adaptive regulators are capable to implement control near the capability limits and consequently provide solutions of known and new control tasks at a qualitatively new leve
Vibratory alignment of the parts during robotized assembly
No full textPaper deals with vibratory alignment of the components during robotized assembly as one of the parts is gripped by the robotic gripper and provided with vibratory excitation along the assembly direction. Numerical simulation of parts alignment was carried out. The dependencies of vibratory alignment duration on dynamic system and excitation parameters were determined. Existing areas of parameter sets, where reliable alignment is taking place, were defined. Results of numerical simulation were verified experimentally. Obtained results of numerical simulation and experiments demonstrated that under properly chosen system and excitation parameters, vibratory method may be successfully applied in robotized assembly for peg-hole parts alignmen
A flat compound piezoelectric actuator of a type “a shaking beam”
Get PDFIt is investigated piezoelectric actuator, consisting of two flat converters of longitudinal fluctuations which ends are close by the hence – « a shaking beam ». Also is resulted the principle of work actuator in quality stator of the motor, and also as the ultrasonic concentrator of fluctuations. Additionally is made research of it actuator with the help of programs computer modeling. And is carried out optimization of the sizes driver hence actuator. Theoretical researches are confirmed experimentally, with the help of the precision laser equipmen
Control of friction forces with stationary wave piezoelectric actuator
Get PDF"In the field of the research on piezoelectric motors, the control of friction forces by ultrasonic waves was studied mainly from an experimental point of view [1]. The principle of friction force reduction by imposed mechanical vibrations in unlubricated contacts was recently studied in order to reduce the friction losses in an internal combustion engine with Langevin type actuators [2]. This article deals with the advantages of flexural stationary wave piezoelectric actuators in the control of the friction forces thanks to their high pressures generated at high frequencies (>10 Khz). The use of specific contact geometry which is defined by the Hertz theory associated with partial slip contact conditions, allows optimizing the lubrication effect. In the case of piezoelectric torque limiter application, the design and the numerical simulation of dedicated piezoelectric actuator are compared. In agreement with the contact modeling, the characterization of the complete actuator on mechanical test bench validates the ""torque limiter"" function and the optimization of lubrication principle with dedicated contact geometry
Investigation of compression of packages
Get PDFThe model for the analysis of compression of a long structure with a constant thin-walled cross-section is presented. It is assumed that a structure experiences static compression and the problem of initial stability for a cross- section is solved. The analysis of compression of a shell-type structure is described assuming that a structure undergoes static compression and the problem of initial stability is solved. The results of experimental investigation of resistance to compression of paperboard packages are presented for different grammage of the materials of paperboard and for the machine and cross-machine directions of production of paperboard. The largest permissible vertical pressure load that the packages are able to resist is determine
Dynamic synchronization of the unbalanced rotors for the excitation of longitudinal traveling waves
Get PDFThe problem about the synchronization of the unbalanced rotors for the excitation of the longitudinal traveling waves in the elastic system of a bar type is examined. The steady-state regimes of motion are investigated, the conditions of their existence and stability are obtaine
Holographic interferometry methods for analysis & design of rotary converter
Get PDFA rotary converter used in mechanisms that require high precision displacement has proved that accuracy depends both on design and technological factors. An important feature of mechatronic systems containing links made of active sandwich beam is the performance of various functions by the same transducer thereby enabling the development of improved design methods. The analysis of various parameters and constructions of mechatronic systems has made it possible to introduce the mechanism containing a rotary converter which can turn any top around or turn a screw. A holographic interferometry method has been applied in the experimental work [1, 2
Research on wood gluing factors by a resonant oscillations method
No full textThis paper presents the methodology and equipment that is applied for experimental investigation of glued wood articles and their components by means of resonant vibrations. It is demonstrated that beam and plate, which form wood assortments along and across grain, may be studied by using theoretical calculations based on deformed beam vibrations. In addition, research data of oak glued-up panels of varying width as well as adhesive and scantlings are included. It was determined that the increase of width of the panels (the number of scantlings) practically does not change the shape of their first vibration mode. However, the research revealed slight changes in the amplitude-frequency characteristic, i.e., the first natural frequency increased up to 5 %, and the bandwidth decreased by 30 %. Irrespective of additional factors, the modulus of elasticity of the glued-up panels was higher by 10 % in comparison to average modulus of elasticity of the used scantlings, whereas damping coefficient was lower by 40 %. Obtained results may be used to evaluate the behavior of glued-up panels in the zone of dynamical loads and to produce glued-up panels with proper parameter
Computer-aided modeling of the adaptive intelligent vehicle safety systems
Get PDFThe paper presents classification of type of movement of motor vehicles and reports on computer-aided modeling and virtual design of active safety systems. An algorithm of identification of the moment of transition of wheel sliding from a steady range of sliding to unstable is described as well. In the presented research work results of computeraided modeling of anti-lock braking systems (ABS) that are based on a force principle are discussed and important questions of modeling and design of active safety system in CoDeSys environment are considere