CONTINUOUS TUNING OF SHIP PROPULSION SYSTEM BY MEANS OF PNEUMATIC TUNER OF TORSIONAL OSCILLATION

2021 ◽  
Vol 158 (A3) ◽  
Author(s):  
J Homišin ◽  
P Kaššay ◽  
M Puškár ◽  
R Grega ◽  
J Krajňák ◽  
...  
Keyword(s):  
Mechanical System ◽  
Dynamic Properties ◽  
Torsional Oscillation ◽  
Self Regulation ◽  
Mechanical Systems ◽  
New Method ◽  
Driving Mechanism ◽  
Optimal Tuning ◽  
Continuous Tuning ◽  
The Given

Mechanical system drives consist of driving machines and gearing mechanisms interconnected by shafts and couplings. In terms of dynamics it is possible to say that every driving mechanism is able to oscillate. Especially piston devices can create excessive torsional oscillation, vibrations, as well as noise. Important task of a designer is to reduce torsional oscillation in mechanical systems. Presently this problem is mainly solved by the flexible shaft couplings that are selected with regard to the dynamic properties of the given system. It means that every torsional oscillating mechanical system needs to be suitably tuned. The aim of this paper is to present the possibilities of controlling of dangerous torsional oscillations of the mechanical systems by the means of new method, i.e. its optimal tuning by means of the pneumatic coupling with self-regulation, which were developed by us.

scholarly journals On the integrable deformations of a system related to the motion of two vortices in an ideal incompressible fluid

2019 ◽  
Vol 29 ◽  
pp. 01015 ◽  
Author(s):  
Cristian Lăzureanu ◽  
Ciprian Hedrea ◽  
Camelia Petrişor
Keyword(s):  
Incompressible Fluid ◽  
Mechanical System ◽  
Integrable Systems ◽  
Degrees Of Freedom ◽  
Mechanical Systems ◽  
Ideal Incompressible Fluid ◽  
First Integrals ◽  
Integrable Deformation ◽  
Integrable Deformations ◽  
The Given

Altering the first integrals of an integrable system integrable deformations of the given system are obtained. These integrable deformations are also integrable systems, and they generalize the initial system. In this paper we give a method to construct integrable deformations of maximally superintegrable Hamiltonian mechanical systems with two degrees of freedom. An integrable deformation of a maximally superintegrable Hamiltonian mechanical system preserves the number of first integrals, but is not a Hamiltonian mechanical system, generally. We construct integrable deformations of the maximally superintegrable Hamiltonian mechanical system that describes the motion of two vortices in an ideal incompressible fluid, and we show that some of these integrable deformations are Hamiltonian mechanical systems too.

scholarly journals Motion of mechanical systems with non-ideal constraints

2013 ◽  
Vol 35 (2) ◽  
pp. 157-167
Author(s):  
Do Sanh ◽  
Dinh Van Phong ◽  
Do Dang Khoa
Keyword(s):  
Theoretical Analysis ◽  
Mechanical System ◽  
Mechanical Systems ◽  
New Method ◽  
Physical Parameters ◽  
Interactive Environment ◽  
Reaction Forces

In the paper a new method to consider a mechanical system with non-ideal constraints is presented. It is proved that a mechanical system subjected to physical non-ideal constraints cannot be determined purely by theoretical analysis because the reaction forces depend on the physical parameters of interactive environment, which are defined only by measurement. The Principle of Compatibility is shown to be an effective tool in combination with experience for investigating such a problem. For illustration the dynamics of a digging machine are investigated.

scholarly journals Measurement of Air Springs Volume Using Indirect Method in the Design of Selected Pneumatic Devices

2018 ◽  
Vol 12 (1) ◽  
pp. 19-22
Author(s):  
Matej Urbanský ◽  
Jaroslav Homišin ◽  
Peter Kaššay ◽  
Jozef Krajňák
Keyword(s):  
Mechanical System ◽  
Mobile Device ◽  
Distribution System ◽  
Indirect Method ◽  
Control Method ◽  
Torsional Oscillation ◽  
Air Pressure ◽  
Continuous Tuning ◽  
Extremal Control

AbstractAt our department, we deal with continuous tuning of torsional oscillating mechanical systems (TOMS) during their operation in terms of torsional oscillation size. Therefore, a new mobile mechanical system was built for purposes of research and presentation of the TOMS continuous tuning using extremal control method, which main advantage is that we do not need to know a mathematical model of the mechanical system. The new mobile device is equipped with a special compressed air distribution system, which important components are air springs. The air springs are modified and used as air pressure tanks with various functions in the mobile device. Therefore, it is important to know the magnitude of the air springs inner volume. This paper deals with determination of air springs volume using indirect method, which is based on the air pressure measurement and also the comparison of obtained results with the results computed from air springs manufacturer data.

About the Stabilization of Anisotropic Cylindrical Shell With Elastic Filling

2000 ◽  
Author(s):  
Vladimir Sarkisyan ◽  
Sarkis Sarkisyan
Keyword(s):  
Differential Equation ◽  
Cylindrical Shell ◽  
Mechanical System ◽  
Mechanical Systems ◽  
Elastic Base ◽  
Optimal Stabilization ◽  
Convergence Of Series ◽  
Symmetric Kernel ◽  
The Given ◽  
Anisotropic Cylindrical Shell

Abstract The problems about the optimal stabilization of mechanical system of a potency of continuum have the large interest, both theoretical and practical. The solution of such problems is reduced to the nonhomogeneous integro-differential equation with the symmetric kernel. The essential results in the solution of problems of the optimum stabilization for mechanical systems of a potency of continuum are obtained [4], [5]. In work [4,5,6] the convergence of series of solutions and the finiteness of a target functional is proved uniformly. Solved a numerous problems of the optimal stabilization of vibrations of plates and rather slanting shells. In various statements the problem of the optimal stabilization for anisotropic cylindrical shells are solved in [6] etc. The given work is attempt to fill in a gap the problems of the stabilization by the problems about the optimal stabilization of vibrations of shells with filling, where the filling as Winkler’s elastic base, and for filling of Vlasov’s model [3] is considered.

The Control of Vibration Transmissibility Using an Electrodynamic Actuator –Close-Loop Solution

2013 ◽  
Vol 436 ◽  
pp. 166-173
Author(s):  
A. Mihaela Mîţiu ◽  
Daniel Constantin Comeagă ◽  
Octavian G. Donţu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Mechanical System ◽  
Closed Loop ◽  
Mechanical Systems ◽  
Vibration Transmissibility ◽  
Technical Solutions ◽  
The Mathematical Model

In this paper are presented some aspects of transmissibility control of mechanical systems with 1 DOF so that the effects of vibration on their action to be minimized. Some technical solutions that can be used for this purpose is analyzed. Starting from the mathematical model of an electro-mechanical system with 1 DOF, are identified the parameters which influence the effectiveness of the transmissibility control system using an electrodynamic actuator who work in "closed loop".

Controlled Arming of Mechanical Systems Embedded into Embarked Electrical Systems

2014 ◽  
Vol 555 ◽  
pp. 209-216
Author(s):  
Gheorghe Negru
Keyword(s):  
Kalman Filter ◽  
Mechanical System ◽  
High Speed ◽  
Mechanical Systems ◽  
Electrical Systems ◽  
General Motion

The paper presents an application of the Kalman filter to achieve the controlled arming of mechanical system embedded into embarked electrical systems (FMES). The solution of FMES which contain mechanical subsystems electronically controlled could significantly reduce the influence, on their functioning, of the general motion of high speed object (HSO) .

The Method for Determining the Vibration-Damping Elements for the Mechanical System to Obtain the Desired Amplitude Value

2014 ◽  
Vol 657 ◽  
pp. 644-648 ◽  
Author(s):  
Andrzej Dymarek ◽  
Tomasz Dzitkowski
Keyword(s):  
Mechanical System ◽  
Dynamic Characteristics ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Vibration Damping ◽  
Displacement Velocity ◽  
Synthesis Methods ◽  
Resonance Frequencies

The paper presents the use of synthesis methods to determine the parameters of passive vibration reduction in mechanical systems. Passive vibration reduction in a system is enabled by units called dampers whose values are determined on the basis of the method formulated and formalized by the authors. The essence of the method are, established at the beginning of a task, dynamic characteristics in the form of the resonance and anti-resonance frequencies, and amplitudes of displacement, velocity or acceleration of vibration.

scholarly journals Psychophysiological predictors of mental adaptability among specialists of extreme profile (servicemen)

2017 ◽  
Vol 7 (4) ◽  
pp. 137-150 ◽  
Author(s):  
M.E. Kovaleva ◽  
V.G. Bulygina
Keyword(s):  
Dynamic Properties ◽  
Self Regulation ◽  
Self Control ◽  
Psychomotor Activity ◽  
Psychophysiological Study ◽  
Situational Anxiety ◽  
Single Factor Analysis ◽  
High Level ◽  
Psychological Features ◽  
Personal Questionnaire

The results of a comprehensive psychological and psychophysiological study of the characteristics of mental self-regulation in the simulation of various stressful situations in the specialists of extreme profile on the example of servicemen were described in the article. The integrated protocol of the study by the method of biofeedback with consideration of various indices of the central and autonomic nervous system under conditions of stress stimulation was developed. The set of psychological questionnaires was used to diagnose psychological features of self-regulation: questionnaire of self-control H. Grasmik, questionnaire "Style of self-regulation of behavior" by V. I. Morosanova, the questionnaire BIS/BAS, the questionnaire formal - dynamic properties of individuality by V. M. Rusalov, personal questionnaire of the G. and S. Eysenck EPQ, the scale of anxiety Charles D. Spielberger. Statistical method of clustering by the k-means method, single-factor analysis of variance, multiple regression analysis were applied. Psychological and psychophysiological differences between mentally disadaptive and adaptive groups are described, as well as predictors of mental disadaptation for military personnel are identified. It was found that mental disadaptation among servicemen is characterized by a preference for simple tasks in the structure of self-control and a high level of reactive situational anxiety, reduced programming and evaluation indicators, psychomotor erbiness, intellectual speed, indices of psychomotor activity and general adaptivity. The psychophysiological profile of maladaptation differs from the normative indices with elevated indices of subcortical alpha and theta rhythms in the initial background, as well as an increased index of vegetative balance and a reduced index of activation of subcortical centers in the stress sample. Psychophysiological predicators of disadaptation were established.

A Project in the Determination of the Moment of Inertia

2005 ◽  
Vol 33 (4) ◽  
pp. 319-338
Author(s):  
Ron P. Podhorodeski ◽  
Paul Sobejko
Keyword(s):  
Dynamic Properties ◽  
Equations Of Motion ◽  
Mechanical Systems ◽  
Moment Of Inertia ◽  
Educational Goal ◽  
Centre Of Mass ◽  
Comparison Of Results ◽  
Physical Testing ◽  
The Moment

Analysis of the forces involved in mechanical systems requires an understanding of the dynamic properties of the system's components. In this work, a project on the determination of both the location of the centre of mass and inertial properties is described. The project involves physical testing, the proposal of approximate models, and the comparison of results. The educational goal of the project is to give students and appreciation of second mass moments and the validity of assumptions that are often applied in component modelling. This work reviews relevant equations of motion and discusses techniques to determine or estimate the centre of mass and second moment of inertia. An example project problem and solutions are presented. The value of such project problems within a first course on the theory of mechanisms is discussed.

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