Optimal Tuning Method of Ships System by Means of Pneumatic Tuner of Torsional Oscillations

Abstract

Drives of mechanical systems consist of driving machines and gearing mechanisms connected together by means of shafts and couplings. With regard to the dynamics it is possible to say that every driving mechanism is a system, which is able to oscillate. Especially piston machines are able to create dangerous and harmful torsional oscillations, vibrations, as well as noisiness. Important task of designer is reduction of torsional oscillations in mechanical system. Presently this problem is solved predominately with a suitable adjustment of dynamic properties of flexible shaft couplings with regard to the dynamic properties of given system. It means that every torsionally oscillating mechanical system needs to be tuned suitably. The main purpose of this paper is presentation of controlling possibilities of dangerous torsional oscillations of mechanical systems by means of a new method, i.e. its optimal tuning by means of pneumatic coupling with self-regulation, developed by us. KEYWORDSdangerous torsional oscillations, tuning of mechanical system, behaviour of optimal tuning of the system, pneumatic coupling with self-regulation -pneumatic tuner.

Analysis of Lubrication Conditions for Angle Planetary Gearboxes Applied in Mining Scraper Conveyors

“…Around the world, research is being carried out to improve the durability and reliability of machine parts [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Stress-Strain State of Pneumatic Flexible Shaft Coupling for Ball Mill Drives

“…To determine the normal stresses in the selected part, the positions of the neutral layer were first determined by the following formula [4]:…”

“…However, these couplings are generally applied for the transmission of low and medium torque because of the low strength of rubber and polymers. The studies by Vinogradov and Homisin show that pneumatic flexible shaft couplings are free from these disadvantages and can transmit high torques with the possibility of adjusting rigidity within a wide range [3][4][5][6][7]. At present, there are no recommendations for calculating the mechanical strength and stiffness of pneumatic flexible shaft couplings intended for ball mill drives.…”

Design for a Bi-Planetary Gear Train

“…On basis that the demands correspond to the planetary gear, the kinematic diagram, as shown in Fig. 2, is according to [2,3,9].…”