Abstract
Currently, great emphasis on reducing energy consumption and harmful emissions of internal combustion engines is placed. Current control technology allows us to customize the operating mode according to the currently required output parameters, while the tuning of mechanical systems in terms of torsional vibration is often ignored. This article deals with a semi-active torsional vibroisolation system using pneumatic flexible shaft coupling with constant twist angle control. This system is suitable, as it is specially designed, for the tuning of mechanical systems where the load torque has fan characteristics (fans, ship propellers, pumps). The main goal of this research is to verify the ability of an electronic control system developed by us to maintain the pre-set constant twist angle of the used pneumatic flexible shaft coupling during operation. The constant twist angle control function was tested on a laboratory torsional oscillating mechanical system. Presented results show that the proposed electronic control system meets the requirements for its function, namely that it can achieve, sufficiently accurately and quickly, the desired constant twist angle of the pneumatic flexible shaft coupling. It is possible to assume that the presented system will increase the technical level of the equipment where it will be applied.
Highlights
Nowadays, reducing energy consumption and harmful emissions of internal combustion engines is a very important issue addressed by both research institutions and manufacturers of internal combustion engines
The main goal of this research is to verify the ability of an electronic constant twist angle control system (ECTACS), developed by us, to maintain a pre-set constant twist angle of the used pneumatic flexible shaft coupling during operation of an experimental torsional oscillating mechanical system (TOMS) in laboratory conditions
As the focus is placed on verifying the ability of our ECTACS to maintain a defined constant value φconst of the pneumatic tuner of torsional oscillations (PTTO)’s twist angle static component, and torsional vibration in the TOMS does not directly affect the process of twist angle control, only the static component Mstat of the load torque transmitted by the PTTO is shown in the presented results
Summary
Nowadays, reducing energy consumption and harmful emissions of internal combustion engines is a very important issue addressed by both research institutions and manufacturers of internal combustion engines. Development of control technology allows us to customize the operating mode of the device according to the currently required output parameters, while often the tuning of mechanical systems in terms of torsional vibration is ignored [1,2,3,4,5,6]. Tuning current mechanical drives in terms of torsional vibration by conventional (passive) vibroisolation methods is increasingly problematic. This is mainly due to operation in a wide range of speeds, uneven operation cylinders (deactivated cylinders, uneven fuel supply to the cylinders) and the increased value of excitation amplitudes
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