Electronic Constant Twist Angle Control System Suitable for Torsional Vibration Tuning of Propulsion Systems

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.

Numerical Model to Analyze the Physicochemical Mechanisms Involved in CO2 Absorption by an Aqueous Ammonia Droplet

“…Moreover, resources are widely distributed. Another advantage is that ammonia can also reduce other pollutants, including SO 2 and NO x [12][13][14][15][16].…”

“…Figure16. Absorbed carbon by a droplet for several initial liquid temperatures; 5% initial ammonia concentration, 100 • C initial gas temperature, and 1000 µm initial diameter.…”

Marine Engines Performance and Emissions

“…These papers were developed by 39 authors from The Netherlands, Finland, Sweden, Korea, Slovakia, China, Chile, Ukraine, Poland, and Spain. Most papers discuss emissions from marine engines [1][2][3][4][5][6][7][8][9], and others discuss performance, such as control technology [10], and turbocharger compression [11,12]. Puškár et al [1] and Sui et al [2] analyzed alternative fuels.…”

“…Lehtoranta et al [8] analyzed a methane oxidation catalyst for LNG (Liquefied Natural Gas) ships. Lamas et al [10] analyzed the injection system. Homišin et al [10] analyzed an electronic constant twist angle control system suitable for torsional vibration tuning of propulsion systems.…”

“…Lamas et al [10] analyzed the injection system. Homišin et al [10] analyzed an electronic constant twist angle control system suitable for torsional vibration tuning of propulsion systems. Shen et al [11] developed a marine two-stroke diesel engine MVEM (Mean Value Engine Model) with in-cylinder pressure trace predictive capability and a novel compressor model.…”