Lysenko V. Computer integrated system for fuel gas supply to marine diesel generator with a help of piezoelectric transducers

Dissertation research is dedicated to solve actual scientific task – increasing operability of computer integrated fuel gas supply system for marine diesel generator that is equipped with gas injection valves with electromagnetic actuators. Assumption is to replace an electromagnetic actuator with piezoelectric converters. A number of regularities were observed as a result of research performed by the author. Analysis of such regularities helps us to make a conclusion that goals of the dissertation research were reached. Correct and reliable methods were used in the research. Analysis of the modern condition of the marine diesel generator computer integrated fuel gas supply system through piezoelectric actuators on the LNG vessels shows us that the most critical element of such system is gas admission valve with electromagnetic actuator. Types of actuators available nowadays cannot be used to increase reliability of the computer integrated system because electromagnetic actuator is also part of that system. Known piezoelectric actuators solutions cannot be used with marine dual fuel diesel engine. There are solutions in automotive industry that inspired us to search for appropriate piezoelectric actuators solution for marine diesel engines. We suggest to implement marine dual fuel diesel generator gas admission valve based on piezoelectric stacks and linear piezoelectric actuators. The models of piezoelectric layer and friction block as parts of piezoelectric stacks and linear piezoelectric actuators were further developed. This allowed us to achieve required force and transient time. Modelling allowed us to calculate and evaluate basic piezoceramic properties. During modelling it was found out that the system has oscillatory nature. In order to decrease piezoelectric actuator oscillations PID and fuzzy logic governors can be used. We proposed new kinematic schemes of gas admission valves. The models of piezoelectric layer and friction block as parts of piezoelectric stack pillars and linear piezoelectric actuators were further developed. This helped us to complete mathematical and mechanical modelling. Piezoelectric layers and linear piezoelectric actuator components library was created. The new designs of gas admission valve with piezo stacks actuators and linear piezoelectric actuators were created based on theoretical researches. Experimental researches were also performed. As a result of hardware and software researches a model of computer integrated fuel gas supply system of the emergency diesel generator was created. This model consists of hydrogen generation system HYPO 3.0, emergency diesel generator PowerTec 4045 DFM 70 (based on emergency diesel generator John Deer 4045 d, PLC ILC 150 GSM/GPRS) and piezoelectric actuator LPM-5. Such researches confirmed implementation possibility of piezoelectric actuators in gas admission valves. Research results credibility was confirmed during electronic modelling in SimInTech software (unlimited license of National university “Odesa maritime academy” #D63B30FDA70). Implementation of the dissertation research results in the educational process of the National University "Odessa Maritime Academy" by the following departments: Automation of Ships’ Diesel and Gas Turbine Plants; Fleet Operation and Maintenance.