Vibration Reduction of Single Cylinder Diesel Engine used for Agricultural Water Pumping

摘要

There are many environmental issues in India. Air pollution, water pollution, garbage, vibration, noise pollution and pollution of the natural environment are all challenges for India. India has a long way to go to reach environmental quality similar to those enjoyed in developed economies. Pollution remains a major challenge and opportunity for India. The review of trends in farm practices and machinery development suggests that vibration & noise problems are still prevalent in agricultural situations, even though there has been a steady increase in the availability of materials and equipment for vibration & noise control over recent years. Diesel engine is the main source of power for agricultural equipments, such as water pump set, compressor, electric generator and tractor. Even it is one of the sources of vibration & noise in agricultural field. There is reluctance of the agricultural sector to use of vibration & noise control methods. It is difficult to estimate the number of workers (self-employed and employees) in agriculture and forestry who suffer in India. In this project work, the challenge was to predict vibration performance / characteristics of 8 HP, 2100 rpm, single cylinder diesel engine. Also check the effect of up-gradation of same engine to 2600 rpm; which will be done to get more water quantity and at higher level /head. Engine model building was started with 3D CAD modeling using Pro/E software then discritization (Meshing) and Nastran solver deck / model with loads and boundary conditions was developed using Hyper Mesh software. Engine loads was calculated using analytical methods for 2100 rpm & 2600 rpm. Those excitation loads was used to simulate NVH behavior of engine using CAE method. Detailed vibration source identification was carried out by actual vibration measurement using B & K measuring system and NVH CAE simulation methods. Fuel tank and gear cover was potential candidate of vibration. Based on vibration source identification by both methods, design modifications were done and verified using NVHCAE simulation technique for 2100 rpm and 2600 rpm before final recommendation for design changes. Those modifications were showing good amount of vibration reduction for the respective natural frequencies as design changes were strengthening the plane surfaces of sheet metal fuel tank and gear cover. Design modifications were recommended to implement after prototype testing.