Abstract
Radial turbine and compressor wheels form essential cornerstones of modern internal combustion engines in terms of economy, efficiency and, in particular, environmental compatibility. As a result of the introduction of exhaust gas turbochargers in the extremely important global market for diesel engines, higher engine efficiencies are possible, which in turn reduce fuel consumption. The associated reduced exhaust emissions can answer questions that results from environmentally relevant aspects of the engine development. In shipping, the international Maritime Organisation (IMO) prescribes the step-by-step reduction of nitrogen oxide and other types of emissions. To reduce these emissions, various systems are being developed, in which turbochargers are an important part. The requirements for the reliability and service life of turbochargers are constantly increasing. Turbocharger blade vibration is one of the most important problems to be solved when designing the rotors. In the case of real rotors, so-called mistuning arises, which is a slight deviation of the properties of the individual blades from the design parameters. The article deals with an effective method of mistuning identification for cases of integrated bladed discs of marine engine turbochargers. Unlike approaches that use costly scanning laser Doppler vibrometers, this method is based on using only a simple laser vibrometer in combination with a computational model of the integrated bladed disc. The added value of this method is, in particular, a significant reduction in the cost of laboratory equipment and a reduction in the time required to obtain the results.
Highlights
The principle of operation of the exhaust gas turbocharger is to use the unused kinetic and thermal energy of the ejected engine exhaust
The article deals with an effective method of mistuning identification for cases of integrated bladed discs of marine engine turbochargers
A marine engine turbocharger rotor was selected as the subject of the research
Summary
The principle of operation of the exhaust gas turbocharger is to use the unused kinetic and thermal energy of the ejected engine exhaust. The tip-timing method was used to find the mistuned bladed disc modes and frequencies Based on this situation, a marine engine turbocharger rotor was selected as the subject of the research (see Figure 1). The aim of the solution was to identify mistuning of produced turbine rotor of a marine engine turbocharger and to design an effective experimental method for this purpose. Some authors used a laser scanning system to obtain the modal information for different types of mechanical structures [24,25,26,27] In this system, a vibration response against the excitation input is obtained at each reference point using a laser Doppler vibrometer. After completion of the scan, the frequency response functions obtained for all reference points are correlated and the modal displacement contour of the entire measured surface is created. Order to achieve the best possible correlation, no boundary conditions are specified for the computational modal analysis
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