Experimental Modal Analysis and Numerical Model Development of Diesel Engine Block

Evaluating structure-borne noise contribution of various engine components is critical to predict the total engine radiated noise. This paper covers the experiment modal test and numerical model development for the three cylinder engine block. Experimental modal test were conducted at a new test facility in Pune, India. Finite Element Model was developed to predict the vibration characteristics of the engine block. Finite Element Model was utilized to choose the excitation and response locations for successful correlation. Modal Assurance Criteria (MAC) was used to confirm the accuracy of Finite Element Model compared to the experimental model test. Comparison of Frequency Response Function (FRF) between Finite Element Modal and experimental modal test were also discussed. Finite Element Model results shows very good agreement with test result. We plan to continue this work by adding more components to understand the vibration behavior of the sub-assembly and eventually entire engine assembly and successfully predict the structure-borne noise.