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The single cylinder engines are extensively used in agricultural areas for several purposes such as water pumping, harvesting machines, spraying of pesticides etc. The use of diesel as fuel and having only one cylinder makes them an economic alternative due to their low investment cost and limited fuel consumption. Therefore these engines are important auxiliary agricultural tool for rural areas. Because of excessive usage and overloading in field applications more failures are reported on different engine components. Crankcase is located at the bottom of the cylinder block. It can be molded as a part of a block or bolted on separately. . The failure investigation includes visual inspection, chemical composition analysis, microstructure examination, hardness determination, static analysis as well as dynamic analysis (modal and harmonic analysis). In this paper, failure investigation has been conducted on crankcase of single cylinder high speed diesel engine by modal analysis. Modal analysis determines the vibration characteristics (natural frequency and mode shape) of crankcase. Keyword Crankcase, Modal Analysis, Natural frequency, Mode shape. Modal Analysis Of Crankcase For Single Cylinder High Speed Diesel Engine 056 Expand the modes. Review the results. In certain cases, especially if the model has of a large number of degrees of freedom, it is advantageous to define Master Degrees of Freedom (MDOF). This procedure condenses the full matrices describing the structure into a smaller size, thus reducing the computational cost significantly. The only boundary conditions that are permissible in modal analysis are zero displacements. Any constraints/loads that are non-zero are ignored in the analysis. Once the modal analysis is complete, the solution is expanded to find results related to the complete structure—not just the MDOF. The results include natural frequencies, mode shapes, and corresponding parametric (relative) stress fields. 3. MODAL ANALYSIS OF CRANKCASE FOR SINGLE CYLINDER HIGH SPEED DIESEL ENGINE First, I have Prepared Assembly in CATIA for crankcase of single cylinder diesel engine and Save as this part as IGES for Exporting into ANSYS Workbench Environment as shown in figure 1. Import IGES Model in ANSYS Workbench Simulation Module Apply Material for Crankcase (FG260 Gray cast iron). Material Details: Material Type: Gray cast iron Designation : FG260 Modulus of Elasticity: 128520N/mm 2 . Ultimate tensile strength (Mpa):850 Elongation (%):13 Poisson ratio: 0.26 Figure 1: Crankcase of single cylinder diesel engine in ANSYS. Mesh the existing model of Crankcase of single cylinder four stroke diesel engine as shown in figure 2. Mesh Statics: Type of Element: Tetrahedrons (10 Noded) Number of Nodes: 469434. Number of Elements: 270070 G.A.Bhosale & B.D.Sawant 057 Figure2: Meshed existing Model of Crankcase of a single cylinder diesel engine. 4. MODAL ANALYSIS OF EXISTING MODEL OF SINGLE CYLINDER CRANKCASE. Table 1 – The first six model parameters of model of crankcase. Figure 3 -Mode shape of crankcase for first frequency 485.99 Hz No of Modes Natural Frequency(Hz) Types of modes 1 485.99 Bending 2 682.28 Bending 3 1044.7 Bending 4 1210.4 Bending 5 1662.1 Torsion 6 1857.6 Bending. Modal Analysis Of Crankcase For Single Cylinder High Speed Diesel Engine 058 Figure 4 -Mode shape of crankcase for second frequency 682.28 Hz Figure 5. -Mode shape of crankcase for third frequency 1044.7 Hz. G.A.Bhosale & B.D.Sawant 059 Figure 6 -Mode shape of crankcase for forth frequency 1210.4Hz Figure 7 -Mode shape of crankcase for Fifth frequency 1662.1Hz Modal Analysis Of Crankcase For Single Cylinder High Speed Diesel Engine 060 Figure 8 -Mode shape of crankcase for sixth frequency 1857.6 Hz. 5. CONCLUSION. Because of crankshaft has rotational movement torsion mode are much more important than the bending moment .As it mentioned only 5 th mode is torsion mode and so it is important. Natural frequency of fourth mode in this state 1662.1 Hz and lowest rotational speed is 24931.5 rpm. Maximum rotational speed of single cylinder four stroke diesel engines is 2600 rpm. So it is quite clear that the crankcase has no resonances phenomenon (no resonance occurs). 6. REFERENCES: [1] Practical engineering failure analysis by Hani M. Tawancy, Anwar UL-Hamid. [2] The Finite Element Method and Application in Engineering Using ANSYS by Erdogan Madenci, Ibrahim Guven. [3] R. K. Pandey, ―Failure of diesel-engine crankshafts‖, Engineering Failure Analysis, 10(2003) 165-175. [4] Mosoud Mohammadi, 2012, ―Modal analysis of crankshaft of samand Engine,‖ Journal of applied science research (3304-3307). [5] C. Azoury, 2012, ―Experimental and Analytical analysis of a crankshaft,‖ ISRO Journal of engineering, vol-2, (674-684). [6] Jian meng, 2011, ―Finite Element Analysis of 4 cylinder Diesel Engine,‖ I J Image, graphic and signal processing (22-29), vol-5. [7] Jian Meng., Yongqi Liu., Ruixiang Liu., 2011, ―Finite Element Analysis of 4-Cylinder Diesel Crankshaft,‖ I.J. Image, Graphics and Signal Processing, 5, 22-29. Appendix A: Natural frequency of crankcase of four stroke diesel engine by using critical Speed equation. No of mode Natural Frequency Types of Mode ω Critical q=1/2 ω Critical (rpm) q=1 ω Critical q= 1 1/2 ω Critical q=2 ω Critical q=3 ω Critical q=4 1 485.99 Hz Bending 58200. 29159.4 19439.6 14579.7 9719.66 7289.85 2 682.28 Hz Bending 81873.6 90936.8 27291.2 20468.4 13645.6 10234.2 3 1044.7 Hz Bending 125364. 62682. 41788. 31341. 20894. 15670.5 4 1210.4Hz Bending 145200. 72600. 48400. 36300. 24200. 18150. 5 1662.1 Hz Torsion 199452. 99726. 66484. 49863. 33242. 24931.5 6 1857.6 Hz Bending 222912. 111456. 74304. 55728. 37152. 27864.

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Modal analysis of crankcase for single cylinder high speed diesel engine. The single cylinder engines are extensively used in agricultural areas for several purposes such as water pumping, harvesting machines, spraying of pesticides etc. The use of diesel as fuel and having only one cylinder makes them an economic alternative due to their low investment cost and limited fuel consumption. Therefore these engines are important auxiliary agricultural tool for rural areas. Because of excessive …