Answer Happy

AUTOMOTIVE DESIGN
Design a cross section geometry of connecting rod with an "I" shape for an engine based on information in Table 2. Assume that the length to diameter ratio for big end bearing as 1.33 and small end bearing as 2.00 and the corresponding bearing pressures as 10 N/mm² and 15 N/mm² respectively. Use the factor of safety of 5 for the design. The allowable stress in the bolts is 60 N/mm² and in cap is 80 N/mm². a) Discuss your own proportions for the relation between flange and web thickness, width of the section and height of the section. b) Examine the resistance of the selected proportion for buckling failure in x-x axis and y-y axis by using the moment of inertia method. Table 2: Engine information for connecting rod design Values 1800 190 3.10 100 c) Use the Rankine formula for which the numerator constant, o may be taken as 320 N/mm² and the denominator constant, a as 1/7500 to complete the connecting rod design process. Specification Engine speed, N (rpm) Cylinder stroke, S (mm) Maximum cylinder gas pressure, p (N/mm²) Diameter of the piston, D, (mm) Mass of reciprocating parts, mec (kg) Crank radius, r (mm) Connecting rod length, I, (mm) Compression ratio, re Density of rod material, p (kg/m³) (3 Marks) [CO2, PO2, C5] 2.20 60 380 6:1 8000 (6 Marks) [CO2, PO2, C5] (16 Marks) [CO2, PO2, C5]