Fatigue Life Calculation of SUV Engine Rubber Mount

The present study is a methodology to predict the fatigue life of an engine rubber Mount of sports utility vehicles using stress – life approach. As an important vibration isolation component widely used in vehicles, rubber mounts have two functions; one is support the static load, the other is provide a dual damping mode passive vibration isolator to control high-amplitude, low-frequency road-induced vibrations and low- amplitude, high-frequency engine-induced vibrations and improve the comfort in riding. To improve the performance of the Engine rubber mount series of design iterations was carried out by taking the account of base model structure. Normal modal analysis for base model is carried out to find out the first natural frequency. Normal modal analysis was carried for all design iteration to improve the first natural frequency of the engine rubber mount. Eigen values of all design variants are calculated theoretical and compared with numerical analysis results. Static analysis is carried out for all modified designs to find out Max displacement and Von misses stress at critical location, Maximum principal stress and Minimum Principle stresses are evaluate for Fatigue analysis. Fatigue analysis(S-N approach) is carried out under static condition by considering all possible events likely, smooth road, left cornering, rough road, right cornering, and Braking. For these loading conditions fatigue calculations carried by theoretically for Base design and comparing with all modified designs. By observing all Modified designs, modified design type 3 is the suggested model by taking account of Normal modal analysis, static analysis and Fatigue calculation.