Using ADAMS/Engine For Analyzing Crankshaft Loads And Torsion Vibration. 2004-40 Ignacio Manzo, MSc. Author Email: Ignacio.manzo@exatec.itesm.mx Dr. Noel León-Rovira. Co-author Center for Product Design and Innovation, Tel.: +52 81 81582012, Email: noel.leon@itesm.mx Instituto Tecnológico y de Estudios Superiores de Monterey, Mexico. The Monterrey Tech System has developed into an institution recognized — both nationally and internationally — for its academic excellence. Monterrey Tech students are pioneers in the use of Computer Aided Engineering tools. MSC.ADAMS is used at several engineering and graduate courses. MSC.ADAMS has been implemented also in several master program theses to gain a better insight in its different modules. The present paper shows an example of a thesis of the master program Manufacturing Engineering using ADAMS/Engine. During this project, a virtual prototype of an internal combustion engine with four cylinders and 1600 cc was simulated with the objective of analyzing the loads applied on the crankshaft and its dynamic behavior. Starting from the gas forces acting on the pistons, the torsion vibration and the reaction forces of the crankshaft supports were generated. This work was the continuation of a previous master thesis where Working Model 3D had been used to simulate the dynamic behavior of a similar four cylinder engine. However, in that former work the reaction forces and torsion vibrations of the crankshaft could not be simulated. The focus on crankshaft simulation is a first step toward the creation of specific knowledge for supporting local enterprises that manufacture forged crankshafts for car and truck engines. Keywords: ADAMS/Engine, crankshaft engine, torsion vibration, main bearings forces, Introduction At Monterrey Tech System, research work is being held to give support to the local industries. This master thesis has been pioneer in the use of ADAMS/Engine for virtual prototyping and simulation of engines. During the design process, design engineers apply a variety of techniques and scientific principles with the purpose to define a device with enough detail to complete the manufacturing process. During the design process engineers develop new products or innovate the actual one, using tools to facilitate the required analysis, save time and costs and in general to increment the efficiency to reach the target. 3D-CAD parametric modeling has become one of the principal tools during the design process of machinery. Using 3D-CAD tools it is possible to create more complex models in less time and with lower costs, obtaining at the end a virtual geometric model. Fur further analysis, new capabilities are added to the 3D virtual models as multi body systems. ADAMS/Engine is a multi body system that gives the possibility, of adding movement, and analyzing the dynamic behavior of engine models and its components. Scope The main target of this thesis is to analyze the dynamical stresses acting in the crankshaft of four-cylinder inline engine starting from the dynamic torque generated by the gas combustion. The process of building templates in ADAMS/Engine in order to model virtual functional prototypes has been applied in this project. This analysis is then performed