12: Vibration Modes of Undamped Mechanical Systems with Two Degrees of Freedom Last updated Save as PDF Page ID7704 Contributed by William L. Hallauer Jr.Adjunct Professor (Aerospace and Ocean Engineering) at Virginia Polytechnic Institute and State UniversitySourced from Virginia Tech Libraries' Open Education Initiative 12.1: Undamped Mass-Spring System12.2: Undamped Two-Mass-Two-Spring System12.3: Vibration Modes of an Undamped Typical Model of a WingVibration modes of an undamped 2-DOF typical-section model of a wing12.4: Chapter 12 Homework