# 30.104 Dynamics

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This course, particularly relevant for Mechanical, Aerospace and Robotics engineers, focuses on the dynamics of mechanical systems. The topics studied include: kinematics, force-momentum formulation for systems of particles and rigid bodies, work-energy concepts, virtual displacements and virtual work, Lagrange’s equations for systems of particles and rigid bodies, linearization of equations of motion, linear stability analysis, free and forced vibration of linear multi-degree of freedom models of mechanical systems. Emphasis is dedicated to the connection of these topics to realistic engineering problems thanks to “hands-on” and numerical design projects.

#### Goal

The aim of this course is to prepare the student to be able to model, understand and analyze the dynamics of mechanical systems.

#### Learning Objectives

• Using Newton’s law and Lagrange equations, describe and predict the motion experienced by particles, and systems of particles, for a given set of forces and torques in moving reference frames.
• Describe and predict the motion of two-dimensional and three-dimensional rigid bodies.
• Use linear theory to describe the behavior of harmonic oscillators.
• Model, simulate and probe dynamical systems.

#### Measurable Outcomes

• Select and use an appropriate coordinate system to describe particle, and system of particles, motion, including intermediate reference frames, which can be in relative motion (including rotation) with respect to each other.
• Describe the kinematics and dynamics of two- and three-dimensional rigid bodies in translation and rotational motion.
• Identify and exploit situations in which integrated forms of the equations of motion, yielding conservation of momentum and/or energy, can be used.
• Model and analyze simple problems involving vibration with and without damping, including calculation of stability and of the response to forcing.
• Develop governing equations of dynamic systems using Lagrange’s equations.
• Model, simulate, probe, analyze and re-design composite mechanical systems.

#### Pedagogy

Lessons will be conducted in an open environment in which lectures, practicals, labs, demonstrations and problem solving will be naturally blend together. Students will learn by doing and by discussing with each other and with the instructors. We will make significant use of video lectures.

#### Text & References

Applied Mechanics Dynamics, Housner & Hudson 1950.