Download Engineering Dynamics: From the Lagrangian to Simulation by Roger F. Gans PDF

By Roger F. Gans

This engineering dynamics textbook is aimed toward starting graduate scholars in mechanical engineering and different similar engineering disciplines who desire education in dynamics as utilized to engineering mechanisms. It introduces the formal mathematical improvement of Lagrangian mechanics (and its corollaries), whereas fixing quite a few engineering purposes. The author’s objective is to instill an realizing of the fundamental physics required for engineering dynamics, whereas supplying a recipe (algorithm) for the simulation of engineering mechanisms akin to robots. The ebook should be kind of self-contained in order that the practising engineer drawn to this zone may also utilize it. This publication is made obtainable to the widest attainable viewers by means of a variety of, solved examples and diagrams that practice the foundations to genuine engineering applications.

• presents an utilized textbook for intermediate/advanced engineering dynamics courses;
• Discusses Lagrangian mechanics within the context of diverse engineering applications;
• comprises quite a few, solved examples, illustrative diagrams and utilized workouts in each chapter

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Extra resources for Engineering Dynamics: From the Lagrangian to Simulation

Example text

One can model these using only what we have so far by supposing the car and the load to be point masses and the hoist cable to be a massless rigid rod. 7 shows the model. The horizontal coordinate is y and the vertical coordinate is z. The position of the load mass is given by y ¼ l sin θ; z ¼ Àl cos θ (P) with respect to an inertial system centered at the junction of the cable and the car. I denote the length of the cable by l. The Lagrangian of this system can be found by using Eq. P to eliminate the Cartesian coordinates of the load in favor of θ.

Rx(π/2) carries the same set to –k, i, Àj. 2 summarize the transformations between body and inertial coordinates for the z-x-z Euler transformation. Each triplet entry shows the result after each successive rotation. 1 to Eq. 19). 2 shows the inverse, the inertial frame in terms of the body coordinates. 2 The Euler rotations: inertial axes in the body frame i j k i j k i j k i j k i0 j0 k0 i1 j1 k1 i2 j2 k2 i3 j3 k3 I J K cos ϕI À sin ϕJ sin ϕI þ cos ϕJ K cos ϕI À cos θ sin ϕJ þ sin θ sin ϕK sin ϕI þ cos θ cos ϕJ À sin θ cos ϕK sin θJ þ cos θK ðcos ψ cos φ À cos θ sin ϕ sin ψ ÞI þ ðÀcos θ cos ψ sin φ À cos ϕ sin ψ ÞJ þ sin θ sin ϕK ðcos ψ sin φ þ cos θ cos ϕ sin ψ ÞI þ ðÀsin ψ sin φ þ cos θ cos ϕ cos ψ ÞJ À sin θ cos ϕK sin θ sin ψI þ sin θ cos ψJ þ cos θK Placing Axes The aim of the text is to develop methods for analyzing mechanisms by building mathematical models of them.

Rotation about K is given by ψ. K ¼ cosθ. 2 These conventions will be very useful in the study of robot motion. I will call the set of Euler angles the Euler triad. It will also be useful to have a notation for the Euler triad. I will use Φ ¼ {ϕ, θ, ψ}, and I will adopt the convention that {0, 0, 0} corresponds to I ¼ i, J ¼ j, K ¼ k. I leave it to the reader to work out the Euler triad for other common orientations, such as I ¼ Àk, J ¼ j, K ¼ i for which the Euler triad is equal to {π/2, Àπ/2, Àπ/2} (show this).

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