By Wodek Gawronski
The booklet provides and integrates the tools of structural dynamics, indentification and keep watch over right into a universal framework. It goals to create a typical language among structural and regulate procedure engineers.
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Additional info for Advanced Structural Dynamics & Active Control of Structures
6. We used the finite-element model of the antenna to solve this problem. The modes are shown in Fig. 4. 3 rad/s. 5. The Matlab code for this example is in Appendix B. For the simple system from Fig. 1 determine the natural frequencies and modes, the system transfer function, and transfer functions of each mode. Also determine the system impulse response and the impulse responses of each mode. 01ki , i = 1, 2, 3, 4. There is a single input force at mass 3 and a single output: velocity of mass 1.
2. Modes of a simple system: For each mode the mass displacements are sinusoidal and have the same frequency, and the displacements are shown at their extreme values (see the equation (a)). 3. Determine the first four natural modes and frequencies of the beam presented in Fig. 5. Using the finite-element model we find the modes, which are shown in Fig. 3. 7 rad/s. mode 4 displacement, y-dir. 3. Beam modes: For each mode the beam displacements are sinusoidal and have the same frequency, and the displacements are shown at their extreme values.
2. Determine the rigid-body modes of the Deep Space Network antenna. The antenna has actually two rigid-body modes: rigid-body rotation with respect to the azimuth (vertical) axis, and rigid-body rotation with respect to the elevation (horizontal) axis. 2 shows the azimuth rigid-body mode. 2(a) presents the initial position from the side view, Fig. 2(b) presents the modal displacement (rigid-body rotation with respect to the azimuth axis) from the side view, Fig. 2(c) presents the initial position from the top view, and Fig.
Advanced Structural Dynamics & Active Control of Structures by Wodek Gawronski