Modal Analysis of a BattleBot Blade

In this chapter, the dynamic characteristics of a BattleBot blade is studied. To optimize the design and improve the structural behavior of a test object, modal analysis is a crucial process. Obtaining modal parameters, namely, the natural frequencies, damping, and mode shapes of the unit under test, facilitates in adjusting the dynamic properties and in improving performance. In this case, a heavyweight BattleBot blade that is designed for combat competitions is tested and analyzed. The results are further used to tweak the design of the BattleBot to make it more resistant to damage or breaking of crucial components. Furthermore, these dimensional changes can also help improve the impact force of the BattleBot’s blades when it strikes the opponent. Using a new material for the fabrication can also assist in making the robot lighter and stiffer. Hence, a modal test can help make the BattleBot more efficient for the competitions. This work focuses on the experimental setup and discusses the workflow of modal analysis of the BattleBot blade. A modal hammer is used to excite the blade and a uni-axial accelerometer is used to obtain the vibration characteristics. The short pulse induced with a modal hammer excites a wide range of frequencies. To avoid the mass loading effect that is induced with a roving response measurement, the modal test is carried out with a roving excitation method. The test measurements and results are presented in this chapter.