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. Author manuscript; available in PMC: 2021 Mar 29.
Published in final edited form as: Biomed Mater Eng. 2021;32(1):1–14. doi: 10.3233/BME-201132

Figure 3:

Figure 3:

Calibration of the frictional loss of the drop tower system. (A) Impact velocity (v) as a function of the drop height (h). (B) Kinetic energy loss of the system (∆E) as a function of drop height (h). (C) Relative kinetic energy loss (δ) of the system as a function of drop height (h). ANSI Z89.1 standards requires the tests to be performed at a impact velocity of 5.5 m/s just before the impactor contact the helmet, which is equivalent to a drop height of 1.73 m for the current drop tower system.