... 11 31- 11 44, ISSN 014 0-3664 Roundy, S. & Wright, P. K. (2004). A piezoelectric vibration based generator for wireless electronics, In: Smart Materials and Structures, Vol .13 , pp. 11 31- 114 2, ... PowerMEMS 2 010 , Leuven, Belgium, December 1- 3, 2 010 Zhu, D. & Beeby, S. (2 011 ). Kinetic energy harvesting, In: Energy Harvesting Systems: Principles, Modeling and Applications, pp. 1- 78, Springer, ... energy Mechanical loss in coupling Electrical loss Sustainable Energy Harvesting Technologies – Past, Present and Future 64 1. 4 .1 Loudspeaker type vibrational generator Figure 9 shows...