نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی مکانیک، دانشگاه یاسوج، یاسوج، ایران
2 گروه مهندسی مکانیک بیوسیستم، دانشگاه شهرکرد، شهرکرد، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Recently, converting ambient vibrational energy into useful electric energy through energy harvesters has been attracted worldwide attention due to its application in realizing self-powered operation of wireless sensors. Piezoelectric energy harvesters are usually equipped with elastic stoppers to prevent damage to the piezoelectric layer when the oscillating structure is attacked by sudden overloads. However, elastic stoppers cause nonlinear piecewise forces, which can lead to irregular voltage response of the system. So, in this paper, the resistive load is used as the control parameter to increase range of periodic voltage and avoid the appearance of irregular response of a bi-directional piezoelectric vibration energy harvester with the elastic stoppers. The governing electromechanical equations are extracted and solved by the Runge–Kutta method. The nonlinear dynamic response is analyzed using bifurcation plot, phase plane, power spectrum plot and Poincaré map. In order to validate simulation results, experiments have been carried out. Various nonlinear behaviors such as multi periodic and chaotic responses are observed, which are affected by the resistive load. Also, the results show that a higher value of resistive load can lead to a wider range of periodic responses of the system. The results of this study can provide a methodology to optimize system parameters according to vibration conditions of different environments.
کلیدواژهها [English]
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