Parametric Optimization of Thermoelastic Energy Harvesting Systems under Low-Grade Thermal Cycling

Online Journal of Engineering Sciences | Vol 5, Issue 1

Figure 8

Effect of the load-transfer parameter λ on the maximum achievable average mechanical power and the corresponding optimal rod geometry. (a) Maximum average power as a function of λ, showing the numerical optimum at λ<sub>opt</sub> = 0.473 with P<sub>max</sub> = 0.170454 W and the reference case λ = 0.500, for which P<sub>max</sub> = 0.166245 W. (b) Corresponding optimal rod diameter D<sub>opt</sub> and length L<sub>opt</sub> over the investigated λ range. The optimal diameter remains at the upper design bound of 150 mm, whereas the optimal length decreases as the buckling constraint becomes increasingly restrictive.

Figure 8. Effect of the load-transfer parameter λ on the maximum achievable average mechanical power and the corresponding optimal rod geometry. (a) Maximum average power as a function of λ, showing the numerical optimum at λ_opt = 0.473 with P_max = 0.170454 W and the reference case λ = 0.500, for which P_max = 0.166245 W. (b) Corresponding optimal rod diameter D_opt and length L_opt over the investigated λ range. The optimal diameter remains at the upper design bound of 150 mm, whereas the optimal length decreases as the buckling constraint becomes increasingly restrictive.