This paper presents an analysis of the energy generating performance in a pressure-loadedsystem using piezoelectric transducer technology. The energy harvesting device in thisstudy is a partially covered, simply supported piezoelectric unimorph circular plate toconvert energy from fluctuating pressure into electrical energy. The analysis includescomprehensive modeling and a parametric study to provide a design primer for a specificapplication in which the frequency of fluctuating pressure is well below the naturalfrequency of the harvester. An expression for the total power output from the device for agiven applied pressure is shown, and then used to determine optimal design parameters. Itis shown that the device’s deflection and stress under load are the limiting factors in thedesign. The analytical results indicate that the PMN–PT harvesters can generate over oneorder of magnitude more power than the PZT harvesters for any substrate material. Somepossible factors that can degrade energy harvesting performance are also discussed.