The structures of sensors in plantar force measurement systems can be divided into four kinds, including monolayered sensor, multilayered sensor, tri-axial sensor and other sensor. The review introduces working principle of piezoelectric sensor, structures and hardware design of plantar force measurement systems based on piezoelectric materials. This paper aims to review plantar force measurement technologies based on piezoelectric materials, which can make the reader understand preliminary works systematically and provide convenience for researchers to further study. Plantar force derived from gait and posture plays a critical role for rehabilitation, footwear design, clinical diagnostics and sports activities, and so on. Plantar force is the interface pressure existing between the foot plantar surface and the shoe sole during static or dynamic gait. It ensures efficiency, accuracy, easy access to data and remote control, which significantly reduces human intervention. The combination of vibration analysis, thermal signature analysis and artificial neural network provides a better diagnosis. Besides, a Kalman filter is employed to predict the vibrations while eliminating the noise. The diagnosis of the motor condition is realized using an artificial neural network algorithm implemented on the microcontroller. The data is transmitted via Wi-Fi to a monitoring station that intervenes to detect an anomaly. Moreover an infrared thermopile was used for non-contact temperature measurement. A new bio-flexible piezoelectric sensor developed previously in our laboratory, was used for vibration analysis. In this regard, two non-invasive measurements have been collected then monitored in real time and transmitted via an ESP32 board. This paper presents a design of a low-cost integrated system for the preventive detection of unbalance faults in an induction motor.
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