Abstract: An apparatus and a method for diagnosing a failure of an ultrasonic detector in a manner that diagnoses whether a failure has occurred in the ultrasonic detector by determining whether a surge voltage is generated based on a waveform received by a receiver of the ultrasonic detector after activation of a transmitter of the ultrasonic sensor, may include an ultrasonic detector transmitting and receiving an ultrasonic wave; a voltage detector measuring a voltage of the received ultrasonic wave; and a controller determining whether a surge voltage is generated based on the measured voltage, and diagnosing whether a failure has occurred in the ultrasonic detector according to whether the surge voltage is generated.

Abstract: An apparatus and a method for diagnosing a failure of an ultrasonic detector in a manner that diagnoses whether a failure has occurred in the ultrasonic detector by determining whether a surge voltage is generated based on a waveform received by a receiver of the ultrasonic detector after activation of a transmitter of the ultrasonic sensor, may include an ultrasonic detector transmitting and receiving an ultrasonic wave; a voltage detector measuring a voltage of the received ultrasonic wave; and a controller determining whether a surge voltage is generated based on the measured voltage, and diagnosing whether a failure has occurred in the ultrasonic detector according to whether the surge voltage is generated.

Abstract: Disclosed is an active energy harvesting device. The device includes a rigid body configured to vibrate corresponding to vibration of an external vibration body and including a first end at which an energy harvesting structure is provided to convert mechanical energy into electric energy, a magneto-rheological material provided at a second end of the rigid body to be bound to the rigid body and including a material which is changed in elastic force according to the surrounding magnetic field strength, a fixing unit for binding the second end of the rigid body and the magneto-rheological material and connecting the rigid body to the external vibration body, and a first permanent magnet arranged symmetrically apart from the magneto-rheological material while interposing the magneto-rheological material therebetween and provided so as to adjust a gap from the magneto-rheological material and change an elastic coefficient of the magneto-rheological material according to the gap.

Abstract: Disclosed is an active energy harvesting device. The device includes a rigid body configured to vibrate corresponding to vibration of an external vibration body and including a first end at which an energy harvesting structure is provided to convert mechanical energy into electric energy, a magneto-rheological material provided at a second end of the rigid body to be bound to the rigid body and including a material which is changed in elastic force according to the surrounding magnetic field strength, a fixing unit for binding the second end of the rigid body and the magneto-rheological material and connecting the rigid body to the external vibration body, and a first permanent magnet arranged symmetrically apart from the magneto-rheological material while interposing the magneto-rheological material therebetween and provided so as to adjust a gap from the magneto-rheological material and change an elastic coefficient of the magneto-rheological material according to the gap.