The experimental study of Cam plate damage detection on VE-type distributor injection pump by using sound signal

The injection pump is one of the main components of the diesel fuel system. Because of its critical function, It must be ensured that the injection pump runs its function properly. Some methods have been investigated to find a better and more convenient way to detect the damages. Vibration measurement is one of the methods that are frequently used to detect damages in the injection pump. The weakness of the vibration measurement method is that the sensor must be attached to the test object. This condition may endanger the measurement operator, and the vibration sensors and analyzer are high cost. In this study, the simple microphone as a non-contact sensor is used to detect damage in the cam plate of the VE-Type injection pump by using the sound signal. The artificial damages were applied to the cam plate of the injection pump. For data sampling, a microphone as a transducer, data acquisition, and a personal computer is used to grab the sound signal. The signals are then processed by using Fast Fourier Transform (FFT), and wavelet transform-scalogram are methods used to detect damage to the cam plate. The experiment is conducted on the test bench machine. The result shows that the sound signal at the injection pump can provide information regarding its state. The damage in the cam plate can be detected from the characteristics of the resulting sound signal.