Determination of Weak Knock Characteristics for Two-Stroke Spark Ignition UAV Engines Based on Mallat Decomposition Algorithm

Figure 14

Time-domain diagram of the cylinder pressure signal and the engine vibration signal collected synchronously at 5000 rpm when the ignition advance angle is 27°CA. (a) Time-domain diagram of the cylinder pressure signal. (b) Time-domain diagram of the engine vibration signal.

(a)

(b)