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

Figure 19

The energy percentage of 8 signal components. (a) The energy percentage of the 8 signal components obtained from the decomposition of the engine vibration signal at 5000 rpm with an ignition advance angle of 25°CA. (b) The energy percentage of the 8 signal components obtained from the decomposition of the engine vibration signal at 5000 rpm with an ignition advance angle of 27°CA.

(a)

(b)