Comprehensive System Identification of Ducted Fan UAVs - Cal Poly

Table 3.22 shows that for the first actuator tested, the same 100% sweep at 5Vwas applied. The NAVFIT results for these same sweeps show nearly identical results.This was done to ensure repeatability and consistency of the test. The frequencyresponses and the transfer function fits are presented by CIFER name (referenced inTable 3.22) in Appendix C.As Table 3.22 shows, in general, all the actuators running the sweep to only 50%instead of the full 100% yielded a noticeably higher natural frequency and higherdamping ratio. This is because the smaller deflections allow the actuator to reach higherfrequencies before the rate limit is reached. This is evident in the frequency responses forall the actuators as illustrated for the HS512MG in Figure 3.23.- 69 -