Aerospace and Electronic Systems Magazine September 2017 - 26

Power by Wire Thrust Vector Control System

Figure 12.

Control performance of a quad redundant PBW system (0.5 Hz square
signal).

Figure 9.

Frequency response performance comparison result.

Figure 13.

Control performance of a quad redundant PBW system (2 Hz sinusoidal
signal).

than a pump control PBW system, and is very close to the valve
control PBW system.
Figures 10 and 11 show the tracking result of system output
pressure to load pressure. Under steady state and low frequency
working conditions, the Δp is only 15-20 bar (10 bar = 1 Mpa).
However, when direction of movement load changes, the instantaneous Δp can reach 80-90 bar for inertial of pump and compression effect of oil.
The simulation results prove that the new PBW system based
on load sensing principle has the best overall performance than
other PBW systems.

Figure 10.

Tracking result of system pressure to load pressure.

SIMULATION RESULTS OF QUAD REDUNDANT PBW
SYSTEM

Figure 11.

Tracking result of system pressure to load pressure (5 Hz sinusoidal
signal).

system has a significant advantage over the valve control PBW
system.
To further study the frequency response performance, the frequency scanning test has been accomplished. The magnitude of
sinusoidal test signal is ±20% full displacement, and the frequency
is gradually increased from 0.1 Hz to 20 Hz. The simulation result
is shown in Figure 9. The simulation result proves that the frequency response performance of a new PBW system is far better

26

To test the tracking performance of a quad redundant system under
normal and fault conditions, the 0.5 Hz square and 2 Hz sinusoidal
signals are used to test the system. The simulation results as shown
in Figures 12 and 13 prove that even when two channels are fault,
the tracking performance of the system will still be acceptable.
Figure 14 is the frequency response performance of the quad
redundant system when the magnitude of sinusoidal test signal is
±20% of full displacement. The bandwidth of the system (-3 dB)
under a quad redundant working condition is 6 Hz, and with degrading of redundancy, the bandwidth will gradually reduce to 5
Hz, 2 Hz, and 1 Hz.

IEEE A&E SYSTEMS MAGAZINE

SEPTEMBER 2017



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