design. The transmission ratio is the characteristic parameter of the
manipulating mechanism, which depends on the equivalent force arm of the
mechanism. Equivalent force arm can adjust the transmission ratio of
manipulating mechanism and change the distribution relationship between
moment and speed. Once the equivalent force arm is determined, the
steering stroke and the deviation angle of the control surface, the steering
thrust and the steering moment of the control surface, and the transmission
Steering engine characteristic curve
(maximum control current)
Rudder shaft speed (° )
Maximum power point
Load characteristic curve
Manipulating
moment
Load moment
Fig. 9.14 Matching of output characteristics and load characteristics of steering engine
Rudder deflection angle
Required value
Actual value
Amplitude
gain
Phase lag
Frequency
Steering gear stroke
(a)
(b)
Fig. 9.15 Characteristic of steering gear manipulating mechanism. a Static characteristics;
b dynamic characteristics
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9 High-Temperature and High-Speed Gas Turbine Pump …