Wideband linear quadratic control of a gyro-stabilized electro-optical sight system

Bigley, William J.; Rizzo, Vincent

doi:10.1109/mcs.1987.1105331

Cited by 20 publications

(4 citation statements)

References 2 publications

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“…The velocity control bandwidth and responsiveness of servo systems are greatly limited by the anti-resonance and resonance frequencies appearing in the motor angular velocity output to the motor torque input, [1,2]. The anti-resonance frequency is defined as the servo system's velocity control bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…In order to expand the bandwidth without increasing the weight of the system, the optimal control or state equalization control techniques were used to minimize or eliminate the effects of the anti-resonance frequency on the servo system, [1,2,6,7]. However, the optimal control technique requires precise modeling, and the state equalization control technique needs very large motor output when the moment of inertia of the load is large, making it difficult to manufacture the system.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, servo systems with gear reducers have been widely used in fields where there are limitations on space and weight. The size and weight of servo systems installed on flying objects such as guided missiles are very important as their increase shortens the range of the object at given amount of fuel.The velocity control bandwidth and responsiveness of servo systems are greatly limited by the anti-resonance and resonance frequencies appearing in the motor angular velocity output to the motor torque input, [1,2]. The anti-resonance frequency is defined as the servo system's velocity control bandwidth.…”

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confidence: 99%

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On the frequency bandwidth change of a servo system with a gear reducer due to backlash and motor input voltage

Baek

Kwak

Kim

2003

Archive of Applied Mechanics (Ingenieur Archiv)

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The paper analyzes how the frequency bandwidth of a servo system is affected by the input voltage of its motor and the magnitude of the total backlash. The bandwidth of the system is defined as the set of antiresonance frequencies, which appears in the frequency-response characteristic. The change in the frequency-response characteristics is investigated depending on motor input voltage and the magnitude of the total backlash. It is shown that at infinite motor input voltage, the servo system has a bandwidth equivalent to that of a backlash-free system. The amount of the system's bandwidth reduction due to the backlash changes greatly with the motor input voltage. It becomes possible then to determine the necessary maximum input voltage of the motor and the admissible magnitude of the total backlash to satisfy the desired bandwidth for a servo system with a gear reducer. IntroductionIntelligent systems such as autonomous vehicles, unmanned airplanes and guided missiles require rapid responsiveness and outstanding adaptability to environments. Such requirements call for automatic servo devices with fast response. Therefore, servo systems with servomotors have been used extensively in many fields.In the case of servomotors, various direct drive motors that do not need gear reducers have been developed with the recent advances of motor technology. However, direct drive-type motors are larger in volume and weight compared to servo systems with gear reducers and have relatively low output torque. Consequently, servo systems with gear reducers have been widely used in fields where there are limitations on space and weight. The size and weight of servo systems installed on flying objects such as guided missiles are very important as their increase shortens the range of the object at given amount of fuel.The velocity control bandwidth and responsiveness of servo systems are greatly limited by the anti-resonance and resonance frequencies appearing in the motor angular velocity output to the motor torque input, [1,2]. The anti-resonance frequency is defined as the servo system's velocity control bandwidth. It is necessary to increase the system's anti-resonance frequency to achieve faster tracking and higher responsiveness, [1]. To this end, it is necessary to expand the bandwidth without increasing the weight of the system at the design revision stage.In related research, it was reported that the stiffness of driving linkages such as shafts greatly affects the bandwidth of a system, [3]. It was determined that the backlash affected the antiresonance and resonance frequencies of a system, [4]. Experimental verification showed that an increase of the backlash magnitude reduced the bandwidth, [5]. These studies showed also that the bandwidth reduction of the system due to backlash is small.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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On the frequency bandwidth change of a servo system with a gear reducer due to backlash and motor input voltage

Baek

Kwak

Kim

2003

Archive of Applied Mechanics (Ingenieur Archiv)

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“…I) is a very useful device which forms the basis of a wide range of practical instruments used for purposes of sighting and targeting in both surface and air-borne vehicles (Alford 1987, Bigley andRizzo 1987). By virtue of its inertial properties, this line-ofsight stabilization platform possesses the ability to maintain the fixed direction of the sight line of an electrooptical sensor when it is subjected to external disturbance such as the base motion of host vehicles on which it is mounted.…”

Section: Introductionmentioning

confidence: 99%

Real-time neural-network-based control of a gyro-mirror line-of-sight stabilization platform

Lee¹,

Ge²,

Hang³

et al. 1998

International Journal of Systems Science

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In this paper, we consider the real-time neural-network-based control of a gyro-mirror line-of-sight stabilization platform. This is an example of a multivariablc nonlinear servomechanism encountered in certain practiced applications, and the appropriate neural-network-based modelling and controller design are discussed. In the paper, real-time experimental results in applying the proposed controller to a pilot-scale gyro-mirror platform are presented to demonstrate its effectiveness. These experiments also serve to verify the analytical results in a proptotype real-time application.

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Composite control of a gyro mirror line-of-sight stabilization platform — design and auto-tuning

et al. 2001

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Wideband linear quadratic control of a gyro-stabilized electro-optical sight system

Cited by 20 publications

References 2 publications

On the frequency bandwidth change of a servo system with a gear reducer due to backlash and motor input voltage

On the frequency bandwidth change of a servo system with a gear reducer due to backlash and motor input voltage

Real-time neural-network-based control of a gyro-mirror line-of-sight stabilization platform

Composite control of a gyro mirror line-of-sight stabilization platform — design and auto-tuning

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