Arrangement for the attitude stabilization of flexible vehicles with weakly-dampened structural vibrations and discontin
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64G-001/20
출원번호
US-0275359
(1981-06-19)
우선권정보
EP-0104916 (1980-08-19)
발명자
/ 주소
Bittner Helmut (Munich DEX) Gottzein Eveline (Oberpframmern DEX) Surauer Michael (Chieming DEX)
출원인 / 주소
Messerschmitt-Blkow-Blohm Gesellschaft mit beschrnkter Haftung (Munich DEX 03)
인용정보
피인용 횟수 :
15인용 특허 :
7
초록▼
An arrangement for the attitude stabilization of flexible vehicles, such as aircraft and spacecraft. Such vehicles, due to their lightweight construction and/or large spatial extension or high degree of slenderness, have structurally weakly-dampened bending vibrations and/or torsional vibrations. Fo
An arrangement for the attitude stabilization of flexible vehicles, such as aircraft and spacecraft. Such vehicles, due to their lightweight construction and/or large spatial extension or high degree of slenderness, have structurally weakly-dampened bending vibrations and/or torsional vibrations. For generating the forces and moments required for stabilizing such vehicle, discontinuously operating units are used. In one embodiment, for each vehicle axis, an observer or Kalman filter is employed for obtaining estimated values of the state variables of the vehicle system to be controlled. The observer has a first transfer function of at most third order. A state controller device is responsive to the observer for controlling the state variables. A modulator network is responsive to the state controller device wherein the modulator network has a relay characteristic. In this embodiment, a feedback path is arranged from the output of the modulator network to the observer which eliminates the need for a special modulator network having a second transfer function and also eliminates internal modulator feedback. In another form of the invention, the feedback is arranged from the input of the modulator to the observer and a low pass filter is included between the state controller device and the modulator network. The filter has either at least two low pass filter sections of first order or a single low pass filter section of at least second order. The break-point frequencies of the filter section or sections lies between the natural frequency of the rigid body and the lower structural resident frequency of the respective vehicle axis. Equivalent circuits are disclosed for replacing the observer and state controller device as described above. Adaptive techniques as well as digital realizations of the various embodiments are also disclosed.
대표청구항▼
In an arrangement for the attitude stabilization of flexible vehicles, such as aircraft and spacecraft, which, due to their lightweight construction and/or large spatial extension or their high degree of slenderness, have, structurally, weakly-dampened, bending vibrations and/or torsional vibrations
In an arrangement for the attitude stabilization of flexible vehicles, such as aircraft and spacecraft, which, due to their lightweight construction and/or large spatial extension or their high degree of slenderness, have, structurally, weakly-dampened, bending vibrations and/or torsional vibrations, and in which, for generating the forces and moments required for stabilization of the vehicle, discontinuously operating actuators are used, the improvement comprising that for each vehicle axis, there are: (a) only a single observer means responsive to signals representing attitude measurements for providing signals representing estimated values of the state variables of the vehicle system to be controlled, said observer means having a transfer function of at most third order; (b) state controller means, responsive to the observer means, for providing signals for controlling the state variables; (c) means, responsive to the state controller means, for modulating the signal produced by the state controller means, and having a relay characteristic; (d) means for supplying a feedback signal from the input of the modulating means to the observer means; and (e) a low pass filter at the output side of the state controller means and at the input side of the modulating means, said filter having either a pair of low pass filter sections with first order transfer functions or a single low pass filter section with at least a second order transfer function, the break-point frequencies of the first order transfer functions or second order transfer functions being between the natural resonance frequency for position stabilization and the natural resonant frequency of vibration stabilization for the vehicle axis to be stabilized; wherein the actuators are responsive to said modulating means and act upon the vehicle with the stabilization forces and moments, respectively, produced by the actuators.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (7)
Broquet Jean B. (Saint Cyr l\Ecole FRX), Attitude control systems for space vehicles.
Bruderle Ernst (Ottobrunn DEX) Gottzein Eveline (Oberpframmern DEX) Bittner Helmut (Munich DEX), Controller for the attitude stabilization of a satellite.
Surauer Michael (Chieming DEX) Porte Francois (Munich DEX) Bittner Helmut (Munich DEX), Apparatus for controlling the attitude of and stabilizing an elastic body.
Kamiya, Toshio; Maeda, Ken; Hashimoto, Tatsuaki; Sakai, Shinichiro, Attitude control data creating method, and attitude control system applying the method.
Smay John W. (Torrance CA) Hummel ; Jr. William F. (Los Angeles CA) Chen Carl L. (Rolling Hills Estate CA) Slafer Loren I. (Los Angeles CA), Method for controlling the spin axis attitude of a spinning spacecraft.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.