Gravity Control by means of Electromagnetic Field through Gas or Plasma at Ultra-Low Pressure

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No Abstract Available

No Abstract Available

Abstract We propose and test a method for controlling the charging of the Gravity Probe B(GP-B) electrostatically suspended gyroscopes using electrons generated by field emission cathodes. The GP-B Gyroscope Experiment is designed to measure for the first time the geodetic and the frame-dragging effects predicted by Einstein's general theory of relativity. The expected accuracy of ?0.3 marcsec/yr (10-11 deg/h) will allow for a 0.01% measurement of the geodetic effect and a 1% measurement of the frame-dragging effect. Gyroscope charging is caus...

Abstract We propose and test a method for controlling the charging of the Gravity Probe B(GP-B) electrostatically suspended gyroscopes using electrons generated by field emission cathodes. The GP-B Gyroscope Experiment is designed to measure for the first time the geodetic and the frame-dragging effects predicted by Einstein's general theory of relativity. The expected accuracy of ?0.3 marcsec/yr (10-11 deg/h) will allow for a 0.01% measurement of the geodetic effect and a 1% measurement of the frame-dragging effect. Gyroscope charging is caus...

Abstract We propose and test a method for controlling the charging of the Gravity Probe B(GP-B) electrostatically suspended gyroscopes using electrons generated by field emission cathodes. The GP-B Gyroscope Experiment is designed to measure for the first time the geodetic and the frame-dragging effects predicted by Einstein's general theory of relativity. The expected accuracy of ?0.3 marcsec/yr (10-11 deg/h) will allow for a 0.01% measurement of the geodetic effect and a 1% measurement of the frame-dragging effect. Gyroscope charging is caus...

Field gravity survey and lunar mascon gravity gradients

Field gravity survey and lunar mascon gravity gradients

Abstract This paper describes the development of a mobile manipulator with the control of its gravity center position. We have presented the three degree-of-freedom manipulator with the control of its horizontal gravity center position by using one kinematics redundancy on two dimensional Cartesian coordinates (horizontal and vertical one). So, by adding mobility to this manipulator, we developed a mobile manipulator. It is the characteristic of this mobile manipulator that the control method only controls the gravity center position of the ma...

Abstract This paper describes the development of a mobile manipulator with the control of its gravity center position. We have presented the three degree-of-freedom manipulator with the control of its horizontal gravity center position by using one kinematics redundancy on two dimensional Cartesian coordinates (horizontal and vertical one). So, by adding mobility to this manipulator, we developed a mobile manipulator. It is the characteristic of this mobile manipulator that the control method only controls the gravity center position of the ma...

Abstract In our previous works, we have proposed "virtual passive dynamic walking" with virtual gravity for biped robots in order to realize active walking on level ground without any gait design in advance. In this paper, we discuss some control problems of a kneed biped robot and propose "modified compass-like virtual passive dynamic walking" with active knee-lock algorithms in order to avoid the "foot scuffing" problem during the single support phase. Furthermore, a virtual coupling control law is proposed which can realize a variable walki...

Abstract In our previous works, we have proposed "virtual passive dynamic walking" with virtual gravity for biped robots in order to realize active walking on level ground without any gait design in advance. In this paper, we discuss some control problems of a kneed biped robot and propose "modified compass-like virtual passive dynamic walking" with active knee-lock algorithms in order to avoid the "foot scuffing" problem during the single support phase. Furthermore, a virtual coupling control law is proposed which can realize a variable walki...

Abstract A fuzzy observer-based mixed parallel distributed compensation (PDC) fuzzy controller is utilized to generate guidance law for lunar gravity-turn descent. First, the Takagi-Sugeno fuzzy model is employed to approximate the probe system. Next, based on fuzzy model, a fuzzy observer-based mixed parallel distributed compensation (PDC) fuzzy controller is discussed in accordance with the definition of stability in the sense of Lyapunov. Robust stability and disturbance rejection technique are also proposed in the design of following guida...

Abstract Force-free control can realize the flexible motion of industrial articulated robot arms without any change of the built-in controller. In this paper, the force-free control was extended to realize the motion as if it were under the circumstance of any inertia, any friction and any gravity through the independent compensation of inertia, friction and gravity. The property of the force-free control with independent compensation was also investigated by the experimental study of an actual industrial articulated robot arm, where the exter...

Abstract This paper presents a complete dynamic model and a hybrid design method for the high precision pneumatic constant pressure control system for a gravity compensation suspension device. The pneumatic system components consist of newly-developed frictionless cylinders without mechanical seals, a large tank and an electro-pneumatic proportional pressure valve. The complete mathematical models are derived, which consist of valve dynamics and flow nonlinearities through the valve orifice, pressure evolution in cylinder chambers and tank, an...

The purpose of this document is to identify and briefly examine the control problems of the proposed Gravity Probe-B spacecraft. Suggestions are made for control thruster geometry, dynamics, and maximum output value. Maximum total thrust is also a consideration since all thrusters expel gaseous helium produced from a common liquid supply. Control philosophy and preliminary designs are presented for both the attitude and drag free control systems. A radial separation of the spacecraft center of mass and the center of the proof mass cavity produc...