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The quasi-zenith satellite (QZS-1) is the first Japanese first navigation satellite to demonstrate the technology for providing GPS interoperable and augmentation services around Japan and Oceania. The attitude and orbit control system (AOCS) of the QZS-1 has several features that improve the mission availability. The use of a star tracker in a GEO altitude orbit and yaw steering function for high...
The Plug and Play Satellite (PnPSat) Program, initiated by the Air Force Research Laboratory in Albuquerque, is both a testbed for innovative spacecraft components and integration concepts, and a fully functional spacecraft with the first Flight Unit rapidly approaching flight readiness. While the intent of the PnPSat Program is to prove out technologies and implement processes that allow rapid integration...
Smart Grid refers to electric power systems that enhance grid reliability and efficiency by automatically anticipating and responding to system disturbances. To achieve smart grid at the power distribution system level, various automatic technologies have been attempted in the areas of system metering, protection, and control. Within these technologies, automated power restoration is an important...
In the paper, one method of the parallel switching on the coordinate switchboard IMS C004 is proposed. This way allows to carry out the parallel switching of channels in the packet mode.
In the paper, problems of the information processing device designing are discussed. A new design of device of information processing based on the matrix switchboard is offered. Such decision allows to reduce hardware expenses and also to reduce reconfiguration time for system.
All Apollo landings were performed by the crew, manually commanding the lunar module (LM) attitude and rate-of-descent (ROD). In future missions, the astronauts will again need manual control of the flight path and attitude. Crew interaction mechanisms have been proposed to re-designate a landing aimpoint during the approach phase. However, manual control modes, crew control capability, and resulting...
In this paper, the control allocation problem is discussed for a flight vehicle with multiple actuators, that is lateral jets and aerodynamic fins. The usage of aerodynamic surface is not constrained, while the usage of lateral jets has to be minimized due to the limited amount of fuel available on-board. A switching logic is employed to allocate the two actuators optimally. We formulate the control...
Model predictive control with a finite control set has emerged as a promising control tool for power converters and drives. One of the major advantages is the possibility to control several system variables with a single control law, by including them with appropriate weighting factors. However, at the present state of the art, these coefficients are determined empirically. There is no analytical...
Induction motor speed sensorless torque control, which allows operation at low and zero speed, optimizing both torque response and efficiency, is proposed. The control is quite different than the conventional field-oriented or direct torque control. A new discontinuous stator current FPGA based controller and rotor flux observer based on sliding mode and Lyapunov theory are developed analyzed and...
Many power-assist systems for industrial uses possess simple power-assisting function only. The authors studied on the positioning method of a cart using a smooth switching from the servo access control for the conveyance function to the force sensorless impedance control (FSLIC) for the power-assisting function. The nonstationary optimal control method and the nonstationary impedance control law...
This paper presents a new methodology to implement a permanent magnet linear synchronous motor. The proposed method is a combination way which is combined the fast terminal sliding mode with the direct thrust control method. The intended advantage of the proposed method is that the chattering phenomenon can be reduced and/or removed. To our knowledge, the inherent flux linkage problems of permanent...
This paper has introduced the application of FIX DMACS industrial control configuration software on hydraulic control technology, and the basic composing of hydraulic experimental platform of hydraulic control valve. With the background of hydraulic experimental platform, it proves FIX DMACS has being applied in this field widely. We exemplify the related characteristics of hydraulic control valve...
The strongly nonlinear magnetic characteristic of switched reluctance motors (SRMs) makes their torque control a challenging task. In contrast to standard current-based control schemes, we use model predictive control (MPC) and directly manipulate the switches of the dc-link power converter. At each sampling time a constrained finite-time optimal control problem based on a discrete-time nonlinear...
Finite states model predictive control (FS-MPC) appears as a promising control technique to be applied to power converters in the industry. However, the FS-MPC presents some drawbacks as non constant switching frequency and high sampling frequency. This work proposes a FS-MPC with constant switching frequency and low sampling frequency applying a discrete space vector modulation (DSVM) technique....
Modulation of multilevel converters is the focus of researchers looking for high quality of the output waveforms with low losses. This paper shows that multiple switching sequences can be used in order to generate the desired phase voltage. A simple two-dimensional modulation technique for two-cell multilevel cascaded converters is introduced in this paper. Using a two-dimensional control region,...
This paper presents a new power regulation method for contactless power transfer systems that combines current magnitude control of a series tuned resonant converter with energy injection concepts suitable for constant load or single pick-up applications. In the latter, the control of the primary converter operates with asymmetrical control, to regulate the magnitude of the high frequency primary...
Operation of electric drives may be negatively affected by non-standard conditions in the power network such as voltage unbalance, which may arise in three-phase power networks. The unbalance can be caused by a failure in the network or by unbalanced load in the vicinity of the affected drive. Unsymmetrical voltages at the input of a voltage source inverter cause pulsations in the DC-link voltage...
This paper deals with a problem of controller adaptation for a system known to be in a certain set of linear time-invariant systems. It is assumed that there exists a set of linear stabilizing controllers. A method for calculating a minimum switching time between controllers commonly known as dwell time such that stability of the closed loop linear time-varying system is guaranteed is given in this...
A mobile robot prototype with independent propulsion and individual steering (4WD4WS)has been developed. The mission-oriented mobile robot has the adaptability of terrain, sensors and payload with the scope of 20 kilograms. Different prototypes with diversified wheelbase, wheel stance, clearance, stability margin and altitude of center of gravity can be achieved by reconfiguration. A wheel with high...
The hydraulic automatic gauge control (AGC) of cold rolling mill is directly related to the quality and effectiveness of cold rolling aluminum sheet strips. Traditional PID control becomes difficult to satisfy the necessity of improving the control performance of cold rolling mill. A new variable structure control (VSC) based on a co-ordination optimization algorithm has been developed. Both steady...
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