Control reconfiguration

About: Control reconfiguration is a research topic. Over the lifetime, 22423 publications have been published within this topic receiving 334217 citations.

Reconfigurable manufacturing systems and their enabling technologies

Abstract: A reconfigurable manufacturing system (RMS) is designed for rapid adjustment of production capacity and functionality in response to new market conditions and new process technology. It has several distinct characteristics including modularity, integrability, customisation, convertibility and diagnosability. There are a number of key interrelated technologies that should be developed and implemented to achieve these characteristics. This paper examines and identifies these technologies. After a brief description of the RMSs and their goals, aspects of reconfiguration (reconfigurable system, software, controller, machine, and process) are explained; this provides one with a better understanding of the enabling technologies of RMSs. Some of the issues related to the technology requirements of RMSs at the system and machine design levels, and ramp -up time reduction are then explained. The paper concludes with descriptions of some of the future research directions for RMSs.

FPGASort: a high performance sorting architecture exploiting run-time reconfiguration on fpgas for large problem sorting

Abstract: This paper analyses different hardware sorting architectures in order to implement a highly scaleable sorter for solving huge problems at high performance up to the GB range in linear time complexity. It will be proven that a combination of a FIFO-based merge sorter and a tree-based merge sorter results in the best performance at low cost. Moreover, we will demonstrate how partial run-time reconfiguration can be used for saving almost half the FPGA resources or alternatively for improving the speed. Experiments show a sustainable sorting throughput of 2GB/s for problems fitting into the on-chip FPGA memory and 1 GB/s when using external memory. These values surpass the best published results on large problem sorting implementations on FPGAs, GPUs, and the Cell processor.

The Chimaera reconfigurable functional unit

Abstract: By strictly separating reconfigurable logic from the host processor, current custom computing systems suffer from a significant communication bottleneck. In this paper, we describe Chimaera, a system that overcomes the communication bottleneck by integrating reconfigurable logic into the host processor itself. With direct access to the host processor's register file, the system enables the creation of multi-operand instructions and a speculative execution model key to high-performance, general-purpose reconfigurable computing. Chimaera also supports multi-output functions and utilizes partial run-time reconfiguration to reduce reconfiguration time. Combined, the system can provide speedups of a factor of two or more for general-purpose computing, and speedups of 160 or more are possible for hand-mapped applications.

System identification for adaptive and reconfigurable control

Abstract: In this work, an efficient static system identification method is developed that incorporates prior information. The prior information from flight mechanics enhances the performance of the identification algorithm, yielding more accurate parameter estimates. The proposed static system identification approach is superior to dynamic system identification for on-line identification of rapidly varying plant parameters, making it suitable for adaptive and reconfigurable control. The effectiveness of the static system identification scheme is illustrated in an example problem. A derivative F-16 aircraft control surface (elevator) failure is simulated and the abruptly changing pitch channel control system's stability and control derivatives are successfully identified on-line in the presence of unmodeled dynamics, process noise (clear air turbulence), and realistic measurement noise.

Formation Establishment and Reconfiguration Using Impulsive Control

Abstract: We analyze spacecraft formation establishment and reconfiguration problems for two-body orbits. The desired formations are characterized by nonsingular orbital-elemental differences. An analytical, two-impulse solution is proposed for achieving the desired orbital-elemental differences. Gauss's variational equations are used to compute the corresponding impulse magnitudes analytically and the resulting solutions can be easily implemented using onboard computational resources. It is also shown that the cost obtained from the analytical solution differs by less than 1 % from that obtained by numerical optimization.