Papers by Keyword: Reconfiguration

Abstract: Single-event and multi-bit effects are the result of radiation and ionized particles in extreme settings like space, which can lead to random failures on any electronic component. To keep the functionality of the device unaltered, these must be reduced. FPGA plays a vital role in satellite and aerospace applications in which dynamic reconfiguration essential. Cascaded Integration Comb (CIC) filters are mostly utilized in multidata signal processing and satellite communication systems as low pass filters in rate converter modules. The configuration memory of FPGA used to design CIC filter is affected with soft errors with single and multi-bit due to high radiation in higher altitude and different environment regions. The methods like triple modular redundancy (TMR) is very effective in overcoming single event transients and single-event upsets, but incur area three times of the original module. Scrubbing is a serial process method that goes over each word in memory in search of mistakes that need to be fixed. It entails a non-negligible Time to Detect (TTD) prior to repair, in which time further functionality could happen parallely and jeopardize the system. Thus, effective multi-bit error detection correction of configuration memory in FPGA is essential in maintaining the application to work for an extended time. In this research, built-in multi-bit error correction for FPGA configuration memory is proposed. The proposed work can replace time consuming scrubbing process and high area utilizing TMR for error tolerant design. To safeguard FPGA, a multi-bit error detection and correction system is performed by using multi dimensional parity with minimum area overhead. Furthermore, the suggested method can identify and rectify error when triggered by an interrupt manager reducing time to detect (TTD).

Abstract: In this work, we investigated graphene hypersurface (HSF) for the manipulation of THz waves. The graphene HSF structure is consists of a periodic array of graphene unit cells deposited on silicon substrate and terminated by a metallic ground plane. The performance of the proposed HSF is numerically analyzed. Electromagnetic parameters of HSF such as permeability, permittivity, and impedance are studied. The proposed graphene HSF has active control over absorption, reflection, and transmission of THz waves. The graphene HSF provides perfect absorption, zero reflection and zero transmission at resonance. Moreover, the graphene HSF structure has the advantage of anomalous reflection and frequency reconfiguration. Incident waves can be reflected in the desired direction, depending on the phase gradient of the HSF and the perfect absorption is maintained at all reconfigurable frequencies upon reconfiguration. The results reveal the effectiveness of the graphene HSF for the manipulation of THz waves.

Abstract: Partial shading is the major contributing factor for reduced energy harvest in building integrated or rooftop photovoltaic (PV) systems. The architecture of the PV array is altered dynamically in accordance with shade intensity to alleviate the impact of partial shading. However, this technique demands more number of sensors, switches and a sophisticated control algorithm. In small urban residential installations, the shade is often caused by trees and structures in the same or nearby buildings and is inevitable due to space limitations. The shape and intensity of the shade does not vary rapidly in these cases and hence dynamic reconfiguration is not necessary. The paper addresses the issue by proposing a simple tailored architecture to enhance the output under shaded conditions without using additional sensors and switches. The location of the panels in an array is predetermined in the proposed work in such a way that the shade is evenly distributed all over the array. This reduces the mismatch losses and enhances the output. For utility purposes, asymmetric multilevel inverter controlled by FPGA (Field Programmable Gate Array) is employed and the results are presented.

Abstract: The paper is to study the use of reconfigurable machines and the computational environments for the synthesis of high quality reconfigurable automatic control systems, constructed on their basis. A key feature of the constructed system is that during establishment of the command variable the exact value of the error signal and its derivatives is not used. However the data regarding their signs are used. Besides the signal of the command variable can only take values from a binary set {0, 1}.

Abstract: A distribution network reconfiguration method with the considerations of time-varying weather conditions is proposed. The aim of distribution network reconfiguration is to minimize the outage risk. The effects of weather condition in evaluating the outage risk are considered. Finally, simulations on the 33-node test system validate the proposed method.

Abstract: Reconfigurable virtual instrument measurement model was put forward based on mobile terminal according to the problem of poor mobility and real-time performance in traditional test system. Research a dynamic communication mode in network space, reconfigurable virtual instrument library was developed in mobile devices which is support Android Operating System, and the networked wireless test was carried on, realized the function of reconfigurable virtual instrument test system on mobile terminal.

Abstract: Modern manufacturing plants even if they produce in large quantities, they often have to change the settings of their production lines. Customers do not want a standard product but personalized models. If the differences are only an option that can be mounted to the finished elements is not difficult. When the differences are much more serious and require changes in the technology of the element. Such orders are collected and made periodically so customers have to wait. Sometimes the wait time is several months. Changing the configuration of the production line or just a robot cell is a difficult and time-consuming process. It is necessary to stop the entire production line, the partially disassemble and installation of new equipment, and after the production of the series, the process repeated. The reconfiguration can take from several hours to several days, even weeks. These changes are costly, and these costs are borne by people buying individual model. Here are examples of the concepts presented elements of an exemplary robotic cell. Different degrees of modification will be presented from simple mechanical systems shortening the time to reconfigure the cell to a fully automatic reconfigurable systems. As an example will be presented to the cell welding. This cell is ready to make a specific item. The concept of adapting the cell to make the like is the first step modification. The next step is to automate the position so that the elements can be produced alternately. The introduction of an additional item of the approximated dimensions to the list made in a cell and automation, is another way to increase the flexibility of the cell. The final stage of the present article is the concept of robotic cell, designed to make the same process for any element. These concepts require a change in transmitting information to each of the stages and the whole process control at every stage. It is possible to transfer productive resources but this requires advanced management methods. Ensuring the mobility of selected measures to increase production efficiency but this requires the use of such multi-agent systems.

Abstract: This paper describes the design of palletizing workplace on a modular basis which can be reconfigured. First part of the paper is devoted to the definition of reconfigurable manufacturing systems and its core characteristics. Second part of the paper describes the workplace for palletization on a modular basis, its parts and possibilities of reconfiguration.

Abstract: In the paper, the fault-tolerant control strategy for the aero-engine electronic control system is researched based on the Model Reference Adaptive Control method. In the design process, a new reference model design method is proposed with the Raccatti equation, which can guarantee the reconfiguration system have satisfactory performance. According to the sensor failure models, the failure system mathematic model is given. Lyapunov stability theory was applied to obtain the adaptive control law through design a Lyapunov function, which can ensure the strictly positive realness and global asymptotic stability for the reconfiguration control system. For the typical sensor failures, the reconfiguration effect with the control strategy is simulated and verified in the Matlab, which revealed that the aero-engine control system could operate well under the failure with the fault-tolerant control.

Abstract: Based on mobile communication platform, the dynamic measurement system of component virtual instrument structure assemble model was proposed according to the conditions of bad commonality and mobility of tradition measurement system. Reconfiguration virtual system of mobile communication platform was realized by the use of virtual instrument system of measuring different parameters at the Android operating system and accomplished wireless network testing capabilities meanwhile, and the flexibility and scalability of wireless interactive operation and meassured data in real-time monitoring system can be enhanced.