Synchronous Controller of LED Video Displays and LED Lighting Compatible

2011 ◽  
Vol 383-390 ◽  
pp. 6959-6963
Author(s):  
Jian She Sun ◽  
Xiao Ning Feng ◽  
Yi Fei Sun ◽  
Hui Zhao
Keyword(s):  
Control System ◽  
High Speed ◽  
Large Scale ◽  
Centralized Control ◽  
Fiber Communication ◽  
Protocol Conversion ◽  
Wide Range ◽  
Lighting Systems ◽  
Control Port ◽  
Control Distance

The development of a large display and can control a variety of compatible lighting control system, the system is suitable for wide range control distance. Can be widely used in modern college park, landscape building, business building and landscaping all buildings, publicity, service, advertising and other large screen and lighting systems. Using large-scale high-speed FPGA technology, Gigabit fiber communication technology, through a multi-level processing and protocol conversion, can be terminal for the different display mode (divided into static, 2 sweep, sweep 4, 8, sweep, sweep five kinds of 16), data in the order, alignment methods, control methods, the preparation of their own in the FPGA, the protocol conversion module, through the software are free to choose set the display terminal type, to achieve 16 control port can be controlled separately different types of display terminal. Control distance up to 5000 meters or more. Effectively address all the original control system can not be compatible, not centralized control, can not share resources and control of the key problems of distance is too short.

A New Method for High Speed CAN Protocol Conversion Circuit

2014 ◽  
Vol 596 ◽  
pp. 873-876
Author(s):  
Qi Li ◽  
Yan Fei Liu ◽  
Da Cheng Luo ◽  
Jing Jing Yang
Keyword(s):  
Real Time ◽  
High Speed ◽  
Large Scale ◽  
Can Bus ◽  
New Method ◽  
Time Performance ◽  
Test Instrument ◽  
Protocol Conversion

Due to high correspondence speed, great real-time performance and good expansibility, CAN bus has been used widely in aerospace, large-scale equipments and other fields these years .This paper introduces a kind of CAN Bus Test Instrument based on PXI bus and FPGA, which is used to test and monitor the CAN bus equipment. The result of test shows that this kind of test instrument has great advantages in reliability, stability and extensibility.

Control System Design for High Payload Industrial Robot via High Speed Communication Bus and Real-Time System

2011 ◽  
Vol 464 ◽  
pp. 272-278 ◽  
Author(s):  
Wei You ◽  
Min Xiu Kong ◽  
Li Ning Sun ◽  
Chan Chan Guo
Keyword(s):  
Control System ◽  
Real Time ◽  
High Speed ◽  
Industrial Robot ◽  
Engineering Application ◽  
Industrial Robots ◽  
Centralized Control ◽  
Time System ◽  
Real Time System ◽  
High Payload

In this paper, aiming at solving the problems of dynamic coupling effects and flexibility of joints and links, a kind of control system specialized for high payload industrial robots is proposed . After the comparisons between the control systems in all kinds of robots and numerical machines, industrial PC with TwinCAT real-time system is chosen as the motion control unit, EtherCAT is used for command transmitting. The whole control system has a decoupled and centralized control structure. The proposed control system is applied in control of a kind of high payload material handling robots with complex compound control algorithms. The final results shows that the control commands can be easily calculated and transmitted in one sample unit. The proposed control scheme is meaningful to real engineering application.

scholarly journals A large-scale image dataset of wood surface defects for automated vision-based quality control processes

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 581
Author(s):  
Pavel Kodytek ◽  
Alexandra Bodzas ◽  
Petr Bilik
Keyword(s):  
Quality Control ◽  
High Speed ◽  
Large Scale ◽  
Surface Defects ◽  
Recognition Rate ◽  
Raw Material ◽  
Technical Solution ◽  
Control Processes ◽  
Wide Range ◽  
Authentic Data

The wood industry is facing many challenges. The high variability of raw material and the complexity of manufacturing processes results in a wide range of visible structure defects, which have to be controlled by trained specialists. These manual processes are not only tedious and biased, but also less effective. To overcome the drawbacks of the manual quality control processes, several automated vision-based systems have been proposed. Even though some conducted studies achieved a higher recognition rate than trained experts, researchers have to deal with a lack of large-scale databases and authentic data in this field. To address this issue, we performed a data acquisition experiment set in the industrial environment, where we were able to acquire an extensive set of authentic data from a production line. For this purpose, we designed and implemented a complex technical solution suitable for high-speed acquisition during harsh manufacturing conditions. In this data note, we present a large-scale dataset of high-resolution sawn timber surface images containing more than 43 000 labelled surface defects and covering 10 types of the most common wood defects. Moreover, with each image record, we provide two types of labels allowing researchers to perform semantic segmentation, as well as defect classification, and localization.

COVID-19 Pandemic: World Central Banks’ Reactions to Economic Downturn

2021 ◽  
Vol 65 (2) ◽  
pp. 53-61
Author(s):  
V. Usoskin
Keyword(s):  
Monetary Policy ◽  
Global Economy ◽  
High Speed ◽  
Large Scale ◽  
Global Financial Crisis ◽  
Central Banks ◽  
Economic Downturn ◽  
Negative Consequences ◽  
Wide Range ◽  
Current Economic Situation

Measures to mitigate the effects of the COVID 19 pandemic on households and businesses taken by Western governments in 2020 had serious negative consequences for the global economy. There was a widespread fall of production and trade, the closure of enterprises and stagnation of entire industries, sharp increase in unemployment, rise of uncertainty and risks. In an effort to slow the development of economic downturn the central banks and the Treasuries had taken wide range of monetary measures. Some of which were the continuation of the programs initiated during the period of global financial crisis of 2007–2009 and adapted to the current economic situation and the others represented new programs for the purchase of financial assets and granting credit facilities to enterprises and households. These actions, aimed primarily at the issue of additional quantities of money into the circulation, were distinguished by very large scale and high speed of decision-making. The author’s analysis led to a conclusion that the monetary policy during COVID 19 pandemic helped to stabilize financial markets, preserved the activities of a part of small and medium-sized enterprises and improved employment in the labor market. At the same time, massive “quantitative easing” operations increased the risk of financial instability and the likelihood of emerging of difficult-to-control inflationary spiral in Western economies. As to the achievement of strategic goals of monetary policy in the macroeconomic sphere, the success was much less noticeable due to the influence of many nonmonetary factors on the level of employment and the rate of economic growth.

Decentralized Control of Structural Acoustic Radiation

2001 ◽  
Author(s):  
Kenneth D. Frampton
Keyword(s):  
Control System ◽  
Decentralized Control ◽  
Large Scale ◽  
Acoustic Radiation ◽  
Electrical Power ◽  
Computational Effort ◽  
Centralized Control ◽  
Mems Devices ◽  
Sensors And Actuators ◽  
Recent Developments

Abstract Although the application of active control to vibrations has been investigated from many years, the extension of this technology to large-scale systems has been thwarted, in part, by an overwhelming need for computational effort, data transmission and electrical power. This need has been overwhelming in the sense that the potential applications are unable to bear the power, weight and complex communications requirement of large-scale centralized control systems. Recent developments in MEMS devices and networked embedded devices have changed the focus of such applications from centralized control architectures to decentralized ones. A decentralized control system is one that consists of many autonomous, or semi-autonomous, localized controllers called nodes, acting on a single plant, in order to achieve a global control objective. Each of these nodes has the following capabilities and assets: 1) a relatively limited computational capability including limited memory, 2) oversight of a suite of sensors and actuators and 3) a communications link (either wired or wireless) with neighboring or regional nodes. The objective of a decentralized controller is the same as for a centralized control system: to maintain some desirable global system behavior in the presences of disturbances. However, decentralized controllers do so with each node possessing only a limited amount of information on the global systems response. Exactly what information each node has access to, and how that information is used, is the topic of this investigation.

Experimental Investigation of Tip Cavitating Vortices in Axial-Flow Pump

2017 ◽  
Author(s):  
Desheng Zhang
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Axial Flow ◽  
Operating Conditions ◽  
High Speed Imaging ◽  
Cavitation Performance ◽  
Stable Operating ◽  
Wide Range ◽  
Axial Flow Pump ◽  
Flow Pump

The primary goal of this work focuses on the cavitating vortices in the tip region of an axial-flow pump with 3 and 4 blades mainly based on the high-speed imaging experiments, with special attention on the trajectory and dynamics of a large-scale cavitation structure. The hydraulic and cavitation performance between two impellers were compared, and it can be found that the model with 4 blades has a relative wide range of stable operating conditions as well as the better anti-cavitation ability. By the analysis of the cavitation curves, it confirms that the highly unsteady tip cavitation cloud near the blade trailing edge should be responsible for the severe degradation of the performance. According to the detailed study on the cavitation evolution in the two impellers, it is observed that the trajectory of tip cavitating vortices for different flow rates seems very similar determined by the operating conditions. However, the dynamics varies significantly, which is associated with the blade loading and flow passage width.

scholarly journals PIV Measurements of the Wake Formation from a Rough Flat Plate

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Sean Lawrence ◽  
Callum Atkinson ◽  
Julio Soria
Keyword(s):  
Surface Roughness ◽  
Flat Plate ◽  
High Speed ◽  
Large Scale ◽  
Near Wake ◽  
Image Velocimetry ◽  
Wide Range ◽  
Smooth Body ◽  
And Performance ◽  
Effect Of Surface

Wake flows are prevalent in a wide range of engineering applications and their behaviour can significantly impact engineering design and performance. A considerable body of work exists on smooth body wake structures and flows over rough bodies, however, there is a lack of fundamental physical understanding of the amalgamation of the two fields. Two-component two-dimension particle image velocimetry (2C-2D PIV) is used to investigate the effect of surface roughness on the formation of large scale structures in the near wake of a thin flat plate. Both high-speed and low-speed, high-resolution PIV setups have been used to investigate the effect of surface roughness on the boundary layer and the near wake of the plate to gain insight into the underlying physical connection between these regions.

scholarly journals RECOGNITION ALGORITHMS FOR CORRELATION OF WELLS DURING DEVELOPMENT OF MINERALS

2019 ◽  
pp. 105-107
Author(s):  
E. V. Glivenko ◽  
M. I. Cheldiev ◽  
E. A. Alekseeva
Keyword(s):  
Research And Development ◽  
High Speed ◽  
Large Scale ◽  
Mineral Exploration ◽  
Computing System ◽  
System Research ◽  
Computing Platform ◽  
Large Scale Data ◽  
Wide Range ◽  
Scale Data

The  article  presents  the  problem  of  detecting  an  earth  layer,  containing  minerals,  describes  the  recognition  algorithms  for  computing devices of a portable type, designed to help the exploration geologist. These devices would be useful to the exploration  geologist at the time of determining the direction of the ridge containing minerals. To solve the problem of finding minerals, it is  proposed to use a universal heterogeneous multiprocessing computing platform (MСP), developed in M. A. Kartsev Computing  System Research and Development Institute intended for high‑speed processing of large‑scale data when solving a wide range  of hydroacoustics, radar, geophysics and mineral exploration tasks.

scholarly journals Engaging Multiple Actors in Large-Scale Transport Infrastructure Project Appraisal: An Application of MAMCA to the Case of HS2 High-Speed Rail

2018 ◽  
Vol 2018 ◽  
pp. 1-22 ◽  
Author(s):  
Yannick Cornet ◽  
Merrill Jones Barradale ◽  
Henrik Gudmundsson ◽  
Michael Bruhn Barfod
Keyword(s):  
Decision Making ◽  
High Speed ◽  
Large Scale ◽  
Multicriteria Analysis ◽  
Transport Infrastructure ◽  
High Speed Rail ◽  
Appraisal Process ◽  
Project Appraisal ◽  
Wide Range ◽  
Multiple Actors

The most widespread approach to transport appraisal is to combine cost-benefit analysis (CBA) with environmental assessments and public consultations. However, large-scale transport projects such as the HS2 high-speed rail system in the UK seem to have pushed this approach beyond its limits, leading to broad discontent with the appraisal process. There is a need both to develop new methods capable of integrating a wide range of perspectives in a systematic manner and to test these for large-scale projects. Multicriteria analysis (MCA) has proven useful in supporting transport decision-making by including a broader set of criteria in the appraisal process. Multiactor multicriteria analysis (MAMCA) has extended this approach to include multiple actors and stakeholders in the judgment and decision-making process. This paper builds on the MAMCA method and demonstrates its practicability and usability by applying it to the case of HS2. The purpose of this paper is not to reach a definitive conclusion on the desirability of various project options, but to complement existing transport appraisal methods by making different perspectives explicit. For example, the results for this case show contrasting views for different groups of transport professionals: a favorable assessment of HS2 among transport planners employed in government, but an unfavorable assessment among transport researchers with a background in sustainability. In terms of contribution to the development of data collection methods, this research demonstrates the usefulness of conducting semistructured interviews in conjunction with an online questionnaire for the assessment and weighting process within MCA. Because MCA results are expressed in terms of relative desirability of projects, the approach also effectively systematizes the inclusion and assessment of multiple options. Overall, the proposed method enhances the capacity to analyze conflicting views in large-scale transport project appraisal processes.

Ignition and Flame Stabilization of a Premixed Jet in Hot Cross Flow

2013 ◽  
Author(s):  
Denise Schmitt ◽  
Michael Kolb ◽  
Johannes Weinzierl ◽  
Christoph Hirsch ◽  
Thomas Sattelmayer
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Equivalence Ratio ◽  
Large Scale ◽  
Large Diameter ◽  
Flame Temperature ◽  
Cross Flow ◽  
Flame Stabilization ◽  
Wide Range ◽  
Cold Case

At the Institute of Thermodynamics, Technical University of Munich a large scale atmospheric combustion test rig has been designed and set up. The experimental setup is comprised of two burning zones: A first zone consists of 16 burners providing vitiated air at 1776K, into which a secondary fuel-air mixture jet is injected and ignited by the hot cross flow. The phenomenon is known in the literature as a reacting jet in hot cross flow. The hot data is compared to the cold case in order to show differences in the flow field due to flame propagation. For evaluating the flow field several experimental analyses have been applied so far (OH*, High-Speed PIV, Mixture Analysis). The focus of this paper is on the momentum ratios J = 4–10 with Jet Reynolds Numbers between 20,000 and 80,000. For the cold case the flow field is measured and compared with the reacting jet. In the injector the air and the natural gas are perfectly premixed. The equivalence ratio of the jet is varied over a wide range of mixtures (ϕ = 0.05–0.77) resulting in an adiabatic flame temperature of the jet between 800 and 2200K. As the pictures of the chemiluminescence analysis show the jet gas ignites immediately upon entering the hot cross flow. The distinct influence of the equivalence ratio on the flame length and shape can be seen in the data. The trajectory of the flame penetrates further into the channel compared to the trajectory of the cold case caused by the reaction in the flame and its resulting gas expansion. Due to the large diameter of the jet in the experiment the origins of the dominant flow patterns are obtained with high spatial resolution. Following this, flame anchoring mechanisms at different operation points are derived.

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