Academic literature on the topic 'Remote relay testing'
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Journal articles on the topic "Remote relay testing"
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Ren, Jian Feng, and Shu Tao Zhao. "Transformer Automatic Test System Based on Virtual Instrument." Applied Mechanics and Materials 556-562 (May 2014): 3084–87. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.3084.
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This paper introduces a transformer automatic test system based on virtual instrument (LabVIEW) and PCI hardware platform, and being Improved separately from hardware and software section. use remote control functions to achieve relay testing automatic commutation function and remote automatic control; Increase the voltage and the current automatic locking feature in the empty / load test, and not only improve the security and accuracy of the test system, but also greatly improve the automation of the test system.
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Wang, Junkang, Jiayi Wang, Jishun Wu, Weidong Wang, Yejie Liu, and Quanke Ba. "Research on integrated test technology of relay protection device based on cloud-edge collaboration." Journal of Physics: Conference Series 2290, no. 1 (June 1, 2022): 012035. http://dx.doi.org/10.1088/1742-6596/2290/1/012035.
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Abstract The relay protection debugging of smart substation is limited to single unit test. For the intelligent equipment across bays, it can only be tested in batches and one by one, and there is no means to test the integrated system of bus and main transformer with multiple bays. This paper proposes an integrated test technology of intelligent substation based on cloud-edge collaboration. Build an integrated test system based on cloud edge collaboration, which is cross bays, multi intelligent devices and remote vertical connection. Open up the test island of single equipment. Establish equipment signal acquisition and output, multi-protocol access of edge equipment, unified cloud management and process monitoring system. It can realize the value integration of high-quality resources such as substation managers, testers and test expert database. This method improves the testing comprehensiveness, pertinence and timeliness.
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Balde, Alpha Yaya, Emmanuel Bergeret, Denis Cajal, and Jean-Pierre Toumazet. "Low Power Environmental Image Sensors for Remote Photogrammetry." Sensors 22, no. 19 (October 8, 2022): 7617. http://dx.doi.org/10.3390/s22197617.
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This paper aims to prove the feasibility of a 4D monitoring solution (3D modeling and temporal monitoring) for the sandbar and to characterize the species’ role in the landscape. The developed solution allows studying the interaction between the river dynamics and vegetation using a network of low resolution and low power sensors. The issues addressed concern the feasibility of implementing a photogrammetry solution using low-resolution sensors as well as the choice of the appropriate sensor and its testing according to different configurations (image capture and storage on the sensor and/or image transmission to a centralization node) and also the detailed analysis of the different phases of the process (camera initialization, image capture, network transmission and selection of the most appropriate standby mode). We reveal that the tiny, low-cost board (ESP32-Cam) can perform a 3D reconstruction and propose using the camera’s UXGA (1600, 1200) resolution because of the quality rendering and energy consumption. A multi-node scenario based on a combined Wi-Fi and GSM relay is proposed in the study showing several years of autonomy for the system. Finally, to illustrate the energy cost of the module, we have defined a study process, where we have identified and quantified one by one the different phases of operation of the card for better energy optimization (setup, camera configuration, shooting, saving on SD card, or sending by Wi-Fi). The device is now operational for deployment on the Allier River (France).
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Park, Jaewoo, Franklyn Jumu, Justin Power, Maxime Richard, Yomna Elsahli, Mohamad Ali Jarkas, Andy Ruan, Adina Luican-Mayer, and Jean-Michel Ménard. "Drone-Mountable Gas Sensing Platform Using Graphene Chemiresistors for Remote In-Field Monitoring." Sensors 22, no. 6 (March 19, 2022): 2383. http://dx.doi.org/10.3390/s22062383.
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We present the design, fabrication, and testing of a drone-mountable gas sensing platform for environmental monitoring applications. An array of graphene-based field-effect transistors in combination with commercial humidity and temperature sensors are used to relay information by wireless communication about the presence of airborne chemicals. We show that the design, based on an ESP32 microcontroller combined with a 32-bit analog-to-digital converter, can be used to achieve an electronic response similar, within a factor of two, to state-of-the-art laboratory monitoring equipment. The sensing platform is then mounted on a drone to conduct field tests, on the ground and in flight. During these tests, we demonstrate a one order of magnitude reduction in environmental noise by reducing contributions from humidity and temperature fluctuations, which are monitored in real-time with a commercial sensor integrated to the sensing platform. The sensing device is controlled by a mobile application and uses LoRaWAN, a low-power, wide-area networking protocol, for real-time data transmission to the cloud, compatible with Internet of Things (IoT) applications.
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Prabowo, Dhito Aji Tri, Marsekal Dadrian Setyayudha, and Renny Sari Dewi. "Implementasi Intelligent IoT Gateway Sebagai Pengendali Jarak Jauh Pada Raspberry Pi Berbasis OpenWrt." JURIKOM (Jurnal Riset Komputer) 7, no. 1 (February 15, 2020): 104. http://dx.doi.org/10.30865/jurikom.v7i1.1882.
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Internet of Things is a concept where a particular object has a function to transfer data through wireless networks and the internet as a remote controller, this activity does not require interaction from human to human or human to computer. Everything has been run automatically with the program. Internet of Things is commonly called IoT. By implementing IoT at home it is hoped that it can improve efficiency and comfort for the occupants of the house. The smart home system that will be made has two main elements, namely an Android-based smart phone device and an automation system that has been installed on a Raspberry-Pi that has OpenWrt firmware installed and is connected directly to the relay. The system will also be equipped with an ACS712 current sensor and a ZMPT101B voltage sensor, the two devices are used to obtain electrical voltage data which will then be stored in storage on the router. After testing using AVOmeter, the data difference is relatively small. The error rate of the voltage gauge is 4.1% on average and the error rate of the current sensor is 6.2%. Data from the electricity load will be displayed on the application on an Android-based smart phone device. The results of this study are a remote control system for devices connected to electricity and provide information to analyze the use of electrical loads at home, so they can choose devices that should not be activated by the system so as to cut monthly electricity costs
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Swan, A., P. Skipworth, L. Walker, and G. Thursfield. "Field testing a remote monitoring system for hand water pumps." Water Practice and Technology 13, no. 4 (December 1, 2018): 821–31. http://dx.doi.org/10.2166/wpt.2018.093.
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Abstract Throughout Africa, many hand water pumps malfunction and remain inoperable for long periods of time. Previous studies from a number of sub-Saharan countries have indicated that in some regions up to 65% of hand pumps may be broken. It is reported that robust monitoring of remote water pumps can help address some of these problems. However, traditional project monitoring strategies generally rely on physical site visits to remote locations. These visits can be time consuming and resource intensive, which in turn may delay the implementation of pump repairs. In contrast, recent years have seen the emergence of a range of new monitoring technologies that use mobile phone networks to rapidly report the operational status of water projects from remote sites. The authors describe the development of a new monitoring system, called MANTIS, which is intended for hand pumps in developing regions. The paper presents data from early field trials of MANTIS in Sierra Leone and The Gambia. The unit relays ‘near real time’ operational data from the water pump to an accessible online platform.
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Chen, Lei, Ping Wang, Fuqiang Liu, Chao Wang, Haibo Zhou, Lijun Pu, Jiping Xiong, and Nguyen Ngoc Van. "A Replay Approach for Remote Testing User Experience of Mobile Bursty Data Application." International Journal of Online Engineering (iJOE) 9, S7 (October 22, 2013): 18. http://dx.doi.org/10.3991/ijoe.v9is7.3187.
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Hengel, Belinda, Rebecca Guy, Linda Garton, James Ward, Alice Rumbold, Debbie Taylor-Thomson, Bronwyn Silver, et al. "Barriers and facilitators of sexually transmissible infection testing in remote Australian Aboriginal communities: results from the Sexually Transmitted Infections in Remote Communities, Improved and Enhanced Primary Health Care (STRIVE) Study." Sexual Health 12, no. 1 (2015): 4. http://dx.doi.org/10.1071/sh14080.
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Background Remote Australian Aboriginal communities experience high rates of bacterial sexually transmissible infections (STI). A key strategy to reduce STIs is to increase testing in primary health care centres. The current study aimed to explore barriers to offering and conducting STI testing in this setting. Methods: A qualitative study was undertaken as part of the STI in Remote communities, Improved and Enhanced Primary Health Care (STRIVE) project; a large cluster randomised controlled trial of a sexual health quality improvement program. We conducted 36 in-depth interviews in 22 participating health centres across four regions in northern and central Australia. Results: Participants identified barriers including Aboriginal cultural norms that require the separation of genders and traditional kinship systems that prevent some staff and patients from interacting, both of which were exacerbated by a lack of male staff. Other common barriers were concerns about client confidentiality (lack of private consulting space and living in small communities), staff capacity to offer testing impacted by the competing demands for staff time, and high staff turnover resulting in poor understanding of clinic systems. Many participants also expressed concerns about managing positive test results. To address some of these barriers, participants revealed informal strategies, such as team work, testing outside the clinic and using adult health checks. Conclusions: Results identify cultural, structural and health system issues as barriers to offering STI testing in remote communities, some of which were overcome through the creativity and enthusiasm of individuals rather than formal systems. Many of these barriers can be readily addressed through strengthening existing systems of cultural and clinical orientation and educating staff to view STI in a population health framework. However others, particularly issues in relation to culture, kinship ties and living in small communities, may require testing modalities that do not rely on direct contact with health staff or the clinic environment.
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Páez, Felipe, and Héctor Kaschel. "Design and Testing of a Computer Security Layer for the LIN Bus." Sensors 22, no. 18 (September 13, 2022): 6901. http://dx.doi.org/10.3390/s22186901.
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Most modern vehicles are connected to the internet via cellular networks for navigation, assistance, etc. via their onboard computer, which can also provide onboard Wi-Fi and Bluetooth services. The main in-vehicle communication buses (CAN, LIN, FlexRay) converge at the vehicle’s onboard computer and offer no computer security features to protect the communication between nodes, thus being highly vulnerable to local and remote cyberattacks which target the onboard computer and/or the vehicle’s electronic control units through the aforementioned buses. To date, several computer security proposals for CAN and FlexRay buses have been published; a formal computer security proposal for the LIN bus communications has not been presented. So, we researched possible security mechanisms suitable for this bus’s particularities, tested those mechanisms in microcontroller and PSoC hardware, and developed a prototype LIN network using PSoC nodes programmed with computer security features. This work presents a novel combination of encryption and a hash-based message authentication code (HMAC) scheme with replay attack rejection for the LIN communications. The obtained results are promising and show the feasibility of the implementation of an LIN network with real-time computer security protection.
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Needs, Sarah H., Stephanie P. Bull, Josefina Bravo, Sue Walker, Gemma Little, Julie Hart, and Alexander D. Edwards. "Remote videolink observation of model home sampling and home testing devices to simplify usability studies for point-of-care diagnostics." Wellcome Open Research 5 (July 21, 2020): 174. http://dx.doi.org/10.12688/wellcomeopenres.16105.1.
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Both home sample collection and home testing using rapid point-of-care diagnostic devices can offer benefits over attending a clinic/hospital to be tested by a healthcare professional. Usability is critical to ensure that in-home sampling or testing by untrained users does not compromise analytical performance. Usability studies can be laborious and rely on participants attending a research location or a researcher visiting homes; neither has been appropriate during COVID-19 outbreak control restrictions. We therefore developed a remote research usability methodology using videolink observation of home users. This avoids infection risks from home visits and ensures the participant follows the test protocol in their home environment. In this feasibility study, volunteers were provided with models of home blood testing and home blood sampling kits including a model lancet, sampling devices for dried blood spot collection, and model lateral flow device. After refining the study protocol through an initial pilot (n = 7), we compared instructions provided either as written instructions (n = 5), vs addition of video instructions (n = 5), vs written and video instructions plus videolink supervision by the researcher (n = 5). All users were observed via video call to define which test elements could be assessed remotely. All 22 participants in the study accessed the video call and configured their videolink allowing the researcher to clearly observe all testing tasks. The video call allowed the researcher to assess distinct errors during use including quantitative (volume of blood) and qualitative (inaccurate interpretation of results) errors many of which could compromise test accuracy. All participants completed the tasks and returned images of their completed tests (22/22) and most returned completed questionnaires (20/22). We suggest this remote observation via videolink methodology is a simple, rapid and powerful methodology to assess and optimise usability of point-of-care testing methods in the home setting.
Dissertations / Theses on the topic "Remote relay testing"
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Musaruddin, Mustarum. "Automatic fault analysis in power systems via application service provider." Thesis, 2011. http://hdl.handle.net/2440/70281.
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This dissertation presents a new approach to automated fault analysis in electrical power systems. New contributions to the fault and disturbance investigation topic are automated fault analysis service (AFAS) via application service provider (ASP) and remote relay testing service (RRTS). The implementation of AFAS complies with the new international standard of communication network and system in substations (IEC-61850). The signal processing approaches in an automated fault analysis service are based on the wavelet transform and empirical mode decomposition methods. Several case studies have been carried out to test the performance of the signal segmentation technique. The data for analyses are from simulated fault data and from real disturbance records obtained from the intelligent electronic devices (IEDs) in substations. The implementation of AFAS and RRTS was developed using C# with .NET technologies, MATLAB and open source software. Signal segmentation, signal modelling, fault type classification, fault location service, a web-based COMTRADE viewer and remote relay test service have been developed in this dissertation. Such services are designed to enhance manual investigations performed by engineers. The services have been tested extensively using disturbance records from power utilities and a power system simulation model.Thesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2011
Book chapters on the topic "Remote relay testing"
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Aina, Segun, Samuel Dayo Okegbile, Adeniran Ishola Oluwaranti, Oghenerukome Brenda Okoro, and Tayo Obasanya. "Toward a More Robust Home Automated System." In Research Anthology on Cross-Disciplinary Designs and Applications of Automation, 825–41. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3694-3.ch040.
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The work reported in this article developed a home automated system using voice activation. This is with a view to providing users complete control over electrical appliances using simple easy to remember voice commands on an Android mobile device. This work was implemented using the Atmega 328 microcontroller, Relays and a Wi-Fi shield. The human voice is first converted to text using a Natural language processing tool from the Android based application. Thereafter, the text is sent over the internet via the PubNub to the microcontroller. The Atmega 328 microcontroller was programmed on an Arduino using C programming language and the Android based application was developed using Android Software Development Kit. Results obtained from the testing show that the implemented system achieves the mean scores of 8, 7.6, and 7.2 for ease of use, learnability and effectiveness respectively justifying the fact that the system is capable of controlling appliances by changing their state (ON/OFF) from remote a location with a response time within the reasonable limit.
Conference papers on the topic "Remote relay testing"
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Apostolov, Alexander, and Benton Vandiver. "Remote maintenance testing of protection devices and schemes - why we need it and how we can do it?" In 2016 69th Annual Conference for Protective Relay Engineers (CPRE). IEEE, 2016. http://dx.doi.org/10.1109/cpre.2016.7914911.
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Taheri, Behrooz, Seyed Amir Hosseini, Hossein Askarian-Abyaneh, and Farzad Razavi. "A New Method for Remote Testing Distance Relay Using Internet Protocol Version 4." In 2019 International Conference on Protection and Automation of Power System (IPAPS). IEEE, 2019. http://dx.doi.org/10.1109/ipaps.2019.8641918.
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Goulkhah, M., and A. M. Gole. "Practical application of waveform relaxation method for testing remote protective relays." In 2015 IEEE International Conference on Industrial Technology (ICIT). IEEE, 2015. http://dx.doi.org/10.1109/icit.2015.7125290.
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Nybacka, Mikael. "Opportunities in Automotive Winter Testing." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87264.
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This paper aims to elaborate the challenges and possibilities in automotive winter testing in Sweden, in particular the use of fleet management framework and steering robots, which have shown to be an interesting area for future automotive winter testing. Data was collected from a number of interviews, workshops and surveys. Automotive manufacturers (OEMs), Tier 1 suppliers and service providers (e.g. test track owners and winter test entrepreneurs) contributed to the data collection. In general, service providers want to approach their customers in the value chain to provide new or extended services. From the data, the automotive industry is constantly pressed by shorter projects, fewer prototypes and the lack of state-of-the-art test methods. Service providers find the use of remote technologies, such as fleet management, an important part of their service, especially connected to the safety of test-drivers and overall test track safety. Service providers also consider further research in the area of fleet management and remote technologies as a base for future services. The automotive industry states that the possibility to replay the last run from logged data in the vehicle enhances the services. The use of steering robots during winter testing can provide an opportunity to run repeatable and standardized testing. However, the views here vary a lot between companies regarding the usability of the steering robots during winter testing. This indicates that further research on the issue of providing standardized winter testing is necessary. Work to extend a fleet management framework and a pre-study of the usability of steering robots in winter testing have begun, using the studies presented in this paper as a basis for this work.
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Landau, Stuart A., and Daniel J. Reitz. "Relays to Processors at the Port Authority Trans-Hudson." In 2013 Joint Rail Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/jrc2013-2424.
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The Port Authority Trans-Hudson (PATH) heavy-rail rapid-transit system has a two-decade history of using microprocessor-based equipment as replacements for electromechanical and electrical systems. Until recently, these processors were used for non-vital applications only, such as event recording and train dispatching. With the rebuilding of the World Trade Center terminal, processors were introduced for vital applications. PATH is now in the midst of a processor-based replacement of its entire signal system. Here we present a review of past, current and future applications of processor-based equipment at PATH. We examine the reasons for conversion and the advantages and disadvantages for design, installation and maintenance. A survey is made of equipment that is removed, added, replaced or retained for processor-based conversion. Interfacing with field appliances, including the continued use of relays for limited applications, is examined. With so much functionality concentrated within a single piece of equipment, new types of failure modes and redundancy become important considerations, as well as the volatility of critical information needed to maintain service. We also expose the problems of testing and cutover of new equipment on a railroad that operates passenger service 24 hours a day, 365 days a year, and training requirements of signal office staff and field forces. Since PATH is under FRA jurisdiction, use of processor-based equipment for vital applications is subject to additional regulations and we look at the programming accommodations for FRA testing.
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Martocchia, Francesco, Damien Deffieux, Nelson Obanor, Francesco Battaglia, Daniele Palumbo, Alessandro Rusconi, Giovanni Ricci, et al. "Lessons Learned and Achievements from a Successful Sand Control Campaign in Ultra-Deepwater Gas Wells, East Africa." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211568-ms.
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Abstract Success in deploying sand control systems is critical to guarantee the integrity of wells during their productive life. This is even more crucial when dealing with ultra-deepwater high-rate gas wells. This paper will describe the challenges and the lessons learned from the successful 2021 completion campaign of X field in East Africa in which six gas producer wells were completed with openhole gravel pack using shunt tubes technology in water depths ranging from 1840 m to 2149 m. The overall completion design philosophy was to rely on field-proven technologies and industry-accepted "best practices" to maximize safety and reliability. This objective was pursued in all phases of the project for timely completion of the wells while minimizing the chance of failure. Extensive testing on formation rock cores and completion fluids was performed before the start of drilling to identify the best sand control strategy and to avoid all potential issues such as formation damage or fluid incompatibility. State-of-the-art completion equipment was selected considering all potential contingencies associated with operations in an ultra-deepwater environment in a remote location. This document will describe the activities carried on during the different phases of the project: design, preparation, execution, and post-job interpretation. The goal of preventing solid production without impairing the well productivity was achieved successfully. This was confirmed from well testing interpretation where neglectable skin was detected. At the same time, it was possible to carry on the completion activities on time and on cost despite the remote location and the challenges related to the ultra-deepwater environment.
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P Wagoner, Mark, and Samuel Sambasivam. "A Cybersecurity Study: Examining the Relationship between Converged-Network Architecture and Remote Grassfire Alert Transmission Delay in Southeast Colorado." In InSITE 2022: Informing Science + IT Education Conferences. Informing Science Institute, 2022. http://dx.doi.org/10.28945/4991.
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Aim/Purpose: The purpose of the present study was to examine the relationship between a converged wireless-sensor/cellular network architecture and cybersecurity, in terms of transmission delay, to deliver remote grassfire alerts to firefighters in Southeast (SE) Colorado. Background: Agriculture, rural communities, a thriving cattle industry, and a kaleidoscope of flora and fauna characterize the plains of SE Colorado. Unfortunately, the hot and dry climate of SE Colorado combines with the ever-expanding wildland-urban interface (WUI), presenting an enormous grassland fire risk. A review of the literature revealed a deficit of research that addressed the alerting mechanism between remote WSN-based fire detection and response forces. Methodology: The present research pursued a converged-network solution from two courses of action (COA) to address the wildfire risk. COA-A and COA-B coupled the ZigBee-Pro and ZigBee-IP WSN protocols, respectively, with the 4G-LTE infrastructure prevalent throughout SE Colorado to bolster alert information availability. Following construction of the simulation models, the Ostinato packet generator performed 194 end-to-end transmissions with each COA to ascertain the better-performing solution in terms of network transmission delay. Contribution: The study’s findings offer a starting point for subsequent research that will lead to a proposal for SE Coloradans – and beyond – to help bridge the gap between detective WSNs and the response forces that can subdue remote grassfires. To the extent the authors could surmise, the current research effort was the first to model and simulate a one-way, UDP-based wireless network that comprised a WSN node, two WSN-Cellular gateway designs, and several 4G-LTE infrastructure components. The simulated environment also measured and compared the end-to-end network transmission delay for two unique solutions, including the convergence process within the WSN-Cellular gateway. Findings: COA-B proved the superior solution with a 16.2% delay improvement over COA-A. An independent-samples t-test confirmed the statistical significance between the results’ means. Recommendations for Practitioners: COA-B offered a remote SE Colorado grassfire alerting solution that minimized network transmission delay and maximized alert payload to responding firefighters. However, the generalizability of the current research’s results indicates utility for firefighters providing overwatch to grasslands throughout the world – wherever valuable grasslands intersect with a 4G-LTE on-ramp. Within the United States and outside SE Colorado, 4G-LTE from multiple carriers exists throughout the Great Plains. U.S. industries, communities, and ecosystems that rely on the abundance of Great Plains grasslands abound and feature use cases ripe for benefit from the present research. Recommendations for Researchers: Additional studies could offer more depth and recommend solutions to bolsters the alert mechanism between fire detection and response capabilities. The literature is teeming with research that improves the efficacy of fire-detective WSNs. However, the dearth of practice-oriented research that delivers an alert to firefighters in SE Colorado and elsewhere warrants further work on top of the present study. Impact on Society: The study’s findings need not apply only to grassfires. Much research and residual challenges exist on the topic of forest and wildfire alerts throughout the world. Although the generation mechanisms may differ, propelling an alert over available infrastructure – 4G-LTE or other – offers a workable solution to ensure timely response to unsolicited fires. Future Research: The current research’s incremental construction of delay measurements for COA-A and COA-B encourages the creation of an end-to-end model in network simulators such as NS3 or OMNeT++. A network simulation framework like OMNeT++ would allow a more comprehensive representation of wireless channel effects on overall delay. The creation and testing of a physical COA-B prototype would provide a proof of concept for the current study. Future work could bridge the gap between any varietal of remote sensor network and the audience that consumes sensor data anywhere in the world.
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Sánchez, D., B. Monje, R. Chacartegui, J. M. Barragán, E. Pajuelo, J. R. Gómez, and T. Sánchez. "Engineering a Pressurised Wind Tunnel Aimed at Developing CO2 Turbomachinery." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94007.
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The number of people researching the supercritical CO2 power cycle has largely increased in the last few years. Just to mention, in contrast to the one or two technical papers in the topic submitted yearly to Turbo Expo until 2011, the number of contributions in the topic has rocketed to twenty in the last conference held in Copenhagen. Such astounding and unexpected growth has eventually given rise to the International Gas Turbine Institute creating a new dedicated technical committee. Nevertheless, in spite of the large attention captured by the SCO2 power cycle, most efforts are devoted to the adaption of existing equipment (turbomachinery and heat exchangers) rather than to analysing the particular features of this unconventional working fluid. Hence, the test plants already in operation as well as the numerous CFD analyses under development rely on the existing ideal-gas based knowledge typically used by the gas turbine industry. This is the reason why the compressors in these test plants are far from their theoretical performance (typically 65% real vs. 80% theoretical efficiency). The partnership formed by the University of Seville and Altran has engineered a first-of-a-kind wind tunnel for aerodynamic testing of carbon dioxide flows at high pressure. This unique facility incorporates special features like new seals, variable pressure operation and remote data acquisition which cannot be adapted from conventional wind tunnels. This development is expected to provide the industry with a tool to increase the efficiency of SCO2 turbomachinery by large what would eventually allow for a faster and wider deployment of the technology. The university of Seville and Altran are currently raising capital to construct the facility.
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Madsen, Stian, Jørn Watvedt, and Lars E. Bakken. "Gas Turbine Fouling Offshore: Air Intake Filtration Optimization." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75613.
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Optimized operation of gas turbines is discussed for a fleet of eleven LM2500PE engines at a Statoil North Sea offshore field in Norway. Three engines are generator drivers while eight engines are compressor drivers. Several of the compressor drive engines run at peak load (T5.4 control), hence production rate is limited by the available power from these engines. The majority of the engines discussed run continuously without redundancy, hence gas turbine uptime is critical for the field’s production and economy. The performance and operational experience with upgraded inlet air filter systems, as well as successful operation at longer maintenance intervals and higher average engine performance are described. For North Sea operation, a key property of the filter system is the ability to handle high humidity and high salt-content, typical of the harsh environment in these waters. The upgraded filter system analyzed in this paper is a 2-stage system (vane separator stage upstream of the high-efficiency filter stage), which is a simplified design versus the old traditional 3-stage systems (louvre upstream and vane separator downstream of the filter stage). These 2-stage systems rely on an efficient upstream vane separator to remove the vast majority of water from the airflow before it reaches the high-efficiency filters. The high-efficiency filters are specially designed to withstand moisture. The effectiveness and contribution of each component in the filtration system are described. Extensive testing of both new and used filter elements, of different filter grade and operated at different intervals, has been performed in a filter test rig facility onshore. Extensive testing of used filters has also been performed at the filter OEM, where filter efficiency is measured as well as destructive testing and analysis of the filter layers. The effect of an optimized air intake filter system for the subject engines, is longer operating intervals, higher power availability and lower engine deterioration. The operating intervals are now extended to six months (4,000 hours), from initially two months (1,500 hours, early 1990s) then four months (3,000 hours, mid 2000s). The HPC efficiency deterioration is reduced by some 3% related to intake filter system, of a total of over 6% in efficiency deterioration over each 6-month operating period.
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Lall, Pradeep, Prakriti Choudhary, Sameed Gupta, and Jeff Suhling. "Condition-Based Assessment of Damage Progression During Mechanical Shock in Electronic Assemblies." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15450.
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Electronic products may be subjected shock and vibration during shipping, normal usage and accidental drop. High-strain rate transient bending produced by such loads may result in failure of fine-pitch electronics. Current experimental techniques rely on electrical resistance for determination of failure. Significant advantage can be gained by prior knowledge of impending failure for applications where the consequences of system-failure may be catastrophic. This research effort focuses on an alternate approach to damage-quantification in electronic assemblies subjected to shock and vibration, without testing for electrical continuity. The proposed approach can be extended to monitor product-level damage. In this paper, statistical pattern recognition and leading indicators of shock-damage have been used to study the damage initiation and progression in shock and drop of electronic assemblies. Statistical pattern recognition is currently being employed in a variety of engineering and scientific disciplines such as biology, psychology, medicine, marketing, artificial intelligence, computer vision and remote sensing [Jain, et. al. 2000]. The application quantification of shock damage in electronic assemblies is new. Previously, free vibration of rectangular plates has been studied by various researchers [Leissa 1969, Young 1950, Gorman 1982, Gurgoze 1984, Wu 2003] for development of analytical closed-form models. In this paper, closed-form models have been developed for the eigen-frequencies and mode-shapes of electronic assemblies with various boundary conditions and component placement configurations. Model predictions have been validated with experimental data from modal analysis. Pristine configurations have been perturbed to quantify the degradation in confidence values with progression of damage. Sensitivity of leading indicators of shock-damage to subtle changes in boundary conditions, effective flexural rigidity, and transient strain response have been quantified. A damage index for Experimental Damage Monitoring has been developed using the failure indicators. The above damage monitoring approach is not based on electrical continuity and hence can be applied to any electronic assembly structure irrespective of the interconnections. The damage index developed provides parametric damage progression data, thus removing the limitation of current failure testing, where the damage progression can not be monitored. Hence the proposed method does not require the assumption that the failure occurs abruptly after some number of drops and can be extended to product level drops.