Relevant bibliographies by topics / Lifetime structural node

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Lifetime structural node'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Lifetime structural node"

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Yao, Peng, Gang Liu, and Yan Liu. "Critical Event-Triggered Transmission for Wireless Sensor Node in Aircraft Structural Health Monitoring." Applied Mechanics and Materials 599-601 (August 2014): 856–59. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.856.

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The wireless sensor network represents an exciting development that has the potential to be integrated into an aircraft environment for structural health monitoring. Critical event-triggered transmission scheme were illustrated and applied to prolong the battery lifetime and balance the power-performance tradeoff. The experimental results show that the wireless sensor node using this technology is a powerful solution for aircraft SHM.
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Haque, Md Ershadul, Md Asikuzzaman, Imran Ullah Khan, In-Ho Ra, Md Sanwar Hossain, and Syed Bilal Hussain Shah. "Comparative Study of IoT-Based Topology Maintenance Protocol in a Wireless Sensor Network for Structural Health Monitoring." Remote Sensing 12, no. 15 (July 23, 2020): 2358. http://dx.doi.org/10.3390/rs12152358.

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A structural health monitoring (SHM) system is an approach for identifying the damages caused to various kinds of structures using different system functions and providing the necessary feedback about structure’s conditions. As civil structures are the backbone of our society, to determine its daily operations is a very important issue. The performance measurement of those structures is manual whereas a computer-based monitoring system could automatically assess the structural damages and identify its exact location. Recently, wireless sensor networks (WSNs) have attracted a great deal of attention for remote sensing applications due to flexibility to measure of various activity of large scale network. Since technology is advancing day by day, the overall cost of a monitoring system is also decreased. However, the major challenging fact of a WSNs is to provide scalability for covering a large area. The main question is arisen how much capable have of a monitoring system to turn off unnecessary nodes to save energy while there are no events detected. To support the scalability required of an existing network and save the node energy for future use, we propose a topology maintenance protocol integrated with construction to address the issue of a node’s energy consumption by placing it optimally and extending the monitoring system’s lifetime. As per the authors’ acknowledgement that, a little attention has been paid to developing such a hybrid approach. To mitigate node energy consumption issue with large scale support, an Internet of Things (IoT)-based maintenance approach is the best candidate for obtaining better system lifetime responses. Therefore, the main goal of this work is to develop an ‘on-the-fly’-based topology maintenance monitoring system, which can maintain a network’s infrastructure while gathering a node’s information to switch its state regularly when the present network is no longer optimal.
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Feltrin, Glauco, Nemanja Popovic, and Michał Wojtera. "A Sentinel Node for Event-Driven Structural Monitoring of Road Bridges Using Wireless Sensor Networks." Journal of Sensors 2019 (January 31, 2019): 1–16. http://dx.doi.org/10.1155/2019/8652527.

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Event-driven monitoring policies enable to significantly reduce the power consumption of wireless sensor networks by reducing the recording period to those time intervals that provide valuable data. The resulting longer operation lifetime increase discloses fields of application that require long monitoring periods. This paper presents a structural monitoring system that uses specialized sentinel nodes for detecting possibly heavy road vehicles and for alarming monitoring nodes, which are specialized on strain sensing. Heavy vehicles are identified by estimating nearly in real time height and length of vehicles of a traffic flow by processing data recorded from low-cost ultrasonic and magnetic displacement sensors. Field tests demonstrated that while height detection is very reliable, length detection is too imprecise to discriminate with high success rates between trucks and delivery vans.
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RYNIEWICZ, Anna M., Tomasz MADEJ, Wojciech RYNIEWICZ, Łukasz BOJKO, and Mieczysław CHOROMAŃSKI. "THE EFFECT OF THE COEFFICIENT OF FRICTION ON THE BIOMECHANICS OF CONTACT IN HIP ENDOPROSTHESIS." Tribologia 273, no. 3 (June 30, 2017): 137–46. http://dx.doi.org/10.5604/01.3001.0010.6245.

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Hip replacement surgery, by introducing a specific replacement head on the stem and cup, completely changes the conditions of co-operation typical for the biological correct pair. The clinical selection of endoprosthesis, apart from other conditionings, involves a dilemma between the choice of a rigid tribological node and the selection of a susceptible bearing cushioning the locomotive loads. The aim of the study is to evaluate the coefficient of friction and wear resistance of materials used for sliding contact in the endoprostheses of hip joints. On the basis of the conducted tests, it can be stated that, in the selection of material for cups of endoprosthesis, the wear resistance is important, and the coefficient of friction in contact head and cup in the prosthesis is less important. The presence of significant disproportions between the two parameters of the tribological process proves that the biomaterial is less useful on the cup. In the assessment of cooperation in the endoprosthesis, simulations of the contact of structural elements are useful, because, on that basis, in the correlation with tribological parameters, one can make conclusions about the distribution of stresses and displacements that may determine the lifetime of the implant.
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Et. al., Mr Pradeep K. G. M. "Energy Efficient Scheduling Algorithm for Structural Health Building Monitoring System(Shbm) to Increase the Battery Lifetime." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (April 11, 2021): 5005–12. http://dx.doi.org/10.17762/turcomat.v12i3.2014.

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A structural health building monitoring system is invented, achieved and attempted using Wireless Sensor Networks .Ambient vibration of the structure is audited and is implemented to identify the health status of the structure. With WSN, low cost monitoring is possible without intruding with the action of the structure. In this cluster head is heavily loaded since it gathers information from all other member nodes and integrate then and forward to sink either directly or through intermediate other cluster head. I near future cluster head drain and we need to select another cluster head via re clustering. The re clustering also led to energy loss to select the cluster head based on weight age value.WSN consumes less power and it is used to track slow targets .WSNs covers only small distance. WSN has high failure rate and we have to plant excessive nodes. Hence redundant nodes dissipate more power. To avoid this, sleep mode and scheduling algorithm is used in this paper. The objective of the paper is to design a scheduling algorithm to trace data with target rate. The proposed scheme is a kind of an adaptive/Cyclic on–off scheduling scheme in where sensors nodes use only local information to make scheduling decisions.
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Hajduk, A. "The past orbit of comet Halley and its meteor stream." International Astronomical Union Colloquium 83 (1985): 399–403. http://dx.doi.org/10.1017/s0252921100084086.

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AbstractThe present paper studies the structural features of the meteor streams associated with Comet Halley deduced from the observations of its meteor showers, as check points of orbital elements in a deeper history of the comet orbit. Libration of the argument of perihelion of the comet and the corresponding displacement of the nodes, as recognized in the distribution of condensations within the stream, allows to estimate the maximum lifetime of the comet in the inner Solar System at about 2 × 105 years.
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Colin, Xavier, Mouna Ben Hassine, and Moussa Nait-Abelaziz. "CHEMO-MECHANICAL MODEL FOR PREDICTING THE LIFETIME OF EPDM RUBBERS." Rubber Chemistry and Technology 92, no. 4 (October 1, 2019): 722–48. http://dx.doi.org/10.5254/rct.19.81469.

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ABSTRACT A chemo-mechanical model has been developed for predicting the long-term mechanical behavior of EPDM rubbers in a harsh thermal oxidative environment. Schematically, this model is composed of two complementary levels: The “chemical level” calculates the degradation kinetics of the macromolecular network that is introduced into the “mechanical level” to deduce the corresponding mechanical behavior in tension. The “chemical level” is derived from a realistic mechanistic scheme composed of 19 elementary reactions describing the thermal oxidation of EPDM chains, their stabilization against oxidation by commercial antioxidants but also by sulfide bridges, and the maturation and reversion of the macromolecular network. The different rate constants and chemical yields have been determined from a heavy thermal aging campaign in air between 70 and 170 °C on four distinct EPDM formulations: additive free gum, unstabilized and stabilized sulfur vulcanized gum, and industrial material. This “chemical level” has been used as an inverse resolution method for simulating accurately the consequences of thermal aging at the molecular (concentration changes in antioxidants, carbonyl products, double bonds, and sulfide bridges), macromolecular (concentration changes in chain scissions and cross-link nodes), and macroscopic scales (weight changes). Finally, it gives access to the concentration changes in elastically active chains from which are deduced the corresponding changes in average molar mass MC between two consecutive cross-link nodes. The “mechanical level” is derived from a modified version of the statistical theory of rubber elasticity, called the phantom network theory. It relates the elastic and fracture properties to MC if considering the macromolecular network perfect, and gives access to the lifetime of the EPDM rubber based on a relevant structural or mechanical end-of-life criterion. A few examples of simulations are given to demonstrate the reliability of the chemo-mechanical model.
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Dhage, Manisha R., and Srikanth Vemuru. "Routing Design Issues in Heterogeneous Wireless Sensor Network." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 2 (April 1, 2018): 1028. http://dx.doi.org/10.11591/ijece.v8i2.pp1028-1039.

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<p class="Default">WSN has important applications such as habitat monitoring, structural health monitoring, target tracking in military and many more. This has evolved due to availability of sensors that are cheaper and intelligent but these are having battery support. So, one of the major issues in WSN is maximization of network life. Heterogeneous WSNs have the potential to improve network lifetime and also provide higher quality networking and system services than the homogeneous WSN. Routing is the main concern of energy consumption in WSN. Previous research shows that performance of the network can be improve significantly using protocol of hierarchical HWSN. However, the appropriateness of a particular routing protocol mainly depends on the capabilities of the nodes and on the application requirements. This study presents different aspects of Heterogeneous Wireless Sensor network and design issues for routing in heterogeneous environment. Different perspectives from different authors regarding energy efficiency based on resource heterogeneity for heterogeneous wireless sensor networks have been presented.</p>
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Zlatuška, Karel, Jiří Stráským, and Radim Nečas. "Spatially Curved Cable-Supported Bridge Structures." Solid State Phenomena 259 (May 2017): 125–29. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.125.

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The article is focused on the design of spatially curved cable - supported footbridges, which represent a simple and elegant solution for bridging longer spans. It can be used independently or in a combination with other structural arrangements, e.g. with the arch structures.To verify the behavior of the structure, a several testing models were created. At first only simple, plan – straight models were created so the results could be checked by manual calculations. Latter, the more complex, curved models were tested. All models were designed and analyzed with the Ansys software using geometrically nonlinear calculations. The analysis consisted in the searching for ideal geometry of the supporting cable, cross section geometry of the bridge deck and other parameters, which are necessary to find a correct initial state of the structure. The main criterion for finding the initial state was a demand of minimal deformations in the strut - supporting nodes, which leads to the minimal redistribution of the internal forces during the design lifetime. The result of the paper is a detailed analysis of the construction’s behavior. The main emphasis is on methodology of search for the initial state. Further, the buckling analysis of the struts and cable were performed and it’s resistance to buckling was determined using various live load configurations.
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Srikanth*, P., S. Pallam Shetty, and K. Venkata Krishna R. "Taguchi Approach for Determining the Most Essential Aspect in Enhancing the RPL Performance." International Journal of Innovative Technology and Exploring Engineering 10, no. 10 (August 30, 2021): 59–63. http://dx.doi.org/10.35940/ijitee.j9412.08101021.

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Wireless Networks to support real time communication is a challenging issue due to limited bandwidth and limited energy. Internet a best-effort model with IPv4 have complication in handling the limited network connections. To prune the network connection problem IPv6 a QoS model has been incorporated. IPv6 implementation using internet over various devices/things connected wirelessly is Internet Of Things(IOT). RPL a routing protocol best suits for IOT communication needs to implement best effort model with ICMP highly adaptable for IPv4. A series of experiments have been conducted on Cooja simulator to analyse for enhancement for QoS parameters metric on RPL Routing Protocol. The experimental results yields that no of nodes, Tx Ratio, ICMP intervals and ICMP interval are four factor having an remarkable influence on the QoS Metric of RPL routing protocol. A Design of experiments have been conducted to an optimum level using the Taguchi approach to pick out the most influential factor among the four factors. Taguchi experimental analysis revealed that ICMP time interval as most significant factor for QoS metric in RPL routing protocol for minimizing the energy consumption and enhancing the network lifetime.
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Dissertations / Theses on the topic "Lifetime structural node"

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Adámek, Petr. "Kritéria hodnocení únavové životnosti nýtových spojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232022.

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This thesis describes proposal of a methodology for evaluating fatigue life of riveted joints. The first section summarizes the theory used to evaluate fatigue life, description of the structure of operation load spectra and construction principles for the design joints for optimum durability. The second part of the thesis focuses on the proposal of a methodology enabling analytical solutions in closed form suitable for the initial structural design and also numerical solutions for use in detailed analyzes of the structure. The applicability of the methodology is demonstrated on an example of analysis of a real structural detail and subsequent comparison of the analysis with available test results.
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Book chapters on the topic "Lifetime structural node"

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Meghanathan, Natarajan. "Impact of the Structure of the Data Gathering Trees on Node Lifetime and Network Lifetime in Wireless Sensor Networks." In Advances in Wireless Technologies and Telecommunication, 184–96. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0486-3.ch007.

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We analyze the impact of the structure of the Data Gathering (DG) trees on node lifetime (round of first node failure) and network lifetime (minimum number of rounds by which the network gets either disconnected due to node failures or the fraction of coverage loss reaches a threshold) in wireless sensor networks through extensive simulations. The two categories of DG trees studied are: the Bottleneck Node Weight-Based (BNW-DG) trees and Bottleneck Link Weight-Based (BLW-DG) trees. The BNW-DG trees incur a smaller diameter and a significantly larger fraction of nodes as leaf nodes: thus, protecting a majority of the nodes in the network from simultaneously being exhausted of the energy resources (contributing to a significantly larger network lifetime); nevertheless the nodes that serve as intermediate nodes in the first few instances of the BNW-DG trees are bound to lose their energy more quickly than the other nodes, leading to a smaller node lifetime compared to that of the BLW-DG trees (that incur a larger diameter and a relatively lower fraction of nodes as leaf nodes).
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Sarwesh, P., N. Shekar V. Shet, and K. Chandrasekaran. "Effective Integration of Reliable Routing Mechanism and Energy Efficient Node Placement Technique for Low Power IoT Networks." In Securing the Internet of Things, 344–63. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9866-4.ch019.

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Internet of Things (IoT) is the emerging technology that links physical devices (sensor devices) with cyber systems and allows global sharing of information. In IoT applications, devices are operated by battery power and low power radio links, which are constrained by energy. In this paper, node placement technique and routing mechanism are effectively integrated in single network architecture to prolong the lifetime of IoT network. In proposed network architecture, sensor node and relay node are deployed, sensor nodes are responsible for collecting the environmental data and relay nodes are responsible for data aggregation and path computation. In node placement technique, densities of relay nodes are varied based on traffic area, to prevent energy hole problem. In routing technique, energy efficient and reliable path computation is done to reduce number of re transmissions. To adopt IoT scenario, we included IEEE 802.15.4 PHY/MAC radio and IPv6 packet structure in proposed network architecture. Proposed work result shows, proposed architecture prolongs network lifetime.
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Jayakody, Nalin Dushantha Kumara, and Dang Khoa Nguyen. "Green Cognitive Relay Communications with Hardware Impairments for Future Wireless Networks." In Advances in Wireless Technologies and Telecommunication, 98–128. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2023-8.ch005.

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Wireless Power Transfer is a promising solution to increase the lifetime of wireless nodes and hence alleviate the energy bottleneck of energy constrained wireless networks. In this Chapter, we discuss two power transfer policies; dual-source and single fixed-source, two bidirectional relaying protocols; multiple access and time division broadcast, and two relay receiver structures; time switching and power splitting, are considered to derive closed-form expressions for the outage and throughput of the network in the context of delay-limited transmission. This framework assists the reader not only to quantify the degradation of outage probability and throughput of the networks due to the impairments of realistic transceiver but also to provide realistic insight into the effect of power transfer policies, relaying protocols and receiver structures on outage and throughput of the networks.
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Conference papers on the topic "Lifetime structural node"

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Sazak, Nukhet, and Mutlu Ertug. "The effect of node deployment scheme on LWSN lifetime for railway monitoring applications." In 2017 IEEE Workshop on Environmental, Energy, and Structural Monitoring Systems (EESMS). IEEE, 2017. http://dx.doi.org/10.1109/eesms.2017.8052692.

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Bárcena Pasamontes, Lucía, Fernando Gómez Torres, Daniel Zwick, Sebastian Schafhirt, and Michael Muskulus. "Support Structure Optimization for Offshore Wind Turbines With a Genetic Algorithm." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24252.

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This study considers the use of a genetic algorithm for the structural design optimization of support structures for offshore wind turbines. Member diameters, thicknesses and locations of nodes are jointly optimized. Analysis of each design is performed with a complete wind turbine simulation, for a load case in the time domain. Structural assessment is in terms of fatigue damage, evaluated for each joint using the hot-spot stress approach. This defines performance constraints. Designs are optimized with respect to their weight. The approach has been tested with the modified 4-legged UpWind jacket from the OC4 project. The weight is quickly reduced, convergence slows after about 100 iterations, and few changes occur after 250 iterations. Interestingly, the fatigue constraint is not active for any member, and it is the validity of stress concentration factors that determines the best design, which utilizes less than 90 percent of the available fatigue lifetime. These results of the preliminary study using the genetic algorithm demonstrate that automatic optimization of wind turbine support structures is feasible under consideration of the simplified load approach. Even for complex, multi-member structures such as the considered jacket a weight reduction was achieved.
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Natarajan, Shweta, Bobby G. Watkins, Vinod Adivarahan, Asif Khan, and Samuel Graham. "Thermal Characterization of Discrete Device Layers in AlxGa1−xN Based Ultraviolet Light Emitting Diodes." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75146.

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The temperature rise in LEDs is an important parameter that must be determined for both thermal management and device lifetime/reliability assessment. Commonly used indirect methods of measuring the device temperature either estimate the multiple quantum well (MQW) temperature based on measuring temperature dependent device characteristics (e.g., forward voltage and electroluminescence methods), or they measure the average temperature across the device structure using optical methods such as infrared (IR) thermography and thermoreflectance. However, none give true insight into the vertical distribution of temperature in these structures. In this study, Raman spectroscopy is applied for the first time to operating UV LEDs to give the temperature rise in discrete layers within the LED device structure, going from the growth substrate to layers adjacent to theMQWs. Comparisons are made with IR themography to contrast with this depth sensitive measurement technique. It was observed that the peak temperatures in the device were much higher than the temperatures indicated by IR while the averaged temperatures through the structure compared favorably. Additional comparisons to electroluminescence measurements were also made which compared favorably with the peak temperatures found by Raman Spectroscopy.
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Salminen, Pauli, Esa Ahlgren, and Petri Kuosmanen. "Mechanical and Thermal Engineering for High Temperature Fuel Cell Systems." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64236.

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Solid Oxide Fuel Cell (SOFC) systems achieve high electrical efficiency and can utilize many types of fuels such as methanol or biogas. These systems operate at high temperatures up to 600–1000 °C. Due to high temperatures, mechanical engineering must be combined with thermal engineering through the design work. System design for SOFC systems should take into account several functions such as mechanical support of components, thermal insulation, instrumentation, compensation for thermal expansion and heat recovery as well as conduction of gases through channels, piping or open cavities. One should note that many of these functions have strong interactions and cannot be designed without an effect on the system as a whole. When a system is designed to fulfill all the expectations, it will have a compact size, good thermal properties, small pressure losses and good overall performance together with a competitive price, long system lifetime and easy maintenance. This article aims to improve the mechanical structure of SOFC systems. In addition, our aim is to give sophisticated recommendations for a system design. To achieve this, we have used systematic concept development tools and methodologies to investigate the interactions and relative importance of system requirements and functions. Our key result from this study is that engineers must use a holistic approach when designing a high temperature system with strong interactions between system functions and components. Contrary to our former expectations, these systems could not be designed well by methods that are based on reductionism. In practice, this means that thermal engineering must be utilized from the very beginning. Thermal insulation concept should be selected during the first design steps since this has a great effect on system layout. Mechanical engineering is needed in system layout design in order to solve problems related to the thermal expansion and support of components. Combined thermal and structural analysis utilizing finite element methods can be used to develop or optimize mechanical key components and system layout. The best results can be achieved by using a holistic approach during the design process. In addition, it is beneficial to keep the system as simple and compact as possible. To achieve this, the integration of functions and components must be increased. Thus, SOFC system performance is greatly dependent on system design, not only of its components alone. Findings obtained from this study can be used by researchers designing experimental apparatuses or by companies manufacturing full scale SOFC systems.
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