Relevant bibliographies by topics / Mechanical rack

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Mechanical rack'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Mechanical rack"

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Men, Zheng Xing, Ya Xin Ma, Tai We Yue, and Rui Lin Liu. "Analysis on the Free Forging Process of the Heavy Rack for Ship Lift." Applied Mechanics and Materials 865 (June 2017): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amm.865.105.

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Heavy racks are the main load-bearing components and play more important position in great engineering equipments. Along with the requirement of the equipment efficiency promotion, the large-scale trend of rack is obvious. Among them, the rack for the Chinese Three Gorges ship lift total up to 5000mm. At present, the large rack mainly made by casting. Compared with the casting, the forging rack can greatly improve the mechanical properties and the service life. The aim of this work is feasibility analysis of free forging for large rack, as large T-shape section forging. Four possible forging schemes were simulated and compared by the finite element method, and the possible defects of all the schemes and their application scope were explored. Finally, it was proved that the free forging of heavy rack was realized by simple dies.
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Fulpagare, Yogesh, Yogendra Joshi, and Atul Bhargav. "Rack level transient CFD modeling of data center." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 2 (February 5, 2018): 381–94. http://dx.doi.org/10.1108/hff-10-2016-0426.

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Purpose The paper aims to capture the rack-level thermal dynamics in data center. It proposes the rack-level response experiments as well as transient Computational Fluid Dynamics (CFD) analysis to characterize the local thermal environment of the system. Design/methodology/approach A single sever simulator rack and its two neighboring racks with its cold and hot aisle containment have been modeled with known cold air supply temperature and flow rate for transient CFD analysis. The heat load was kept constant initially and varied case-to-case basis, which includes capturing the rack-level response with respect to changes in input. However, the response experiments on simulator rack were performed for 14 h by variation of server heat loads as step and ramp input. Findings The paper provides the detailed transient CFD analysis of data center racks. The local cold air flow rates and temperature at the vicinity of the racks showed significant effect due to changes in input. It was concluded that the rack-level dynamics impacts the thermal environment of data center and hence cannot be ignored. Research limitations/implications The high computing devices and faster internet demands have led to major thermal management concerns for data center operators. To tackle this issue, capturing the system thermal dynamics is imperative. However, the system-level CFD analysis is computationally expensive. Therefore, this paper deals with the rack-level transient CFD study using commercial tool STAR CCM+. Practical implications This paper includes the modeling of the servers as a porous media as well as the multigrid method to enhance the computational speed. The successful implementation of this approach validated through experiments. This would help to establish a base for research in any type of data center. Originality/value This paper provides the porous media approach to model servers and multigrid method to enhance the computational speed. At the same time, the thought of characterizing the local dynamics at the vicinity of data center racks is unique.
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Reddy, Dr Chanda V. "IOT Based Ambulatory Bag Mechanical Ventilator." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 1435–39. http://dx.doi.org/10.22214/ijraset.2021.37526.

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Abstract: The IoT-based Ambu bag mechanical ventilator is a ventilator that automates the process of hand press mechanism using the rack and pinion mechanism. The circulatory motion of the rack is converted into linear motion which helps to press the Ambu bag. The proposed project works on three modes of operation that is child-adult and elder which is set wrt to the breaths per minute. There are two states of operation one normal state where the normal working is evidenced whereas the other operation mode is emergency where the buzzer is themed on in case of emergency. All the parameters are displayed on LCD and connected to the IoT cloud to communicate remotely in the end device Keywords: Ambulatory Bag, IoT network, Rack and Pinion mechanism, Manual resuscitator, mechanical ventilators
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Yang, Hsueh-Cheng, and P. Frank Pai. "Kinematic performance of a parabolic gear tooth with two parabolic coefficients." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 23 (September 14, 2016): 4431–40. http://dx.doi.org/10.1177/0954406216668205.

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This paper presents design imaginary skew rack cutters having teeth of two parabolic coefficients to generate spur and helical gears. First, a mathematical model of the imaginary rack cutter having teeth of two parabolic coefficients is derived using geometric relations and coordinate transformation. After the relationship between the coordinate system of the imaginary rack cutter and that of the helical gear pair is set up, a family of imaginary rack cutter surfaces is obtained using the homogeneous coordinate transformation matrix to transfer the coordinate system of the rack cutters to that of the helical gear. Based on the gear theory, the equations of meshing between the rack cutter and the helical gear are determined. Substituting the equations of meshing into the family of imaginary rack cutter surfaces, a pinion and a gear are generated and their geometries are plotted using an in-house software package. Based on the assembly errors, tooth contact analysis is performed to determine the influences of kinematic assembly errors and the parabolic coefficients. Results show that maximum parabolic coefficient value of the imaginary skew rack cutter exists in order to avoid undercutting and it can be determined.
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Hou, Shun Li, Hai Yan Yang, and Xiong Bo Su. "Mechanical Property Analysis of the Frame of Papermachine Dry Section Based on Finite Element Method." Advanced Materials Research 524-527 (May 2012): 3896–99. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.3896.

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This essay analyses the mechanical behavior of the paper machine drying section rack by FEA method, obtaining transformation and stress distribution of the rack under static loading, so as to achieve the natural frequency and the corresponding strain, stress of the rack. This paper could provide theoretical foundation for design, fault diagnosis or reforming speed acceleration.
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Brown, Alan S. "Too Hot for Comfort." Mechanical Engineering 128, no. 12 (December 1, 2006): 32–34. http://dx.doi.org/10.1115/1.2006-dec-3.

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Electronics have grown much hotter over the past decade, making cooling a top priority in data centers. APC, better known for backup power supplies, supplies cold air from rack-size towers mounted along each row. It then monitors server temperatures, adjusting each individual air conditioner tower to achieve optimal cooling. Such localized cooling is efficient, such that users can boost server rack power to 18 kW—nearly nine times the average found by Uptime. IBM believes even the largest, most sophisticated data center managers need help with cooling. Like APC, it encloses its racks with a roof, but unlike APC it uses a cold rather than hot center aisle and exhausts the heated air into the data center. IBM also removes heat with a water-cooled heat exchanger attached to the back of a rack. In addition, IBM provides power management software that enables IT managers to adjust power and heat output. This ensures that power managers can power down based on workload, or move workload to environments that are not effectively using the power and cooling capacity that they have.
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Gusella, Federico, Maurizio Orlando, Andrea Vignoli, and Klaus Thiele. "Flexural Capacity of Steel Rack Connections Via The Component Method." Open Construction and Building Technology Journal 12, no. 1 (May 23, 2018): 90–100. http://dx.doi.org/10.2174/1874836801812010090.

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Background: In pallet rack structures, cold-formed steel (CFS) beams and columns are connected through dry joints, so beams can be easily disconnected according to changes of the rack geometric layout. Due to the great variety of connector types and member geometries, recent design codes recommend experimental tests on rack connections to assess their mechanical features. Nevertheless, tests only allow for the overall response of a joint to be evaluated, without providing information about the contribution of each component of the joint to its stiffness and strength. Objective: In this paper, a mechanical model is developed in order to provide useful information about the structural behaviour of rack beam-column connections. Methods: The proposed mechanical model is based on the application of the Component Method (CM) and it allows for the flexural resistance of steel rack connections to be analytically assessed. Analytical results are compared with experimental data from tests performed at the Structures and Materials Testing Laboratory of the Department of Civil and Environmental Engineering of Florence. Results: Results show a good agreement with experimental data, highlighting the accuracy of the proposed approach. The mechanical model allows for the weakest component of the joint and its failure mode to be evaluated, and it highlights the importance of an adequate welding between the beam-end section and the connector. Conclusion: The mechanical model provides fundamental information about the influence of structural details on the overall behavior of rack joints, it appears as a complementary method to expensive experimental tests and it can be used to improve the design of rack connections with the goal to increase their structural response.
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Blatnická, Mária, Milan Sága, and Miroslav Blatnický. "Design and strength analysis of mechanical rack system." MATEC Web of Conferences 254 (2019): 01017. http://dx.doi.org/10.1051/matecconf/201925401017.

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The paper deals with a construction design of the rack system which will be used for storage of metallurgical rod material in a manufacturing engineering company. To meet requirements for manual control of the pull-out mechanism it will be determined the force exerted by the worker on the hand crank required to pull in and pull out the racking system at the full load. In addition, stress analysis was conducted by means of finite element method.
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Antypas, Imad R., and Alexey G. Dyachenko. "Modeling, Studying and Manufacturing a Cultivator Rack from Composite Materials." Mordovia University Bulletin 28, no. 3 (September 20, 2018): 366–78. http://dx.doi.org/10.15507/0236-2910.028.201803.366-378.

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Introduction. The composite materials have not been widely used in the Russian economy (especially in agriculture) until recently. It is relevant to use them for manufacturing some parts of agricultural machinery, for example, racks of cultivator paws. These parts often break down because of stress concentration in the places where their thickness changes during the time of plowing. The stress can be decreased by using com- posite materials. Materials and Methods. This paper presents the study results on the use of composite materials for manufacturing of cultivator racks with the appropriate selection of the volume ratio of fibers in each of the layers of fabric and layers of binder. Results. Based on the results, the design safety factor was calculated to be equal to 2. It should be noted that the values of the mechanical characteristics of the material changed because of the presence of a porosity coefficient, which was 11.6 %, while the allowable value was 4%. Field tests have shown the durability of a new composite material, even under severe operating conditions, compared to a conventional rack made of alloy steel. Conclusions. Studying the mechanical behavior of the rack geometric model and modeling a material with high mechanical properties, which later was used for manufacturing a composite material, we could get the minimum safety factor of 4, with the maximum safety factor for workers – 15. The racks from composite material are economically feasible as less expensive than used steel racks.
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Yang, Hsueh-Cheng, and Wen-Jun Liang. "A helical gear with discrete ring-involute teeth." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 8 (December 15, 2019): 1554–68. http://dx.doi.org/10.1177/0954406219893392.

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This study produces a skewed-imaginary planar rack cutter with discrete conical teeth that is used to create a helical gear with discrete ring-involute teeth. A mathematical equation for the skewed-imaginary rack cutter with discrete conical teeth is firstly solved. The coordinate system for the rack cutter and gear pair is then established and a family of the rack-cutter surfaces is obtained using homogeneous coordinate transformation. The relative velocity method is used to produce the equation for meshing between the rack cutter and the gear pair. Substituting the equation of meshing into the family of the rack-cutter surfaces gives the mathematical models for the gear pair with discrete ring-involute teeth. The transmission error for the gear pair is calculated using the assembly error and a tooth contact analysis. A computer-aided design software package is used to establish solid model for the gear pair. A software interference function is used to simulate the contact condition for the gear pair for various assembly errors. Finite element analysis software is then used to determine the contact stress for the gear pair. The transmission error and the contact stress for the gear pair are insensitive to any horizontal misalignment in the assembly errors.
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Dissertations / Theses on the topic "Mechanical rack"

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Andersson, Tim, and Alexander Sjödin. "Smart Bike Rack : A Conept Study." Thesis, Jönköping University, JTH, Industriell produktutveckling, produktion och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54051.

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Thule Sweden AB is a company that develops products to facilitate people's adventures. The companyfocuses on various transport solutions where products are offered in four product categories which areSports and Cargo Carriers, Active with Kids, RV Products and Packs, Bags and Luggage. Thecategories consist of everything from roof racks, roof boxes, bicycle carts and strollers to tents for RVsand caravans and backpacks for everyday life.A problem that Thule Sweden AB has identified is the limited opportunity to bring important objectswith you on your bike. The pursuit of a possible solution would, in the company's opinion, be a newconcept for transport where a bicycle could be used. This is due to an increase in the number ofcyclists in all possible areas. With an increasing number of cyclists, new needs and problems alwaysarise at the same time as the company wants to explore a potential development of the existingpackage holder "Tour Rack" in the product collection. The result of the new concept would mean thatit would be integrated with the package holder, where new transport options could be created.The report covers the steps taken to find a solution to enable the transport of objects that have beenidentified as difficult to carry on a bicycle. This has been done with the help of a product developmentprocess where a lot of focus has been on the customer's wishes and needs. Initially, a boot camp wasconducted to identify the target group and possible objects that cyclists considered difficult to bring.This step led to the establishment of a requirements- and function specification, which was the basisfor the generation of several different concepts. The concepts were eliminated and decisions onfurther development were made where one concept was considered to be the best according to theboot camp. The concept was developed step by step and verified using physical prototypes and tests.The tests consisted of assembling manufactured prototypes with the desired objects, which were thenintegrated with the package holder. This was done to ensure the function of the concept.Through this process, the study resulted in a concept where an H-shaped geometry is integrated withthe package holder "Tour Rack". The concept has three integration points in form of screws thatenable an easy mounting process and a functionally stable concept for transport. Securing of objectstakes place by the user tightening two straps over the placed object which attaches softly between tworubber surfaces.
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Colpa, Bekir Onur. "Correlation Based Thermal Design Of Air Transport Rack Chassis." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613517/index.pdf.

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In this thesis, a Thermal Model Tool (TMT) is developed for standard Avionic Transport Rack (ATR) chassis and thermal design of a standard ATR chassis is done using developed TMT. This ATR chassis is a Digital Moving Map (DMAP) of a helicopter and the tool is used to determine the cooling channel details of DMAP. TMT decreases design process steps and eliminates the complexity of the design. Experimental studies are conducted on one of the existing chassis produced in Aselsan Inc. for different operating conditions. There are two different operating conditions for the chassis as 25 º
C and 55 º
C, which are given, in military standard MIL-STD-810F. Critical temperature values are measured, which are used in analytical calculations, and results are represented. At the first step, outputs of the experimental studies are used in analytical calculation in order to develop TMT. Secondly, heat dissipation rate of two different chassis are v calculated easily by using the TMT, and without making effort for CFD analysis, the necessary number of plate fins of the chassis are assessed considering given geometrical constraints and heat loads. Finally, cooling channels are generated using the results of TMT. In the next step the chassis, which are designed using the results of TMT, are analyzed numerically by using Icepak Computational Fluid Dynamics (CFD) tool and results of TMT are verified. The cooling capacities of the decided plate fins, which are obtained by TMT, are checked whether or not the required heat dissipation rates are ensured. Consequently, TMT is tested under for two different operating conditions on two different chassis. Analytical and numerical studies for both conditions are compared and discussed in detail. Comparisons show that, developed TMT results are meaningful and close to numerical results, therefore TMT can be used in forthcoming ATR chassis designs.
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Žemlička, Martin. "Mechanické shrabovací česle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228409.

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This diploma thesis deals with construction concept of mechanical rake screen and consists of several main sections. The first section of the diploma thesis covers an overview of the current supply of mechanically scraping rack. In the second section, basic parameters and calculations are solved for the mechanical rack construction concept. In the third one however, analysis of the construction is realized with SolidWorks modeller and the functions of particular parts of the rack is explained. The last section of the diploma thesis focuses on stress control using classic calculation methods and Finite Element Methods (FEM) using a program called I-DEAS.
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Čejda, Robert. "Mechanický čistící stroj." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228408.

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The aim of my diploma thesis is to design a construction of a mechanical fine rack cleaner machine including an appropriate design of gear mechanism and its attachment to the frame. The cleaner machine is located in the inflow system of a turbine in front of the object of small hydro power station. The design of the construction of the cleaner machine will be based on a drawing documentation and a report with needed analytic and FEM calculations.
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Gusella, Federico Verfasser], Klaus [Akademischer Betreuer] [Thiele, and Maurizio [Akademischer Betreuer] Orlando. "On the mechanical behavior of steel rack connections and its influence on the seismic response of industrial storage systems / Federico Gusella ; Klaus Thiele, Maurizio Orlando." Braunschweig : Technische Universität Braunschweig, 2021. http://d-nb.info/1225038286/34.

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Gusella, Federico [Verfasser], Klaus [Akademischer Betreuer] Thiele, and Maurizio [Akademischer Betreuer] Orlando. "On the mechanical behavior of steel rack connections and its influence on the seismic response of industrial storage systems / Federico Gusella ; Klaus Thiele, Maurizio Orlando." Braunschweig : Technische Universität Braunschweig, 2021. http://d-nb.info/1225038286/34.

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Ramanathan, Arun Kumar Kumar. "Dynamic response of a shipping container rack and suspended automotive parts under random excitation: Experimental, Computational and Analytical Studies." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492093294208549.

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Leishman, Robert C. "Applications of Variation Analysis Methods to Automotive Mechanisms." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2192.

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Variation analysis, or tolerance analysis as it is sometimes called, is typically used to predict variation in critical dimensions in assemblies by calculating the stack-up of the contributing component variations. It is routinely used in manufacturing and assembly environments with great success. Design engineers are able to account for the small changes in dimensions that naturally occur in manufacturing processes, in equipment, and due to operators and still ensure that the assemblies will meet the design specifications and required assembly performance parameters. Furthermore, geometric variation not only affects critical fits and clearances in static assemblies, it can also cause variation in the motion of mechanisms, and their dynamic performance. The fact that variation and motion analysis are both dependent upon the geometry of the assembly makes this area of study much more challenging. This research began while investigating a particular application of dynamic assemblies - automobiles. Suspension and steering systems are prime examples dynamic assemblies. They are also critical systems, for which small changes in dimension can cause dramatic changes in the vehicle performance and capabilities. The goals of this research were to develop the tools necessary to apply the principles of static variation analysis to the kinematic motions of mechanisms. Through these tools, suspension and steering systems could be analyzed over a range of positions to determine how small changes in dimensions could affect the performance of those systems. There are two distinct applications for this research, steering systems and suspension systems. They are treated separately, as they have distinct requirements. Steering systems are mechanisms, for which position information is most critical to performance. In suspension systems, however, the higher order kinematic terms of velocity and acceleration often are more important than position parameters.
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Perejda, Michal. "Hydraulické shrabovací česle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230545.

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This diploma thesis Hydraulic rake screen deals with the design of the hydraulic screen cleaning device with a stroke of 1800 mm, which will be placed in 1000 mm wide flow chanell of the wastewater treatment facility. This paper contains structural optimalization of the structure due to operating conditions and loads, mechanical strength calculations and drawings of the device and its details.
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Öberg, Daniel. "Utveckling av ett cykelskåp anpassat för stadsmiljö." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-16991.

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Projektet började som en öppen fråga i samarbete med ett konsultföretag inom produktutveckling att utveckla en säkrare parkering för cyklar. Det utfördes därför en omfattande förstudie för att utvärdera cykelvärlden och se potentiella utvecklingsmöjligheter hos olika typer av cykelparkeringar. Blidsberg mekaniska är ett företag som tillverkar cykelparkeringar och andra sorts produkter för utemiljöer. De involverades i arbetet och ville utöka sitt sortiment med ett nytt cykelskåp. Designprocessen började med en bred marknadsundersökning för att analysera befintliga cykelparkeringar i en förstudie. Under förstudien samlades även behov in som sedan skapade en kravspecifikation. Det kreativa arbetet i att utveckla ett nytt cykelskåp tog hjälp av olika kreativitetsmetoder som genererade flertalet koncept som sedan jämfördes i en matris. Ett vinnande koncept framställdes och kunde konkurrera med en redan befintlig lösning. Resultatet blev en kombination av redan befintliga lösningar. Cykelskåpet tar inte upp mer plats än behövligt för att de flesta cyklar ska få plats. Skåpet är modulanpassat och kan därför placeras mer platseffektivt på olika platser. En ljusindikation på handtaget visar om skåpet är ledigt eller upptaget och öppnas med en tagg som skannas på en RFID-läsare.
The project began as an open question in collaboration with a consulting company in product development to develop a more secure parking for bicycles. Therefore, a comprehensive feasibility study was performed to evaluate the bicycle values and to see potential development opportunities for different types of bicycle parking. Blidsberg mekaniska is a company that manufactures bicycle parking and other types of outdoor environment products. They were involved in the work and wanted to expand their range with a new bike box. The designprocess started with a marketreasearch with the aim to analyze cycle parks in a pre-study. During the pre-study demands was researched and formed a requirement specification. The creative work in the development of a new cycle park was helped by many creative methods that generated many concepts that later was compared in a matrix. The final concept was able to compete with the existing solutions. The result was a combination of already existing solutions. The bicycle locker does not take up more space than is necessary for most bicycles to fit in. The bicycle locker is modularly adapted and can therefore be placed more space efficiently in different places. A light indication on the handle indicates whether the bicycle locker is free or occupied and opened with a tag that is scanned on a RFID-reader.
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Books on the topic "Mechanical rack"

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Race car engineering & mechanics. 2nd ed. Seal Beach, Ca: P. Van Valkenburgh, 1986.

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Race car engineering and mechanics. Seal Beach, Calif: Paul Van Valkenburgh, 2000.

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Schröder, Jörg, and Patrizio Neff, eds. Poly-, Quasi- and Rank-One Convexity in Applied Mechanics. Vienna: Springer Vienna, 2010. http://dx.doi.org/10.1007/978-3-7091-0174-2.

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Schröder, Jörg. Poly-, quasi- and rank-one convexity in applied mechanics. Wien: Springer, 2010.

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Parks, Jeff. Win from the back: The memoirs of a race car mechanic. Bloomington, IN: AuthorHouse, 2011.

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Walker, James L. Thermographic qualification of graphite/epoxy instrumentation racks. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Guthrie, Julian. The billionaire and the mechanic: How Larry Ellison and a car mechanic teamed up to win sailing's greatest race, the America's Cup. New York: Grove Press, 2013.

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Ideal citizens: The legacy of the civil rights movement. Albany, N.Y: State University of New York Press, 1993.

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IUTAM Symposium on Multi-Functional Material Structures and Systems (2008 Bangalore, India). IUTAM Symposium on Multi-Functional Material Structures and Systems: Proceedings of the IUTAM Symposium on Multi-Functional Material Structures and Systems, Benguluru, India, December 10-12, 2008. Edited by Dattaguru B, Gopalakrishnan S, Aatre Vasudev K, and International Union of Theoretical and Applied Mechanics. Dordrecht: Springer, 2010.

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Race Car Engineering & Mechanics. HP Trade, 2004.

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Book chapters on the topic "Mechanical rack"

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Kumar, Bateendra, Mukul Yadav, Navneet Meena, and Rajiv Chaudhary. "Power Generation at the Security Check Point Gate Using Rack and Pinion Arrangement." In Lecture Notes in Mechanical Engineering, 663–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9678-0_57.

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Majtényi, József, Viktor Kárpáti, Márton Benke, and Valéria Mertinger. "Comparative Destructive and Non-Destructive Residual Stress Measuring Methods for Steering Rack Bar Semi-Product." In Lecture Notes in Mechanical Engineering, 59–68. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51189-4_6.

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Phillips, Jack. "Mechanics of the Phantom Rack." In General Spatial Involute Gearing, 335–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05302-7_13.

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Pepe, Marco. "Predicting the Mechanical Properties of RAC." In A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications, 121–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26473-8_7.

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Sangli, Mohan, and Anish Ravishankar. "Rank Aggregation Approach to Feature Selection for Improved Model Performance." In Lecture Notes in Mechanical Engineering, 309–16. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5432-2_27.

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Farinella, Paolo, and Bruno Bertotti. "Orbital Mechanics and Military Satellites." In The Arms Race in the Era of Star Wars, 272–83. London: Palgrave Macmillan UK, 1988. http://dx.doi.org/10.1007/978-1-349-06988-0_14.

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Poonawala, Taha Y., Parth D. Shah, and Salim A. Channiwala. "Potential Use of Low-Rank High-Ash Indian Coals Through Gasification Route." In Lecture Notes in Mechanical Engineering, 315–24. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5996-9_24.

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Betten, J., and W. Helisch. "Integrity Bases for a Fourth-Rank Tensor." In Solid Mechanics and Its Applications, 37–42. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8494-4_5.

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Grasedyck, Lars, and Christian Löbbert. "Parallel Algorithms for Low Rank Tensor Arithmetic." In Advances in Mechanics and Mathematics, 271–82. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-02487-1_16.

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Zhao, X., L. Dai, and C. Ren. "Review on recent research on rack structures in China." In Insights and Innovations in Structural Engineering, Mechanics and Computation, 1045–49. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-172.

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Conference papers on the topic "Mechanical rack"

1

Fulpagare, Yogesh, Yogendra Joshi, and Atul Bhargav. "Transient Characterization of Data Center Racks." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66870.

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The increased computational and storage demand has increased the heat dissipation of servers in data centers. The flow inside the data center is highly dynamic due to various parameters such as server workload, server fan speed, tile porosity, Computer Room Air Conditioning (CRAC) air flowrates, CRAC supply & return air temperatures and data center cold & hot aisle arrangements. Data center facility level transient CFD analysis was reported in recent literature which needs weeks to accomplish the computation. Hence, such facility level simulations are difficult to achieve with good accuracy. The main contributions of this paper are transient experiments, transient CFD model & transient effects on thermal and flow field due to variation in server load of server rack inside the raised floor plenum data center. In the current study we have developed a transient CFD model of three racks in a raised floor plenum data center room with cold and hot aisle containment based on experiments. The middle 42U (1U = 4.45 cm) rack houses four server simulators each having height of 10U. The flow tiles supply the cold air as inlet with average velocity of 1.53 m/s at 17°C. All the rack servers were modelled with 75% porosity and estimated thermal mass Each server simulator was assigned a total heat dissipation of 2500 W, with a total heat load of 10 kW per rack. The effect on rack inlet and outlet air temperatures were monitored by providing server heat loads as step & ramp inputs to the middle simulator rack. The results show that the rack level transient effects are significant and cannot be ignored.
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Johnson, David H., Robert J. Michael, Michael C. Pollino, Joseph D. Redovan, Eric E. Moser, and Blake A. Macdonald. "Development of a Seismic Isolation System for Commercial Storage Racks." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89112.

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This paper provides an overview of an analysis performed on a new base isolation system developed for seismic isolation of steel pallet storage racks. Pallet storage racks are often found in warehousing for material storage and are designed to store materials on pallets in horizontal rows with multiple levels which are accessed by forklift trucks. The new isolation system provides seismic isolation in the cross-aisle direction by incorporating heavily damped elastomeric bearings (referred to here as seismic mounts) and low-friction bearing plates. The objective of the base isolation system is to reduce horizontal accelerations of the rack to eliminate product shedding and structural damage during a major earthquake without interfering with normal, day-to-day material handling operations. The paper presents a summary of numerical results (transient structural, finite element analysis simulation) comparing storage rack response against actual tests performed on a triaxial shake table in the Structural Engineering and Earthquake Simulation Laboratory (SEESL) at the University at Buffalo (see Filiatrault[1] et al. 2008 for comprehensive test details). The simulation model was then used to determine a set of optimal seismic isolation parameters that satisfy the practical range of rack shelf loads and configurations that can be expected in typical warehouse and store installations.
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Schmidt, Roger, and Ethan Cruz. "Raised Floor Computer Data Center: Effect on Rack Inlet Temperatures When High Powered Racks are Situated Amongst Lower Powered Racks." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39652.

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This paper focuses on the effect on inlet rack air temperatures when high-powered racks are situated amongst lower powered racks in a raised floor data center. Only the above floor (raised floor) flow and temperature distributions were analyzed for various flowrates exhausting from the perforated tiles and with one or two high powered racks placed at various locations amongst the lower powered racks. A Computational Fluid Dynamic (CFD) model was generated for the room with electronic equipment installed on a raised floor with particular focus on the effects on rack inlet temperatures of these high powered racks. Forty racks of data processing (DP) equipment were arranged in rows in a data center cooled by chilled air exhausting from perforated floor tiles. The chilled air was provided by four A/C units placed inside a room 12.1 m wide × 13.4 m long. Since the arrangement of the racks in the data center was symmetric only one-half of the data center was modeled. The numerical modeling was performed using a commercially available finite control volume computer code called Flotherm (Trademark of Flomerics, Inc.). The flow was modeled using the k-e turbulence model. Results are displayed to provide some guidance on the design and layout of a data center.
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Nazir, Kamran, Naveed Durrani, Imran Akhtar, and M. Saif Ullah Khalid. "Numerical Study to Analyze the Effects of Hot/Cold Aisle Configurations on Heat Transfer Phenomenon in a Data Center." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64457.

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Due to high energy demands of data centers and the energy crisis throughout the world, efficient heat transfer in a data center is an active research area. Until now major emphasis lies upon study of air flow rate and temperature profiles for different rack configurations and tile layouts. In current work, we consider different hot aisle (HA) and cold aisle (CA) configurations to study heat transfer phenomenon inside a data center. In raised floor data centers when rows of racks are parallel to each other, in a conventional cooling system, there are equal number of hot and cold aisles for odd number of rows of racks. For even number of rows of racks, whatever configuration of hot/cold aisles is adopted, number of cold aisles is either one greater or one less than number of hot aisles i.e. two cases are possible case A: n(CA) = n(HA) + 1 and case B: n(CA) = n(HA) − 1 where n(CA), n(HA) denotes number of cold and hot aisles respectively. We perform numerical simulations for two (case1) and four (case 2) racks data center. The assumption of constant pressure below plenum reduces the problem domain to above plenum area only. In order to see which configuration provides higher heat transfer across servers, we measure heat transfer across servers on the basis of temperature differences across racks, and in order to validate them, we find mass flow rates on rack outlet. On the basis of results obtained, we conclude that for even numbered rows of rack data center, using more cold aisles than hot aisles provide higher heat transfer across servers. These results provide guidance on the design and layout of a data center.
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Kumar, Pramod, Vikneshan Sundaralingam, Yogendra Joshi, Michael K. Patterson, Robin Steinbrecher, and Marissa Mena. "Effect of Supply Air Temperature on Rack Cooling in a High Density Raised Floor Data Center Facility." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65574.

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In this paper we experimentally investigate the effect of supply air temperature on rack cooling in a high density raised floor data center facility. A series of experiments are performed on a 42 U (1-U = 4.45 cm) rack populated with 1-U servers. Desired rack heat loads are achieved by managing the distribution of server compute load within the rack. During the present experiments, temperatures at various locations in the hot and cold aisle corresponding to the rack air inlet and outlet are recorded. The temperatures are measured using a grid consisting of 256 thermocouples. The temperature measurements are further complimented with the flow field at the rack inlet. Particle Image Velocimetry (PIV) technique is used to capture the flow field at the rack inlet. The temperature maps in concert with the PIV flow field help in quantifying the rack cooling effectiveness. The temperature and flow measurements are measured for various cases by altering the supply air temperatures and perforated tile flow rates. The results are analyzed and compared with the ASHRARE recommended guidelines to arrive at the optimum supply air temperature. A perceptible change in the temperature and flow distribution is observed for the six cases investigated.
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He, Shuquan, Baoyun Qiu, Shiji Chu, and Xiaoli Feng. "Numerical Simulation of Flow Fields and Head Losses of Trash-Barriering in Pumping Station Based on VOF Model." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36617.

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In order to calculate flow fields behind the trash rack and the head loss caused by trash-barriering, the waterweed lump congregated in front of the trash rack was simplified as watertight entity that has the same shape and the same size of the waterweed lump. We adopted ANSYS CFX software and VOF method in numerical simulation of the flow fields of trash-barriering, calculated several schemes, and analyzed the influences of blockage. The results show that: the water level difference and the head loss of numerical simulation are consistent with results of experiment. Because of tiny water permeability of the waterweed lump in front of the trash rack, there are nuances between the flow fields behind the trash rack of numerical simulation and experiment. The specific gravity of the waterweeds is less than that of water and the waterweeds block the up part of the trash rack, which makes the flow velocity through the down unblocked part of the trash rack increase rapidly. As a result, the velocity behind the trash rack increases in the lower area, and decreases, even the backflow appears in the upper area. With the increase of the blockage ratio, the turbulence scale behind the trash rack increases. When the blockage ratio increases to 0.7, the velocity uniformity already decreases to −1.57. The head loss of trash-barriering increases when the blockage ratio and the velocity in front of the trash rack increase. For certain velocity in front of the trash rack, when the blockage ratio reaches 0.6∼0.7, the head loss would increase rapidly.
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Schmidt, Roger, and Ethan Cruz. "Cluster of High Powered Racks Within a Raised Floor Computer Data Center: Effect of Perforated Tile Flow Distribution on Rack Inlet Air Temperatures." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42240.

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This paper focuses on the effect on inlet rack air temperatures as a result of maldistribution of airflows exiting the perforated tiles located adjacent to the fronts of the racks. The flow distribution exiting the perforated tiles was generated from a computational fluid dynamics (CFD) tool called Tileflow (Trademark of Innovative Research, Inc.). Both raised floor heights and perforated tile free area were varied in order to explore the effect on rack inlet temperatures. The flow distribution exiting the perforated tiles was used as boundary conditions to the above floor CFD model. A CFD model was generated for the room with electronic equipment installed on a raised floor. Fourty racks of data processing (DP) equipment were arranged in rows in a data center cooled by chilled air exhausting from perforated floor tiles. The chilled air was provided by four A/C units placed inside a room 12.1 m wide × 13.4 m long. Since the arrangement of the racks in the data center was symmetric only one-half of the data center was modeled. The numerical modeling for above the raised floor was performed using a commercially available finite control volume computer code called Flotherm (Trademark of Flomerics, Inc.). The flow was modeled using the k-e turbulence model. Results are displayed to provide some guidance on the design and layout of a data center.
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Wang, Yifan, Guangwu Tang, Armin K. Silaen, Albert J. Kirk, and Chenn Q. Zhou. "Investigation of Hot Water Injection Effects on Reducing Frozen Blockage in a Water Intake Unit." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71033.

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The major issues affecting lake water intake structures and pipelines are frazil ice events during the winter time that reduce the intake water flow. These events can completely block the trash rack and unexpectedly shut down the intake facility. The blockages of intake trash racks occur in cold weather and under water, making them difficult to observe and measure. Computational fluid dynamics (CFD) models provide a valuable method of understanding the operating conditions and phenomena that occur inside the water intake with different blockage percentages. Hot flow is simulated to be injected into the water intake to against the frazil ice formation. Simulation results include the flow velocity, mass flow rate and the water temperature distribution. The injected flow includes hot water and steam bubbles. It is concluded that hot water injection can only heat the water flow below the trash rack, but steam bubble injection rises throughout the geometry and produces turbulences along the bubble paths.
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Zhou, Rongliang, Cullen Bash, Zhikui Wang, Alan McReynolds, Thomas Christian, and Tahir Cader. "Data Center Cooling Efficiency Improvement Through Localized and Optimized Cooling Resources Delivery." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88817.

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Data centers are large computing facilities that can house tens of thousands of computer servers, storage and networking devices. They can consume megawatts of power and, as a result, reject megawatts of heat. For more than a decade, researchers have been investigating methods to improve the efficiency by which these facilities are cooled. One of the key challenges to maintain highly efficient cooling is to provide on demand cooling resources to each server rack, which may vary with time and rack location within the larger data center. In common practice today, chilled water or refrigerant cooled computer room air conditioning (CRAC) units are used to reject the waste heat outside the data center, and they also work together with the fans in the IT equipment to circulate air within the data center for heat transport. In a raised floor data center, the cool air exiting the multiple CRAC units enters the underfloor plenum before it is distributed through the vent tiles in the cold aisles to the IT equipment. The vent tiles usually have fixed openings and are not adapted to accommodate the flow demand that can vary from cold aisle to cold aisle or rack to rack. In this configuration, CRAC units have the extra responsibilities of cooling resources distribution as well as provisioning. The CRAC unit, however, does not have the fine control granularity to adjust air delivery to individual racks since it normally affects a larger thermal zone, which consists of a multiplicity of racks arranged into rows. To better match cool air demand on a per cold aisle or rack basis, floor-mounted adaptive vent tiles (AVT) can be used to replace CRAC units for air delivery adjustment. In this arrangement, each adaptive vent tile can be remotely commanded from fully open to fully close for finer local air flow regulation. The optimal configuration for a multitude of AVTs in a data center, however, can be far from intuitive because of the air flow complexity. To unleash the full potential of the AVTs for improved air flow distribution and hence higher cooling efficiency, we propose a two-step approach that involves both steady-state and dynamic optimization to optimize the cooling resource provisioning and distribution within raised-floor air cooled data centers with rigid or partial containment. We first perform a model-based steady-state optimization to optimize whole data center air flow distribution. Within each cold aisle, all AVTs are configured to a uniform opening setting, although AVT opening may vary from cold aisle to cold aisle. We then use decentralized dynamic controllers to optimize the settings of each CRAC unit such that the IT equipment thermal requirement is satisfied with the least cooling power. This two-step optimization approach simplifies the large scale dynamic control problem, and its effectiveness in cooling efficiency improvement is demonstrated through experiments in a research data center.
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Elyyan, Mohammad A., and Gokul V. Shankaran. "Modeling Guidelines for Large Telecom Rack CFD Models." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64115.

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Large electronics systems such as telecom racks and VME bus systems contain arrays of several cards where fan trays consisting of multiple fans are employed to provide forced convective cooling. Typically, flow distributors such as slotted plates are used to distribute the flow evenly through the cards. Thus, a typical telecom rack system contains a large number of parts, with a wide range of length scales. Thus, modeling such large electronic systems with all components can be challenging in terms of solution time and computational resources. In this paper, we presented two techniques to create compact board models that capture the overall physical behavior of detailed boards: 1) the Lumped Block (LB) method, which is a geometry based simplification technique, 2) the Calibrated Porous Medium (CPM) method, which is based on wind tunnel calibrations. Although different in concept, both schemes showed similar behavior when compared to the detailed card, where the maximum difference from pressure drop across the board was less than 10% and less than 30% for the thermal resistance. Moreover, both schemes resulted in mesh reduction that is greater than 83%. Despite the relatively large deviation in the thermal part, both techniques provide good choices for system level analysis where general information about the flow structure and thermal behavior of the system is required.
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Reports on the topic "Mechanical rack"

1

Callaway, Steven P. White House Communications Agency (WHCA) Presidential Voice Communications Rack Mount System Mechanical Drawing Package. Fort Belvoir, VA: Defense Technical Information Center, November 2015. http://dx.doi.org/10.21236/ad1000590.

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DEVELOPMENT AND APPLICATION OF A MECHANICAL MODEL OF BEAM-TO-COLUMN CONNECTIONS OF STEEL STORAGE RACKS. The Hong Kong Institute of Steel Construction, September 2019. http://dx.doi.org/10.18057/ijasc.2019.15.3.10.

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