Academic literature on the topic 'Centrifugal casting method'
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Journal articles on the topic "Centrifugal casting method"
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Mäsiar, H., L. Repka, P. Lipták, and O. Híreš. "Investigate the Possibility of Tekcast Methods Used for Casting Polymeric Resin Materials." Archives of Foundry Engineering 14, no. 2 (2014): 119–22. http://dx.doi.org/10.2478/afe-2014-0049.
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Abstract Contribution gives an overview of knowledge about the method of centrifugal casting with orientate on Tekcast system. Company Tekcast Industries has developed a device for centrifugal casting, extending the area of production of castings or prototyping of metal or plastic. Materials suitable for the centrifugal casting with flexible operating parameters may include non-ferrous metal alloy based on zinc or aluminum or non-metallic materials such as polyester resins, polyurethane resins, epoxy resins, waxes and the like. The casting process is particularly suitable for a wide range of commercial castings and decorative objects.
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Rostamzadeh, Safar, Behzad Niroumand, and Ali Maleki. "A Novel Method for Semi-Solid Casting of Hypereutectic Gray Cast Iron in Expendable Mold." Solid State Phenomena 256 (September 2016): 237–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.256.237.
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In the present research, the possibility of single stage semi-solid casting of a hypereutectic gray cast iron in a sand mold was investigated. For this purpose, a specially designed chilled sprue sand mold rigged to a vertical centrifugal casting machine was used. The molten cast iron was poured in the chilled sprue sand mold at 1275 oC at a rotation speed of 400 rpm. Two control samples were also poured at 1275 oC under gravity and centrifugal casting conditions in the same mold without sprue chilling. Microstructures and mechanical properties of the specimens were then characterized. The results showed that the average length and thickness of the primary solid phase, i.e. the Kish graphite, and those of the eutectic flake graphite were smaller in semi-solid centrifuged castings and their hardness were higher than those of the control samples. The results are discussed in terms of the shearing and chilling effects of the designed sprue during the initial stages of pouring.
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Jayakumar, E., Jibin C. Jacob, T. P. D. Rajan, M. A. Joseph, and B. C. Pai. "Processing and Characterization of Hypoeutectic Functionally Graded Aluminum – SiC Metal Matrix Composites." Materials Science Forum 830-831 (September 2015): 456–59. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.456.
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The present study describes the processing and characterization of hypoeutectic A319 functionally graded Aluminium metal matrix composite (FGMMC) reinforced with 10 weight percentage SiCp particles of 23 μm size. FGMMC’s are processed by liquid stir casting method followed by vertical centrifugal casting. Metallographic analysis of FGMMC casting reveals the influence of the centrifugal force on the gradation of various phases in the matrix and an increasing gradient distribution of SiC reinforcements gradually from inner towards the outer periphery forming different zones. Tensile and the compressive tests show that the variation in properties are structure sensitive and is confirmed by the dry wear tests. The study clearly depicts the gradient nature in the structure and mechanical properties of the FGM castings produced by centrifugal casting method.
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Kusnowo, Roni, and Kus Hanaldi. "Pengaruh Kecepatan Putar Terhadap Hasil Coran pada Metode Pengecoran Sentrifugal dalam Pembuatan Produk Pisau Pakan Ternak dengan Material Ni-Hard1." Manutech : Jurnal Teknologi Manufaktur 11, no. 01 (2019): 1–7. http://dx.doi.org/10.33504/manutech.v11i01.92.
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Animal feed knife is a tool that serves to cut and chop animal feed consisting of grass as the main ingredient with additives such as bran, herbs, centrate, cassava, tofu pulp and others. Therefore, as a cutting tool must have the properties of friction resistance, impact resistance, and have good sharpness, so that the material chosen is Ni-Hard 1. The use of centrifugal casting method was chosen because it has the advantage of being able to make castings with relatively thin thickness this is due to the influence of the centrifugal force on the distribution of metal liquids throughout the cavity in the mold. Case study in this study is the use of centrifugal casting methods as an alternative to gravity casting methods to overcome defects of misruns. This research was conducted to investigate the effect of speed on the formation of castings products. The method that was carried out began with a literature study on centrifugal casting, and continued by determining the material, the temperature of the cast is in the range 1250ºC - 1300ºC, and the type of mold. The next step is to do work drawings, pattern making, mold making, casting processes, fettling processes, and analysis. With variations in speed of 200 rpm, 300 rpm and 400 rpm, it can be seen the optimal speed for making this product. The results of this study obtained optimal speed at a speed of 300 rpm to make good quality of animal feed knife products.
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Zhang, Jun, Jian Xin Zhou, Ming Yuan Zhang, et al. "Numerical Simulation of Filling Process in Vertical Centrifugal Casting Based on Projection-Level Set Method." Advanced Materials Research 314-316 (August 2011): 364–68. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.364.
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A three-dimensional incompressible two phase flow model of vertical centrifugal casting is proposed to simulate the fluid flow of mould filling process accurately and effectively. The Projection method is adopted to solve the govern equation of the flow field, and the Level Set method is used to capture the free surface. The mold filling of a complex part with thin-wall is simulated. The numerical result shows that the Projection-Level Set method could simulate centrifugal casting effectively. The present study has a guiding significance to the production of vertical centrifugal casting.
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Aliyev, Elman. "NATIONAL ECONOMIC SIGNIFICANCE UNDER THE CONDITIONS OF THE ECONOMY OF KNOWLEDGE OF CASTING PRODUCTION AND THE KEY DIRECTIONS OF ITS DEVELOPMENT." ETM - Equipment, Technologies, Materials 05, no. 01 (2021): 16–20. http://dx.doi.org/10.36962/etm0501202016.
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The modern economy is increasingly based on knowledge and, more broadly, on intangible assets that ensure sustainable innovation growth. The formation of an innovative type of knowledge economy can be considered one of the fundamental development trends at the global level. The modernization of the economy in the lifetime period means the introduction of modern technologies, increasing energy efficiency and labor productivity, producing high-quality products according to the most advanced standards. Ultimately, this is the creation of a competitive economy. Keywords: Casting, billet, castings, method of making castings, injection molding, centrifugal casting, investment casting, shell casting, chill casting.
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Velikov, Angel, Ivanov Ivanov, and Ivan Georgiev. "STRUCTURAL INVESTIGATION OF THE INTERMEDIATE LAYER IN A BIMETAL MILL ROLLER PRODUCED BY THE METHOD OF VERTICAL AXIS CENTRIFUGAL CASTING." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2021): 255–58. http://dx.doi.org/10.17770/etr2021vol1.6533.
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Subject of the investigation is a bimetallic mill roller with external, working layer from high chromium material and inner, supporting layer from ductile cast iron. The processes, accompanying the formation of a transition layer in bimetallic castings, produced by centrifugal casting have been investigated. Attention has paid to the structural changes in the transition zone, caused by the diffusion processes occurring during the casting and crystallization.
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Stradomski, G., M. Nadolski, and Z. Stradomski. "Technological Assessment of the Possibility of Making Light-section Castings of GX2CrNiMoN25-6-3 Cast Steel by the Centrifugal Casting Method." Archives of Foundry Engineering 15, no. 3 (2015): 57–60. http://dx.doi.org/10.1515/afe-2015-0060.
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Abstract The paper presents the results of investigation into the technological possibility of making light-section castings of GX2CrNiMoN25-6-3 cast steel. For making castings with a wall thickness in the thinnest place as small as below 1 mm, the centrifugal casting technology was employed. The technology under consideration enables items with high surface quality to be obtained, while providing a reduced consumption of the charge materials and, as a result, a reduction in the costs of unit casting production.
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Li, Qiang, Jing Yuan Yu, and Xiu Juan Meng. "Study on Preparation and Property of Carbon Fiber/HA Composites by Centrifugal Slip Casting Method." Advanced Materials Research 1058 (November 2014): 180–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1058.180.
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In this paper, centrifugal slip casting method was use to prepare carbon fiber/HA composites using the nanoHA particles and carbon fibers as initial materials. The morphology of the carbon fiber after modification of p-aminobenzoic acid was observed. The rheological characteristic of the carbon fibers/HA slurries was studied. The effects of the centrifugal acceleration on green density uniformity of carbon fiber/HA composites were analyzed. The bending strength and fracture toughness of carbon fiber/HA composites were measured. The results show the roughness of carbon fibers treated by p-aminobenzoic acid increases. At the pH of 10 and 5 wt% dispersant, the HA slurries with 3 vol% carbon fibers have good fluidity. After centrifuged at 2860 G for 30 min, the green compacts of HA composites have high and uniform the green density. After sintered at 1100°C for 1h, compared with carbon fiber/HA composites prepared by dry pressing, the modified carbon fiber/HA composites prepared by centrifugal slip casting have higher bending strength and fracture toughness of 89.4 MPa and 1.92MPa1/2, respectively.
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Watanabe, Yoshimi, Yasumasa Oya, and Hisashi Sato. "Novel Centrifugal Casting Method by using Machining Chips." Transactions of the Materials Research Society of Japan 38, no. 1 (2013): 21–26. http://dx.doi.org/10.14723/tmrsj.38.21.
Full textDissertations / Theses on the topic "Centrifugal casting method"
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BURLET, REBUFFEL HELENE. "Fatigue thermomecanique : application aux outillages de coulee par centrifugation." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0077.
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Gurbuz, Selen Nimet. "Synthesis And Characterization Of Bulk Glass-forming Iron-boron Based Alloy Systems." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605103/index.pdf.
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The aim of this study, which was carried out in two main parts, is to investigate the glass forming ability of Fe-based systems. The first part involves the theoretical modeling to cover the requirement of a predictive model to identify the Fe-based alloy families that have high glass forming ability in the frame of atomistic and thermodynamic approach. The second part involves the experimental investigations to prove the results of the conducted theoretical modeling studies. For this purpose, in the first part, theoretical investigations were performed to identify the third alloying elements that will lead to an increase in the glass forming ability on the base of electronic theory of alloys in pseudopotential approximation for selected Fe- based systems, Fe - (B, Zr, Nb, C, W).
In the experimental part, in the frame of the theoretical investigation results, one of the theoretically modeled binary system, and the third alloying elements that were predicted to lead an increase in the glass forming ability of the selected binary system, were determined. As a first step, designated compositions were synthesized by using low grade conventional Fe-B alloy as a raw material by using centrifugal casting technique and copper mold casting method. To compare the results, same compositions were also cast from the high purity elements by using the same technique and method. For the characterization of these cast specimens, DSC, XRD, SEM, EDS and metallographic examination techniques were used. Amorphous structure was successfully obtained in the thin sections of the wedge-cast samples for Fe-B-Nb and Fe-B-W ternary systems.
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Li, Ming-Ru, and 李明儒. "The Study of Zr-Al-Ni-Cu Alloy by Centrifugal Casting Method." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/6y96s4.
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碩士<br>國立臺北科技大學<br>材料科學與工程研究所<br>98<br>In this paper we investigated to study mechanical properties of Zr55Al10Ni5Cu30 alloy include form of bar and sheet prepared by copper mold centrifugal casting process amorphous materials or not. By Simultaneous DSC/DTA-TGA measurements that the bar crystallization temperature(Tx) is 491 ℃, the melting temperature(Tm) is 843 ℃；sheet glass transition temperature(Tg) is 423 ℃, the crystallization temperature(Tx) is the 483 ℃, the melting temperature (Tm) is 839 ℃ . Furthermore, the Diffuse scattering from X-Ray Diffraction (XRD) peaks describe Zr55Al10Ni5Cu30 alloy is amorphous base. The result of XRD data exhibit crystallization in Zr55Al10Ni5Cu30 alloy include Cu10Zr7 , AlZr, CuZr2 , NiZr2 . We comprehended that growth of crystallization depend on Al-rich content of regional progress towards by Energy Dispersive X-Ray Spectrometer(EDS). In aspect of mechanical property, crystallization is advantageous to increase the hardness of alloy untill to occur net-structures in materials.
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Meng, Chieh, and 蒙捷. "The Study on Amorphization of Zr55Al10Ni5Cu30 Alloy Sheet by Centrifugal Casting Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/t5w8zs.
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碩士<br>國立臺北科技大學<br>材料科學與工程研究所<br>99<br>In the modern casting methods, centrifugal casting because of it''s larger centrifugal force could obtain closer finer structure, and be made wider and thinner cross-section than other casting methods. Zr55Al10Ni5Cu30 metallic glasses have good glass forming ability, high thermal stability of the supercooled liquid region and other characteristics. Therefore, we hope to combine these advantages and characteristics, make a larger volume of metallic glass.
This study is prepared the sheet of Zr55Al10Ni5Cu30 alloy by centrifugal casting, discussion this casting method to make larger amorphous materials or not, and research its micro-structure, glass-forming ability, thermal properties and mechanical properties. The sheet of Zr55Al10Ni5Cu30 alloy by X-ray diffraction analysis shows that broad diffraction peaks with a few characteristic Bragg peaks, indicating the structure of specimen are amorphous base with a few precipitation of crystal phase. The result of XRD shows that crystallization in Zr55Al10Ni5Cu30 alloy include Ni7Zr2, Cu10Zr7 and ZrAl. By DSC measurements that first crystallization temperature (Tx) is 482 ℃, supercooled liquid region (ΔTx) is 85.4℃,the most far away from the riser and the thinnest specimen has the best glass forming ability with glass transition temperature (Tg) is 401.4℃, ΔTx is 85.4℃. In the test of mechanical properties, located in the central region of the specimen has the best Vickers hardness value, about 520.8 Hv, because of the precipitation of crystallization is good at enhance the hardness, but after the net-structure appeared, hardness begin to decrease, about 491.5Hv.
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Huang, Lie-Hau, and 黃瑞浩. "Application of Taguchi method on the Optimization Analysis for Titanium Alloy centrifugal casting of thin golf head." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ke7z39.
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碩士<br>國立高雄應用科技大學<br>模具系碩士在職專班<br>106<br>This research is about using Titanium centrifugal casting to cast thin golf head piece and analyzing the yield rate with Taguchi Method to find out the best parameter for casting thin golf head piece.
In this research golf heads are category into three types of heads .The first one is case 1 (one piece).the second one is case 2 (no crown head)and the third one is case 3 (fairway wood).The runner of three types of casting pieces are radiate in round shape. the material of three types of heads is 6-4 Titanium and the casting method is centrifugal casting.analyzing method is Taguchi Method Using centrifugal speed .pouring speed shell temperature and casting material as control factors. and take three samples from three categories to make nine models with Orthogonal Array for analyzing with Taguchi Method and for confirmation of optimization.
The cast results show that lowest average casting yield rates for case 1(one piece).case 2 (no crown head) and case 3 (Fairway wood) are 13.88%.11.3%. and 16.4% and after optimization casting yield rates are increased to 96.24%.95.04%.and 96.74%.The casting yield rate differences are 82.36%. 83.74%.and 80.34%.According to the result the best parameters are shell temperature at 1100℃ centrifugal speed at 500 rpm. pouring speed 0.5 sec and material 8 KGS. By analyzing with Taguchi Method the result shows that increasing pouring speed and temperature of shell effected the casting yield rate. the most Cast with highest temperature helps molten Titanium has the best fluency and decrease opportunity of defect from happening on cast piece For golf thin cast piece. centrifugal casting could decrease the defects of case piece effectively.
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Cardoso, João Oliveira. "Modeling the reverse segregation of reinforcements in functionally graded composites by the longitudinal casting method." Master's thesis, 2016. http://hdl.handle.net/10362/21538.
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In this dissertation, we simulate the production of an Al/SiC functionally graded metal ma-trix composite, made using the process of longitudinal centrifugal casting. This specific method-ology allows the production of geometries that aren’t possible with other variants of the centrifu-gal casting method, making it highly desirable; however, the longitudinal variant has not attracted a wide attention in the literature, namely in regards to the phenomena of reverse, dimensional and transverse segregation.
A MATLAB code was developed to study the effects of reverse segregation; a fixed grid finite difference method was used for this which resulted in the study of the relation between starting casting temperatures and final particle distributions. An additional simulation was made considering a varied particle distribution to briefly study dimensional segregation.
Books on the topic "Centrifugal casting method"
Book chapters on the topic "Centrifugal casting method"
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Harabi, Abdelhamid, and Ferhat Bouzerar. "Fabrication of Tubular Membrane Supports from Low Price Raw Materials, Using Both Centrifugal Casting and/or Extrusion Methods." In Expanding Issues in Desalination. InTech, 2011. http://dx.doi.org/10.5772/23383.
Full textConference papers on the topic "Centrifugal casting method"
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Torii, Shuichi, Satoyuki Tanaka, Toshiaki Yano, and Yoshimi Watanabe. "Theoretical and Experimental Study on Suspended Circular Disk Motion in Centrifugal Casting Device." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59008.
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Functionally Graded Materials are high performance composite materials, in which physical and/or chemical properties of these material structures are graded in the several directions. Centrifugal solid-particle method is one of the effective fabrication methods by use of centrifugal casting devices. The casting mold that includes reinforcement particle and molten metal are centrifuged and particles move in the mixture due to density differences of these materials. However, there is no information on the particle motions. The aim of the present study is to disclose on suspension particle motion in the axially rotating drum. The particle velocity of the circular disk is measured by PTV (Particle Tracking Velocimetry) method and is theoretically predicted by BBO (Basset-Boussinesq-Ossen) equation. It is found that (1) each particle motion is affected by the rotating speed, (2) the measured velocity is compared with theoretical result, and (3) when the particle moves in the Stokes’ regime, its velocity is linearly increased with the distance from the center of the drum and this trend is intensified with an increase in the rotating speed.
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Li, Xiao, Ning Gao, Jintao Deng, et al. "A data-driven method of product quality monitoring for industrial furnace tube centrifugal casting process." In 2013 Fourth International Conference on Intelligent Control and Information Processing (ICICIP). IEEE, 2013. http://dx.doi.org/10.1109/icicip.2013.6568044.
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Mun, Jiwon, Jaehyung Ju, and James Thurman. "Indirect Additive Manufacturing Based Casting (I AM Casting) of a Lattice Structure." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38055.
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Direct-metal additive manufacturing (AM) processes such as Selective Laser Melting (SLM) and Electron Beam Melting (EBM) methods are being used to fabricate complex metallic cellular structures with a laser or electron beam over a metal powder bed. Even though these processes have excellent capabilities to fabricate parts with cellular mesostructures, there exist several constraints in the processes and applications: limited selection of materials, high thermal stress by the high local energy source, poor surface finish, and anisotropic properties of parts caused by combined effects of one-dimensional (1D) energy based patterning mechanism, the deposition layer thickness, powder size, power and travel speed of laser or electron beam. In addition, manufacturing cost is still high with the Direct-metal AM processes. As an alternative for manufacturing metallic 3D cellular structures, which can overcome the disadvantages of direct-metal AM techniques, polymer AM methods may be combined with metal casting. We may call this “Indirect AM based Casting (I AM casting)”. The objective of this study is to explore the potential of I AM Casting associated with development of a novel manufacturing process — Indirect 3D Printing based centrifugal casting which is capable of producing multifunctional metallic cellular structures with internal cooling channels having a 2mm inner diameter and 0.5mm wall thickness. We characterize polymers by making expendable patterns with a polyjet type 3D printer; e.g., modulus, strength, melting and glass transition temperatures and thermal expansion coefficients. A transient flow and heat-transfer analysis of molten metal through 3D cellular network mold will be conducted. Solidification of molten metal through cellular mold during casting will be simulated with temperature dependent properties of molten metal and mold over a range of running temperatures. The volume of fluid (VOF) method will be implemented to simulate the solidification of molten metal together with a user defined function (UDF) of ANSYS/FLUENT. Finally, experimental validation will be conducted.
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Mun, Jiwon, Matthew Busse, Jaehyung Ju, and James Thurman. "Multilevel Metal Flow-Fill Analysis of Centrifugal Casting for Indirect Additive Manufacturing of Lattice Structures." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52270.
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The centrifugal casting is a classical manufacturing method and it has been widely studied. However, when it comes to manufacture thin walled lattice materials with complex three-dimensional meso-structures, a multiscale flow-fill analysis may be needed for macro-filling at the sprue system and micro-filling at lattice structures. On the micro-filing analysis for a thin walled lattice structure, the surface tension of molten metal appears to be an important factor. On the other hand, flow inertia may affect the flow-filling process more than the surface tension of molten metal does. Our hypothesis is that there exist a range of ratios of cell wall thickness to length that are primarily affected by surface tension or density. From comparison with two different molten metals — aluminum and copper alloys, we can estimate the characteristic of flow, which will be of benefit when designing lattice structures and selecting materials for the manufacturing process. The objective of this study is to test the hypothesis by constructing an analytical model on flow filling of molten metals (aluminum alloy and copper alloy) associated with manufacturing lattice structures. The Naiver-Stokes equation with surface tension is considered for modeling of the flow of molten metal along the micro-channel of lattice structures and is numerically implemented with MATLAB. Temperature dependent properties of the liquid metals; e.g., density, viscosity, and conductivity, are considered for building the analytical model. Numerical simulations with a commercial code, ANSYS are conducted using a user defined function. Experimental validation is followed to manufacture a cubic truss lattice structure with a varying wall thickness; 0.5–1mm. Two molten metals — aluminum alloy and copper alloy are used for filling the mold at the centrifugal casting system. The mold is prepared by removing sacrificial lattice patterns made by a polyjet 3D printer. The preliminary result shows that the final lattice structures with an aluminum alloy through the 3D printing of sacrificial pattern followed by centrifugal casting have relatively good flow filling property at thin wall thickness (∼0.5mm) due to low surface tension of aluminum alloy. On the other hand, the high surface tension of a copper alloy prevents flow-fill to micro-channel mold cavity, resulting in early solidification. The indirect additive manufacturing based casting shows an excellent surface quality, which can be used for manufacturing cellular structures. A coupled flow and heat transfer of molten metal successfully simulate flow-fill and solidification and is compared with the experiment. Faster filling-time and faster solidification for the temperature-dependent material properties were shown.
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Mudrov, Andrej, Antanas Šapalas, and Gintas Šaučiuvėnas. "Experimental study of CFST column to steel beam bolted connection with curved end-plates." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.055.
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This paper presents results of experimental study of a bolted column-beam connection with an extended curved end-plate joining steel beam and a hollow core Concrete-Filled Steel Tube (CFST). Column concrete hollow core was formed by centrifugal casting process that allowed decreasing porosity, increasing homogeneity and strength of the concrete. It was expected that strength and stiffness of the joint would be significantly affected by spalling of the concrete core due to transverse action, which would limit rotation of the joint and bearing capacity of the column. However, the concrete hollow core had no prominent signs of fracture – bending strength of the joint was determined by punching shear of the steel tube wall. Further result analysis has shown that, in reference to Eurocode 3, the joint may be classified as semi-rigid and that non-uniform initial contact between the end-plates and the column can reduce stiffness of the joint. In addition to this, it has been found that the analytical Eurocode component method is in close agreement with the attained test results, but its feasibility should be validated against additional tests with other failure modes.
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Mer, K. K. S., S. Ray, R. B. Patel, and B. P. Singh. "Low speed centrifugal casting of Functionally Graded solid cast ingot by anomalous particle distribution." In 2ND INTERNATIONAL CONFERENCE ON METHODS AND MODELS IN SCIENCE AND TECHNOLOGY (ICM2ST-11). AIP, 2011. http://dx.doi.org/10.1063/1.3669969.
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Kaneko, Yasutomo, Kazushi Mori, and Hiroharu Ooyama. "Resonant Response and Random Response Analysis of Mistuned Bladed Disk Consisting of Directionally Solidified Blade." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42875.
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Recently, DS (Directionally Solidified) and SC (Single Crystal) alloys have been widely applied for gas turbine blades instead of CC (Conventional Casting) alloys, in order to improve the creep rupture strength. The DS blade consists of several columnar grains of SC, where the growing direction of the columnar crystal is set to the direction of the centrifugal force. Because the elastic constants of the DS blade are anisotropic, the mistuning characteristics of the bladed disk consisting of the DS blades seem to be different from those of the CC blade. In this study, the resonant response and random response analysis of mistuned bladed disks consisting of the DS blades are carried out, considering the deviations of the elastic constants and the crystal angle of the DS blade. The FMM (Fundamental Mistuning Model) and the conventional modal analysis method are used to analyze the vibration response of the mistuned bladed disk. The maximum resonant response and random response of the mistuned bladed disk consisting of the DS blades are estimated by the Monte Carlo simulation combining with the response surface method. These calculated results for the DS blades are compared with those of the CC blades. From these results, it is concluded that the maximum response of the mistuned bladed disk consisting of the DS blades is the nearly same as that of the CC blades. However, in the design of the tuned blade, where the blade resonance should be avoided, it is necessary to consider that the range of the resonant frequency of the DS blade becomes wider than that of the CC blade.
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Doria, Alberto, and Matteo Formentini. "Identification of the Structural Modes of High Performance Bicycles in the Perspective of Wobble Control." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47030.
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Most of researches in the field of bicycle dynamics deal with auto-stabilization and rider control by means of steer-torque and lean-torque. Bicycle models composed by rigid bodies with thin wheels making point contact with the road and rolling without any slip are suited for carrying out these studies. Numerical analysis of stability by means of these models leads to the capsize, castering and weave modes, which make it possible to understand many aspects of bicycle dynamics. However, some high performance bicycles at high speed show dangerous wobble oscillations. Cyclists’ experience and recent researches highlight that wobble phenomena are related both to tire properties and to fork and frame compliance. Since structural compliance in dynamic conditions generates vibrations, this paper focuses on the study of structural vibrations of high performance bicycles with the modal analysis approach. To isolate the effects of frame and fork compliance, four particular bicycles are considered, they are built assembling a pair of wheels, two forks (fork A and B) with the same shape but different structures and materials and two frames (frame A and B) with the same shape but different structures. Preliminary road tests showed that bicycles made with components A are more prone to wobble oscillations. In order to have a better comprehension of the different influence of fork and frame compliance, first the two forks (with the front wheel) are modally tested with the steer tube locked to a very stiff structure, then, the whole bicycles are tested. Modal analysis is carried out with the impulse method, for the analysis of each bicycle 60 FRFs are measured. The results of modal analysis are presented and the influence of identified modes on bicycle stability is discussed. An important issue of modal analysis of vehicles is the correlation between modal tests carried out in the laboratory and bicycle behavior on the road. When the vehicle is tested in the laboratory, additional constraints are added to guarantee equilibrium, but centrifugal forces are not present, because the vehicle is stationary. Since the analysis of the equations of linearized dynamics shows that the stiffness matrix includes a part due to centrifugal effects, the additional stiffness terms due to constraints in laboratory tests can be assumed to be equivalent to the centrifugal terms of the stiffness matrix at a certain speed. Details and limits of this equivalence are presented and discussed in the paper.
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Cave, Michael, and Min Ji. "Impeller Manufacturing: Design for Machining." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64724.
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Today, there are 3 primary methods Solar Turbines, Inc. uses for manufacturing shrouded centrifugal impellers for the Oil and Gas industry. Impellers can be made by an investment casting process, single piece integrally-machined using point milling, or fabricated using a flank milled, open faced impeller and brazing a shroud in place. Investment cast impellers give the aero designer the greatest flexibility in the design, since the designer doesn’t need to be concerned about tool access or other manufacturing constraints. It is common to use this process for any impeller. Single piece integrally-machined impellers are relatively straightforward for high flow coefficient impellers, as the wide flow-path provides plenty of room for tool access. For lower flow coefficients, brazed shrouded impellers can be made very precisely, but at a substantially higher cost than the other methods. Each of these manufacturing methods also has a cost and aerodynamic performance associated with them. With the advent of high-speed machining and better cutting tools, integrally-machined impellers can offer an alternative manufacturing process over cast or fabricated impellers. However, determining the ability to integrally-machine an impeller historically is done late or even after the detailed design process. This can lead to costly redesigns to make sure the impeller can be machined, with flow-path and blade adjustments done after the aerodynamic design. Sometimes these adjustments are unsuccessful and the manufacturing process is abandoned. In this paper, 2 medium flow coefficient impellers are redesigned. These impellers are used in pipeline applications for the transmission of natural gas. The original designs were cast. By incorporating highly customized commercial software written exclusively for defining tool paths of integrally-machined shrouded impellers into the aerodynamic design process, new impeller geometry was defined that was able to be integrally-machined, while meeting or exceeding existing impeller performance and improved design cycle time. This paper will discuss how the machining software was used concurrently with CFD and FEA analysis during the design process. Test results from rig tests will be presented, showing measured results from both the original and redesigned stages.
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von der Bank, Ralf, Stefan Donnerhack, Anthony Rae, Michel Cazalens, Anders Lundbladh, and Martin Dietz. "LEMCOTEC: Improving the Core-Engine Thermal Efficiency." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25040.
Full textAbstract:
This paper describes the research carried out in the European Commission co-funded project LEMCOTEC (Low Emission Core Engine Technology), which is aiming at a significant increase of the engine overall pressure ratio. The technical work is split in four technical sub-projects on ultra-high pressure ratio compressors, lean combustion and fuel injection, structures and thermal management and engine performance assessment. The technology will be developed at subsystem and component level and validated in test rigs up to TRL5. The developed technologies will be assessed using three generic study engines (i.e. regional turbofan, mid-size open rotor, and large turbofan) representing about 90% of the expected future commercial aero-engine market. Two additional study engines from the previous NEWAC project will be used for comparison. These are based on intercooled and intercooled-recuperated future engine concepts. The compressor work is targeting efficiency, stability margin and flow capacity by improved aerodynamic design. High-pressure and intermediate-pressure compressors are addressed. The mechanical and thermo-mechanical functions, including the variable-stator-systems, will be improved. Axial-centrifugal compressors with impeller and centrifugal diffuser are under investigation too. Three lean burn fuel injection systems are developed to match the technology to the corresponding engine pressure levels. These are the PERM (Partially Evaporating Rapid Mixing), the MSFI (Multiple Staged Fuel Injection) and the advanced LDI (Lean Direct Injection) combustion systems. The air flow and combustion systems are investigated. The fuel control systems are adapted to the requirements of the ultra-high pressure engines with lean fuel injection. Combustor-turbine interaction will be investigated. A fuel system analysis will be performed using CFD methods. Improved structural design and thermal management is required to reduce the losses and to reduce component weight. The application of new materials and manufacturing processes, including welding and casting aspects, will be investigated. The aim is to reduce the cooling air requirements and improve turbine aerodynamics to support the high-pressure engine cycles. The final objective is to have innovative ultra-high pressure-ratio core-engine technologies successfully validated at subsystem and component level. Increasing the thermal efficiency of the engine cycles relative to year 2000 in-service engines with OPR of up to 70 (at max. condition) is an enabler and key lever of the core-engine technologies to achieve and even exceed the ACARE 2020 targets on CO2, NOx and other pollutant emissions: • 20 to 30 % CO2 reduction at the engine level, exceeding both, the ACARE 15 to 20% CO2 reduction target for the engine and subsequently the overall 50% committed CO2 and the fuel burn reduction target on system level (including the contributions from operations and airframe improvements), • 65 to 70 % NOx reduction at the engine level (CAEP/2) to attain and exceed the ACARE objective of 80% overall NOx reduction (including the contributions from both, operational efficiency and airframe improvement), reduction of other emissions (CO, UHC and smoke/particulates) and • Reduction of the propulsion system weight (engine including nacelle without pylon).