Artykuły w czasopismach: „COMPOSITE ROTOR”

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Varatharajoo, Renuganth, Faizal Mustapha, Dayang Laila Abang Abdul Majid, Rizal Zahari i Ralph Kahle. "Critical Speeds for Carbon/Epoxy Composite Rotors in Spacecraft Energy Storage Applications". Key Engineering Materials 471-472 (luty 2011): 37–42. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.37.

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A numerical investigation to optimize the carbon/epoxy multi layer composite rotor is performed for the spacecraft energy storage application. A high-speed double and triple layer rotor design is proposed and different composite materials are tested to achieve the most suitable recipe. First, analytical rotor evaluation was performed in order to establish a reliable numerical composite rotor model. Subsequently, finite element analysis is employed in order to optimize the double and triple layer composite rotors. Then, the modal analysis was carried out to determine the rotor natural frequencies. The rotor stress distributions and the rotor mode shapes show that a safe operational regime below 46, 000 rotations per minute is achievable.

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Wang, Chuan Sheng, De Wei Zhang i Hui Guang Bian. "Effects of Different Structure Rotors on Mixing Process and Quality of Short Fiber-Rubber Composite Material". Advanced Materials Research 87-88 (grudzień 2009): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.277.

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The structure of rotors is an important factor, which impacts the quality of the mixed rubber. For the short fiber-rubber composite material, the structure of the rotors is most important. Through the experiments study, the mixing performances of four-wing synchronous rotor, six-wing synchronous rotor and new type of six-wing synchronous varying clearance rotor have been studied. The experimental results indicated that the mixing performance of the new type rotor is much better than the four-wing and six-wing synchronous rotor for the mixing of short fiber-rubber composite materials.

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Guo, Song Yi, Chong Li i Wen Yi Li. "Finite Element Analysis of Materials and Processing of Composite Flywheel Rotor". Applied Mechanics and Materials 529 (czerwiec 2014): 92–96. http://dx.doi.org/10.4028/www.scientific.net/amm.529.92.

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Flywheel rotor is the very important component in the flywheel energy storage system (FESS). The key factors of rotor, such as rotor materials, geometry and fabrication process, have directly influence on the performance of FESS. At present, press-assembling the rotor with shrink-fit is used usually to increase strength of composite flywheel rotors filament wound in the radial direction. This paper is concerned that the Von Mises equivalent stress distribution of the metal hub and the radial stress distribution of the composite rim at the speed of 20000rpm by the 3D finite element method. The materials and corresponding minimum value of interference fit of the flywheel rotor are determined based on the analysis results.

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Draghici, Sorin. "Structural evaluation of a composite centrifugal rotor". Scientific Bulletin of Naval Academy XXIII, nr 1 (15.07.2020): 29–33. http://dx.doi.org/10.21279/1454-864x-20-i1-004.

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The steady increase in the use of composites has brought benefits in many areas. Polymer Matrix Composite (PMC) is a material consisting polymer (resin) matrix combined with a fibrous reinforcing dispersed phase. Polymer Matrix Composites are very popular due to their low cost and simple fabrication methods. This paper aims to validate thru finite element method the structural integrity of a composite gas turbine rotor and establish its benefits and disadvantages compared to a steel alternative. Composites provide the advantages of lower weight, greater strength and higher stiffness and the advantage of prepreg technology.

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Lo, Jason. "Designing a Composite Material for Use in Brake Applications". Materials Science Forum 475-479 (styczeń 2005): 1109–12. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1109.

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Traditionally, automotive brake rotors are made with cast iron. Besides having economical advantage, cast iron rotor provides many disadvantages due to its weight, such as reduction in fuel efficiency, increase in green house gas emission, and increase in noise, vibration and hardness. With the development of commercial aluminum composites, composite brake rotors are now manufactured. However, the present commercial composite materials are not specifically made for brake application and there are drawbacks. A major drawback is their poor elevated temperature property. In this paper, the unique properties offered by an aluminum composite for brake application is addressed, and an approach to compensate its properties for brake application is highlighted.

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Mwanyika, Hegespo H., Yusufu AC Jande i Thomas Kivevele. "Design and Performance Analysis of Composite Airfoil Wind Turbine Blade". Tanzania Journal of Science 47, nr 5 (1.12.2021): 1701–15. http://dx.doi.org/10.4314/tjs.v47i5.18.

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Abstract Small horizontal axis wind turbine rotors with composite airfoil rotor blades were designed and investigated in the present study in order to improve its performance in low wind speed and low Reynolds number (Re) conditions for standalone system. The geometrical and aerodynamic nature of a single airfoil small horizontal axis wind turbine blade curtails efficient energy harnessing of the rotor blade. The use of composite airfoil rotor blade improves energy production but imposes uncertainty in determining an optimal design angle of attack and the off design aerodynamic behaviour of the rotor. This research investigated the effects of two airfoils used at different sections in a composite blade and determined the blade’s optimal design angle of attack for maximum power generation. The wind turbine rotor blades were designed using blade element momentum (BEM) method and modelled by SolidWorks software. The SG6042 and SG6043 airfoils were used for the composite airfoil blades. Five wind turbines were designed with rotor blades of design angles of attack from 3° to 7°. The five wind turbine blades were simulated in computational fluid dynamics to determine the optimal design angle of attack. The composite airfoil wind turbine blade showed improved performance, whereas, the wind power generated ranged from 4966 W to 5258 W and rotor power coefficients ranged from 0.443 to 0.457. The blade with design angle of attack of 6° showed highest performance. Keywords: composite airfoil, lift-to-drag ratio, pressure coefficient, Reynolds number, design angle of attack.

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Li, Xing, Christian Mittelstedt i Andreas Binder. "A review of critical issues in the design of lightweight flywheel rotors with composite materials". e & i Elektrotechnik und Informationstechnik 139, nr 2 (29.03.2022): 204–21. http://dx.doi.org/10.1007/s00502-022-01005-4.

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AbstractComposite materials are widely used to build high-performance flywheels due to their high material strength and low mass density. The high degrees of freedom in material selection, design, and manufacturing techniques lead to a variety of rotor structures. This paper presents the characteristics of different composite rotors and the critical considerations in terms of designing, manufacturing, and testing them. The introduction starts with the limitations of a single filament-wound composite rim. Then, various rotor structures are presented as well as the critical issues regarding the composite rim design, rim-shaft connection, and rotor failure in order to make safe design recommendations. The aim is to summarize the current techniques and provide references for further developments.

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Firouz, Fatma, Atef Daoud i Malak Abou El-Khair. "AlSi-SiC Composites for Automotive Brake Rotor". Key Engineering Materials 835 (marzec 2020): 178–85. http://dx.doi.org/10.4028/www.scientific.net/kem.835.178.

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This manuscript investigates the Fabrication and Microstructure of Automotive Brake Rotor Made of AlSi-SiC Composites. This work is oriented toward fabrication of automotive brake rotors from Al-9Si and Al-12Si reinforced with 10 and 20% SiC particles using stir-casting method. The brake rotors were subjected to heat treatment. Aging behavior showed that hardness increased with the addition of SiC reinforcements by 104%, comparing to solution treatment condition. Also, the addition of SiC particles accelerates formation of precipitates. Microstructure of brake rotors made of composite revealed uniform distribution of SiC particles, primary phase (⍺-Al) and modified eutectic Si. EDX analysis showed the presence of Al, Mg and O at the interface between matrix and SiC particles.

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Yang, J., S. Z. HE i L. Q. Wang. "Dynamic Balancing of a Centrifuge: Application to a Dual-Rotor System with Very Little Speed Difference". Journal of Vibration and Control 10, nr 7 (lipiec 2004): 1029–40. http://dx.doi.org/10.1177/1077546304035603.

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The conventional way of separating the vibration signals of the inner and outer rotors of a dual-rotor system is to separate the composite "beat" signal; however, this is not effective for a dual-rotor system with little speed difference. We propose a new method of separating the vibration signals of the inner and outer rotors of a system with veiy little speed difference. It is not necessary to separate the composite " beat" signal, as in the conventional method. The magnitude and phase values of the unbalanced weights are obtrined directly by sampling the vibration signal synchronized with a reference signal. The balancing process is completed by the reciprocity influence coefficients of the method of the inner and outer rotors. The results show the advantage of such a method for a dual-rotor system, compared with conventional balancing. The proposed new method has been successfully implemented in field dynamic balancing of the centrifuge with such dual-rotor systems in two rectifying planes with digital signal processing and virtual instrument technology.

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Medovar, L., G. Polishko, G. Stovpchenko, V. Kostin, A. Tunik i A. Sybir. "Electroslag refining with liquid metal for composite rotor manufacturing". Archives of Materials Science and Engineering 2, nr 91 (1.06.2018): 49–55. http://dx.doi.org/10.5604/01.3001.0012.5489.

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Purpose: To develop novel ESR based process for composite ingot with shallow transition zone between layers in order to produce efficient heavy-weight rotors for steam turbines. Design/methodology/approach: The nowadays heavy-weight rotors for steam turbines for power plants are monoblock or two or more layer in length composite part facilitating operation in different zones withstanding various loads and working medium. However, the joining of various steel in composite rotors by welding has low productivity. The ESR now is recognised as the best available technology for the big-diameter and mass forgings for power generating machines, including rotor ones. The ESR affords the most favourable conditions of solidification resulting in homogenous low-segregation ingot with smooth surface and high-quality structure. The step ahead is the ESR for composite. Findings: The two-layer model ingot had produced from steel grades 12Cr13 and 35NiCrMoV12-5 were manufactured using the electroslag process with the liquid metal (ESR LM) in the CSM of 180 mm in diameter with ingot withdrawing. The transition zone in two-layer ingot had have the shallow shape and low depth with the even macrostructure without defects of the same type as both joined steels. The metal of the transition zone fully satisfies standard requirements for properties of both steel grades in the heat treated and as-cast conditions. Research limitations/implications: The ESR LM can provide both the monobloc heavy ingots with uniform structure and composites with low-stress connection between metal layers for heavyweight rotors and other critical products manufacturing.

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Fomin, V. M., V. N. Kaminsky, R. V. Kaminsky i A. N. Netrusov. "Study of load level of bearing-outlet units of turbocharger with impellers from composite materials". Traktory i sel hozmashiny 88, nr 5 (15.10.2021): 46–54. http://dx.doi.org/10.31992/0321-4443-2021-5-46-54.

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The procedure for the calculation of loading reduction of the bearing assembly of the automotive diesel engines turbocharger forced aspiration by using composite materials for the rotor impellers is decribed. The most significant parameters for such an assessment are the reaction force in the bearing oil layer, the frictional moment in the oil layer, and the relative internal and external clearances in the bearings. The software Flexible Rotor was used as the main computational tool of this study. This software is registered in the register of applied programs for computers No. 2006611094. The study considered the following design options for rotors with a combination of wheels made of different materials: 1) impellers made of traditional metal materials compressor wheel made of aluminum alloy, turbine wheel made of heat-resistant nickel alloy (basic version); 2) сompressor wheel made of composite, turbine wheel made of heat-resistant nickel alloy; 3) aluminum alloy compressor wheel and composite turbine wheel; 4) a compressor wheel and a turbine wheel made of composites. According to the evaluation studies, the most rational options for variable wheel combinations in the rotor design are proposed. In general, the results of the calculations showed that a decrease in the mass-inertial characteristics of the rotor due to the use of composite materials with a low density leads to a decrease in bearing loads and a reduction in friction losses by up to 3 times. The established reduction of the friction torques reduces the intensity of the dissipation of mechanical energy in the bearings. This has a positive effect on the energy efficiency of the turbocharger and reduces the temperature of oil heating from friction.

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Ren, Zheng Yi, Jing Na Liu, Qing Fen Li i Ke Fei Li. "Finite Element Analysis of Composite Flywheel with Two-Layer Pre-Stressed Rotor Structure". Key Engineering Materials 488-489 (wrzesień 2011): 134–37. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.134.

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In this paper, considering the material properties of the composite flywheel and the characteristics of the pre-stressed structure, stresses and strains induced by rotor rotation and interference fit were calculated by finite element (FE) method based on the plane stress hypothesis, in the commercial software ANSYS. Based on the given material properties and the main dimension with a certain speed of rotation, three 2D FE-models of hybrid composite flywheel rotors with two-layer rotor structure were built with the unit property of plane stress, axisymmetric and plane strain respectively. Followed, the radial stress, circumferential stress and radial displacement of the rotor were obtained. The three simulation results are almost accordant with the present theoretical results. It shows that the numerical analyses are reliable. It can be shown that is advisable to design and optimize the flywheel rotor.

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Alnaqi, Abdulwahab A., Shahriar Kosarieh, David C. Barton, Peter C. Brooks i Suman Shrestha. "Material characterisation of lightweight disc brake rotors". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 232, nr 7 (14.03.2016): 555–65. http://dx.doi.org/10.1177/1464420716638683.

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Alumina coated lightweight brake rotors were investigated to evaluate the effect of coating properties on their friction performance and thermal durability. An alumina ceramic coating on AA6082 aluminium alloy (Al-Alloy) and on 6061/40SiC aluminium metal matrix composite (Al-MMC) prepared by plasma electrolytic oxidation was studied using a programme of brake dynamometer and material characterisation tests. The results showed that the plasma electrolytic oxidation alumina layer adhered well to the Al-alloy substrate and was more uniform and durable when compared to that on the aluminium metal matrix composite. The plasma electrolytic oxidation layer significantly improved the hardness of the rotor surface for both Al-alloy and aluminium metal matrix composite substrate. The coated Al-alloy disc brake rotor was demonstrated to give good thermal and friction performance up to high rubbing surface temperatures of the order of 550 ℃, but the rotor eventually failed due to temperature build-up at a critical location.

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Bai, Yue, Qingjia Gao, Haiwen Li, Yihui Wu i Ming Xuan. "Design of composite flywheel rotor". Frontiers of Mechanical Engineering in China 3, nr 3 (21.05.2008): 288–92. http://dx.doi.org/10.1007/s11465-008-0045-y.

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Headifen, G. R., i E. P. Fahrenthold. "Mechanical and Electrical Properties of Glass and Carbon Fiber-Reinforced Composites". Journal of Energy Resources Technology 113, nr 3 (1.09.1991): 176–81. http://dx.doi.org/10.1115/1.2905801.

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The design of composite rotors for high-energy density pulsed power supplies demands accurate characterization of both the mechanical and electrical properties of fiber-reinforced epoxy. The mechanical properties of S-2 glass-epoxy, IM6 graphite-epoxy, and hybrid graphite-glass epoxy composites were measured in tension and torsion tests, providing strength and stiffness parameters for rotor dynamics modeling. Variable frequency electrical resistivity tests were conducted to allow estimation of eddy current losses arising in carbon-reinforced materials. Volume fraction measurements using electron microscopy and analysis by digestion allow for normalization of the test results with respect to composite fiber content. The experimental results were used to evaluate the micromechanical rule of mixtures and Halpin-Tsai correlations.

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Singh, Mandeep, Harish Kumar Garg, Sthitapragyan Maharana, Appusamy Muniappan, M. K. Loganathan, Tien V. T. Nguyen i V. Vijayan. "Design and Analysis of an Automobile Disc Brake Rotor by Using Hybrid Aluminium Metal Matrix Composite for High Reliability". Journal of Composites Science 7, nr 6 (12.06.2023): 244. http://dx.doi.org/10.3390/jcs7060244.

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Due to their superior capabilities for manufacturing lightweight automotive components, aluminium metal matrix composites have gained a lot of attention in the last few years. Aluminium metal matrix composites are an exceptional class of metal matrix composites that can solve all the major problems related to the automobile industry. Aluminium matrix composites in the disc braking system have already been employed and studied by many scientists. However, the developed materials are not yet always sufficiently accurate and reliable. In this article, a new enhanced metal matrix composite material is used and studied to improve the efficiency of an ordinary car’s braking system. To improve the accuracy of the designated braking system, an innovative hybrid aluminium matrix composite (Al6061/SiC/Gr)-based brake rotor has been developed, and its effectiveness has been determined by finite element analysis. From the simulation, the product performance confirmed that the hybrid aluminium matrix composite (Al6061/SiC/Gr)-based brake rotor has the potential to replace the standard cast iron brake disc. The new enhanced hybrid composite material used in this study can be used for the efficient design of various braking parts.

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Sałaciński, Michał, Rafał Kowalski, Michał Szmidt i Sławomir Augustyn. "A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process". Fatigue of Aircraft Structures 2019, nr 11 (1.12.2019): 56–67. http://dx.doi.org/10.2478/fas-2019-0006.

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AbstractThe fatigue test was carried out on an element of a rotor blade removed from the Mi-2 helicopter. The purpose of the test was to check the fatigue strength of the repaired rotor blade. Metal composite rotor blades have a metal spar in the form of a box and the trailing sections in the form of metallic honeycomb sandwich panels. The trailing sections are bonded to the spar. The repair had been carried out at the point where the trailing section became debonded from the spar at the Air Force Institute of Technology in Warsaw using a methodology developed for carrying out repairs of rotor blades’ damage. All types of the Mi family helicopters are equipped with metal composite rotors blades. Depending on MTOW (Maximum Take-Off Weight) and destination of helicopters, blades differ in dimensions, but their design solutions are practically the same. For this reason, the developed repair methodology can be used for all characteristic rotor blades structures for Mi helicopters. The fatigue test was performed at the Łukasiewicz - Institute of Aviation in Warsaw, using a hydraulically driven fatigue machine. The fatigue test was carried out by performing over 1.1 million load cycles. In repair places, upon completion of fatigue testing, no damage was found.

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Sivaprakasam, Palani, Esayas Abebe, Robert Čep i Muniyandy Elangovan. "Thermo-Mechanical Behavior of Aluminum Matrix Nano-Composite Automobile Disc Brake Rotor Using Finite Element Method". Materials 15, nr 17 (1.09.2022): 6072. http://dx.doi.org/10.3390/ma15176072.

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Analysis of mechanical and thermal behaviors during braking has become an increasingly important issue in many transport sectors for different modes of transportation. Brake failure generated during braking is a complex phenomenon confronting automobile manufacturers and designers. During braking, kinetic energy is transferred to thermal energy, resulting in the intense heating of disc brake rotors that increases proportionally with vehicle speed, mass, and braking frequency. It is essential to look into and improve strategies to make versatile, thermally resistant, lightweight, high-performance discs. As a result, this study uses the finite element method to conduct a thermo-mechanical analysis of aluminum alloy and aluminum matrix nano-composite disc brake rotors to address the abovementioned issues. The FEA method is used for the thermo-mechanical analysis of AMNCs for vented disc brake rotor during emergency braking at 70 km/h. From the results obtained, aluminum base metal matrix nano-composites have an excellent strength-to-weight ratio when used as disc brake rotor materials, significantly improving the discs’ thermal and mechanical performance. From the result of transient thermal analysis, the maximum value of heat flux obtained for aluminum alloy disc is about 8 W/mm2, whereas for AMNCs, the value is increased to 16.28 W/mm2. The result from static analysis shows that the maximum deformation observed is 0.19 mm for aluminum alloy disc and 0.05 mm for AMNCs disc. In addition, the maximum von Mises stress value of AMNC disc is about 184 MPa. The maximum von Mises stress value of aluminum alloy disc is about 180 MPa. Therefore, according to the results, the proposed aluminum base metal matrix nano-composites are valid for replacing existing materials for disc brake rotor applications.

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Mittelstedt, Marvin, Christian Hansen i Pierre Mertiny. "Design and Multi-Objective Optimization of Fiber-Reinforced Polymer Composite Flywheel Rotors". Applied Sciences 8, nr 8 (30.07.2018): 1256. http://dx.doi.org/10.3390/app8081256.

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A multi-objective optimization strategy to find optimal designs of composite multi-rim flywheel rotors is presented. Flywheel energy storage systems have been expanding into applications such as rail and automotive transportation, where the construction volume is limited. Common flywheel rotor optimization approaches for these applications are single-objective, aiming to increase the stored energy or stored energy density. The proposed multi-objective optimization offers more information for decision-makers optimizing three objectives separately: stored energy, cost and productivity. A novel approach to model the manufacturing of multi-rim composite rotors facilitates the consideration of manufacturing cost and time within the optimization. An analytical stress calculation for multi-rim rotors is used, which also takes interference fits and residual stresses into account. Constrained by a failure prediction based on the Maximum Strength, Maximum Strain and Tsai-Wu criterion, the discrete and nonlinear optimization was solved. A hybrid optimization strategy is presented that combines a genetic algorithm with a local improvement executed by a sequential quadratic program. The problem was solved for two rotor geometries used for light rail transit applications showing similar design results as in industry.

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Venkatachalam, G., i A. Kumaravel. "Mechanical Behaviour of Aluminium Alloy Reinforced with Sic/Fly Ash/Basalt Composite for Brake Rotor". Polymers and Polymer Composites 25, nr 3 (marzec 2017): 203–8. http://dx.doi.org/10.1177/096739111702500304.

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Gray cast iron is the most commonly used material in automobile brake rotors. It generates heat easily during braking which affects its mechanical properties and the Coefficient of friction varies depending on the type of material used for the brake rotor. Aluminium (Al) based metal matrix composite can be an efficient and effective braking material compared to cast iron and matrix alloy. In the present investigation, Al6082 composites were fabricated by stir casting method by varying weight percentage of reinforcements for Sample1 (Al 90% + SiC 10%), Sample 2 (Al 90% + SiC 5% + fly ash 5%) and Sample 3 (Al 90% + SiC 5% + basalt 5%). Chemical compositions, micro hardness, wear test and tensile test were performed to study the mechanical behavior of all the test specimens. The surface morphology was studied using microscopic inspection to indicate the distribution of reinforcement particles and bonding between the matrixes. Composites containing hard oxides (like SiC) are preferred for high wear resistance along with increased hardness and high temperature oxidation resistance. The result reveals that wear rates of the composite materials is lower than that of the matrix alloy and friction coefficient was minimum. Also, it improves the micro hardness and tensile strength. The addition of fly ash and basalt decreases the wear and it acquired density almost three times lower than that of gray cast iron. In this investigation, the alternate materials for automobile brake rotors with Al reinforced composites were studied.

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Chan, Wen S., Charles Rogers, James D. Cronkhite i James Martin. "Delamination Control of Composite Rotor Hubs". Journal of the American Helicopter Society 31, nr 3 (1.07.1986): 60–69. http://dx.doi.org/10.4050/jahs.31.60.

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Hodges, Dewey H. "Review of composite rotor blade modeling". AIAA Journal 28, nr 3 (marzec 1990): 561–65. http://dx.doi.org/10.2514/3.10430.

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Rioux-Damidau, F., C. Rioux i A. Gueraud. "Machines asynchrones à rotor massif composite". Revue de Physique Appliquée 24, nr 11 (1989): 1039–47. http://dx.doi.org/10.1051/rphysap:0198900240110103900.

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Garfinkle, M. "Smarter rotor-blade composite ‘smart’ spar". Materials & Design 15, nr 1 (styczeń 1994): 27–31. http://dx.doi.org/10.1016/0261-3069(94)90057-4.

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Tang, Shuang Qing, i Xing Xia. "Stress Analysis of Isotropic Material Flywheel Battery Rotor". Applied Mechanics and Materials 532 (luty 2014): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amm.532.519.

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The strength of metal materials is far less than the new composite material, such as carbon fiber. However, the price of the metal material and manufacturing cost are much lower than composite materials, which makes isotropic material much more practical for flywheel rotor. Through the stress analysis of isotropic material rotor, we can optimize the parameters of the rotor, thus for isotropic material provides the basis for the design of the rotor for flywheel battery.

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Zhang, De Wei, Chuan Sheng Wang i Guang Yi Lin. "Effects of Rotor Speed on Manufacturing Process of Short Fiber-Rubber Composite Material". Advanced Materials Research 221 (marzec 2011): 350–55. http://dx.doi.org/10.4028/www.scientific.net/amr.221.350.

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Rotor Speed is an important factor which impacts the mixing process and quality of mixed rubber greatly. The effects of different rotor speeds on manufacturing process of short fiber-rubber composite material have been studied by experimental study. In the experiments, the rotor speeds were 50rpm, 60rpm, 70rpm and 80rpm respectively. The experimental results indicated that the mixed rubber after vulcanized had better physical and mechanical properties as the rotor speed was 70rpm. So the rotor speed that is 70rpm has been chosen for manufacturing short fiber-rubber composite material.

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Rajesh, M., C. R. Mahesha, Shivarudraiah i K. V. Sharm. "Development of Al7075 Reinforced with Multiwalled Carbon Nanotubes for Strength Evaluation and FE Static Analysis of Idealized Brake Rotors". Materials Science Forum 969 (sierpień 2019): 373–79. http://dx.doi.org/10.4028/www.scientific.net/msf.969.373.

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The quest for the lighter materials have motivated the researchers worldwide to develop a newer composites. with the discovery of carbon nanotubes, a class of novel material it has been possible to fabricate the components for the field of automotive and aircraft industries where the strength to weight ratio becomes prominent. In the present work the Al7075 alloy was reinforced with the electroless Ni coated Multiwalled carbon nanotubes in 2wt%,4wt% and 6wt% the nanocomposites were prepared via die casting technique and the resulting composites were tested for the strength and hardness the tensile strength for 6wt% reinforcement found to be 240Mpa a 33% increase compared to unreinforced composite and micro hardness was as high as 61. The SEM analysis revealed that the improvements in the hardness could be attributed to the carbon atoms inclusion in composite lattices.The finite element analysis was carried out for the idealized composite commercial brake rotor the max stress bearing capacity was 172.74 N/mm2 and max deformation was 1.85x10-5 for the 6wt% of reinforcement. Keywords: nanocomposites, die casting, microhardness, aluminium brake rotors.

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Yang, Ruihua, Weidong Gao i Yuan Xue. "Airflow Characteristics During the Rotor Spun Composite Yarn Spinning Process". Fibres and Textiles in Eastern Europe 25 (31.10.2017): 13–17. http://dx.doi.org/10.5604/01.3001.0010.4621.

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Rotor spun composite yarn shows compound performances when combined with staple fibres and filaments, such as excellent hand feeling as well as extreme elasticity and strength. Air characteristics including pressure and speed are critical factors of the rotor spun composite yarn spinning process. In this paper, air flow characteristics in a rotor composite yarn spinning unit are simulated and analysed by Ansys, and then verified by experiments. The results show that with the same spinning conditions, static pressure within the filament guide tube is lowest: -9 kPa and in rotor around -5 kPa. The speed of the airstream accelerates from the transfer channel inlet to the outlet, and reaches the largest value of 386 m/s at the outlet. As the rotor speed increases, the airflow velocity increases; the static pressure decreases; the breaking strength and CV of the composite yarn increase, and the breaking elongation and hairiness decrease according to the experiment results.

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Chen, Jenn-Yih. "PASSIVITY-BASED PARAMETER ESTIMATION AND COMPOSITE ADAPTIVE POSITION CONTROL OF INDUCTION MOTORS". Transactions of the Canadian Society for Mechanical Engineering 37, nr 3 (wrzesień 2013): 559–69. http://dx.doi.org/10.1139/tcsme-2013-0044.

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In the rotor reference frame, the input-output linearization theory was adopted to decouple the rotor position and rotor flux. We then designed two adaptation laws to estimate the rotor resistance and mechanical parameters of the motor. The passive properties of the negative feedback connection from the rotor flux observer to the rotor resistance estimator, and the position controller were analyzed according to the passivity theorem. The overall control system was proved to be globally stable. Finally, experimental results show that the proposed scheme is robust to the variations of the rotor resistance and load torque disturbances. Furthermore, the estimated parameters can converge to the actual values.

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AHN, Sang Ho, i Jun Hwan JANG. "The structural optimum design of laminated slender beam section with arbitrary material distribution using a genetic algorithm". INCAS BULLETIN 11, nr 1 (5.03.2019): 7–20. http://dx.doi.org/10.13111/2066-8201.2019.11.1.1.

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In this paper, a study on optimum design methodology of a section structure of a composite material rotor blade using genetic algorithm is conducted, in order to calculate repetitive optimum design, analysis of strength, fatigue and vibration on blade section. In the analysis, the minimum mass of the rotor blade was defined as objective function; stress damage index, center of mass on blade section and fatigue life of blade were set as constraints. By applying genetic algorithm, laminate angle and thickness of skin, thickness, location and width of torsion box were established as design variables; the optimum design methodology on section structure of the composite material rotor blade was validated. The integrated design program of the section structure of the composite material rotor blade based on this study deals with designing the optimal rotor blade section which meets the design load and constraints given by the random position of rotor blade. By using blade’s section design variables derived from this, it can be facilitated for basic information on detailed design of rotor blade.

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Aji, I. S., E. S. Zainuddin, Abdan Khalina i S. M. Sapuan. "Optimizing Processing Parameters for Hybridized Kenaf/PALF Reinforced HDPE Composite". Key Engineering Materials 471-472 (luty 2011): 674–79. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.674.

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This work is aimed at achieving optimum processing parameters for Kenaf/PALF/HDPE. Processing parameters like temperature, speed of rotor and duration of composite mixing in an internal mixer were examined. Oven conditioned and unconditioned specimen were prepared and tested. The best tensile strength and tensile modulus were obtained at an optimum processing parameters of 190oC, 40rpm, and 15min for temperature of processing, speed of rotor and duration of mixing respectively, while 190oC, 40rpm and 20min gave the best flexural strength and 190oC, 40rpm and 25min for flexural modulus. Conditioning of composite tends to reduce its tensile modulus while increasing its strength and flexural modulus. All samples were produced at only 10w%(mass) of fibre in the composite at 1:1 and less than 0.3mm fibre ratio and length respectively. Utilization of these parameters according to end requirement can help in achieving optimum mechanical properties on hybridized composites.

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Yao, Xueshi, Meijuan Zhou, Lin Li, Xinghua Zhang, Xiaohua Zhong, Lingchao Zeng i Chunyang Guo. "Structural Design of Hub Motor Based on Bidirectional Excitation". Journal of Physics: Conference Series 2468, nr 1 (1.04.2023): 012172. http://dx.doi.org/10.1088/1742-6596/2468/1/012172.

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Abstract It is analyzed that the hub motor of new energy vehicles.Two kinds of hub motors,the inner rotor and outer rotor are designed. Their stators adopt the radial and axial bidirectional excitation.The rotor’s permanent magnets adopt Halbach distribution, and the magnetic circuit adopts composite magnetic conduction structure.The hub motor of the inner rotor is designed which includes its left stator,right stator and outer stator.The left and right stators are arranged on both sides of the axial direction of the rotor, the outer stator is arranged on the radial top side of the rotor,the three stators are fixedly sealed together,which are composed of composite iron core and coil.The rotor is composed of a yoke and permanent magnets.The permanent magnets of the rotor are pasted on the left and right side of the yoke and the outside of the top ring. The excitation magnetic flux of the three stators are distributed sinusoidally to form a three-way closed circuit.The outer rotor of the hub motor is designed,which T-shaped stator forms the radial and axial bidirectional excitation structure,which is fixedly sealed into an armature by excitation winding, composite material iron core and resin.The composite material iron core is composed of steel fiber reinforced epoxy resin.The rotor is arranged on the outside of the T-shaped stator to form an outer rotor.The T-shaped stator is fixed on the shaft, and the rotor is installed on the shaft by use of bearings. The above two hub motors have high output torque/power density, low heating effect, light weight and simple assembly.They are suitable for electric car series.

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Singh, S. P., i K. Gupta. "Dynamic Analysis of Composite Rotors". International Journal of Rotating Machinery 2, nr 3 (1996): 179–86. http://dx.doi.org/10.1155/s1023621x9600005x.

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An outline of formulation based on a layerwise beam theory for unbalance response and stability analysis of a multi mass, multi bearing composite rotor mounted on fluid film bearings is presented. Disc gyroscopics and rotary inertia effects are accounted for. Material damping is also taken into account. The layerwise theory is compared with conventionally used equivalent modulus beam theory. Some interesting case studies are presented. The effect of various parameters on dynamic behavior and stability of a composite rotor is presented.

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Shahmiri, Farid. "Twin-rotor hover performance examination using overlap tests". Aircraft Engineering and Aerospace Technology 89, nr 1 (3.01.2017): 155–63. http://dx.doi.org/10.1108/aeat-02-2015-0032.

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Purpose The aim of this paper was to experimentally examine twin-rotor hover performance for different rotor overlap ratios at practical rotor loading. Design/methodology/approach The methodology was formed based on data measurements for a designed twin-rotor test model and development of hover performance mathematical models. Thus, measurements were made using a central composite test plan, and then mathematical models for thrust power required power loading (PL) and figure of merit (FM) as functions of collective pitch tip speed; rotor overlap ratio was obtained. In the present paper, the test model consisted of two three-bladed rotors with a diameter of 220 mm and a blade aspect ratio of 16.05. The blades were of a rectangular planform with NACA 0012 cross sections and had no twist or taper. The model was built such that the rear rotor was fixed on the fuselage, and the front rotor could move longitudinally for tests up to about 40 per cent overlap ratio in hover. Findings The best hover aerodynamic efficiency (maximum PL of 14.6 kg/kW) was achieved for non-overlapped rotors at a low value of disc loading (DL) and also at FM of 0.6 at that DL. This result was in agreement with blade element momentum theory predictions. Practical implications Results for the twin-rotor test model can be generalized for actual tandem helicopters through the Reynolds number transformation technique and also some modifications. Originality/value Design and construction of the twin-rotor test model and experimental measurements of hover performance based on an optimal test plan were performed for the first time.

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Holinski, R., i D. Hesse. "Changes at interfaces of friction components during braking". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, nr 9 (1.09.2003): 765–70. http://dx.doi.org/10.1177/095440700321700901.

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The energy generated during the braking procedure needs to be dissipated. As a result of energy adsorption, a number of physical and chemical effects occur that result in surface changes of friction elements. These changes determine the service life of friction components and the effectiveness of brakes. Some of the surface changes are detrimental while others are beneficial for a safe braking procedure. Some changes in interfaces have been studied. In particular, during wet seasons, metallization of brake components is encountered, resulting in surface destruction of brake components. It was found that water decomposes at frictional interfaces during braking. Hydrogen diffuses into the rotor surface, resulting in metallurgical changes. Thin metal foils of alpha-iron are sheared from rotor surfaces and are transferred to composite surfaces. Metallization of pad surfaces results in high noise and wear during braking. Transfer of composite material to the rotor surface leads to the formation of layers which reduces wear of friction elements. Controlled transfer of material is essential for good braking performance. It was found that, at rotor temperatures higher than 500 °C, composite material is no longer transferred to rotor surfaces; rather, the additives in the composite react chemically at rotor surfaces. Decomposition compounds from additives are found on brake discs. Transfer layers and chemical reactions on rotor surfaces have been studied.

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Srinivas, K. "Composite Material for Modern Automobile Industry - A Review". International Journal of Advance Research and Innovation 3, nr 4 (2015): 144–47. http://dx.doi.org/10.51976/ijari.341526.

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The various components where composites can replace conventional metals in automobiles have been discussed in the following paragraphs. The components discussed are the drive shaft, brake rotor, engine valves, body and suspension. Each component the composite used to replace is different from other components because of the specific work carried by each individual component. The final comparison of the composite to the conventional metal in each material showed evident weight reduction and improved efficiency.

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Wojtas, Małgorzata, i Agnieszka Sobieszek. "Gyroplane Rotor Hubs Strength Tests". Journal of KONES 26, nr 3 (1.09.2019): 265–70. http://dx.doi.org/10.2478/kones-2019-0082.

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Abstract In this article a review of rotor, hub constructions were presented. Discussed rotor’s hub is made of composite or aluminum alloys materials. Two types of rotor hub were presented (four-blades and two-blades teetering rotor hub), each of them are dedicated to gyroplanes. Typical gyroplane main rotors are characterized by simple design, especially in case of rotors for light gyroplanes. In the following part of the article the type of strength tests required by certification process were shown. The test programs based on legal aspects of admission to the flight tests taking into account legislation such as CS 27 (Subpart C – Strength Requirements), CAP 643 British Civil Airworthiness requirements Section T Light gyroplanes, ASTM F2972. Furthermore, this article discusses strength tests of gyroplane rotor hub such as measured parameters, methodology of measurement, types of sensors, course of test, test stands, and limit loads. The loads during “pull-up from level flight” manoeuvre are limit loads during tests. Required additional processes, like a verification the same parameters by two types of method were shown i.e. deformation of structure were tested by strain gauges and reverse engineering. Strength tests had to be made before flight test, based on results of them aircrafts are flight authorized. In conclusion, the results of tests were presented and fulfilment of legal assumptions and requirements were shown.

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Chen, Ying-Chung, Xu Feng Cheng i Siu-Tong Choi. "Dynamic analysis of a helical geared rotor-bearing system with composite rotating shafts". Aircraft Engineering and Aerospace Technology 93, nr 10 (29.10.2021): 1699–708. http://dx.doi.org/10.1108/aeat-04-2021-0095.

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Purpose This study aims to study the dynamic characteristics of a helical geared rotor-bearing system with composite material rotating shafts. Design/methodology/approach A finite element model of a helical geared rotor-bearing system with composite material rotating shafts is developed, in which the rotating shafts of the system are composed of composite material and modeled as Timoshenko beam; a rigid mass is used to represent the gear and their gyroscopic effect is taken into account; bearings are modeled as linear spring-damper; and the equations of motion are obtained by applying Lagrange’s equation. Natural frequencies, mode description, lateral responses, axial responses, lamination angles, lamination numbers, gear mesh stiffness and bearing damping coefficients are investigated. Findings The desired mechanical properties could be constructed using different lamination numbers and fiber included angles by composite rotating shafts. The frequency of the lateral module decreases as the included angle of the fibers and the principal shaft of the composite material rotating shaft increase. Because of the gear mesh stiffness increase, the resonance frequency of the coupling module of the system decreases, the lateral module is not influenced and the steady-state response decreases. The amplitude of the steady-state lateral and axial responses gradually decreases as the bearing damping coefficient increases. Practical implications The model of a helical geared rotor-bearing system with composite material rotating shafts is established in this paper. The dynamic characteristics of a helical geared rotor-bearing system with composite rotating shafts are investigated. The numerical results of this study can be used as a reference for subsequent personnel research. Originality/value The dynamic characteristics of the geared rotor-bearing system had been reported in some literature. However, the dynamic analysis of a helical geared rotor-bearing system with composite material rotating shafts is still rarely investigated. This paper shows some novel results of lateral and axial response results obtained by different lamination angles and different lamination numbers. In the future, it makes valuable contributions for further development of dynamic analysis of a helical geared rotor-bearing system with composite material rotating shafts.

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Park, Sang Dae, Mitsugu Todo, Kazuo Arakawa i Yasuharu Takenoshita. "Effect of Mixing Process on the Fracture Behavior of HA/PLLA Composite Material". Key Engineering Materials 297-300 (listopad 2005): 2453–58. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2453.

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Effect of mixing process on the fracture behavior of HA/PLLA Composites were investigated. Fracture toughness values of HA/PLLA composites prepared under different mixing time and rotor speed were measured. The fracture surface morphology was also examined by scanning electron microscopy. It was found that the fracture toughness of HA/PLLA composite decreases due to decrease of ductile deformation of PLLA matrix and debonding of interfaces with increase of the rotor speed and mixing time. Effect of mixing process on neat PLLA was also assessed, and it was found that the fracture toughness of PLLA decreases due to such pocess. Disappearance of multiple craze formation and thermal degradation were found to be the primary mechanisms of the toughness degradation.

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Chen, Jenn Yih. "Passivity-Based Parameter Estimation and Position Control of Induction Motors via Composite Adaptation". Applied Mechanics and Materials 284-287 (styczeń 2013): 1894–98. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1894.

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This paper proposes the parameters estimation and position control of an induction motor drive by using the composite adaptation scheme. First, in the rotor reference frame, the input-output linearization theory was employed to decouple the mechanical rotor position and the rotor flux amplitude at the transient state. An open-loop current model rotor flux observer was utilized for estimating the flux, and then the adaptive laws for estimating the rotor resistance, moment of inertia, viscous friction coefficient, and load torque. The passive properties of the flux observer, rotor resistance estimator, and composite adaptive position controller were analyzed based on the passivity theorem. According to the properties, the overall position control system was proved to be globally stable without using Lyapunov-type arguments. Experimental results are finally provided to show that the proposed method is robust to variations of the motor mechanical parameters, rotor resistance, and load torque disturbances. Moreover, good position tracking response and characteristics on parameter estimation can be achieved.

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Filippatos, Angelos, Albert Langkamp i Maik Gude. "Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Simulation Assessment". Materials 11, nr 12 (3.12.2018): 2453. http://dx.doi.org/10.3390/ma11122453.

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Fibre-reinforced composite structures under complex loads exhibit gradual damage behaviour with degradation of effective mechanical properties and change of their structural dynamic behaviour. In case of composite rotors, this can lead to catastrophic failure if an eigenfrequency is met by the rotational speed. The description and simulation analysis of the gradual damage behaviour of composite rotors therefore provides the fundamentals for a first understanding of complex and partially-unpredicted structural phenomena. Therefore, a simulation tool is developed using a finite element model, which calculates the damage-dependent structural dynamic behaviour of selected composite rotors considering both damage initiation and in-plane damage evolution due to a combination of out-of-plane and in-plane loads. Damage initiation is determined using failure criteria, whereas the gradual damage evolution using a validated continuum damage mechanics model. Numerical results are compared with experimental results for rotor-typical stress states to assess the model quality, which could be later used for damage identification approaches.

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Liu, Zhihao, Renren Wang, Fang Cao i Pidong Shi. "Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method". Shock and Vibration 2020 (14.08.2020): 1–18. http://dx.doi.org/10.1155/2020/8888504.

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The stable operation of a high-speed rotating rotor-bearing system is dependent on the internal damping of its materials. In this study, the dynamic behaviours of a rotor-shaft system with internal damping composite materials under the action of a temperature field are analysed. The temperature field will increase the tangential force generated by the internal damping of the composite material. The tangential force will also increase with the rotor speed, which can destabilise the rotor-shaft system. To better understand the dynamic behaviours of the system, we introduced a finite element calculation model of a rotor-shaft system based on a 3D high-order element (Solid186) to study the turbocharger rotor-bearing system in a temperature field. The analysis was done according to the modal damping coefficient, stability limit speed, and unbalance response. The results show that accurate prediction of internal damping energy dissipation in a temperature field is crucial for accurate prediction of rotor dynamic performance. This is an important step to understand dynamic rotor stress and rotor dynamic design.

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Ji, Qing Shan, i Hong Yan Hao. "A Composite Approach of Sensorless Rotor Position Sensing for Brushless DC Motor". Advanced Materials Research 230-232 (maj 2011): 877–83. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.877.

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The principles and characteristics of the sensorless brushless DC motor rotor position detection were analyzed by using inductive method and third harmonic back-EMF detection method. A composite rotor position detection method was proposed in full speed range (including zero speed). At zero speed (static state) inductive method was used to determine the initial rotor position, and it was bases of starting and controlling for the brushless DC motor; at low speed third harmonic back EMF detection method was used. Analysis shows that the composite test method can estimate the rotor position, and it is to achieve the position sensorless brushless DC motor to run a viable method.

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Han, Xue Zheng, i Cai Jun Liu. "Mixing Short Fiber-Rubber Composite by New Rotor with Variable Clearance". Advanced Materials Research 744 (sierpień 2013): 301–5. http://dx.doi.org/10.4028/www.scientific.net/amr.744.301.

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The mixing mechanism of short fiber/rubber composite was analyzed. The clearance between the rotor edge peak and mixing chamber influenced mixing, dispersion and length of the short fibers in compound. The new rotor was designed with variable clearance. The large clearance gap improve the mixing, and the small clearance gap helped to improve the dispersion of short fiber. The mixing quality and performance of short fiber/rubber composite were improved by using the new rotor, and the production efficiency increased.

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Jung, Sung Nam, V. T. Nagaraj i Inderjit Chopra. "Assessment of Composite Rotor Blade Modeling Techniques". Journal of the American Helicopter Society 44, nr 3 (1.07.1999): 188–205. http://dx.doi.org/10.4050/jahs.44.188.

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Li, Leihong, Vitali V. Volovoi i Dewey H. Hodges. "Cross-Sectional Design of Composite Rotor Blades". Journal of the American Helicopter Society 53, nr 3 (2008): 240. http://dx.doi.org/10.4050/jahs.53.240.

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Murugan, Senthil, Ranjan Ganguli i Dinesh Kumar Harursampath. "Stochastic Aeroelastic Analysis of Composite Helicopter Rotor". Journal of the American Helicopter Society 56, nr 1 (1.01.2011): 12001–1200113. http://dx.doi.org/10.4050/jahs.56.012001.

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TANG Ji-qiang, 汤继强, 张永斌 ZHANG Yong-bin i 赵丽滨 ZHAO Li-bin. "Interference fitted metal-composite material flywheel rotor". Optics and Precision Engineering 21, nr 10 (2013): 2639–47. http://dx.doi.org/10.3788/ope.20132110.2639.

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Hodges, Dewey H. "Erratum: ReFiew of Composite Rotor Blade Modeling". AIAA Journal 28, nr 6 (czerwiec 1990): 1152. http://dx.doi.org/10.2514/3.48885.

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Chang, Seung Hwan, Dai Gil Lee i Jin Kyung Choi. "Composite rotor for high-speed induction motors". Composite Structures 50, nr 1 (wrzesień 2000): 37–47. http://dx.doi.org/10.1016/s0263-8223(00)00068-4.

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