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Journal articles on the topic 'Software Helical'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Ainger, AWS, and F. Schmid. "The helical approach to software design." Computer Integrated Manufacturing Systems 8, no. 2 (1995): 105–15. http://dx.doi.org/10.1016/0951-5240(95)00004-d.

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Wang, Jun Gang, Yong Wang, Yan Tao An, Qi Lin Huang, and Mao Lin Xu. "Research on Natural Characteristics of Helical Gear in Gearbox for Wind Turbine Generator." Key Engineering Materials 474-476 (April 2011): 2054–57. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.2054.

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The three-dimensional helical gear model based on the geometric parameters is created by using software called PROE3.0. The natural characteristics of helical gear are analyzed by using the finite element method. The natural frequency of the helical gear is calculated by the software ANSYS and the principal mode of vibration is discussed. There are four vibration modes, which are circular vibration, torsional vibration, radial vibration and umbrella vibration. The phenomenon of resonance of the helical gear can be avoided by choosing suitable parameters and changing the natural frequency of the helical gear.

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Matulewicz, L., and K. Slosarek. "Evaluation of Transit Dosimetry Software for Helical Tomotherapy." International Journal of Radiation Oncology*Biology*Physics 90, no. 1 (2014): S739—S740. http://dx.doi.org/10.1016/j.ijrobp.2014.05.2151.

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Guan, Li Kun, and Ning Ning Wang. "Fracture Reason Analysis for Helical Gear Shaft of Converter Tilting Mechanism Senior Reducer." Advanced Materials Research 605-607 (December 2012): 824–27. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.824.

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A steel works 210 tons basic oxygen furnace tilting mechanism senior reducer high-speed helical gear shaft fracture. In order to find fractured reason, the static strength analysis of helical gear shaft were conducted by the finite element analysis software ANSYS, get the amount of deformation and stress distribution of helical gear shaft. On the basis of this result, based on fatigue cumulative damage theory and the concept of fatigue failure ensure it is fatigue fracture. The results of Static strength analysis provides important data to calculate fatigue life of helical gear shaft by fatigue analysis software, and Provides a theoretical basis for reliability design of helical gear shaft.

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Rogatinskiy, Roman, Ivan Hevko, Andriy Gypka, Oksana Garmatyk, and Sergiy Martsenko. "Feasibility Study of the Method Choice of Manufacturing Screw Cleaning Elements with the Development and Use of Software." Acta Technologica Agriculturae 20, no. 2 (2017): 36–41. http://dx.doi.org/10.1515/ata-2017-0007.

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Abstract computer simulation of a curved profile formation on a helical spiral was carried out. A feasibility study was conducted in order to choose the method suitable for manufacturing of L-shaped helical spirals using specially developed software for calculating of the costs of helical spiral formation processes. The tables presenting technological characteristics of the design parameters of screw coiling working bodies manufactured by different methods are provided. The production costs for 1 meter of helical spiral with a curved profile manufactured by different methods are calculated. Theoretical and experimental investigations proved that the most cost-effective method of L-shaped helical spiral manufacturing is to coil it along the inner face from rectangular pieces with simultaneous or subsequent shelve formation.

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Papanikolaou, Nikos, Weihong He, Luis A. Vazquez Q, Alonso Gutierrez, Sotirios Stathakis, and Hassaan Alkhatib. "MU-Tomo: Independent Dose Validation Software for Helical TomoTherapy." Journal of Cancer Science & Therapy 02, no. 05 (2010): 145–52. http://dx.doi.org/10.4172/1948-5956.1000040.

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Xiao, Da Zhun, Ke Bing Li, Zhi Qiang Wang, and Dian Min Liu. "Computer aided design software package for conjugate helical surfaces." Journal of Materials Processing Technology 61, no. 1-2 (1996): 72–77. http://dx.doi.org/10.1016/0924-0136(96)02468-5.

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Wang, Zhen, Ming Hu Jiang, Ping Tao Hou, Qing Jiao Sheng, and Li Xin Zhao. "Numerical Simulation of a Helical Pipe Coalescence Device." Advanced Materials Research 516-517 (May 2012): 1062–65. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1062.

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A model of coalescing helical pipe is established through the analysis to the oil phase in continuous water phase inside a helical pipe, by using Fluent software. The influence of structural parameters and operation parameters of helical pipes on oil droplet coalescing effect is verified. Results show that the oil drop coalescing effect increases with the rise of gyration radius and number of turns of helical pipe, and decreases with the rise of the helical pipe diameter and inlet velocity.

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Rahman, Hammad, Rehan Jamshed, Aurangzeb Khan, Hassan Ijaz, and Li Min. "Design of Tape Wound Composite Cylindrical Shells Incorporating Different Failure Criteria and Winding Kinematics." Advanced Materials Research 570 (September 2012): 53–62. http://dx.doi.org/10.4028/www.scientific.net/amr.570.53.

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Internally pressurized tape wound composite shells of revolution with plugged ends are immensely utilize in commercial and aerospace applications. The focus of present endeavor is the realistic design of composite shells. A balanced symmetric stacking sequence of glass/epoxy has been considered. Its mechanical properties are determined from the experimental testing of flat plate samples as per ASTM standards. Netting analysis is then performed to find out the winding angles and hoop/helical layers contribution for optimum structural performance and higher efficiencies. The winding kinematics has been comprehended from the developed surface of the composite cylindrical shell and it has elucidated that each helical layer results from the interlacing of two plies with alternate angles of + θ and θ to the shell meridian. These helically interlaced layers are responsible for the creation of triangular shaped flip flop patterns which run both across the circumference as well as along the shell meridian. These characteristic patterns of helical winding known as mosaic patterns are not generally incorporated in the design calculations which are normally based on mechanics of composite laminates. Their pronounce effect in altering the transverse fiber stress is presented in the present study. The influence of mosaics in the presence of hoop layers is targeted for the first time hence the laminate that has been analyzed comprise of both hoop layers and helical layers with mosaic patterns. A software code has been developed in MATLAB using classical laminate plate theory (CLPT) incorporated with different failure criteria. Range of burst pressures based on different failure criteria has been plotted. Results of MATLAB code and FEA based ANSYS software, are in close agreement.

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Huang, Y. "WEB-THERMODYN: sequence analysis software for profiling DNA helical stability." Nucleic Acids Research 31, no. 13 (2003): 3819–21. http://dx.doi.org/10.1093/nar/gkg562.

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Li, Ning, Wei Li, Ning Liu, and Hua Gang Liu. "Analytical Method on Contact Stress of Helical Gear with Asymmetric Involutes." Advanced Materials Research 321 (August 2011): 157–60. http://dx.doi.org/10.4028/www.scientific.net/amr.321.157.

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Helical gear with asymmetric involutes is a new kind gear which driving side surface is large pressure angle profile. The numbers of meshing tooth are discussed during helical gear pair meshing process, thus the length of total contact lines is determined easily. It is difficult to calculate contact stress by existing formula because this kind gear is non-standard. A calculating formula is derived which can calculate contact stress of helical gear with asymmetric involutes in this paper. A computer’s software is written in order to calculate instantaneous contact stress of contact line. Contact stress is compared between symmetric helical gear and asymmetric helical gear.

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Tan, Chung Ming, and Gin Yei Lin. "Study on Roll Forming of Reel Mower Helical Blades." Key Engineering Materials 703 (August 2016): 39–43. http://dx.doi.org/10.4028/www.scientific.net/kem.703.39.

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This research is focused on the helical blades used in the reel mower machine which uses 5 to 10 helical blades. These blades are normally manufactured using the roll forming process which has certain tolerance. This research is to develop an iterative methodology to optimize the manufacture of blades using roll forming. To save cost, time and waste of material the computerized simulation process is being used. The design of the blade and the die for the roll forming and modification are done using software SolidWorks. Simulation is performed using software DEFORM-3D. The simulation result and the actual design are compared using software Geomagic. This study also shows the potential applications of computer aided engineering and its benefits in verifying and reinventing the part manufacturing process.

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Qin, Xu Da, Qi Wang, H. Y. Wang, and Song Hua. "Dynamic Analysis of Helical Milling Unit Based on Virtual Machine Tool." Advanced Materials Research 188 (March 2011): 463–68. http://dx.doi.org/10.4028/www.scientific.net/amr.188.463.

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The virtual prototype is a computer simulation model of the physical product that can be analyzed like a real machine. This paper studies the helical milling unit based on the virtual machine tool. The helical milling unit is first designed according to the kinematics of the helical milling. The main parts of the equipment include rotating mechanism, orbital agency and radial offset organization. Based on the feasibility analysis of the structure, the three-dimensional geometrical model is built in the Solidworks software. The key parts in the model are separated from the device and introduced into the finite element analysis (FEA) software, according to the cutting loads tested from experiment, static and dynamic modal analysis and harmonic response analysis are carried out for the key parts of this device. The results show that the static and dynamic stiffness can meet design requirement.

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Mi, Xiao. "Research Based on CFD for Helical Intake Port Position Defect of Diesel Engines." Advanced Materials Research 998-999 (July 2014): 454–57. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.454.

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This paper realized the 3-dimension model for helical intake port and simulated the different kinds of position deviations by the application of reverse engineering. The three-dimensional flow field in port-cylinder was numerically simulated by the use of CFD software FIRE to verify how the position deviations affect the performance of the helical intake port. The result shows that the slanting and translational position deviations have the marked effect on the swirl ratio of the helical intake port and the strict control of production precision is needed.

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Yang, Hsueh-Cheng, and Wen-Jun Liang. "A helical gear with discrete ring-involute teeth." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 8 (2019): 1554–68. http://dx.doi.org/10.1177/0954406219893392.

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

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Wang, A. Cheng, Kuan Yu Chen, Ken Chuan Cheng, and H. H. Chiu. "Elucidating the Effects of Helical Passageways in Abrasive Flow Machining." Advanced Materials Research 264-265 (June 2011): 1862–67. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1862.

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Conventional AFM have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this work develops mechanism designs for different passageways to obtain multiple flowing paths of an abrasive medium, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. The motion of the abrasive medium is studied by utilizing the design of the mold cores, which mold shapes include the circular passageway and helical passageway. The optimum design of the different passageways is then verified using CFD-ACE+ numerical software. Analytical results indicate that the optimum design is the mechanism with a passageway of six helices. Furthermore, surface roughness measurements demonstrate the increase in uniformity and the roughness improvement rate (RIR). Experimental results for surface roughness indicate that roughness deviation of six helices passageway of approximately 0.1001 m Ra is significantly better than those on a circular passageway of around 0.1760 m Ra. Additionally, the six helices passageway is also superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 85% compared with RIR 75% for the circular passageway.

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Tan, Chung Ming, and Gin Yei Lin. "An Innovative Compression Mold Design for Manufacture of Reel Mower Helical Blades." Applied Mechanics and Materials 851 (August 2016): 255–58. http://dx.doi.org/10.4028/www.scientific.net/amm.851.255.

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This research is focused on the helical blades used in the reel mower machine which uses 5 to 10 helical blades. These blades are normally manufactured using the roll forming process which has certain demerits. This research is done to develop a new process known as compression process for the manufacture of blades using computer aided engineering. To save cost, time as well as waste of material the computerized simulation process is being used. The design of the blade and the die for the compression and modification are done using software SolidWorks. Simulation is performed using software DEFORM-3D. The simulation result and the actual design are compared using software Geomagic. This study also shows the potential applications of computer aided engineering and its benefits in verifying and reinventing the part manufacturing process.

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Abbasian Arani, Ali Akbar, and Hamed Uosofvand. "Improving shell and tube heat exchanger thermohydraulic performance using combined baffle." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 8 (2019): 4119–40. http://dx.doi.org/10.1108/hff-06-2019-0514.

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Purpose This paper aims to investigate the fluid flow and heat transfer of a laboratory shell and tube heat exchanger that are analyzed using computational fluid dynamic approach by SOLIDWORKS flow simulation (ver. 2015) software. Design/methodology/approach In this study, several types of baffle including segmental baffle, butterfly baffle, helical baffle, combined helical-segmental baffle, combined helical-disk baffle and combined helical-butterfly baffle are examined. Two important parameters as the heat transfer and pressure drop are evaluated and analyzed. Based on obtained results, segmental baffle has the highest amount of heat transfer and pressure drop. To assess the integrative performance, performance coefficient defines as “Q/Δp” is used. Findings This investigation showed that among the presented baffle types, the heat exchangers equipped with disk baffle has the highest heat transfer. In addition, in the same mass flow rate, the performance coefficient of the shell and tube heat exchanger equipped with helical-butterfly baffle is the highest among the proposed models. Originality/value After combined helical-butterfly baffle the butterfly baffle, disk baffle, helical-segmental baffle and helical-disk baffle show their superiority of 35.12, 25, 22 and 12 per cent rather than the common segmental baffle, respectively. Furthermore, except for the combined helical-disk baffle, the other type of combined baffle have better performance compare to the basic configuration (butterfly and segmental baffle).

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Shen, Jiang Li, Qiang Liu, Song Mei Yuan, and Yi Qing Yang. "Research on a Generalized Simulation Algorithm for Cutting Forces Prediction of Helical Milling and its Implementation." Advanced Materials Research 562-564 (August 2012): 793–98. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.793.

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This paper presents a generalized simulation algorithm for cutting forces prediction of helical milling. Calculating cutting thickness and the transition of coordinate system are the key points. The average cutting coefficient model is adopted. The simulation algorithm and related software are developed. It can predict cutting forces for inner and outer circle of helical milling. The validation and accuracy of the simulation algorithm has been verified by experiments.

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Wang, Jun Gang, Yong Wang, Yan Tao An, and Qi Lin Huang. "Sensitivity Analysis of Natural Frequency to Structural Parameters of Helical Gear Shaft for Wind Turbine Gearbox." Applied Mechanics and Materials 86 (August 2011): 380–83. http://dx.doi.org/10.4028/www.scientific.net/amm.86.380.

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This paper takes a helical gear shaft as research subject and discusses the main structural parameters to see how it would affect natural frequency sensitivity. The parametrical model of helical gear shaft is created by using software PROE3.0. The natural frequencies and vibration shapes are calculated by the modal analysis. The relationship between the structural parameters and the natural frequency sensitivity can be obtained by means of ANSYS. The result shows that the structural parameters can affect the natural frequency sensitivity. The variation in low order natural frequency is similar to that in high order natural frequency. The effect of module on the natural frequency sensitivity is more remarkable comparing with pressure angle, modification coefficient and helical angle. Selecting structural parameters reasonably may reduce vibration and noise of the helical gear shaft effectively.

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Kuang, Yuchun, Wei Lin, Zongzheng Dong, Longmei Wu, and Qin Wang. "A cutter path generation strategy for helical surface machining of screw rotor." Science Progress 103, no. 1 (2019): 003685041988218. http://dx.doi.org/10.1177/0036850419882180.

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In this article, the disk mill cutter path generation strategy for the machining of complex helical surface via a currently developed minimal orientation-distance algorithm based on spatial discretization method is studied. The strategy proposed here is, first, to establish the helical surface and cutting surface in the unique coordinate system. Then, the two surfaces are divided into a series of parts by n equidistant planes, and the minimal orientation-distance algorithm is used to determine all the cutter locations. Finally, on the basis of Archimedes helical interpolation, cutter path is generated within the specified tolerance limit. The effectiveness of the proposed strategy is confirmed numerically and experimentally by a case of virtual cutting test in VERICUT software and actual machining. This strategy can be applied to a broad range of helical surface machining.

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Razooqi, Ahmed Ibrahim, Hani Aziz Ameen, and Kadhim Mijbel Mashloosh. "Compression and impact characterization of helical and slotted cylinder springs." International Journal of Engineering & Technology 3, no. 2 (2014): 268. http://dx.doi.org/10.14419/ijet.v3i2.2492.

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Helical and slotted cylinder springs are indispensable elements in mechanical engineering. This paper investigates helical and slotted cylinder springs subjected to axial loads under static and dynamic conditions. The objective is to determine the stiffness of a circular cross-section helical coil compression spring and slotted cylinder springs with five sizes and dynamic characteristics. A theoretical and finite element models are developed and presented in order to describe the various steps undertaken to calculate the springs stiffnesses. Five cases of the springs geometric are presented. A finite element model was generated using ANSYS software and the stiffness matrix evaluated by applying a load along the springs axis, then calculating the corresponding changes in deformation. The stiffness is obtained by solving the changes of load and deformation. The natural frequencies, mode shapes and transient response of springs are also determined. Finally, a comparison of the stiffnesses are obtained using the theoretical methods and those obtained from the finite element analysis were made and good agreement are evident and it can be found that the stiffness of spring for the slotted cylinder spring is much larger than that for helical spring and the stiffness for slotted cylinder spring increases with the number of slots per section. Natural frequencies, mode shape and transient response of helical spring and slotted cylinder spring have been represented in ANSYS software and results have been compared and it found that the natural frequency has also increased in the same proportion of stiffness because the natural frequency is directly proportional to the stiffness for all the cases that have been studied. Keywords: ANSYS, Finite Element Analysis, Helical Spring, Slotted Cylinder Spring, Stiffness.

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Xia, Wen Ting, Hua Jie Mao, Lin Hua, and Yan Xiong Liu. "Numerical Study on the Comparison of Deformation Characteristics during the Fine Blanking Process of Spur Gears and Helical Gear." Key Engineering Materials 639 (March 2015): 559–66. http://dx.doi.org/10.4028/www.scientific.net/kem.639.559.

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As important transmission components, helical gears have been widely applied to mechanical and automotive fields. The traditional manufacturing process for helical gears is machining, which is time-consuming and result in the high cost of gears. In order to improve the production efficiency and product quality of helical gears, a novel forming process principle for the fine blanking of helical gears was developed. In this study, reliable three-dimensional (3D) rigid-plastic finite element (FE) models of single tooth and complete gears were set up and investigated using the software Deform-3D, the deformation characteristics of fine blanking of spur gears and helical gears were compared. Based on the valid numerical models, variation tendency of different field variables such as damage material flow velocity, and mean stress were obtained, as well as the feature of the tooth section, which provides a better understanding of the deformation mechanism of rotational fine blanking process.

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Haryanto, Dedy, Ainur Rosidi, Giarno Giarno, G. Bambang Heru K., Susyadi Susyadi, and Mulya Juarsa. "ANALISIS UNJUK KERJA RANCANGAN STEAM CONDENSATION TANK BERBASIS SIMULASI SOFTWARE." SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir 25, no. 1 (2021): 32. http://dx.doi.org/10.17146/sigma.2021.25.1.6316.

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Steam condensation tank merupakan salah satu komponen pada fasilitas Passive Helical Coil Condensation System (PaHCCS) pada PASCONEL yang berfungsi sebagai kondensor uap bertekanan. Steam condensation tank didesain menggunakan tube stainless steel 304 (SS 304) dengan diameter luar 600 mm dan ketebalan 9,53 mm serta ketinggian total 2970,8 mm. Steam condensation tank dioperasikan pada tekanan 20 bar, temperatur diatas 100°C dan dilengkapi dengan helical coil tube sebagai pengambil kalor pada uap bertekanan. Simulasi unjuk kerja rancangan steam condensation tank ini bertujuan untuk mengetahui keselamatan dan keamanan saat dioperasikan. Analisis unjuk kerja dilakukan menggunakan software CATIA, dimana pemodelan 3-dimensi rancangan steam condensation tank dioperasikan secara simulasi dengan 1,5 kali dari tekanan dan temperatur operasional. Hasil analisis kekuatan mekanik mendapatkan tegangan mekanik terbesar sebesar 9,57 x 107 N/m2 pada bagian tengah shell rancangan steam condensor tank. Tegangan mekanik tersebut tidak berdampak pada rancangan steam condensor tank berbahan SS 304 karena besar tegangan mekanik yang terjadi lebih kecil daripada yield strength material SS 304 yaitu sebesar 1,73 x 108 N/m2 dan masih berada didaerah elastisnya . Translational displacement maksimal yang terjadi pada rancangan steam condensor tank sebesar 6,2 mm adalah sangat kecil dan 1/500 dari ukuran total panjang rancangan steam condensor tank. Dengan demikian rancangan steam condensor tank aman untuk digunakan sebagai sarana penelitian.Kata kunci: Steam Condensation Tank, PASCONEL, tegangan mekanik, translational displacement

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Powell, A., and J. Rossignac. "ScrewBender: Smoothing Piecewise Helical Motions." IEEE Computer Graphics and Applications 28, no. 1 (2008): 56–63. http://dx.doi.org/10.1109/mcg.2008.14.

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Somani, Arun K., and Sanjay Thatte. "The helical cube network." Networks 26, no. 2 (1995): 87–100. http://dx.doi.org/10.1002/net.3230260204.

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Chu, James. "\"Found\" in Space - Helical Resonator Filters for Satellite Communication [Book\/Software Reviews]." IEEE Microwave Magazine 16, no. 11 (2015): 80–82. http://dx.doi.org/10.1109/mmm.2015.2478089.

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Khan, Inammullah. "Design of an Innovative Helical Antenna for Aerial Platforms to Enable Jam Resistant Reception of GNSS Signals." SISTEMASI 8, no. 2 (2019): 233. http://dx.doi.org/10.32520/stmsi.v8i2.467.

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This paper describes the design of a helical antenna at GPS upper L band frequency. Helical antennas are widely used in airborne and space borne applications to receive GNSS signals. One major concern in reception of GNSS signals is their susceptibility to jamming signals. To address this problem a novel antenna design is proposed in this paper. The proposed design provides lower side lobe levels than conventional helical antennas, without compromising efficiency of the antenna. The lower side lobe levels are the key feature in making the antenna less susceptible to jamming signals. Moreover, despite being smaller than classically designed helical antennas this design can handle relatively more power. To achieve these results the key parameters of helical antennas, namely, dimensions and shape of helix antenna i.e. height, radius, number of turns, thickness as well as pitch angle were optimized. In addition, the ground effect was used to supplement the desired results. Detailed simulation results using CST Microwave Studio software have been computed. These results are then compared with the results for standard helical antenna to validate and verify the advantage of using the proposed design.

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Budnik, Krzysztof, and Wojciech Machczyński. "Magnetic field of complex helical conductors." Archives of Electrical Engineering 62, no. 4 (2013): 533–40. http://dx.doi.org/10.2478/aee-2013-0043.

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Abstract Transmission of the electric power is accompanied with generation of low - frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Unfortunately, many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of the twisted-wire pair used in telephone communication; already practiced is twisting of insulated high-voltage three phase power cables and single-phase distribution cables as well. The paper presents a theoretical study of the calculation of magnetic fields in vicinity of conductors having helical structure. For the helical conductor with finite length the method is based on the Biot-Savart law. Since the lay-out of the cables is much more similar to a broken line than to strait line, in the paper the magnetic flux densities produced by helical conductor of complex geometry are also derived. The analytical formulas for calculating the 3D magnetic field can be used by a software tool to model the magnetic fields generated by e.g. twisted wires, helical coils, etc.

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Li, Shouying, Yangchen Deng, Wei Zhong, and Zhengqing Chen. "On the aerodynamic characteristics of stay cables attached with helical wires." Advances in Structural Engineering 21, no. 9 (2017): 1262–72. http://dx.doi.org/10.1177/1369433217739707.

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To investigate the aerodynamic characteristics of stay cables attached with helical wires, a series of wind tunnel tests and computational fluid dynamics simulations were both carried out on the smooth and helical-wire cable models. The diameters of helical wires include 2, 3, and 4 mm, and the distances between adjacent helical wires include 200, 300, and 600 mm. Pressure taps were uniformly arranged on seven cross sections of the cable models. First, wind tunnel tests including 50 test cases were conducted to measure the wind forces and wind pressures on the cables using the forced vibration system in HD-2 wind tunnel. The effects of the helical wires on the mean and fluctuating aerodynamic forces and the correlation coefficients along the cable axis were investigated in detail based on the experimental data. Second, large Eddy simulation module incorporated in software FLUENT® was used to simulate the aerodynamic forces on the smooth and helical-wire cables. The parameters of the cable and the helical wire are similar to those used in the wind tunnel tests. The results show that helical wires can attenuate vortex shedding and reduce the wind pressure correlation along the cable axis. Within the Reynolds number range from 0.4 × 105 to 1.6 × 105, the mean drag force of the helical-wire cable is lower than the value of the smooth cable, and the correlation coefficient decreases with the increase in wind velocity. The results obtained from wind tunnel tests and computational fluid dynamics simulations agree well with each other. Furthermore, the wind velocity contour around the helical-wire cables obtained from computational fluid dynamics simulations visually indicates that the approaching flow is forced to separate at the surface of the helical wire in advance, which makes the vortex shedding disorder along the cable axis.

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Su, Daizhong, Shuyan Ji, Nariman Amin, and J. B. Hull. "Multi‐user Internet environment for gear design optimization." Integrated Manufacturing Systems 14, no. 6 (2003): 498–507. http://dx.doi.org/10.1108/09576060310491360.

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A Web‐based multi‐user system has been developed to remotely execute a large size software package via the Internet. The software implements a genetic algorithm to optimize the design of spur and helical gears. To accomplish this, a combination of HTML, Java servlets, Java applets, Java Script and HTTP protocol has been employed.

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Li, Hua Jie, and Yun Zhao. "Finite Element Analysis of Cross Helical Gear Transmission Based on ANSYS Workbench." Applied Mechanics and Materials 189 (July 2012): 406–10. http://dx.doi.org/10.4028/www.scientific.net/amm.189.406.

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FEA software ANSYS Workbench is used for the static finite element analysis of a cross helical gear meshing model, the stress, strain, and the factor of safety on this model are calculated. Modal analysis with 6 main natural frequencies and vibration shape is conducted and analyzed to study dynamic characteristics of the transmission line. This work provides a reliable reference to design a high reliable system of crossed helical gear transmissions for our new developed tool head in multifunction lathe.

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Pérez, Zorany Agudelo, José Antonio Schiavon, Cristina de Hollanda Cavalcanti Tsuha, Daniel Dias, and Luc Thorel. "Numerical and experimental study on influence of installation effects on behaviour of helical anchors in very dense sand." Canadian Geotechnical Journal 55, no. 8 (2018): 1067–80. http://dx.doi.org/10.1139/cgj-2017-0137.

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The use of helical anchors has been increasing in recent years; however, the current understanding of its behaviour does not allow for reliable estimates of uplift capacity and load–displacement response. The need for improvement of the design methods has motivated the present study, which investigates the effect of installation on the helical anchor response in very dense sand. This work is divided into three parts. The first part describes the results of centrifuge model tests and microtomographic analysis performed to examine the uplift response of a single-helix anchor and the soil disturbance caused by the installation process. The aim of these tests was to define appropriate hypotheses for the numerical prediction of helical anchor performance. In the second part, the load–displacement curve of a tested helical anchor was numerically simulated with the finite difference software FLAC3D, considering the installation effect observed experimentally. In the third part of the paper, the adjusted numerical model was used in a parametric analysis to provide some guidelines for the design of helical anchors in dense sand. Additionally, from the results of the numerical investigation and experimental observations, two different approaches are presented for improving the accuracy of analytical predictions of helical anchor capacity. Both suggested methods showed good agreement with centrifuge and field testing data.

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Zeain, Mohammed Yousif, M. Abu, Z. Zakaria, et al. "Design of a wideband strip helical antenna for 5G applications." Bulletin of Electrical Engineering and Informatics 9, no. 5 (2020): 1958–63. http://dx.doi.org/10.11591/eei.v9i5.2055.

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This paper presents the design of wideband strip helical antenna for 5G Application. The strip helical antenna is designed for 5G and wideband applications that provide a wide bandwidth and circular polarization. The helical antenna is planned on at 5.8 GHz frequency by using Teflon material. The new designed strip is printed on a substrate then rolled into a helix shape to achieve circular polarization without an impedance matching and that the proposed antenna can be used for potential applications in wideband wireless communication. A wideband bandwidth of 2.41 GHz with a resonant frequency at 5.8 GHz is achieved by the helical antenna on the Teflon substrate. The presented antenna on Teflon substrate has achieved a gain of 11.2 dB. The antenna design parameters and the simulated results are achieved using the commercial software CST. The proposed antenna can be used for various wireless applications such as Wideband, Ultra wideband, 5G and wireless Applications.

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Xie, Fei, Jian Hua Wang, and Yun Cheng Wang. "Finite Element Analysis of Impact of Root Fillet on Bending Stress for Helical Gear of Automotive Transmission." Applied Mechanics and Materials 184-185 (June 2012): 214–17. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.214.

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On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of bending stress were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software. Then the meshing on the geometric model and influence on gear strength with different radius of root fillet were discussed. The paper provided certain methods to guide the gear parametric design, strength analysis and improve optimization design efficiency of transmission gear parts.

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Yang, Xian Hong. "The Design and Finite Element Analysis for Crane Turntable Gear Based on Pro/E and ANSYS." Advanced Materials Research 710 (June 2013): 243–46. http://dx.doi.org/10.4028/www.scientific.net/amr.710.243.

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The use of Pro/E and their respective advantages ANSYS software product design and engineering analysis to solve the case, first of all in the Pro/E, the completion of three-dimensional helical gear design, and then in the Pro/MECHANICA completed finite element model of helical gear, and then into ANSYS for finite element analysis of bevel gear calculation and simulation, finite element analysis of the final results of optimization design model is presented recommendations for improvement. The product design and engineering analysis method has some reference value in engineering design.

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Escobar, R. F., C. M. Astorga-Zaragoza, J. A. Hernández, D. Juárez-Romero, and C. D. García-Beltrán. "Sensor fault compensation via software sensors: Application in a heat pump's helical evaporator." Chemical Engineering Research and Design 93 (January 2015): 473–82. http://dx.doi.org/10.1016/j.cherd.2014.06.017.

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Liu, Dan, Xiao Long Li, and Chun Xiu Wang. "The Gear Modification of Wind Gearboxes High-Speed Gears on Romax Software." Applied Mechanics and Materials 268-270 (December 2012): 1349–52. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1349.

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Abstract: Objective to acquire reasonable modification methods and values, and provide reference for gear modification of wind gearboxes. Methods the parallel level model of a MW wind gearbox is constructed which based on Romax software. To simulate the modification of high-speed gears under the method of profile modification, end relief, helical angle correction, lead crowing. Results According to the distribution of load on the tooth surface, acquired corresponding value. Conclusions Romax software greatly increase productivity, and it is a good platform for research on gear modification.

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Zeng, Qing Dun, and Feng Zhe Tan. "Finite Element Analysis of Gear Contact on Two-Speed Transmission in Electric Cars." Applied Mechanics and Materials 341-342 (July 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.443.

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The main content of gear design is the strength design, and the contact strength design of gears is the main heart of the strength design, because the stress and deformation of gears directly affect their safety and service life and concern whether vehicle transmissions work smoothly. Therefore it is necessary to perform a finite element analysis for the gear contact in transmission. Based on the contact characteristic of helical gears, a three-dimensional solid model was established by using the software Pro/E, and the contact stress analysis of gears was carried out by the software ANSYS Workbench. The stress and strain distribution contours of helical gears were obtained, and then the check of shtrength and rigidity was performed. Thus, it is convenient for designers both to test the strength of gears and to modify the size of gears.

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Balambica, V., T. J. Prabhu, R. Venkateshbabu, and Er Vishwa Deepak. "Design and Static Analysis of an Addendum Modified Helical Gear Tooth." Applied Mechanics and Materials 391 (September 2013): 132–38. http://dx.doi.org/10.4028/www.scientific.net/amm.391.132.

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A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. We have several types of gears among which spur gears are used as pinion and gear between parallel shafts.. When the involute portion of the tooth mates with the non-involute portion of the other tooth an undercut is formed. Due to this the mating gear will try to scoop out metal from the interfering portion. In order to avoid undercutting and interference, addendum modification of the gear tooth is carried out. This paper describes about the modeling meshing and the analysis techniques. Effort has been taken to develop the tooth profile involute as well as the fillet region by calculating the co-ordinates using C-language. The output file of the C-program is converted to modeling software PRO/E for 3-D modeling with the help of a coupler software DXF file converter. Those PRO/E models are imported to an analysis software ANSYS for the proposed stress analysis.

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Selig, J. M., and A. I. Ovseevitch. "Manipulating robots along helical trajectories." Robotica 14, no. 3 (1996): 261–67. http://dx.doi.org/10.1017/s0263574700019573.

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SUMMARYCurrent industrial robots are highly non-linear systems. However, the control strategies in most commercially available robots largely ignore the non-linearity. The resulting linear approximations are only valid at low speeds. Any improvement would allow robots to move faster and hence be more productive. There has been much academic research into robot control, but this has almost always separated the control and the trajectory planning. In this work we seek to combine these tasks and hence simplify the computations required. We investigate how to control a general robot in such a way that it's gripper follows straight line, circular or helical paths. These simple paths are both one parameter subgroups for the group of proper rigid motions and geodesies for certain metrics on the group. This suggests a non-linear feedback control law which turns the closed loop dynamics of the robot into the equations for geodesies. Although these equations are not completely stable we are able to modify the control law so that the resulting closed loop dynamics are stable. Hence, the end-effector of the robot will follow straight line, helical or circular trajectories.

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Pater, Zbigniew. "FEM Analysis of Helical Rolling of Steel Balls." Key Engineering Materials 572 (September 2013): 525–28. http://dx.doi.org/10.4028/www.scientific.net/kem.572.525.

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In this paper, two helical rolling processes for producing balls with a diameter of 40 mm are compared – the traditionalrolling and wedge rolls rolling. The process analyses were performed using Simufact.Forming, a FEM-based software program, and the same process parameters were applied in the analyses. Based on the calculations results (the distributions of effective strain, damage criterion, roll wear as well as the variations of forces and rolling moments during the processes), advantages and disadvantages of the considered rolling methods could be presented.

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Yan, Hua Jun, Jin Ping Liu, Zheng Huan Hu, Peng Biao Han, Hao En Mao, and Shi Bo Ma. "Effects of Die Tooth Profile on Forming Helical Tooth Shaft in Cross Wedge Rolling." Applied Mechanics and Materials 274 (January 2013): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.274.165.

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The study on forming helical tooth shaft processes in cross wedge rolling can contribute to the advantages of material-saving and efficient. Die tooth profile is an important process parameter of cross wedge rolling helical tooth shaft. Three kinds of forming process of die helical teeth were simulated by DEFORM-3D finite element analysis software to analyze three different die helical tooth. According to the tooth forming characteristics, the effects of three kinds of die tooth profile on forming of a polled piece were analyzed. When rolling a polled piece using the die with the same addendum width, it is convenient for die processing and the effect of polled piece forming is better; when using the die with the narrow front and gradually wider rear, the defects of uneven tooth bottom and larger pitch may happen. The rolling experiment was made by using the die with the same width at the tooth bottom. The results are in good agreement with the simulation. Therefore, we should use the die with unchanged addendum width, tooth height and the sidewall proportional increased when designing the die.

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Xu, Yong Chao, Ke Hua Zhang, Shuang Lu, and Zhi Qiang Liu. "Experimental Investigations into Abrasive Flow Machining of Helical Gear." Key Engineering Materials 546 (March 2013): 65–69. http://dx.doi.org/10.4028/www.scientific.net/kem.546.65.

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Abstract. Abrasive flow machining (AFM) is an effective method that uses the flow of a pressurized abrasive media for removing workpiece material. It is used to deburring, polishing or radiusing, etc. In this paper, the effect that AFM process on the surface of the helical gear is investigated. Then, the distribution of the velocities, shear rates and shear forces of the abrasive flow on the helical gear surface is obtained by CFD module of the COMSOL Multiphysics software. The simulation results show that the abrasive grains near the addendum, tooth surface and tooth root can be subjected to corresponding shear stress. Experimental results indicated that the surface roughness Ra of the left tooth surface, right tooth surface and addendum before processing 1.429um, 1.108um and 2.732um dropped after processing 0.228um, 0.216um and 1.754um. All burrs at the intersection between tooth surface and end surface has been cleared, the surface quality of the helical gear has been improved. Therefore, AFM method can improve the surface quality of the helical gear effectively.

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Su, Jian Xin, Xiao Zhong Deng, Xiao Zhong Ren, and Kai Xu. "Development of the Dressing Software for Form Grinding Wheel Used for Grinding Involute Helical Gears." Advanced Materials Research 97-101 (March 2010): 3556–59. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3556.

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On the basis of establishing the mathematical model of grinding wheel profile by means of analytic method, the grinding wheel profile was determined. Different factors affecting gear form grinding was analyzed by means of numerical simulation. The form grinding wheel dressing software for grinding helical gear was developed, and the instruction for dressing grinding wheel profile was generated. Wheel dressing results show that the dressing software is correct and feasible.

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Turbell, Henrik, and Per-Erik Danielsson. "Helical cone-beam tomography." International Journal of Imaging Systems and Technology 11, no. 1 (2000): 91–100. http://dx.doi.org/10.1002/(sici)1098-1098(2000)11:1<91::aid-ima10>3.0.co;2-f.

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Xie, Fei, Jian Hua Wang, and Yun Cheng Wang. "Finite Element Analysis of Flexural Strength for Helical Gear of Automotive Transmission." Advanced Materials Research 503-504 (April 2012): 723–26. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.723.

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On the basis of the analysis of special demand of helical gear of automotive transmission, gear precision modeling and finite element analysis of flexural strength were carried out in this paper. In UG three-dimensional modeling environment, helical gear model was generated and imported into ANSYS software through data exchange interface. Then meshed on the geometric model, discussed the tooth contact area and the detrimental loading position, and compared the influence on gear strength with different tooth root fillet radius. The paper provided certain methods to guide the gear parametric design, strength analysis and improving optimization design efficiency of transmission gear parts.

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Liu, Yanping, Yongqiang Zhao, Ming Liu, and Xiaoyu Sun. "Parameterized High-Precision Finite Element Modelling Method of 3D Helical Gears with Contact Zone Refinement." Shock and Vibration 2019 (July 7, 2019): 1–17. http://dx.doi.org/10.1155/2019/5809164.

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In order to perform a tooth contact analysis of helical gears with satisfactory accuracy and computational time consuming, a parameterized approach to establish a high-precision three-dimension (3D) finite element model (FEM) of involute helical gears is proposed. The enveloping theory and dentiform normal method are applied to deduce the mathematical representations of the root transit curve as well as the tooth profile of the external gear in the transverse plane based on the manufacturing process. A bottom-up modelling method is applied to build the FEM of the helical gear directly without the intervention of CAD software or creating the geometry model in advance. Local refinement methodology of the hexahedral element has been developed to improve the mesh quality and accuracy. A computer program is developed to establish 3D helical gear FEM with contact region well refined with any parameters and mesh density automatically. The comparison of tooth contact analysis between the coarse-mesh model and local refinement model demonstrates that the present method can efficiently improve the simulation accuracy while greatly reduce the computing cost. Using the proposed model, the tooth load sharing ratio, static transmission error, meshing stiffness, root bending stress, and contact stress of the helical gear are obtained based on the quasistatic load tooth contact analysis. This methodology can also be used to create other types of involute gears, such as high contact ratio gear, involute helical gears with crossed axes, or spiral bevel gears.

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Tomczak, J., Z. Pater, and J. Bartnicki. "Skrew Rolling of Balls in Multiple Helical Impressions." Archives of Metallurgy and Materials 58, no. 4 (2013): 1071–76. http://dx.doi.org/10.2478/amm-2013-0128.

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Abstract This paper presents results of theoretical and experimental research on skew rolling process of balls with diameter ;30 mm in multiple helical tools. Numerical analysis of the process was conducted basing on finite element method (FEM), using the commercial software Simufact Forming in version 10.0. Simulations were made in the three-dimensional state of strain with consideration of complex thermal analysis, due to which progression of the products shape was determined. Distributions of strains and temperatures as well as the process force parameters were also determined. The results of numerical calculations were experimentally verified in laboratory conditions. The obtained results confirmed the possibility of semi-finished products of balls type manufacturing by means of rolling in multiple helical impressions.

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Skjoedt, M., M. H. Hancock, and N. Bay. "Creating Helical Tool Paths for Single Point Incremental Forming." Key Engineering Materials 344 (July 2007): 583–90. http://dx.doi.org/10.4028/www.scientific.net/kem.344.583.

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Single point incremental forming (SPIF) is a relatively new sheet forming process. A sheet is clamped in a rig and formed incrementally using a rotating single point tool in the form of a rod with a spherical end. The process is often performed on a CNC milling machine and the tool movement is programed using CAM software intended for surface milling. Often the function called profile milling or contour milling is applied. Using this milling function the tool only has a continuous feed rate in two directions X and Y, which is the plane of the undeformed sheet. The feed in the vertical Z direction is done in the same angular position in the XY plane along a line down the side of the work piece. This causes a scarring of the side and also results in a peak in the axial force when the tool is moved down. The present paper offers a solution to this problem. A dedicated program uses the coordinates from the profile milling code and converts them into a helical tool path with continuous feed in all three directions. Using the helical tool path the scarring is removed, the part is otherwise unchanged and a major disadvantage of using milling software for SPIF is removed. The solution is demonstrated by SPIF of three different geometries: a pyramid, a cone and a complex part.

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