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Journal articles on the topic 'Taper coefficient'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Уласовец and Vadim Ulasovets. "Influence of ways of saw logs cutting on the taper coefficient of unedged timber." Forestry Engineering Journal 4, no. 1 (2014): 142–46. http://dx.doi.org/10.12737/3358.

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One of the characteristic parameters of the unedged boards is their taper coefficient. It was found that when sawing logs in parallel to their longitudinal axis taper coefficient of central and lateral unedged boards is always higher than in the original log and it increases with distance of the board from the center of the vertex end of the log and increase of its taper coefficient, while in parallel generatrix cutting (by taper) taper coefficient of central and lateral unedged boards is always less than the initial log has and it decreases with distance of the board from the center of apex e

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2

Hook, K., J. Cheer, and A. Karlos. "An experimental investigation into a dual taper acoustic black hole termination." JASA Express Letters 2, no. 9 (2022): 095601. http://dx.doi.org/10.1121/10.0013899.

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Acoustic black holes (ABHs) can provide effective damping of the reflected wave component when used to terminate a beam. The behaviour of an ABH is characterised by its local modes, which produce narrow frequency bands of high absorption. To enhance the performance of ABH terminations, a multi-taper ABH has previously been proposed and analytical results demonstrate that the use of two or more tapers produces a compound effect on the reflection coefficient, resulting in more bands of low reflection. This paper extends this work and presents an experimental realisation of a multi-taper ABH conf

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3

Adiwidodo, Satworo, and Andy Hermawan Wijaya. "Simulation of Effect of Airfoil MH32 with Variation Taper Ratio and Angle of Attack Coefficient Lift and Drag Fixed wing Unmanned Aircraft." Asian Journal Science and Engineering 1, no. 1 (2022): 23. http://dx.doi.org/10.51278/ajse.v1i1.396.

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Nowadays, the aerospace sector is growing very rapidly. One of the newest technologies is unmanned aerial vehicle. This UAV has functions to monitor disaster, mapping, espionage and shooting target. Therefore it needs a plane that can fly fast and agile. To achieve these characteristics, one of the most important things is the design of the wings. Some of the important parameters contained in the wings are the type of airfoil, aspect ratio, wing area, taper ratio, and angle of attack. The article aims to analyze the type of airfoil MH32 as well as the effect of the parameter taper ratio with v

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4

Esa, Mazlina, Nik Noordini Nik Abd. Malik, Mohd Khairul Hisham Ismail, and Shipun Anuar Hamzah. "Performance Investigation of Microstrip Klopfenstein Tapered Line Impedance Transformer Using MathCAD Software for Communication System." Applied Mechanics and Materials 781 (August 2015): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amm.781.57.

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Impedance transformer is highly desirable in systems such as microwave communication systems for compensating impedance mismatches. Such device that can perform over broadband frequencies find numerous applications. This article presents the design and investigation of a microstrip Klopfenstein tapered line impedance transformer, KTLI. In ideal condition, it must possess minimum passband reflection coefficient for a given taper length. For specific reflection coefficient, there is a minimum value of taper length. The investigation is based on analytical equations which were computed using Math

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5

Madi, Madi, Tuswan Tuswan, Ilham Dwi Arirohman, and Abdi Ismail. "Comparative Analysis of Taper and Taperless Blade Design for Ocean Wind Turbines in Ciheras Coastline, West Java." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 18, no. 1 (2020): 8–17. http://dx.doi.org/10.14710/kapal.v18i1.32486.

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The blade is the most critical part of turbine design because it is used to convert kinetic to mechanical energy. In general, the blade types used for ocean wind turbines are taper and taperless blades, like those operated at Ciheras Coastline. Previous research has been analyzed the type of airfoil used in designing taper blades for ocean wind turbines using NACA 4412, which was selected as the optimal foil configuration at sea wind speeds of 12 m/s. In this study, the comparison of taper and taperless blade designs using NACA 4412 at a wind speed of 12 m/s is analyzed. The comparative study

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6

Xiao, Wei Wei, Ming Zhu, Kuan Min Mao, and Sheng Lei. "Dynamic Model of Spindle-Holder Taper Joint of BT40 Holder." Applied Mechanics and Materials 551 (May 2014): 158–63. http://dx.doi.org/10.4028/www.scientific.net/amm.551.158.

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The dynamic characteristics of spindle-holder taper joint greatly influencethe performance of machine tools. This paper proposed a 24-DOFs spring-damper model to deal with the dynamic model of spindle-holder taper joint. To identify the stiffness of springs and damping coefficient of damper, a parameter identification method was developed based on the inverse relationship of dynamic matrix and frequency response function matrix. Using modal test and the proposed dynamic model, the taper joint of BT40 holder was studied. At the end of this paper, a case was presented to validate the dynamic mod

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7

Inoue, Akio, Motohiro Sato, and Hiroyuki Shima. "A new taper index based on form-factor: application to three bamboo species (Phyllostachys spp.)." European Journal of Forest Research 140, no. 6 (2021): 1533–42. http://dx.doi.org/10.1007/s10342-021-01416-6.

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AbstractThe form-factor for the stem surface area is directly proportional to the square root of the form-factor for the stem volume, i.e., the square root law of the form-factor. Although the square root law addresses the stems of coniferous trees, the nature of the proportional coefficient of the law has not been discussed. In this study, we demonstrated that the coefficient indicates the stem taper; therefore, it is named “Taper Index based on Form-Factor (TIFF).” We also examined the relationship between the form-factor for the culm surface area and the form-factor for the apparent culm vo

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8

Ali, Muhammad Mustafa Muhammad, and Ammar Jasim Mohammed Al-Yousif. "Developed of Taper Equation and Volume for Eucalyptus camaldulensis Dem. in the Nineveh Region." IOP Conference Series: Earth and Environmental Science 1259, no. 1 (2023): 012052. http://dx.doi.org/10.1088/1755-1315/1259/1/012052.

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Abstract This study aimed to estimate a taper equation for eucalyptus trees growing in Nineveh Governorate, it is used in forest inventory or management planning systems, giving information about the diameter at any point along the main stem of the tree. Data were collected from three naturally growing trees for diameter at breast height, total height, and diameter at different levels, starting from 0.5 m above ground level, with distances of half a meter along the main stem, using computer and regression methods. different. Linear and non-linear. In the preparation of the taper equation, as w

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9

Navar, J. de J., and P. A. Dominguez. "Fitting volume and taper functions to four pine species planted in Northeastern Mexico." Forest Systems 6, no. 1 (1997): 147–61. http://dx.doi.org/10.5424/581.

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The objective of this study was to observe the goodness of fit of eight volume models and four taper functions to four pine species (Pinus brutia Ten., Pinus eldarica Medw., Pinus halepensis Mill., and Pinus estevezii Mart.) planted in northeastern Mexico. Trees were measured in diameter at several sections of the stem. The 90 p. 100 of the total available information (145, 39, 227 and 48 trees for volume and 2,350, 1,280, 4,407 and 1,320 for taper) were used to fit four taper functions (Clutter, Amidón, Kozak, Newnham) and eight volume equations by least square techniques in linear and non-li

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10

Tran, Ngoc Khanh, Van Khang Nguyen, Phu Khanh Nguyen, Thi Kim Dung Hoang, and Van Quang Dao. "Effect of Shapes and Turbulent Inlet Flow to Vortices on Delta Wings." Applied Mechanics and Materials 889 (March 2019): 434–39. http://dx.doi.org/10.4028/www.scientific.net/amm.889.434.

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This paper aims to estimate the effect of turbulent inlet flow to vortices on Delta wing with four different turbulence intensity from 0.5% to 15% and the effect of taper ratios to aerodynamic characteristics of Delta wings with four taper ratios: 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7. The main purpose of this paper is to find out the formation, development, and breakdown of vortices on Delta wings when changing taper ratios and turbulence intensity thence determining the center of vortices with the range of attack angles from 5o to 40o in low velocities about 2.5 m/s. This research uses Delta

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11

Sun, Dan, Sheng-Yuan Li, Huan Zhao, and Cheng-Wei Fei. "Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals." Materials 12, no. 14 (2019): 2324. http://dx.doi.org/10.3390/ma12142324.

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To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance,

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12

Wang, Shifeng, Kaixuan Zheng, and Deming Nie. "Numerical study on the flow past a finite-length tapered cylinder." Thermal Science 26, Spec. issue 1 (2022): 131–38. http://dx.doi.org/10.2298/tsci22s1131w.

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In this study, the flow past a finite-length tapered cylinder is numerically investigated via the finite-volume method with Reynolds numbers ranging from 50-250 and taper ratio l = 1.5. The corresponding lift and drag coefficients, as well as the Strouhal numbers are presented. The factors related to the discontinuity, through Reynolds numbers of 100 - 200, in the lift coefficient, which is related to the wake structure of the tapered cylinder, are explained. Furthermore, the influence of the wake structure on the discontinuity in the lift coefficient is discussed. Finally, a comparison of the

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13

Zhou, Haimiao, Ya-Pei Peng, and Nan-Kuang Chen. "High Sensitivity Fiber Interferometric Strain Sensors Based on Elongated Fiber Abrupt Tapers." Micromachines 13, no. 7 (2022): 1015. http://dx.doi.org/10.3390/mi13071015.

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We demonstrate high-sensitivity fiber strain sensors based on an elongated abrupt taper. The fiber abrupt taper, with a tapered diameter ranging from 40–60 μm, was made by using a hydrogen microflame to break the waveguide adiabaticity so as to convert the fundamental mode into cladding modes. The abrupt taper was further uniformly tapered by using a normal moving flame with a torch diameter of 7 mm to elongate the tapered region until the tapered diameter was down to 2.5–5 μm. The excited high-order modes were confined to propagate along the cladding and then recombined at the rear edge of th

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14

Jia, Liqiang, Bo Wang, and T. Tafsirojjaman. "Experimental Research on Bonded Anchorage of Carbon Fiber Reinforced Polymer Prestressed Strands." Polymers 14, no. 19 (2022): 4015. http://dx.doi.org/10.3390/polym14194015.

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Aiming at the problems of a large number of corrosion and fatigue damage of the current prestressed steel strands, this paper adopts carbon fiber-reinforced composite (CFRP) strand with better corrosion resistance and fatigue resistance and uses it in concrete structures. The bond anchorage is usually used to anchor CFRP tension members, which bonds the CFRP through the binding medium. Through experimental research on the CFRP strand bond anchorage, the inner taper of the CFRP prestressed strand cone was anchored and the influence of different anchor lengths and bonding media on the anchorage

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15

Téo, Saulo Jorge, Sebastião Do Amaral Machado, Afonso Figueiredo Filho, and Margarida Tomé. "STEM TAPER EQUATION WITH EXTENSIVE APPLICABILITY TO SEVERAL AGE CLASSES OF Pinus taeda L." FLORESTA 48, no. 4 (2018): 471. http://dx.doi.org/10.5380/rf.v48i4.50996.

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The aim of this study was to develop stem taper equations for trees of Pinus taeda L. inside and outside bark with extensive applicability to several age classes. Data were obtained from 631 trees of P. taeda, ranging from 4 to 31 years of age, in different stands distributed in several counties of the Midwest region of the state of Santa Catarina, Brazil. The taper models of Biging (1984), Schöpfer (1966), and Kozak et al. (1969) were tested. These models were fitted in their simplest formulation as well as by varying their coefficient linear functions of stand age with the procedure PROC NLI

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16

Rieker, Claude B., and Peter Wahl. "What the Surgeon Can Do to Reduce the Risk of Trunnionosis in Hip Arthroplasty: Recommendations from the Literature." Materials 13, no. 8 (2020): 1950. http://dx.doi.org/10.3390/ma13081950.

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Trunnionosis, defined as wear and corrosion at the head–neck taper connection, is a cause of failure in hip arthroplasty. Trunnionosis is linked to a synergistic combination of factors related to the prosthesis, the patient, and the surgeon. This review presents analytical models that allow for the quantification of the impact of these factors, with the aim of providing practical recommendations to help surgeons minimize the occurrence of this failure mode. A tighter fit reduces micromotion and, consequently, fretting of the taper connection. The paramount parameters controlling the fixation f

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17

Scholl, Laura, David Pierre, Raga Rajaravivarma, et al. "Effect of the support systems’ compliance on total hip modular taper seating stability." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 232, no. 9 (2018): 862–70. http://dx.doi.org/10.1177/0954411918790282.

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Assembly of a femoral head onto the stem remains non-standardized. The literature shows altering mechanical conditions during seating affects taper strength and lower assembly load may increase fretting corrosion during cyclic tests. This suggests overall performance may be affected by head assembly method. The purpose of this test was to perform bench-top studies to determine influence of peak force magnitude, load rate, and compliance of the system's support structure on initial stability of the taper. Custom manufactured CoCrMo femoral heads and Ti-6Al-4V taper analog samples were assembled

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18

Fessler, H., and D. C. Fricker†. "Friction in Femoral Prosthesis and Photoelastic Model Cone Taper Joints." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 203, no. 1 (1989): 1–14. http://dx.doi.org/10.1243/pime_proc_1989_203_003_01.

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Static axial push-on and lift-off, and push-on and twist-off experiments were designed and performed to measure the effective, room-temperature coefficient of friction μ for different design femoral prosthesis cone taper joints comprising a universal head on a stem spigot. Alumina and metal heads were tested on metal spigots using either distilled water, Ringer's solution, blood or no lubricant. Complementary push-on and lift-off friction tests of Araldite model joints for subsequent frozen-stress, photoelastic stress analysis were performed at 130°C. It was found that lubricant caused little

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19

Thérien, Guillaime, and Claude Camiré. "Use of Taper Curve Solved by an Algebraic Method in Silvicultural Research." Forestry Chronicle 62, no. 6 (1986): 529–32. http://dx.doi.org/10.5558/tfc62529-6.

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Taper equations are commonly used to predict the bole shape and to calculate its volume. In this study, a new algebraic solution model is proposed for research purposes. This model was found to be as accurate as cubic spline function and simple to use. It would be particularly appropriate for research on stand reactions after silvicultural treatments. The study also evaluated compatible volume equations. The required accuracy can be obtained only with a volume equation taking into account a form class coefficient. Key words: balsam fir, taper equation, volume equation, algebraic solution model

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20

Tahani, M., M. Masdari, and M. Kazemi. "Aerodynamic performance improvement of a canard control missile." Aircraft Engineering and Aerospace Technology 89, no. 6 (2017): 871–78. http://dx.doi.org/10.1108/aeat-01-2016-0019.

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Purpose This paper aims to analyze the influence of the changings in geometrical parameters on the aerodynamic performance of the control canard projectiles. Design/methodology/approach Because of the mentioned point, the range of projectiles increment has a considerable importance, and the design algorithm of a control canard projectile was first written. Then, were studied the effects of canard geometric parameters such as aspect ratio, taper ratio and deflectable nose on lift to drag coefficient ratio, static margin based on the slender body theory and cross section flow. Findings The code

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21

Ko, Chiung, Jintaek Kang, Chaejun Lim, Donggeun Kim, and Minwoo Lee. "Application of Machine Learning Models in the Estimation of Quercus mongolica Stem Profiles." Forests 16, no. 7 (2025): 1138. https://doi.org/10.3390/f16071138.

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Accurate estimation of stem profiles is critical for forest management, timber yield prediction, and ecological modeling. However, traditional taper equations often fail to capture species-specific growth variability and exhibit significant biases, particularly in the upper stem regions. Machine learning regression models were applied to estimate Quercus mongolica stem profiles across South Korea, and performance was compared with that of a traditional taper equation. A total of 2503 sample trees were used to train and validate Random Forest (RF), XGBoost (XGB), Artificial Neural Network (ANN)

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Tahani, Mojtaba, Mehran Masdari, and Ali Bargestan. "Aerodynamic performance improvement of WIG aircraft." Aircraft Engineering and Aerospace Technology 89, no. 1 (2017): 120–32. http://dx.doi.org/10.1108/aeat-05-2015-0139.

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Purpose This paper aims to investigate the aerodynamic characteristics as well as static stability of wing-in-ground effect aircraft. The effect of geometrical characteristics, namely, twist angle, dihedral angle, sweep angle and taper ratio are examined. Design/methodology/approach A three-dimensional computational fluid dynamic code is developed to investigate the aerodynamic characteristics of the effect. The turbulent model is utilized for characterization of flow over wing surface. Findings The numerical results show that the maximum change of the drag coefficient depends on the angle of

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23

Reed, David D., and John C. Byrne. "A Simple, Variable Form Volume Estimation System." Forestry Chronicle 61, no. 2 (1985): 87–90. http://dx.doi.org/10.5558/tfc61087-2.

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A volume estimation system giving the stem profile (upper stem diameter outside bark), total tree volume, and merchantable volume to a height or diameter limit is developed based on a simple, variable form stem taper curve. The stem taper curve is defined by coefficient values indicating conic and parabolic tree forms. For a given height, small diameter trees are assigned parabolic forms and large diameter trees are assigned conic forms. A tree's position in the tree form continuum is defined by its total height to diameter at breast height ratio. Performance of the volume estimation system is

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24

Geng, Longlong, Xiaozhong Deng, Hua Zhang, Shaowu Nie, and Chuang Jiang. "Theory and experimental research on spiral bevel gear by double-side milling method." Mechanics & Industry 22 (2021): 33. http://dx.doi.org/10.1051/meca/2021032.

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In this paper, a double-side milling method on spiral bevel gear is proposed. First, according to the tooth taper processed by double-side milling method, the influence of dedendum angle on the tooth taper was researched. Taking cut parameters into comprehensive consideration, the geometric parameters were designed through the inclination of root line and modified mean point in which machine setting parameters calculated was selected. Only the modified mean point met the meshing equation, and the error of pressure angle would increase as far away from the modified mean point in tooth line. The

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25

Pratama, Raditya Elfa, and Bobie Suhendra. "Analisis performa bilah taper dengan airfoil GOE 796 pada turbin angin sumbu horizontal TSD-500 di PT Lentera Bumi Nusantara." Jurnal Teknik Mesin Indonesia 17, no. 2 (2022): 7–11. http://dx.doi.org/10.36289/jtmi.v17i2.291.

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Kebutuhan listrik Indonesia dari tahun ke tahun semakin meningkat, namun ketersediaan bahan bakar fosil seperti minyak bumi dan batubara semakin berkurang, sehingga diperlukan sumber energi baru terbarukan (EBT) sebagai solusi untuk mengatasi permasalahan. Salah satu sumber energi terbarukan yang dapat dimanfaatkan dan memiliki potensi besar adalah energi angin. Tujuan dari kajian ini adalah untuk menentukan bilah tipe taper dengan airfoil yang optimal untuk turbin angin sumbu horizontal skala mikro. Dalam kajian ini, bilah turbin angin sumbu horizontal dengan airfoil GOE 796 diuji menggunakan

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26

Kitagawa, Tsuyoshi, Yasuhiro Tanimoto, Takashi Iida, and Hiroshi Murakami. "Effects of material and coefficient of friction on taper joint dental implants." Journal of Prosthodontic Research 64, no. 4 (2020): 359–67. http://dx.doi.org/10.1016/j.jpor.2019.10.003.

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27

Yulianti, Ian, Ngurah Made Darma Putra, Fianti Fianti, et al. "Characterization of Temperature Response of Asymmetric Tapered-Plastic Optical Fiber-Mach Zehnder Interferometer." Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 10, no. 1 (2020): 34. http://dx.doi.org/10.26740/jpfa.v10n1.p34-43.

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Temperature measurement is important in various applications; therefore, various temperature sensors have been developed. Due to its advantages, many optical fiber-based temperature sensors have been proposed. The wavelength modulation-based optical sensor is interesting due to high accuracy. However, the complex fabrication process and high cost limit the advantages of the sensors. Therefore, we proposed a simple and low-cost Mach Zehnder interferometer (MZI) sensor using step-index plastic optical fiber (SI-POF). Performance characterization of the sensor to temperature variation is presente

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28

Abo Elazm, Mohamed, Ahmed Ragheb, Ahmed Elsafty, and Mohamed Teamah. "Computational analysis for the effect of the taper angle and helical pitch on the heat transfer characteristics of the helical cone coils." Archive of Mechanical Engineering 59, no. 3 (2012): 361–75. http://dx.doi.org/10.2478/v10180-012-0019-9.

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This numerical research is devoted to introducing the concept of helical cone coils and comparing the performance of helical cone coils as heat exchangers to the ordinary helical coils. Helical and spiral coils are known to have better heat and mass transfer than straight tubes, which is attributed to the generation of a vortex at the helical coil. This vortex, known as the Dean Vortex, is a secondary flow superimposed on the primary flow. The Dean number, which is a dimensionless number used in describing the Dean Vortex, is a function of Reynolds Number and the square root of the curvature r

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Lanin, V. L., V. T. Pham, and A. I. Lappo. "Through-silicon-via formation of 3D electronic modules by laser radiation." Doklady BGUIR 19, no. 3 (2021): 58–65. http://dx.doi.org/10.35596/1729-7648-2021-19-3-58-65.

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Laser heating is a promising method for through-silicon-via (TSV) formation in assembling highdensity 3D electronic modules due to its high specific energy and local heating ability. Using laser radiation for the formation of TSV makes it possible to reduce its diameter, indirectly increases the density of elements in 3D electrical modules. Laser system selection depends on the physical and mechanical properties of the processed materials and on the technical requirements for laserprocessing. The reflectivity of most materials increases with the laser wavelength. It was found that with an incr

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H. Elaikh, Talib. "Dynamic Analysis of non-Prismatic Beam under non-Concentric Axial Force by using The Differential Transformation Method." University of Thi-Qar Journal for Engineering Sciences 4, no. 2 (2013): 79–95. http://dx.doi.org/10.31663/utjes.v4i2.205.

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n this study, the dynamic analysis of non-prismatic simply-supported Euler-Bernoulli beam subjected to non-concentric compressive axial force has been presented. Kinetic and potential energy expressions of the model are derived. Hamilton‘s principle is used to obtain the governing equations of motion. The fourth order differential equation with variable coefficient of the beam dynamics and buckling is solved using Differential Transform Method (DTM) to obtain mode shape, natural frequencies and buckling load of the system. The computer package Mathematical is used to write a program to calcula

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Hirata, Masayuki, Kenichi Oe, Ayumi Kaneuji, Ryusuke Uozu, Kazuhiro Shintani, and Takanori Saito. "Relationship between the Surface Roughness of Material and Bone Cement: An Increased “Polished” Stem May Result in the Excessive Taper-Slip." Materials 14, no. 13 (2021): 3702. http://dx.doi.org/10.3390/ma14133702.

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Although some reports suggest that taper-slip cemented stems may be associated with a higher periprosthetic femoral fractures rate than composite-beam cemented stems, few studies have focused on the biomaterial effect of the polished material on the stem–cement interface. The purpose of this study was to investigate the relationship between surface roughness of materials and bone cement. Four types of metal discs—cobalt-chromium-molybdenum alloy (CoCr), stainless steel alloy 316 (SUS), and two titanium alloys (Ti-6Al-4V and Ti-15Mo-5Zr-3Al)—were prepared. Five discs of each material were produ

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32

Aldahhan, Hussein, and Bashar Qas Elias. "Study and analysis of discontinuity by using taper baluns." International Journal of Engineering & Technology 4, no. 2 (2015): 283. http://dx.doi.org/10.14419/ijet.v4i2.4396.

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A coplanar stripline (CPS) to microstrip line transition (MSL) are designed with high characteristics, such as wide band, low return loss and high insertion loss. Two types of tapers are proposed, exponential and triangular to decreases of discontinuity in the power flow in transmission line. The suggested design achieved reflection coefficient under -10 dB over wide band from 1 GHz to 3 GHz and insertion losses of less than 1 dB.

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33

Rohmawati, Iis, Hiroshi Arai, Hidemi Mutsuda, Takuji Nakashima, and Rizal Mahmud. "Optimizing Effect of Wavy Leading Edge (WLE) in Rectangular Wing and Taper Wing." Journal of Mechanical Engineering, Science, and Innovation 1, no. 2 (2021): 56–68. http://dx.doi.org/10.31284/j.jmesi.2021.v1i2.2296.

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Experimental and numerical research have been performed to investigate the Wavy Leading Edge (WLE) effect on the rectangular wing. The WLE is inspired by humpback whale flipper morphology which is blunt and rounded in certain form pattern. This flipper shape plays an important role for its behaviour specially capturing their prey. This advantage could be applied to other systems such as fin stabilizers or wind turbines. Steady cases in various aspect ratios were conducted to find out the optimum effect of WLE with baseline NACA 0018 profile at Reynolds number 1.4 x 105. The chord length of the

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34

Dragoni, E., and A. O. Andrisano. "Structural Evaluation of Ceramic Femoral Heads: Effect of Taper Friction, Support Conditions and Trunnion Compliance." Journal of Biomechanical Engineering 117, no. 3 (1995): 293–99. http://dx.doi.org/10.1115/1.2794184.

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The outcome of a nonlinear finite element stress analysis of ceramic heads for artificial hip joints is presented. The analysis mainly covers the influence of taper friction, support conditions and trunnion modulus of elasticity on the hoop stress distribution at the surface of the head bore. The paper quantifies how much the maximum tensile stress decreases with increasing frictional coefficient, with stiffening of the support and with stiffening of the trunnion material. An appreciable rise of the maximum tensile upon unloading of the head is also shown for the case of cup support. The compu

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35

Duden, A., and L. Fottner. "Influence of taper, Reynolds number and Mach number on the secondary flow field of a highly loaded turbine cascade." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 211, no. 4 (1997): 309–20. http://dx.doi.org/10.1177/095765099721100401.

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The meridional divergence of low-pressure turbines has a strong influence on their secondary flow field. This paper describes experimental and numerical investigations on two highly loaded linear turbine cascades with the same blade profile and stacking but with parallel end walls and divergently tapered end walls respectively. The effects of taper, Reynolds number (1.2 × 105, 5 × 105) and Mach number (0.30, 0.59, 0.80) are discussed. Data were obtained using pneumatic probes, pressure tappings and surface flow visualizations. Calculations were performed with the three-dimensional Navier—Stoke

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Tadese, Addisu Kidanemariam. "A work done approach on analyzing the effects of densification parameters on tapered screw extruders." Advances in Mechanical Engineering 14, no. 6 (2022): 168781322211027. http://dx.doi.org/10.1177/16878132221102764.

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Densification is the process of compacting bulk material to increase its physical and energy density. One way of densification is by using screw extruders. Yet, sufficient theoretical studies have not been carried out on the densification parameters for a tapered screw. In this study, a mathematical model for investigating the effect of the operational parameters on a tapered screw has been studied by analyzing the work balance on the plug along the tapered screw channel. By using the taper angle, screw pitch, and barrel friction coefficients as control variables, a mathematical model for the

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Kundu, B., and P. K. Das. "Performance analysis and optimization of straight taper fins with variable heat transfer coefficient." International Journal of Heat and Mass Transfer 45, no. 24 (2002): 4739–51. http://dx.doi.org/10.1016/s0017-9310(02)00189-8.

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Wang, Xiao, Xiao Bo Fan, and Hui Xia Liu. "Research on Cold Taper-Rolling Law of the Spiral Blade Based on Finite Element Method." Materials Science Forum 575-578 (April 2008): 305–10. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.305.

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The taper-rolling model, the elastic-plastic constitutive equations with limited deformation conditions, and FEM model for the cold rolling process of spiral blade are established. The FEM software SUPERFORM based on elastic-plastic theory is adopted to simulate the spiral blade forming process for the first time. The influence of different parameters (feeding height H, adjusting parameter of the working pressure 1 S , translation slip S2 , elastic angle θ , workpiece material and friction coefficient) on the shape of spiral blade are simulated and analyzed systematically. And the law of the f

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ZHANG, JING, YUNDONG ZHANG, XUENAN ZHANG, et al. "SLOW LIGHT IN A TWO MICROSPHERE OPTICAL FIBER SYSTEM." Journal of Nonlinear Optical Physics & Materials 18, no. 04 (2009): 591–97. http://dx.doi.org/10.1142/s0218863509004920.

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The condition of being undercoupled and overcoupled for the lower microsphere is investigated respectively in two microspheres coupled with a fiber taper system. The effective phase shift curves which could occur in normal dispersion to generate slow light are different based on both situations. The influence of the loss coefficient and coupler parameter for each microsphere is interpreted in detail.

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Sandi, Efri, Aodah Diamah, Pitoyo Yuliatmojo, and Baso Maruddani. "A Proposed Design Method for Sparse Array Antenna by Using the Spacing Coefficient Algorithm." Applied Computational Intelligence and Soft Computing 2022 (September 14, 2022): 1–6. http://dx.doi.org/10.1155/2022/4050068.

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One of the major challenges in developing various practical communication systems is reducing device complexity and development costs. In this study, a linear sparse array antenna design problem is addressed and a new approach for density taper element spacing by using the spacing coefficient algorithm is proposed. This method is a mathematical approach to obtain the distance between array elements by developing a spacing coefficient d n for each element to achieve radiation performances with a minimum number of antenna elements. The simulation and measurement results show a significant improv

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Bozkaya, Dinc¸er, and Sinan Mu¨ftu¨. "Efficiency Considerations for the Purely Tapered Interference Fit (TIF) Abutments Used in Dental Implants." Journal of Biomechanical Engineering 126, no. 4 (2004): 393–401. http://dx.doi.org/10.1115/1.1784473.

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A tapered interference fit provides a mechanically reliable retention mechanism for the implant-abutment interface in a dental implant. Understanding the mechanical properties of the tapered interface with or without a screw at the bottom has been the subject of a considerable amount of studies involving experiments and finite element (FE) analysis. In this paper, approximate closed-form formulas are developed to analyze the mechanics of a tapered interference fit. In particular, the insertion force, the efficiency, defined as the ratio of the pull-out force to insertion force, and the critica

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Lin, Shun Hong, Chang Jiang Li, Jian Ping Ding, and Dai Chuan Chen. "Numerical Simulation and Analysis of Tapered Interference Fit of Atomizer Disk." Applied Mechanics and Materials 201-202 (October 2012): 170–74. http://dx.doi.org/10.4028/www.scientific.net/amm.201-202.170.

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The contact analysis model of high speed centrifugal atomizer is created and stress distribution law is obtained by using ANSYS FEM software in this paper. The stress distribution along the axial direction is uneven, the stress of the small end of the taper is large and the stress concentration appears on both ends of the taper. In addition, the factors which influence the interference fit stress are researched and discussed. The interference fit stress is mainly influenced by the shrink range, while the influence from the friction coefficient is very weak. Comparing with the conventional desi

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Petrover, Kayla. "Sonic black hole duct." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A70. http://dx.doi.org/10.1121/10.0018196.

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The sonic black hole is a type of acoustic black hole that attenuates sound propagation via the acoustic black hole effect. This phenomenon is when an incident acoustic wave propagates through a power-law tapering geometry causing the wavelength to compress, the wave speed to decrease, and the time for the wave packet to reach the exit to extend infinitely. As a result, the wave never reaches the exit, so it cannot be reflected or transmitted. However, this outcome relies on the taper approaching exactly zero, which is impossible to manufacture. Therefore, the taper must be truncated leading t

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Wang, Heyuan, Chengwei Tong, Chuantan Ruan, Chuan Ding, Sheng Li, and Jian Ruan. "Optimization of Mechanical Efficiency Models for 2D Piston Pumps with a Stacked Taper Roller Set." Machines 10, no. 3 (2022): 180. http://dx.doi.org/10.3390/machines10030180.

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Since the clearance between the guide rail and the roller reduces the efficiency of the 2D pump, this paper proposes a novel 2D piston pump with stacked taper roller sets to eliminate the effect of the clearance. The structure of the 2D pump is introduced, and the mathematical model of the torque and the mechanical efficiency of the bilateral force on the guide rail are established and analyzed. The model takes into account the change in the oil viscosity, the spatial angle and the oil churning loss. A test rig was built to test the mechanical efficiency under different operating conditions. T

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Naggar, M. Hesham El, and Mohammed Sakr. "Evaluation of axial performance of tapered piles from centrifuge tests." Canadian Geotechnical Journal 37, no. 6 (2000): 1295–308. http://dx.doi.org/10.1139/t00-049.

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The performance of tapered piles under axial compressive loading was investigated using centrifuge model tests. Model tapered and cylindrical piles were installed in cohesionless soil and subjected to axial loading. The objectives of this study were to understand the performance characteristics of tapered piles and develop a rational approach for their design. The results of axial compressive loading tests on 12 one-tenth scale model piles with different taper angles in a centrifuge setup are presented and discussed. Six piles were instrumented and six piles were not. The load distribution alo

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Khan, M. Kamran, M. Hesham El Naggar, and Mohamed Elkasabgy. "Compression testing and analysis of drilled concrete tapered piles in cohesive-frictional soil." Canadian Geotechnical Journal 45, no. 3 (2008): 377–92. http://dx.doi.org/10.1139/t07-107.

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When pile driving is difficult and (or) economically not viable, cast-in-place piles are indispensable. Tapered piles, which have top cross-sections larger than the bottom cross-sections, have the potential for substantial advantages over conventional straight-sided piles. This paper investigates the construction and performance of innovative drilled concrete tapered piles. A full-scale pile load-testing program was conducted to evaluate the axial compressive capacity of drilled concrete tapered piles in frictional soil. One straight and three tapered augers were designed and manufactured to p

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Meng, Siwei, Guangfeng Shi, and Hongbing Lv. "Study of deformation behavior of plastic metal materials during laser-assisted micro-imprinting formings." Physica Scripta 99, no. 3 (2024): 035018. http://dx.doi.org/10.1088/1402-4896/ad265a.

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Abstract When a large taper angle diamond taper indenter is used for micro-imprinting plastic metals, the stagnation zone is caused by excessive extrusion and friction within the material at the tip of the indenter, which in turn affects the flow characteristics of the material and the quality of the processed surface. In this study, the formation of laser-assisted diamond indenter micro-imprinting stagnation zone mechanism was proposed. The deformation behavior when processing plastic-metal materials using this technique is revealed by numerical simulation. And observed this phenomenon throug

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Shimov, Georgy V., V. V. Shimov, and Artem Zavalin. "A Study of the Influence of the Manufacturing Process Parameters on the Distribution of Residual Stresses in Pipe Walls during Sink Drawing." Solid State Phenomena 284 (October 2018): 542–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.542.

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The paper presents the results of the study of residual stresses in stainless cold-drawn pipes obtained during FEM simulation of the process of sink drawing. The relation of the value of reduction, the taper angle of the working area of the drawing zone, the drawing speed and the friction coefficient to the pattern of distribution and the value of residual stresses in the pipe walls was established.

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Naemi, Roozbeh, Stelios G. Psycharakis, Carla McCabe, Chris Connaboy, and Ross H. Sanders. "Relationships Between Glide Efficiency and Swimmers’ Size and Shape Characteristics." Journal of Applied Biomechanics 28, no. 4 (2012): 400–411. http://dx.doi.org/10.1123/jab.28.4.400.

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Glide efficiency, the ability of a body to minimize deceleration over the glide, can change with variations in the body’s size and shape. The purpose of this study was to investigate the relationships between glide efficiency and the size and shape characteristics of swimmers. Eight male and eight female swimmers performed a series of horizontal glides at a depth of 70 cm below the surface. Glide efficiency parameters were calculated for velocities ranging from 1.4 to 1.6 m/s for female swimmers (and at the Reynolds number of 3.5 million) and from 1.6 to 1.8 m/s for male swimmers (and at the R

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Sahu, AK, S. Pattanayak, and S. Panda. "WEDM microdrilling of 316 L stainless steel orthopedic implant." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 17 (2020): 3416–35. http://dx.doi.org/10.1177/0954406220936302.

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The development in manufacturing has insisted upon the fabrication of microdrilled holes on orthopedic implants, with finished side wall (devoid of cracks and burr), thin recast layer, low taper, and improved circularity at entry and exit of the hole. In this study, therefore, a multiobjective optimization of wire electric discharge machining microdrilling response characteristics is addressed in order to improve the hole quality characteristics and viability of implants. To improve the quality characteristics of the hole, a hybrid statistical analysis is developed based on grey relational ana

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