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Journal articles on the topic 'Pitch surface'

Author: Grafiati

Published: 24 April 2022

Last updated: 30 July 2025

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1

Liu, Jen-Yu, and Hong-Sen Yan. "Surface Geometry of Variable Pitch Cylindrical Cams with Conical Meshing Elements." Journal of Mechanical Design 116, no. 3 (1994): 862–66. http://dx.doi.org/10.1115/1.2919461.

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This paper presents mathematical expressions for the surface geometry of variable pitch cylindrical cams with four conical meshing elements based on the theory of conjugate surfaces. The unit normal of the element is derived, with given surface geometry of the meshing element, by differential geometry. The contact lines of the conjugate surface are defined according to the equation of meshing and the specified input-output relation. By the coordinate transformation of contact lines, we have the complete profile of the variable pitch cylindrical cam. The results of this work are instrumental in

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2

FERREIRO, LARRIE D., TIMOTHY C. SMITH, WILLIAM L. THOMAS III, and ROBERTO MACEDO. "Pitch Stabilization for Surface Combatants." Naval Engineers Journal 106, no. 4 (1994): 174–91. http://dx.doi.org/10.1111/j.1559-3584.1994.tb03017.x.

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3

Vladimirov, V. Yu, S. Ya Khmel, and E. A. Chinnov. "Boiling heat transfer on modified copper surfaces with inhomogeneous wettability." E3S Web of Conferences 459 (2023): 05012. http://dx.doi.org/10.1051/e3sconf/202345905012.

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Experiments were carried out on biphilic surfaces made using two technologies. The first technology was the deposition of a fluoropolymer through special masks (100 μm spots and 500 μm pitch; 50 μm spots and 200 μm pitch) onto a smooth or pre-modified (silica micrococoon arrays) copper surface. The second technology consisted in the deposition of fluorinated methoxysilane on a copper surface with arrays of caverns preliminarily created by laser ablation (caverns size of the order of 70 μm, pitch - 780 μm), as a result of which deposition the caverns became superhydrophobic. The experiments wer

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4

NOGAMI, Sachiko, Fumihiko ANDO, Fumihiko TANIGUCHI, Akira TAKASHIMA, Kanako MURAKAMI, and Nobutaka ITO. "Surface Mount Technology Fine Pitch BGA." Journal of Japan Institute of Electronics Packaging 4, no. 1 (2001): 63–67. http://dx.doi.org/10.5104/jiep.4.63.

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Vladimirov, Victor, Sergey Khmel, and Evgeny Chinnov. "Boiling Heat Transfer On Biphilic Surfaces With Arrays Of Grooves." E3S Web of Conferences 578 (2024): 01003. http://dx.doi.org/10.1051/e3sconf/202457801003.

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Experiments were carried out on biphilic surfaces made using technology consisted in the deposition (105℃) of fluorinated methoxysilane on a copper surface with arrays of grooves preliminarily created by laser ablation, as a result of which deposition the grooves became superhydrophobic. Grooves were two types: parallel grooves and groove lattice. Size of grooves was 30-43 um, pitch for parallel grooves was 1-1,5 mm and for grove lattice – 1 mm. The experiments were carried out on distilled water at atmospheric pressure. For all surfaces, a significant intensification of heat transfer has been

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6

Turiman, Sharul Nizam, and Nasrul Hadi Johari. "Influence of boot stud shapes and pitch surfaces on rugby players’ sprinting performance." Malaysian Journal of Movement, Health & Exercise 12, no. 2 (2023): 53–60. http://dx.doi.org/10.4103/mohe.mohe_12_23.

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Introduction: In rugby, a player’s sprinting prowess emerges as a pivotal determinant for bridging the gap to opponents and eluding their pursuit. Hence, a proper rugby boot assumes paramount importance in enhancing sprinting capabilities. However, the tropical climate conditions in Malaysia, with high temperatures, humidity and heavy rainfall, possess the potential to rapidly degrade rugby pitch conditions, thereby exerting a pronounced impact on sprinting performance. Aims: This study aims to investigate the influence of different boot studs and pitch surfaces on the sprinting performance of

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7

Gang, LV. "Pitch curve design defects modification for non-circular bevel gear." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 12 (2014): 2231–41. http://dx.doi.org/10.1177/0954406214556666.

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A novel pitch curve design method for non-circular bevel gear is presented to simplify design of non-circular bevel gear. Pitch curve equation for non-circular bevel gear is deduced based on geometrical relationships between pitch cone surface of non-circular gear with parallel axis and spherical surface. Then, transmission ratio function is transformed into pitch curve design defects modification equation and mathematical expression between modification factor and pitch curve design parameters for non-circular bevel gear is derived. By using the expression, modification value of pitch curve c

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8

Watatani, Kazuki, Kyohei Terao, Fusao Shimokawa, and Hidekuni Takao. "A MEMS Tactile Sensor with Fingerprint-Like Array of Contactors for High Resolution Visualization of Surface Distribution of Tactile Information." Journal of Robotics and Mechatronics 32, no. 2 (2020): 305–14. http://dx.doi.org/10.20965/jrm.2020.p0305.

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In the present report, we have developed a tactile sensor with fingerprint-like array of contactors for obtaining the surface distribution of tactile information in high spatial resolutions. Six high resolution sensing modules of contactors with biaxial detectors were integrated in line at a pitch of 500 μm, the typical pitch of fingerprint ridges. Each sensing module independently detected the micro surface shape and locally generated frictional force on the object surfaces. Mechanical analysis of the fabricated sensors showed good sensitivities and highly linear responses. Consequently, the

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9

Clemente, Filipe Manuel, Adam Owen, Jaime Serra-Olivares, et al. "The effects of large-sided soccer training games and pitch size manipulation on time–motion profile, spatial exploration and surface area: Tactical opportunities." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 232, no. 2 (2017): 160–65. http://dx.doi.org/10.1177/1754337117722658.

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Analysis of the physical, technical and physiological variations induced through the use of different soccer game formats have been widely discussed. However, the coaching justification for the specific use of certain game formats based on individual and collective spatial awareness is unclear. As a result, the purpose of this study was to analyze 11 versus 11 game formats conducted across two pitch sizes (half-size: 54 m × 68 m vs full-size: 108 m × 68 m) to identify effects of time–motion profiles, individual exploration behavior and collective organization. A total of 10 amateur soccer play

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10

Budak, E. "An Analytical Design Method for Milling Cutters With Nonconstant Pitch to Increase Stability, Part I: Theory." Journal of Manufacturing Science and Engineering 125, no. 1 (2003): 29–34. http://dx.doi.org/10.1115/1.1536655.

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Chatter vibrations result in reduced productivity, poor surface finish and decreased cutting tool life. Milling cutters with nonconstant pitch angles can be very effective in improving stability against chatter. In this paper, an analytical stability model and a design method are presented for nonconstant pitch cutters. An explicit relation is obtained between the stability limit and the pitch variation which leads to a simple equation for determination of optimal pitch angles. A certain pitch variation is effective for limited frequency and speed ranges which are also predicted by the model.

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11

Köhler, Robert, Domenico Hellrung, Daniel Tasche, and Christoph Gerhard. "Quantification of Carbonic Contamination of Fused Silica Surfaces at Different Stages of Classical Optics Manufacturing." Materials 14, no. 7 (2021): 1620. http://dx.doi.org/10.3390/ma14071620.

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The chemical composition of ground and polished fused silica glass surfaces plays a decisive role in different applications of optics. In particular, a high level of carbon impurities is often undesirable for further processing and especially for gluing or cementing where adhesion failure may be attributed to carbonic surface-adherent contaminants. In this study, the surface carbon content at different stages of classical optics manufacturing was thus investigated. Two different standard processes—grinding and lapping with two final polishing processes using both polyurethane and pitch pads—we

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12

Şenyurt, Süleyman, and Abdussamet Çalışkan. "The quaternionic expression of ruled surfaces." Filomat 32, no. 16 (2018): 5753–66. http://dx.doi.org/10.2298/fil1816753s.

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In this paper, firstly, the ruled surface is expressed as a spatial quaternionic. Also, the spatial quaternionic definitions of the Striction curve, the distribution parameter, angle of pitch and the pitch are given. Finally, integral invariants of the closed spatial quaternionic ruled surfaces drawn by the motion of the Frenet vectors {t,n1,n2} belonging to the spatial quaternionic curve ? are calculated.

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13

Figliolini, Giorgio, and Jorge Angeles. "The Synthesis of the Pitch Surfaces of Internal and External Skew-Gears and Their Racks." Journal of Mechanical Design 128, no. 4 (2005): 794–802. http://dx.doi.org/10.1115/1.2202875.

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The synthesis of the pitch surfaces of any pair of external and internal skew gears, using dual algebra and the principle of transference, is the subject of this paper. The spatial motion of the Euclidean space is transferred to the dual space in order to obtain a simplified dual spherical motion, thus emulating the motion of bevel gears. The relative screw motion is hence analyzed by determining the position of the instant screw axis and the angular and sliding velocities. Moreover, the hyperboloid pitch surfaces of the driving and driven gears are synthesized, along with the helicoid pitch s

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14

Tsay, D. M., and B. J. Lin. "Profile Determination of Planar and Spatial Cams with Cylindrical Roller-Followers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 6 (1996): 565–74. http://dx.doi.org/10.1243/pime_proc_1996_210_231_02.

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A simple and useful procedure that can be used to determine profile surfaces of planar and spatial cams with cylindrical roller-followers is presented. Based on the rigid-body transformation between the cam and the roller-follower, the pitch (curve) surface which is the path of the point of the roller centre can be easily generated. Then the analytical profile surface of the cam can be represented by the offset surface of the pitch surface with a distance equal to the radius of the roller. To illustrate the ease and effectiveness of the approach, analytical expressions of profile surfaces of a

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15

Wang, Xiaoyi, Kunlei Zheng, Longyuan Xiao, et al. "Flexspline Pitch Deviation Rapid Measurement Method Using Offset Point Laser Sensors." Machines 12, no. 6 (2024): 381. http://dx.doi.org/10.3390/machines12060381.

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Flexsplines in harmonic gear reducers are usually characterized by a large number of teeth, small modulus, and poor stiffness, which makes them difficult to measure using conventional gear measuring centers. In order to efficiently evaluate the quality of flexsplines in harmonic gear reducers, a rapid measurement method for flexspline pitch using offset point laser sensors (PLS) is proposed. This paper investigates the principle of measuring the tooth flank of the flexspline under the offset of the PLS, establishes a model for collecting and analyzing gear surface data, builds an experimental

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16

Nie, Qi, Meiqiu Li, and Sizhu Zhou. "Structural Parameter Optimization of the Helical Blade of the Variable-Pitch, Downhole, Cyclone Separator Based on the Response Surface Method." Energies 15, no. 18 (2022): 6839. http://dx.doi.org/10.3390/en15186839.

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Aiming at the problems of pipeline blockage and equipment wear caused by large sand production in shallow gas hydrate mining on the seabed, based on the solid-state fluidization mining method, the idea of in situ separation of natural gas hydrate is proposed, and the downhole design is based on the physical parameters of hydrate mixed slurry. For the in situ helical separator, the CFD-Fluent commercial software was used to establish an analysis model and optimize the response surface of the model. The effects of the three-stage variable-pitch helix and blades on the performance of the separati

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17

Jian, Kengqing, Hong-Shig Shim, Daniel Tuhus-Dubrow, et al. "Liquid crystal surface anchoring of mesophase pitch." Carbon 41, no. 11 (2003): 2073–83. http://dx.doi.org/10.1016/s0008-6223(03)00203-3.

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18

Yamada, Kenji, Yoshiki Kawata, Masafumi Amano, et al. "Influence of Pitch on Surface Dose Distribution and Image Noise of Computed Tomography Scans." Sensors 23, no. 7 (2023): 3472. http://dx.doi.org/10.3390/s23073472.

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This study evaluated the effect of pitch on 256-slice helical computed tomography (CT) scans. Cylindrical water phantoms (CWP) were measured using axial and helical scans with various pitch values. The surface dose distributions of CWP were measured, and reconstructed images were obtained using filtered back-projection (FBP) and iterative model reconstruction (IMR). The image noise in each reconstructed image was decomposed into a baseline component and another component that varied along the z-axis. The baseline component of the image noise was highest at the center of the reconstructed image

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19

Zhang, Mingyuan, Yuanzhe Huang, Haining Liu, Fajia Li, and Yuquan Cai. "An investigation on the effect of thread pitch on the self-loosening of bolted joint caused by fretting wear." Journal of Physics: Conference Series 2535, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2535/1/012017.

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Abstract To study the effect of thread pitch on the bolt loosening behavior with consideration of fretting wear, the loosening experiments and finite element analysis were carried out to the bolts with different thread pitches. The experimental results demonstrate that fretting wear existed on the thread surface. It caused a slow bolt loosening without the nut rotation. With the thread pitch increases, the clamping force will become smaller, so that the fretting wear on the thread surface will also decrease, indicating that lager thread pitch could increase the anti-loosening ability through a

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20

Pei, Lei, Zhitao Xiao, Lei Geng, Jun Wu, Fang Zhang, and Ying Sun. "Surface parameters measurement for braided composite preform based on gray projection." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501988762. http://dx.doi.org/10.1177/1558925019887621.

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In this article, a method based on gray projection is proposed for automatic measurement of surface braiding angle and pitch length of braided composite preforms. The surface braiding angles are measured by rotated gray projection. First, the original image is preprocessed using Lab transform and block-matching and three-dimensional filter. Then, edge map of gray scale is acquired based on phase congruency and non-maximum suppression. Third, edge direction angles are computed by image rotation and gray projection. Finally, the average surface braiding angles are measured from the edge directio

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21

Malacas, J. D., L. V. R. Certeza, B. A. Alfonso, M. H. Clerigo, G. A. Tiangco, and C. P. Valencia. "Heat transfer optimization in a horizontal helical-shaped ground heat exchanger through response surface methodology." IOP Conference Series: Earth and Environmental Science 1094, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1755-1315/1094/1/012008.

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Abstract Various combinations of objective functions and design variables have been considered in several optimization studies of ground heat exchangers (GHEs). In this study, the optimum values of the coil pitch and coil diameter of a helical-shaped GHE were determined to maximize its convection heat transfer rate. Central composite design was used to determine the coil pitch and coil diameter dimensions to be used in GHE modeling. Nine models were generated in Fusion360 which were then exported to ANSYS Fluent for CFD simulation. Then, a second-order model of the convective heat transfer rat

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22

Kohira, Hidekazu, Hideaki Tanaka, Masaaki Matsumoto, and Frank E. Talke. "Investigation of Slider Vibrations Due to Contact With a Smooth Disk Surface." Journal of Tribology 123, no. 3 (2000): 616–23. http://dx.doi.org/10.1115/1.1308045.

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The dynamic behavior of pico sliders is investigated during slider-disk contacts as a function of velocity, pitch angle, crown height, and lubricant thickness using laser Doppler vibrometry and acoustic emission sensors. Analog and digital filtering methods are applied to distinguish air bearing and slider body resonances from frequencies related to disk runout, load beam design, and gimbal structure. Sliders with high pitch angle and small crown were found to exhibit smaller vibration amplitudes after slider-disk contacts than sliders with low pitch angle or large crown. The lubricant thickne

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23

Zhang, Jin Cai, Jing Li Shi, Xue Min Guo, Quan Gui Guo, and Lang Liu. "Microstructure and Reaction Mechanism during Fluorination of Isotropic Pitch." Applied Mechanics and Materials 174-177 (May 2012): 44–49. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.44.

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Isotropic pitch fluorides were prepared via the reaction of isotropic pitch with gas mixture containing F2 and N2 in a rotation nickel reactor. Isotropic pitch fluorides were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and elemental analysis. The results showed that the interlayer spacing of the resultant materials dramatically increase from 0.345 nm of the isotropic pitch to the range 0.643 nm to 0.798 nm. Further studies on the diversity of the functional groups indicated that the whole reacti

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Safari, Mehdi, Ricardo Alves de Sousa, and Jalal Joudaki. "Fabrication of Saddle-Shaped Surfaces by a Laser Forming Process: An Experimental and Statistical Investigation." Metals 10, no. 7 (2020): 883. http://dx.doi.org/10.3390/met10070883.

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Laser forming is a powerful tool for fabricating complicated shapes economically. The pattern of laser movement (irradiating scheme) has an essential effect on the shaped form. In this article, the forming of a saddle-shaped surface will be investigated experimentally by the laser forming process. A spiral irradiating scheme is implemented to manufacture a saddle-shaped surface. The main idea of this study is the investigation of the simultaneous variations of the process parameters and their effect on the curvature of the final part. The process parameters of the study are the spiral pitch, n

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25

Balajti, Zsuzsanna, and Zoltán Mándy. "The influence of the position and shape geometry of the counter-conical motion transmitter pin on the pitch fluctuation of the spiroid worm machined with adjusted shaft." Multidiszciplináris tudományok 12, no. 4 (2022): 127–36. http://dx.doi.org/10.35925/j.multi.2022.4.13.

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The difference between the mathematical defined shape of the conical helicoid surface and the operating surface of the spiroid worm produced with axis adjustment on a thread grinding machine results – among other things –in thread pitch fluctuation. During the manufacturing of conical helicoid surfaces the transmission of the rotation from the main spindle to the worm shaft can be realised by a driving pin and an adjusted lathe dog. This article deals with the examination of the fluctuation of the thread pitch parameter occurring when using a counter-conical drive pin. The fluctuation is descr

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26

Xiao, Zhitao, Lei Pei, Fang Zhang, et al. "Parameter Measurement of Biaxial Braided Composite Preform Based on Phase Congruency." Autex Research Journal 19, no. 1 (2019): 8–16. http://dx.doi.org/10.1515/aut-2018-0012.

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Abstract In this paper, a new method based on phase congruency is proposed to measure pitch lengths and surface braiding angles of two-dimensional biaxial braided composite preforms. Lab space transform and BM3D (block-matching and 3D filter) are used first to preprocess the original acquired images. A corner detection algorithm based on phase congruency is then proposed to detect the corners of the preprocessed images. Pitch lengths and surface braiding angles are finally measured based on the detected corner maps. Experimental results show that our method achieves the automatic measurement o

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27

Liu, Xiaoxu, Xianlong Ni, Osamu Konda, Hiroko Furuhashi, Satoru Maegawa, and Fumihiro Itoigawa. "Clarification of the Mechanism of Pulse Laser Grinding of Nanosecond Lasers Using High-Speed Camera Imaging." Machines 10, no. 3 (2022): 196. http://dx.doi.org/10.3390/machines10030196.

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Pulse laser grinding (PLG), as a cutting tool processing method, can not only achieve edge sharpening with high precision, but it can also produce surface modification. For example, polycrystalline cubic boron nitride (PCBN) tools processed by PLG can show increased hardness due to the reduction in defects. However, the mechanism of edge formation under PLG processing remains unclear. In this study, by observing the plasma generated during processing using a high-speed camera, the elementary process for each laser pulse of the PLG process was visualized. The plasma luminescence moved successiv

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28

Hasuike, Noriyuki, Saito Ochiai, Ryotaro Iwakiri, Minoru Takeda, Woo Sik Yoo, and Toshiyuki Isshiki. "Surface Plasmon Resonances in Sn: In2O3 Thin Films with Diffraction Grating." Proceedings 2, no. 13 (2018): 1034. http://dx.doi.org/10.3390/proceedings2131034.

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We newly proposed transparent conductive oxide with diffraction grating structure as an excitation field of surface plasmon resonance working at near-infrared spectral region. We experimentally demonstrated the excitation of SPR using Sn-doped In2O3 films with micro-meter pitched diffraction grating. In this study, we considered the correlation between the grating pitch and the optical reflection spectra. Reflection spectra showed clear polarization properties in infrared spectral region, and the reflection edge has also correlation with the pitch of grating. From these results, the excitation

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29

Brito, Ângelo, Paulo Roriz, Pedro Silva, Ricardo Duarte, and Júlio Garganta. "Effects of the Pitch Surface on Displacement of Youth Players During Soccer Match-Play." Journal of Human Kinetics 65, no. 1 (2018): 175–85. http://dx.doi.org/10.2478/hukin-2018-0046.

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Abstract The aim of this study was to analyze the effect of different pitch surfaces (artificial turf, natural turf and dirt field) on positioning and displacement of young soccer players (age: 13.4 ± 0.5 yrs; body height: 161.82 ± 7.52 cm; body mass: 50.79 ± 7.22 kg and playing experience: 3.5 ± 1.4 yrs). Data were collected using GPS units which allowed to calculate spatial distribution variability, assessed by measuring entropy of individual distribution maps (ShannEn). Ellipsoidal areas (m2) representing players’ displacement on the pitch, centred on the average players’ positional coordin

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30

Cai, Yukui, Wenlong Chang, Xichun Luo, and Yi Qin. "Superhydrophobicity of microstructured surfaces on zirconia by nanosecond pulsed laser." Journal of Micromanufacturing 2, no. 1 (2018): 5–14. http://dx.doi.org/10.1177/2516598418799933.

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This article presents a systematic approach to improve the hydrophobicity of microstructured surfaces. It includes a contact angle prediction model for microstructures obtained by nanosecond pulsed laser. Combining with the theoretical constraints for stable Cassie–Baxter state, this approach can be used to optimize microstructures dimensions for maximizing surface hydrophobicity. Laser machining experiments were conducted to evaluate the prediction model. It shows that the proposed systematic approach can accurately predict the contact angle and obtain microstructures dimensions for maximizin

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31

TIJERO, ANTONIO, M. CONCEPCIÓN MONTE, JULIO TIJERO, and ANGELES BLANCO. "Pitch detackification with natural and modified talcs." October 2011 10, no. 10 (2011): 53–59. http://dx.doi.org/10.32964/tj10.10.53.

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Pitch deposition in pulp or in different parts of the manufacturing system can lead to a decrease in the quality of the final paper produced and to manufacturing efficiency problems. One of the methods to control pitch deposition is the use of talc. Talc acts primarily as a detackifier and must be part of the deposit to control further deposition. The effectiveness of talc as a control agent depends on its structural and surface characteristics (e.g., specific surface, surface energy, surface charge, and ratio of lypophilic to hydrophilic surface), which are related to its mineral composition

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Qian, WJ, ZQ Huang, H. Ouyang, GX Chen, and HJ Yang. "Numerical investigation of the effects of rail vibration absorbers on wear behaviour of rail surface." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 3 (2018): 424–38. http://dx.doi.org/10.1177/1350650118785061.

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Rail corrugation refers to the periodic wear of the top working surfaces of rails. This problem has plagued the railway industry over a hundred years. In the present paper, the effects of rail vibration absorbers on wear behaviour of the rail surface have been studied. The dynamic model of a wheel–rail–absorber system is established. The friction contact coupling between the wheel and the rail are fully considered in this model. A wear model, in which the mass loss of unit area in contact patch is proportional to frictional work per unit area between the wheel and the rail, is developed to ana

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33

Dyadya, Sergei, Yelena Kozlova, Anton Germashev, and Viktor Logominov. "SIMULATION OF THE MACHINED SURFACE AFTER END MILLING WITH SELF-OSCILLATIONS." Cutting & Tools in Technological System, no. 94 (June 16, 2021): 19–27. http://dx.doi.org/10.20998/2078-7405.2021.94.03.

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Thin-walled parts are widely used in the aviation industry. It is mainly carried out with end mills and is accompanied by self-oscillation during rough milling. They negatively affect the quality of the machined surface. Therefore, it is important to model it taking into account the dynamics of the milling process to predict the accuracy. In the early works of the authors, the mechanism of the profile forming of the machined surface was determined. In this case, the identity of the shape of the cutting surface and the oscillogram of part’s oscillations during milling is taken as a basis. The f

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34

Tang, Jin Yuan, Qi Bo Wang, and Cai Wang Luo. "Study on Effect of Surface Friction on the Dynamic Behaviours of Cylindrical Gear Transmission." Advanced Materials Research 139-141 (October 2010): 2316–21. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2316.

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The effect of surface friction on the dynamic response of spur gear pair is investigated in this paper. Firstly, surface friction during the mesh is described briefly, and realistic time-varying tooth stiffness and realistic static transmission error are introduced. Subsequently, the differential equation of the torsional vibration of gear transmission is developed in which the realistic time-varying stiffness and realistic static transmission error are incorporated. Finally, using the numerical simulation method, the solutions in time domain and spectrum graphs of the nonlinear system are obt

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35

Ho, J. Y., and K. C. Leong. "Filmwise Condensation of Steam on Pin Fin Arrays Fabricated by Selective Laser Melting." Defect and Diffusion Forum 390 (January 2019): 71–82. http://dx.doi.org/10.4028/www.scientific.net/ddf.390.71.

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In this study, nine vertical flat plates of pin fin arrays were fabricated by selective laser melting to investigate the possible enhancements of external condensation. These specimens are cylindrical pin fins of the same fin diameter of 300 μm but are of different fin heights (l) and fin pitches (p) from 300 μm to 900 μm. Experiments were conducted in a condensation chamber with near quiescent vapor to simulate free-convection condensation. The aim is to investigate the effects of fin pitch and fin height on the condensation heat transfer performance of the surfaces. The results of this study

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36

Денисова, Е., E. Denisova, Тимур Хуснетдинов, Timur Husnetdinov, Марианна Воронина, and Marianna Voronina. "Projection by Conical Helical Lines With Constant Pitch." Geometry & Graphics 6, no. 3 (2018): 13–19. http://dx.doi.org/10.12737/article_5bc4563ccf6884.11983902.

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This paper’s purpose is investigation of non-traditional projection systems and their projecting surfaces, the choice of such congruence parameters for conical helical lines, which allow cover the whole complex of requirements to the surface, obtained by projecting of an arbitrary flat or spatial line with congruence beams, as well as the use of computer graphics in surface visualization. In the paper has been presented an example of analytical interpretation for an image of curvilinear projection by conical helical lines with constant pitch, and a congruence example for conical helical lines

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37

Fauzi, R., I. Jaya, and M. Iqbal. "Unmanned Surface Vehicle (USV) performance test in Bintan Island Waters." IOP Conference Series: Earth and Environmental Science 944, no. 1 (2021): 012013. http://dx.doi.org/10.1088/1755-1315/944/1/012013.

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Abstract An unmanned surface vehicle (USV) is an unmanned vehicle that is operated on the surface of the water for certain purposes, for example, bathymetry measurement, underwater imaging, etc. These unmanned surface vehicles can be used in impassable waters for crewed vessels in dangerous waters. This research measures the movement of the vehicle acceleration and then calculates it as the USV roll and pitch values. The direction of movement and wind speed and the height of the water surface at low tide are also aspects measured in this research. An accelerometer is a sensor that can measure

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Xia, Jing, Shuxiang Li, Yuan Gao, Dakui Zhang, Chunfeng Mu, and Zhanqiang Xue. "The Effect of Binder on the Electrochemical Property of Silicon/carbon Anode." Highlights in Science, Engineering and Technology 117 (September 27, 2024): 37–42. http://dx.doi.org/10.54097/9yty6721.

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In this research, needle coke, graphite and silicon nanosheet were bonded by pitch or glucose to prepare the Si/C composite anode. The influence of binder on the microstructure and electrochemical property of Si/C anode was discussed. The sample using pitch as binder has smooth surface and is densely coated by pitch. The silicon is exposed on the surface of Si/C compound using glucose as the binder. Compared with pitch-based Si/C anode, glucose-based Si/C anode shows higher initial capacity and coulombic efficiency, but it’s capacity retention ratio is lower. The initial capacity, initial coul

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Sang, Le Quang, Qing’an Li, Takao Maeda, et al. "Study Method of Pitch-Angle Control on Load and the Performance of a Floating Offshore Wind Turbine by Experiments." Energies 16, no. 6 (2023): 2762. http://dx.doi.org/10.3390/en16062762.

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Offshore wind energy is a renewable energy source that is developing fast. It is considered to be the most promising energy source in the next decade. Besides, the expanding trend for this technology requires the consideration of diversified seabeds. In deep seabeds, floating offshore wind technology (FOWT) is needed. For this latter technology, such as for conventional WT, we need to consider aspects related to performance, aerodynamic force, and forces during operation. In this paper, a two-bladed downwind wind turbine model is utilized to conduct experiments. The collective pitch and cyclic

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Zheng, Hai-bo, Jiang-tao Huang, Cheng-jun He, Bin Wu, and Chao Gao. "A novel thrust vector nozzle with conical surface based on Coanda effect." Journal of Physics: Conference Series 2472, no. 1 (2023): 012002. http://dx.doi.org/10.1088/1742-6596/2472/1/012002.

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Abstract In this paper, a novel thrust vector control method based on Coanda effect is proposed for conical surface. The effect of thrust vector control is studied by computation fluid dynamic (CFD) numerical simulation. When there is no side plate on both sides of Coanda surface, there are large vortex structures on both sides of nozzle wake, and the vector control cannot be realized. After adding the side plate, the comprehensive control of the pitch and yaw thrust vectors was realized. When the nozzle pressure ratio (NPR) is 2~2.4, the pitch and yaw vector angles decreased with the increase

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Graham, T. A., and P. A. Sullivan. "Pitch-Heave Dynamics of a Segmented Skirt Air Cushion." Journal of Ship Research 46, no. 02 (2002): 121–37. http://dx.doi.org/10.5957/jsr.2002.46.2.121.

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The formulation and experimental validation of a mathematical model of the nonlinear pitch-heave dynamics of an uncompartmented, segmented skirt cushion system for an air cushion vehicle are described. This system relies on surface contact to attain static stiffness in pitch and roll. The formulation includes a dynamic model of the lift air system, the effect of segment flexibility on effective cushion capacitance and on hovergap, and hysteretic skirt-surface contact forces. Predictions of linear stability and of nonlinear response to pitch disturbances are made for two skirt materials, the fi

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Wu, Zian, Wenxian Yang, Xiaoping Song, and Kexiang Wei. "Study on Condition Monitoring of Pitch Bearings Based on Stress Measurement." Machines 12, no. 3 (2024): 154. http://dx.doi.org/10.3390/machines12030154.

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Pitch bearings in wind turbines are crucial components that enable safe blade pitching, optimize electrical power output, and ensure turbine protection. Traditional vibration analysis-based methods used for high-speed bearings are not applicable to monitoring pitch bearings, due to its slow non-integer cycle rotation. To address this issue, a stress-based pitch bearing monitoring method is proposed in this paper. First, finite element analysis is conducted to establish the relationship between the maximum surface stress on the outer race of the pitch bearing and the presence of cracks. This re

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Ding, Jia Li, Yu Qiong Zhao, Yong Fa Zhang, and Ya Li Fu. "Influence of Non-Pitch Based Activated Carbon on Flue Gas Desulfurization." Applied Mechanics and Materials 316-317 (April 2013): 1055–58. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.1055.

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A new type of activated carbon for flue gas desulfurization is obtained by carbonization of non-pitch based formed-coal and characterized by the BET method. The results indicate that the activated carbon with non-pitch binder has higher mechanical strength and sulfur absorptive capacity than the pitch-based activated carbon at adding the same quantity binder. When the addition of non-pitch binder reaches 15.0 wt. %, the activated carbon exhibits the optimum performance. The characterization result shows that the activated carbon with non-pitch binder presents a more developed micro-pore struct

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Yang, Zhaolong, Zaojian Zou, and Xuegang Wang. "The Method for Analyzing the Pitching Motion Pattern of a New Surface Unmanned Wing-sliding Boat." Journal of Physics: Conference Series 2419, no. 1 (2023): 012110. http://dx.doi.org/10.1088/1742-6596/2419/1/012110.

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Abstract In this paper, a new surface unmanned wing skate (NUSV) is taken as the research object, and the free decay model test under different drafts and different initial pitch angles is completed. In the case of specially selected regular waves, typical swaying tests against waves and waves were carried out. Four mathematical models for system identification of pitch motion modes are established. Based on the system identification theory and the programming idea of the improved genetic algorithm, the NUSV pitch motion mode system identification software is written in C# language. The system

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Zhang, Qingle, Yiqing Shao, Chengmeizi Wang, Lu Wang, Huimin Zhou, and Xin Xia. "Preparation of fluorine-free anti-acid and breathable composite fabric based on modified SBS/pitch electrospun nanofibers." Textile Research Journal 91, no. 13-14 (2021): 1535–45. http://dx.doi.org/10.1177/0040517520982588.

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To develop a fluorine-free material of acidproof and breathable fabric, styrene–butadiene–styrene (SBS) blended with pitch was directly deposited on polyester/cotton blended fabric through electrospinning to fabricate a nanofibrous membrane composite fabric. Acrylic acid (AA) and methyl methacrylate (MMA) were used to graft SBS to improve compatibility between SBS and pitch, and the modified temperatures were set at 40°C, 60°C and 80°C. The effects of different grafting monomers and temperatures on the properties of SBS/pitch membrane composite fabrics were explored by Fourier transform infrar

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PARK, JE-WOONG, IN-YOUNG YANG, KIL-SUNG LEE, et al. "ONE-SIDED ULTRASONIC CHARACTERIZATION OF CFRP COMPOSITE LAMINATES." Modern Physics Letters B 22, no. 11 (2008): 815–19. http://dx.doi.org/10.1142/s0217984908015437.

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Ultrasonic NDE of composite laminates is usually analyzed on the backwall echoes of the specimen. In the inspection of actual composite structures, the back surface of the part was curved or contained complex geometry and did not provide a usable backwall echo. In this work, a one-sided pitch-catch setup was used in the detection and evaluation of flaws and material anomalies in solid composite laminates. Two miniature potted Rayleigh wave transducers (for generating surface waves in contact mode on steel) were joined head-to-head and used in the pitch-catch mode on the surface of composites.

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Dong, Liangliang, Jing Wang, and Xiaohua Zhu. "Design and mechanical behavior study of ultrahigh-torque variable pitch casing joint." Advances in Mechanical Engineering 11, no. 1 (2019): 168781401881408. http://dx.doi.org/10.1177/1687814018814084.

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The top drive for casing running system can effectively avoid borehole neck down and sticking, reducing construction period by about 50%. However, the casing will bear higher torque load, and the casing joint threads can meet the bearing performance, which have a critical impact on casing running and the life of oil and gas wells. Variable pitch can reduce thread stress concentration and improve load-bearing strength. Lacking research on mechanical behavior has greatly restricted the development of variable pitch thread. This article generated a variable pitch casing joint thread helix forming

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Bandyopadhyay, Promode R., Sahjendra N. Singh, and Francis Chockalingam. "Biologically-Inspired Bodies Under Surface Waves—Part 2: Theoretical Control of Maneuvering." Journal of Fluids Engineering 121, no. 2 (1999): 479–87. http://dx.doi.org/10.1115/1.2822234.

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The theoretical control of low-speed maneuvering of small underwater vehicles in the dive plane using dorsal and caudal fin-based control surfaces is considered. The two dorsal fins are long and are actually mounted in the horizontal plane. The caudal fin is also horizontal and is akin to the fluke of a whale. Dorsal-like fins mounted on a flow aligned vehicle produce a normal force when they are cambered. Using such a device, depth control can be accomplished. A flapping foil device mounted at the end of the tailcone of the vehicle produces vehicle motion that is somewhat similar to the motio

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Sariaydin, Muhammed T., Talat Korpinar, and Vedat Asil. "On parallel p-equidistant ruled surfaces by using mofied orthogonal frame with curvature in E³." Boletim da Sociedade Paranaense de Matemática 40 (January 1, 2022): 1–7. http://dx.doi.org/10.5269/bspm.40601.

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In this paper, it is investigated Ruled surfaces according to modified orthogonal frame with curvature in 3-dimensional Euclidean space. Firstly, we give apex angle, pitch and drall of closed ruled surface in E³. Then, it characterized the relationship between these invariant of parallel p-equidistant ruled surfaces.

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Pathak, Sunil, and Neelesh Kumar Jain. "Performance of pulsed-electrochemical honing and pulsed-electrochemical finishing in improving quality of bevel gears." Manufacturing Review 5 (2018): 14. http://dx.doi.org/10.1051/mfreview/2018012.

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This article presents a comparative study concerning performance of pulsed-electrochemical honing (PECH) and pulsed-electrochemical finishing (PECF) in straight bevel gear finishing. Performance of these processes were compared in terms of average percentage difference in the considered parameters of surface features of bevel gear namely average percentage differences in average surface roughness ‘PDRa’, maximum surface roughness ‘PDRmax’ and depth of surface roughness ‘PDRz’, micro-geometry (i.e. average percentage differences in single pitch error ‘PDfp’, adjacent pitch error ‘PDfu’, cumulat

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