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Journal articles on the topic 'Range of center of gravity position'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Tsukanov, Ruslan, and Viktor Riabkov. "Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics." Aerospace technic and technology, no. 5 (October 6, 2021): 4–14. http://dx.doi.org/10.32620/aktt.2021.5.01.

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A problem facing world commercial aviation is a provision of the flight range and an increase in the fuel efficiency of transport category airplanes using fuel trim transfer application, which allows for decreasing airplane trim drag at cruise flight. In the existing mathematical models, center-of-gravity position is usually assumed fixed, but with fuel usage, center-of-gravity shifts within the definite range of center-of-gravity positions. Until the fuel trim transfer was not used in airplanes, the center-of-gravity shift range was rather short, that allowed to use the specified assumption w

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Tsukanov, Ruslan U., та Victor I. Ryabkov. "ОЦІНКА ВПЛИВУ ЦЕНТРУВАННЯ НА АЕРОДИНАМІЧНУ ЯКІСТЬ, ПОЛЯРУ І ДАЛЬНІСТЬ ПОЛЬОТУ ЛІТАКА". Open Information and Computer Integrated Technologies, № 93 (19 листопада 2021): 135–45. http://dx.doi.org/10.32620/oikit.2021.93.08.

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The method of transport category airplane flight range estimation taking into account its center-of-gravity position variation in the process of fuel utilization at cruising flight mode is presented. The method structure includes the following models:– Interinfluence of main parameters on each other in the process of fuel utilization;– Estimation of CG position influence on lift-to-drag ratio in cruising mode;– Quantitative estimation of center-of-gravity position variation influence on airplane flight range.Simulation of the main parameters is based on authoring researches, establishing inter

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Tsukanov, R., V. Ryabkov та O. Los. "ВПЛИВ ЗМІНИ ЦЕНТРУВАННЯ НА ДАЛЬНІСТЬ ПОЛЬОТУ ЛІТАКА ТРАНСПОРТНОЇ КАТЕГОРІЇ". Open Information and Computer Integrated Technologies, № 88 (6 листопада 2020): 5–14. http://dx.doi.org/10.32620/oikit.2020.88.01.

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The method of transport category airplane flight range estimation taking into account its center-of-gravity position variation in the process of fuel utilization at cruising flight mode is presented. The method structure includes the following models:– Interinfluence of main parameters on each other in the process of fuel utilization;– CG position influence on required thrust values in level flight;– Estimation of CG position influence on lift-to-drag ratio in cruise mode;– Quantitative estimation of center-of-gravity position variation influence on airplane flight range.Simulation of the main

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Blaszczyk, Janusz W., Paul D. Hansen, and Deborah L. Lowe. "Postural Sway and Perception of the Upright Stance Stability Borders." Perception 22, no. 11 (1993): 1333–41. http://dx.doi.org/10.1068/p221333.

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Decline in the perception of the borders of postural stability due to increase in sway was evaluated in young and elderly subjects. Ranges of lateral and anteroposterior postural sway were measured in eleven young and eleven elderly subjects during maximum voluntary excursions of center of gravity while leaning forward, backward, left, and right. In both age groups, displacement of the center of gravity out of the reference position resulted in increases in the range of sway in the plane corresponding to the direction of lean. Young subjects who further displaced their center of gravity within

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Hernawati, Heni. "Analisis Akustik Bunyi Sibilant Bahasa Jepang pada Pembelajar Bahasa Jepang di Indonesia yang Berbahasa Ibu Bahasa Jawa." Chi'e: Journal of Japanese Learning and Teaching 8, no. 2 (2020): 156–63. http://dx.doi.org/10.15294/chie.v8i2.40903.

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Abstract This study aims to analyze the characteristics of Japanese sibilant sound observed from the acoustic analysis. The data of this study were in the form of sound samples from 16 respondents who spoke Javanese in Japanese language learners at the university and 8 Japanese native speakers. The respondents were asked to pronounce vocabulary containing Japanese sibilant sounds at the beginning and middle of a total of 72 words which have meaning. Then, the sample of Indonesian and Japanese respondent's sound was measured using Praat software to find their duration, intensity and Cente

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NAKAGAWA, Chihiro, Atsuhiko SHINTANI, Tomohiro ITO, Kuniharu OKUDA, and Koji NONAKA. "1118 Basic Measurement of Range of Gravity Center According to Foot Position in a Standing Posture." Proceedings of Conference of Kansai Branch 2012.87 (2012): _11–18_. http://dx.doi.org/10.1299/jsmekansai.2012.87._11-18_.

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Osokin, A. V., V. I. Shemonaev, M. A. Postnikov, and A. N. Parkhomenko. "Indicators of body postural balance plotted in time during the total occlusal reconstruction (pilot study)." Russian Osteopathic Journal, no. 2 (June 22, 2024): 95–112. http://dx.doi.org/10.32885/2220-0975-2024-2-95-112.

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Aims – to study the dynamics of postural balance indicators in the process of total reconstruction of dentition occlusion.Materials and methods. The prospective study included 48 patients receiving dental orthopedic treatment for pathology of hard dental tissues and partial absence of teeth. Monitoring of postural status was carried out according to stabilometric studies and photometry of the direction and angular values of deviations of the general center of gravity of the body, the centers of gravity of body regions and the lines of their boundaries.Results. Before treatment, the examined pa

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Richter, Martinus, Francois Lintz, Stefan Zech, and Stefan Andreas Meissner. "Combination of PedCAT Weightbearing CT With Pedography Assessment of the Relationship Between Anatomy-Based Foot Center and Force/Pressure-Based Center of Gravity." Foot & Ankle International 39, no. 3 (2017): 361–68. http://dx.doi.org/10.1177/1071100717744206.

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Background: A customized pedography sensor (Pliance; Novel, Munich, Germany) was inserted into a pedCAT (Curvebeam, Warrington, PA). The aim of this study was to analyze the relative position of the anatomical foot center (FC) and the pedographic center of gravity (COG). The hypothesis was that FC should be a good predictor of mediolateral position of COG but not longitudinal since hindfoot anatomy allows free anteroposterior movement but limited mediolateral movement. Methods: In 90 patients (180 feet), a pedCAT scan with simultaneous pedography with full weightbearing in a standing position

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Yahya, M. F. O., and F. Kocak. "Determination of Position Resolution for LYSO Scintillation Crystals Using Geant4 Monte Carlo Code." Advances in High Energy Physics 2021 (September 14, 2021): 1–5. http://dx.doi.org/10.1155/2021/9931708.

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LYSO scintillation crystals, due to their significant characteristics such as high light yield, fast decay time, small Moliére radius, and good radiation hardness, are proposed to be used for the electromagnetic calorimeter section of the Turkish Accelerator Center Particle Factory (TAC-PF) detector. In this work, the center of gravity technique was used to determine the impact coordinates of an electron initiating an electromagnetic shower in a LYSO array, in a calorimeter module containing nine crystals, each 25 mm × 25 mm in cross-section and 200 mm in length. The response of the calorimete

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Iosilevskii, Gil. "Longitudinal Stability Criteria for a Propeller-Driven Aircraft." International Journal of Aerospace Engineering 2010 (2010): 1–7. http://dx.doi.org/10.1155/2010/762329.

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The Routh criterion is used to assess longitudinal dynamic stability of a propeller-driven aircraft. Under a few plausible assumptions on possible ranges of the pertinent stability derivatives, it reduces to a pair of simple conditions imposing a traditional aft limit (the forward of the maneuver and the neutral-speed-stability points) on the center-of-gravity position and an upper limit on the longitudinal moment of inertia. It is demonstrated that most aircraft have sufficiently small inertia to remain stable as long as their center-of-gravity is properly placed. At the same time, sailplane-

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Kim, Min-Kyu, Dong-Jin Park, Yeong-Seok Oh, Jong-Hwa Kim, and Jin-Kyu Choi. "Towfish Attitude Control: A Consideration of Towing Point, Center of Gravity, and Towing Speed." Journal of Marine Science and Engineering 9, no. 6 (2021): 641. http://dx.doi.org/10.3390/jmse9060641.

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This paper deals with the attitude control of a towfish (underwater towed vehicle) with two elevators and a single rudder to improve the image quality of an attached sound navigation ranging (sonar) system. Image distortion can occur if the towfish shakes excessively. Since a towfish is connected to the mother ship through a towing cable and the motion of the towfish is affected not only by the motion of the cable, but also by the position of the center of gravity, towing point, and towing speed, it is necessary to analyze how these factors affect the towfish to appropriately control its attit

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Hamdi, W., M. Mazouz, and S. Chaibi. "Multilayer perceptron approach for determining the centroid position of the electromagnetic shower in laterally segmented calorimeter." Journal of Instrumentation 20, no. 02 (2025): T02006. https://doi.org/10.1088/1748-0221/20/02/t02006.

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Abstract This paper presents a method employing a Multi-Layer Perceptron (MLP) neural network to enhance the spatial resolution of laterally segmented electromagnetic calorimeters. The study, based on GEANT4 simulations, explores the impact of different MLP architectures and hyperparameters on spatial resolution across a range of calorimeter block sizes and incident photon energies from 1 GeV to 10 GeV. Optimal configurations are identified, including the number of input neurons, hidden layers, and neurons per layer. The optimized MLP model consistently outperforms the widely used center of gr

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Richter, Martinus, Francois Lintz, Stefan Zech, and Stefan Meissner. "Combination of PedCAT with Pedography Shows Relationship of Morphology (Bone) Based Foot Center (FC) and Force/Pressure Based Center of Gravity (COG)." Foot & Ankle Orthopaedics 2, no. 3 (2017): 2473011417S0003. http://dx.doi.org/10.1177/2473011417s000339.

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Category: Basic Sciences/Biologics Introduction/Purpose: PedCAT (Curvebeam, Warrington, USA) is a technology for 3D-imaging with full weight bearing which has been proven to exactly visualize the 3D-bone position. Center of gravity (COG) and Foot Center (FC) are discussed to be important parameters for corrections/fusion around the hindfoot and for total ankle replacement. For this study a customized pedography sensor (Pliance, Novel, Munich, Germany) was inserted into the pedCAT. The aim of this study was to analyze difference of morphology (Bone/PedCAT) based FC and Force/Pressure (Pedograph

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Xu, Tianfang. "PID control and simulation of moving mass quadcopter UAV." Journal of Physics: Conference Series 2489, no. 1 (2023): 012015. http://dx.doi.org/10.1088/1742-6596/2489/1/012015.

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Abstract Based on the quadrotor drones we see today, in this paper, a mass center control mechanism installed on the body is proposed to control the flying attitude of the UAV. The moving mass control technology changes the position of the center of mass by moving the position of the mass block of the system. The technology is used in a wide range of aircraft, from drones to gravity satellites. The moving mass center mechanism mentioned in this paper is composed of three sliding blocks that can slide along the spatial axes and are controlled by a linear motor. The linear motor controls the sli

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15

Zhou, Yong, Xinyuan Zhang, Zhenzhen Yu, Dingena Schott, and Gabriel Lodewijks. "An improved zero vibration method and parameter sensitivity analysis for the swing control of bridge-type grab ship unloader." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 14 (2015): 2463–72. http://dx.doi.org/10.1177/0954406215597957.

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This paper presents an improved zero vibration method for the swing control of bridge-type grab ship unloader. With the method, the concepts of equivalent frequency and the equivalent damping ratio are proposed to cope with the changeable length of rope, and the optimal path planning is considered to avoid collision and improve efficiency. Numerical simulation results of a case study indicate that the maximum residual swing angle of the grab can be limited to a small range to ensure safety using the improved zero vibration method, whereas the traditional zero vibration method with average freq

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16

Uhen, Mark D. "An evaluation of clade-shape statistics using simulations and extinct families of mammals." Paleobiology 22, no. 1 (1996): 8–22. http://dx.doi.org/10.1017/s0094837300015980.

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The use of clade-shape statistics, particularly center of gravity, on paraphyletic groups has been questioned since the introduction of these descriptive statistics. In addition, previous studies have found that early-arising groups of organisms are bottom-heavy in center of gravity relative to later-arising groups, leading to macroevolutionary hypotheses about the nature of diversification. Paraphyletic groups have been asserted to be inherently bottom-heavy because of preconceived ideas as to how paraphyletic group formation affects center of gravity. In turn, early-arising groups of organis

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17

Fukuoka, Yasuhiro, Kazuyuki Oshino, and Ahmad Najmuddin Ibrahim. "Negotiating Uneven Terrain by a Simple Teleoperated Tracked Vehicle with Internally Movable Center of Gravity." Applied Sciences 12, no. 1 (2022): 525. http://dx.doi.org/10.3390/app12010525.

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We propose a mechanical design for a simple teleoperated unmanned ground vehicle (UGV) to negotiate uneven terrain. UGVs are typically classified into legged, legged-wheeled, wheeled, and tanked forms. Legged vehicles can significantly shift their center of gravity (COG) by positioning their multi-articulated legs at appropriate trajectories, stepping over a high obstacle. To realize a COG movable mechanism with a small number of joints, a number of UGVs have been developed that can shift their COG by moving a mass at a high position above the body. However, these tend to pose a risk of overtu

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18

Song, Seung-heon, Su-Kyoung Lee, and Su-Hong Ahn. "The effect of kinesio taping on joint range of motion and balance in total knee replacement patients." Journal of Exercise Rehabilitation 20, no. 4 (2024): 131–36. http://dx.doi.org/10.12965/jer.2442254.127.

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We adopted a within-subjects quasi-experimental approach to assess the impact of kinesio taping (KT) on joint range of motion (ROM), static balance, and dynamic balance. The research subjects were 15 patients who had, within the previous 3 weeks, undergone total knee replace-ment (TKR) by an orthopedic surgeon in 2022. We measured the ROM, static balance, and dynamic balance of the knee joint before and after applying KT. We then compared the pre- and post-tape measurements to assess the effects of KT on joint function and balance. The ROM of the knee joint was measured using a goniometer in t

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Kozlov, Victor G., and Stanislav V. Subbotin. "Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid." Advances in Acoustics and Vibration 2014 (March 16, 2014): 1–6. http://dx.doi.org/10.1155/2014/608058.

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The dynamics of a light sphere in a quickly rotating inclined cylinder filled with liquid under transversal vibrations is experimentally investigated. Due to inertial oscillations of the sphere relative to the cavity, its rotation velocity differs from the cavity one. The intensification of the lagging motion of a sphere and the excitation of the outstripping differential rotation are possible under vibrations. It occurs in the resonant areas where the frequency of vibrations coincides with the fundamental frequency of the system. The position of the sphere in the center of the cylinder could

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20

Cortes Kandler, Mariana. "Acoustic characterization of the Costa Rican Non-Standard Trills." Journal of the Acoustical Society of America 151, no. 4 (2022): A44. http://dx.doi.org/10.1121/10.0010603.

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This study characterizes the Costa Rican Spanish trill realizations acoustically, identifies the number of variants, and determines if they are acoustically distinguishable. Costa Rican trills typically lack vibration of the tongue tip and are thus categorized as ‘non-canonical’ compared to the normative rolled trill. Only impressionistic descriptions have been provided, posing challenges to comparisons across studies and dialects. Using Audacity, 18 speakers (9 female, M = 37.4) recorded their productions of 72 tokens containing the trill in word-initial/medial position and in stressed/unstre

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Zou, Jiasheng, Tijing Cai, and Shiliang Zhao. "Gravity-Aided Navigation Underwater Positioning Confidence Study Based on Bayesian Estimation of the Interquartile Range Method." Remote Sensing 17, no. 13 (2025): 2137. https://doi.org/10.3390/rs17132137.

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In this study, we improve the matching accuracy of underwater gravity-matching navigation and use this method to further analyze the confidence of the matching accuracy. An interquartile range (IQR)-matching approach based on Bayesian estimation, referred to as BEIQR, is proposed in this study. The method uses the correlation of the Terrain Contour Matching (TERCOM) algorithm as the a priori estimation and calculates the probability weights of the points to be matched by Bayesian a posteriori probability estimation. Additionally, it analyzes the distribution of the to-be-matched points to obta

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Self, Brian P., Anita M. Bagley, Teresa L. Triplett, and Lonnie E. Paulos. "Functional Biomechanical Analysis of the Pilates-Based Reformer during Demi-Plié Movements." Journal of Applied Biomechanics 12, no. 3 (1996): 326–37. http://dx.doi.org/10.1123/jab.12.3.326.

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The Pilates-based reformer is used by dancers for training and for injury rehabilitation. Knee kinematics and applied forces during demi-plié in fifth and in first positions were analyzed while dancers performed the motions (a) standing, (b) on the reformer equipped with two springs, and (c) on the reformer equipped with four springs. The highest forces, normalized to body weight, were obtained for the standing demi-plié, while the largest knee flexion angles occurred on the reformer with four springs. Greater range of motion was achieved in first position than in fifth, and females exhibited

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23

Gao, Hong, and Zhiheng Wang. "Hydrodynamic Response Analysis and Wave Energy Absorption of Wave Energy Converters in Regular Waves." Marine Technology Society Journal 51, no. 1 (2017): 64–74. http://dx.doi.org/10.4031/mtsj.51.1.7.

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AbstractThe hydrodynamic response and the energy capture analysis of wave energy converters (WECs) with three degrees of freedom are conducted using a frequency domain approach. Considering the coupled hydrodynamic coefficients between surge and pitch, motion responses in surge, heave, and pitch are solved for the WECs. The power take-off (PTO) damping is taken as a linear function of the velocity. The power absorption and the absorption efficiency in surge, heave, and pitch are analyzed and compared. The effects of the geometry, diameter, draft, center of gravity position, and PTO damping on

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Trimulyono, Andi, Tuswan Tuswan, Haidar Farros Mawarizt Taqi, et al. "Numerical Investigations of Deckhouse Height to the Self-Righting Moment of the Patrol Boat." Designs 8, no. 5 (2024): 86. http://dx.doi.org/10.3390/designs8050086.

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The design of patrol boats, especially in Indonesian waters with extreme sea conditions, requires good stability capabilities and self-righting moments. These conditions require patrol boats to have anti-capsized capabilities where, with these capabilities, the patrol boat can return to an upright position at extreme heeling angles. This study investigates how changing the center of gravity (CoG) due to the deckhouse height factor improves self-righting moment capabilities. Four different deckhouse heights are examined to find the optimal self-righting roll moment, with a deckhouse height in t

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25

Borka, Duško, Vesna Borka Jovanović, Salvatore Capozziello, Alexander F. Zakharov, and Predrag Jovanović. "Estimating the Parameters of Extended Gravity Theories with the Schwarzschild Precession of S2 Star." Universe 7, no. 11 (2021): 407. http://dx.doi.org/10.3390/universe7110407.

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After giving a short overview of previous results on constraining of Extended Gravity by stellar orbits, we discuss the Schwarzschild orbital precession of S2 star assuming the congruence with predictions of General Relativity (GR). At the moment, the S2 star trajectory is remarkably fitted with the first post-Newtonian approximation of GR. In particular, both Keck and VLT (GRAVITY) teams declared that the gravitational redshift near its pericenter passage for the S2 star orbit corresponds to theoretical estimates found with the first post-Newtonian (pN) approximation. In 2020, the GRAVITY Col

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Krawczyk-Suszek, Marlena, Blanka Martowska, and Rafał Sapuła. "Analysis of the Stability of the Body in a Standing Position When Shooting at a Stationary Target―A Randomized Controlled Trial." Sensors 22, no. 1 (2022): 368. http://dx.doi.org/10.3390/s22010368.

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Postural stability of the body depends on many factors. One of them is physical activity. It is especially important in the case of sports or professional work, which combine mobility with the accuracy of a shot in a standing position. The smaller the body fatigue, the more accurate the shot. The aim of the study was the assessment of the impact of physical effort on the center of gravity deflection and length of the COP (center of pressure) path, as well as the reaction of ground forces in people who do not engage in systematic physical activity. The study group included 139 people (23.1 ± 5.

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Liu, Jiafu, and Naigang Cui. "Rigid–flexible coupled dynamics analysis for solar sails." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 1 (2017): 324–40. http://dx.doi.org/10.1177/0954410017730091.

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The coupled orbit, attitude, and structural dynamics are established for the sailcraft with sliding mass, which is modeled as the Euler beam and merely experiences the pitch motion. The von Karman’s nonlinear strain–displacement relation and Kelvin–Voigt model are adopted to consider the geometric nonlinearity and damping of the structure, respectively. The torques generated by the gravity gradient of the two-body sailcraft, the center-of-mass (cm) and center-of-pressure (cp) offset, the motion of the sliding mass, and the coupled attitude-vibration motion are deduced in detail, respectively.

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GOROSHKO, Аndrii, Ilona DRACH, and Vitalii TKACHUK. "INFLUENCE OF CURRENT IMBALANCES AND CENTER POSITION HARDNESS ON VIBROACTIVITY OF HORIZONTAL DRUM MACHINES." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 299, no. 4 (2021): 89–94. http://dx.doi.org/10.31891/2307-5732-2021-299-4-89-94.

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The issues of reducing the vibration caused by rotating rotors at the frequency of the first rotor harmonic (so-called rotor vibration) are among the most important in the design, manufacture and operation of almost all types of modern rotary machines. The washing machine as an object of study of the dynamics and reduction of vibration and noise is of particular interest due to the constant presence of randomly located and wandering imbalance of laundry in the drum and low requirements for accuracy of its manufacture and assembly of parts and assemblies. A mathematical model of oscillations of

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GOROSHKO, Аndrii, Ilona DRACH, and Vitalii TKACHUK. "INFLUENCE OF INSTANT IMBALANCE AND POSITION OF HARDNESS CENTER ON VIBROACTIVITY OF HORIZONTAL DRUM MACHINES." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (2021): 105–11. http://dx.doi.org/10.31891/2307-5732-2021-297-3-105-111.

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The issues of reducing the vibration caused by rotating rotors at the frequency of the first rotor harmonic (so-called rotor vibration) are among the most important in the design, manufacture and operation of almost all types of modern rotary machines. The washing machine as an object of study of the dynamics and reduction of vibration and noise is of particular interest due to the constant presence of randomly located and wandering imbalance of laundry in the drum and low requirements for accuracy of its manufacture and assembly of parts and assemblies. A mathematical model of oscillations of

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Zhou, H., Z. Fang, J. Liu та Y. Zhou. "Design and simulation of a cylindrical μRWELL inner tracker for the experiment at the Super Tau-Charm Facility". Journal of Instrumentation 18, № 06 (2023): P06015. http://dx.doi.org/10.1088/1748-0221/18/06/p06015.

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Abstract The Super Tau-Charm Facility (STCF) is a future electron-positron collider operating in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035 cm-2s-1. A high-performance detector is required for the STCF experiment to meet the STCF physics goals. A low-material cylindrical inner tracker based on the micro-resistive well detector (μRWELL) is proposed for the STCF experiment. In this paper, the design of the μRWELL inner tracker is presented. A good balance between material budget, structural strength, and detector performance is achieved in the design where

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Chen, Jing. "Biomechanics Analysis of Shooting in Basketball." Applied Mechanics and Materials 685 (October 2014): 477–80. http://dx.doi.org/10.4028/www.scientific.net/amm.685.477.

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By literature review, expert interview, and biomechanical methods, in this study using 3D film analyzing system to reveal the kinematics parameters of shooting in basketball players. The purpose of this study is to investigate the characteristics of joint angles at release and reveal the reason for improving the hit rate in shooting. Ten collegiate level basketball players in this study. After digitizing the data, this study come to the following conclusion that (1) when the basketball players flex their left and right knee joints at about 131.5o and 97.6o respectively at the lowest center of

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Zhao, Hongxing, Chunli Yang, and Chenglei Fan. "Research of a Novel Non-Axisymmetric Side-Compressed Variable Polarity Plasma Arc and Its Pressure Distribution Characteristics." Metals 14, no. 2 (2024): 231. http://dx.doi.org/10.3390/met14020231.

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In the keyhole variable polarity plasma arc weldng (VPPAW) process at horizontal position, the metal driven by gravity gathered on one side of the molten pool, and the weld formation is difficult, especially for thick workpiece welding. A specially designed experiment to analyze the influence of gravity on weld formation and a novel nozzle structure with side holes was proposed to generate a novel non-axisymmetric side-compressed plasma arc and redistribute arc pressure. The arc shape and pressure distribution were studied, and the ratio of difference for arc pressure in different directions R

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Chovcha, Iryna. "TO THE CHOICE OF COMPOSITION AND MASS PARAMETERS OF TRAILERS FOR CARS." Avtoshliakhovyk Ukrayiny 4, no. 281 (2024): 14–20. https://doi.org/10.33868/0365-8392-2022-4-272-14-20.

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The development of small and medium-sized businesses in Ukraine has led to an increase in the demand for trailers used in conjunction with cars. These are, first of all, trailers of categories O1 and O2. Category O1 trailers include, as a rule, trailers with a total mass of up to 0.75 tons, and category O2 trailers include single- and two-axle trailers with centrally located axles with a total mass of 0.75 to 3.5 tons. M1, first of all, is connected with the need of their owners for the constant transportation of oversized cargo of small carrying capacity or for the transportation of boats, bo

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Belyaev, Alexander, Vladimir Orobinsky, Arkady Khimchenko, Tatiana Trishina, and Pavel Sheredekin. "DETERMINATION OF THE POSITION OF THE INSTANTANEOUS CENTER OF ROTATION AND THE TURNING RADIUS WHEN CHANGING THE TRACK WIDTH OF A WHEELED TRACTOR." SCIENCE IN THE CENTRAL RUSSIA, no. 3 (June 28, 2024): 73–84. http://dx.doi.org/10.35887/2305-2538-2024-3-73-84.

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Changing the tractor track width significantly expands its functionality and improves its performance properties, but at the same time the rolling conditions of the wheels are significantly disrupted. The relationship between the angles of rotation of the inner and outer steered wheels, which determine the correspondence of each of its values to the condition of ideal rotation, ensuring free rolling of the wheels without slipping, changes when adjusting the track width of a wheeled tractor. Kinematic analysis of the curvilinear movement of the machine when changing the track width allows you t

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Compton, Roger H. "Resistance of a Systematic Series of Semiplaning Transom-Stern Hulls." Marine Technology and SNAME News 23, no. 04 (1986): 345–70. http://dx.doi.org/10.5957/mt1.1986.23.4.345.

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YP 676 underway The results of a systematic series of small (5 ft) models of hulls typical of coastal patrol, training, or recreational powerboats are presented and discussed. Hull form parameters studied include length-to-beam ratio, displacement-length ratio, longitudinal position of the center of gravity and section shape (hard chine or round bilge). The effects of these parameters on the calm-water resistance and running attitude (sinkage and trim) over a range of speeds corresponding to waterline length Froude numbers from 0.10 to 0.60 were investigated in the 120-ft towing tank at the U.

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Zhou, Han, Pengyao Yu, Xiang Jin, and Tianlin Wang. "Analysis of the In Situ Steering Motion Characteristics and Sensitivity of Disc-Type Underwater Gliders." Journal of Marine Science and Engineering 8, no. 9 (2020): 663. http://dx.doi.org/10.3390/jmse8090663.

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A disc-type underwater glider (DTUG) has a highly symmetrical shape and is characterized by omnidirectional characteristics and high maneuverability in small bodies of water. To further explore the disc shape’s advantages and characteristics in steering motion, DTUG motion was simulated by Matlab/Simulink. Based on the structural characteristics of DTUG, the motion control equations were established. The simulation of DTUG’s steering motion is carried out and compared with a previous DTUG (LUNA). The sensitivity analysis and Lyapunov stability analysis were also conducted. The results showed t

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Retscher, Guenther, Jonathan Kleine, and Lisa Whitemore. "Trilateration Approaches for Indoor Wi-Fi Positioning." E3S Web of Conferences 94 (2019): 02002. http://dx.doi.org/10.1051/e3sconf/20199402002.

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In smartphones several sensors and receivers are embedded which enable positioning in Location-based Services and other navigation applications. They include GNSS receivers and Wireless Fidelity (Wi-Fi) cards as well as inertial sensors, such as accelerometers, gyroscope and magnetometer. In this paper, indoor Wi-Fi positioning is studied based on trilateration. Three methods are investigated which are a resection, a calculation of the center of gravity point and a differential approach. The first approach is a commonly employed resection using the ranges to the Wi-Fi Access Points (APs) as ra

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Thornhill, Eric, Brian Veitch, and Neil Bose. "Dynamic Instability of a High-Speed Planing Boat Model." Marine Technology and SNAME News 37, no. 03 (2000): 146–52. http://dx.doi.org/10.5957/mt1.2000.37.3.146.

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A series of bare-hull resistance and self-propulsion tests were carried out on a 1/8 scale model of a 11.8 m long, waterjet-propelled planing hull in the clear water towing tank at the National Research Council of Canada's Institute for Marine Dynamics. The bare-hull resistance tests, performed with the waterjet inlets closed, spanned a range of eight model velocities and nine ballast conditions consisting of three displacements each with three positions of the longitudinal center of gravity. The hull was then fitted with two model waterjet thrusters and tested over the same speeds and ballast

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Shi, Xiaohua, Hao Lu, and Ziming Chen. "Design and Analysis of an Intelligent Toilet Wheelchair Based on Planar 2DOF Parallel Mechanism with Coupling Branch Chains." Sensors 21, no. 8 (2021): 2677. http://dx.doi.org/10.3390/s21082677.

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Due to the fixed size of the structure or the possibility of only simple manual adjustment, the traditional toilet wheelchair cannot easily be adapted to the size of the user or the toilet. In this paper, a planar two-degree-of-freedom parallel mechanism with coupling branch chains is proposed to enable both seat height adjustment and body posture adjustment of a toilet chair, solving the problems of posture adaptability between the user and the machine, and height matching in the process of using the wheelchair-assisted toilet. The model of the parallel mechanism was designed after analyzing

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Ottaviani, Marco, Luca Giammichele, and Renato Ricci. "Design, Assembly and Testing of a Mobile Laboratory Based on a VTOL Scale Motorglider." Tecnica Italiana-Italian Journal of Engineering Science 65, no. 2-4 (2021): 414–21. http://dx.doi.org/10.18280/ti-ijes.652-440.

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The objective of this paper is to explain the design steps and performance analysis of a vertical take-off and landing (VTOL) unmanned air vehicle (UAV) based on a Pilatus B4 glider scale model. Energy consumption, forces and thrust analyses are carry out to determinate the perfect match between low take-off weight and high aerodynamic performance. As a first approach a complete analysis of glider aerodynamic performances are settle to understand and design a proper support for VTOL conversion. Longitudinal static stability is fulfilled by evaluating the center of gravity location with respect

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Agåker, Marcus, Carl-Johan Englund, Peter Sjöblom, Nial Wassdahl, Pierre Fredriksson, and Conny Såthe. "An ultra-high-stability four-axis ultra-high-vacuum sample manipulator." Journal of Synchrotron Radiation 28, no. 4 (2021): 1059–68. http://dx.doi.org/10.1107/s1600577521004859.

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A report on a four-axis ultra-high-stability manipulator developed for use at the Veritas and Species RIXS beamlines at MAX IV Laboratory, Lund, Sweden, is presented. The manipulator consists of a compact, light-weight X–Y table with a stiffened Z tower carrying a platform with a rotary seal to which a manipulator rod holding the sample can be attached. Its design parameters have been optimized to achieve high eigen-frequencies via a light-weight yet stiff construction, to absorb forces without deformations, provide a low center of gravity, and have a compact footprint without compromising acc

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Nayak, Sabyasachi, Binu M. Sekhar, Neeraj Kumar Tripathy, and Vijay Vishnu Joshi. "Localization of center of gravity of helmet systems in the human anatomical frame using 3D laser scanners." Indian Journal of Aerospace Medicine 66 (June 1, 2023): 71–78. http://dx.doi.org/10.25259/ijasm_7_2022.

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Introduction: An accurate assessment of the Center of Gravity (CoG) and mass properties of aircrew helmets and helmet-mounted devices is an essential requirement to predict neck injury potential. Conventionally, trifilar pendulum method is used for the assessment of CoG shift and calculation of force moment and mass moment. In this study, a new procedure is described to obtain a more precise measurement of the CoG of the helmet as well as the combined head and helmet system. Material and Methods: Measurement of the helmet mass and CoG properties was done using a trifilar pendulum and the geome

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Yuan, Mengli, Bin Yang, Xin Li, Annan Li, Feng Gao, and Mengqi Ge. "Dynamic Balance Simulation and Optimization of Electric Vehicle Scroll Compressor Rotor System." Applied Sciences 14, no. 12 (2024): 5024. http://dx.doi.org/10.3390/app14125024.

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In order to solve the problem of imbalance of internal forces in the system caused by the gravity force of the eccentric wheel and the orbiting scroll close to the drive bearing and the rotational inertia force during the operation of the electric scroll compressor, a dynamic model of the rotor system of the scroll compressor that takes into account the effect of the gas force was established using the multibody dynamics software ADAMS/View 2020. Dynamic simulation analysis of the rotor system is carried out, focusing on the force of the drive bearing; a parametric optimization method is adopt

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Anosova, J., K. Tanikawa, J. Colin, L. Kiseleva, and P. Eggleton. "Escape Velocities from Unstable Triple Stars." Symposium - International Astronomical Union 169 (1996): 527–28. http://dx.doi.org/10.1017/s0074180900230283.

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In order to investigate a possible origin for stars with high peculiar velocities in the thick disc of our Galaxy, the dynamical evolution of 16 000 three-dimensional triple systems which consist of a binary with equal or comparable masses of componentsM1andM2and a low-mass third bodyM3is considered. We examine an extensive range of initial conditions with positions of the bodyM3randomly distributed around and inside the binary orbit.M3was given the initial radial velocityV0with respect to the center of inertia of the binary. The following dynamical system of units is used in this work: the un

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Sanders, Ross H., and Barry D. Wilson. "Angular Momentum Requirements of the Twisting and Nontwisting Forward 1 1/2 Somersault Dive." International Journal of Sport Biomechanics 3, no. 1 (1987): 47–62. http://dx.doi.org/10.1123/ijsb.3.1.47.

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This study investigated the in-flight rotation of elite 3m springboard divers by determining the angular momentum requirement about the transverse axis through the divers center of gravity (somersault axis) required to perform a forward 1 1/2 somersault with and without twist. Three elite male divers competing in the 1982 Commonwealth Games were filmed using high-speed cinematography while performing the forward 1 1/2 somersault in the pike position and the forward 1 1/2 somersault with one twist in a free position. The film was digitized to provide a kinematic description of each dive. An inc

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Zhao, Xiangling, Yun Dong, and Lei Zuo. "A Combinatorial Optimization Approach for Air Cargo Palletization and Aircraft Loading." Mathematics 11, no. 13 (2023): 2798. http://dx.doi.org/10.3390/math11132798.

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The current air cargo loading plan handles the Air Cargo Palletization Problem (ACPP) and the Aircraft Weight and Balance Problem (WBP) separately, which has an impact on the optimization of the payload and the aircraft’s center of gravity (CG). Thanks to improvements in computer processing power, the joint combinatorial optimization of ACPP and WBP is now feasible. Three integer linear programming models are proposed: a Bi-objective Optimization Model (BOM), a Combinatorial Optimization Model (COM), and an Improved Combinatorial Optimization Model (IOM). The objectives of the models are the m

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Wang, Lixin, Kun Yang, Peng Zhao, and Ting Yue. "Aircraft Configuration Parameter Boundaries Based on Closed-Loop Flying Qualities Requirements." Aerospace 8, no. 12 (2021): 360. http://dx.doi.org/10.3390/aerospace8120360.

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For aircraft employing the fly-by-wire technique, the closed-loop dynamic characteristics are determined by both the configuration design and the flight control system. As the capacity of the control system has certain limitations, the configuration parameters are also constrained by the requirements of the closed-loop flying qualities. This paper presents an aircraft configuration parameter boundaries determination method based on closed-loop flying qualities requirements independent of the actual flight control law design, mainly aiming at the parameters that affect the stability and control

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Chow, Tong-Hsien, and Yu-Ling Lee. "Plantar load distribution with centers of gravity balance and rearfoot posture in daily lives of Taiwanese college elite table tennis players: a cross-sectional study." PeerJ 12 (March 26, 2024): e17173. http://dx.doi.org/10.7717/peerj.17173.

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Background Table tennis is an asymmetric sport involving the powerful forward swing of the upper limbs depends on the solid support of the lower limbs. The foot drive really affects the weight balance and stroke accuracy even though the distance and momentum of the lower limb displacement are limited within a limited range. Given that previous research on table tennis has typically focused on the footwork and stroke performance of professional players, the study aimed to investigate the daily static and dynamic plantar load distribution as well as the centers of gravity balance and rearfoot po

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OZHERELYEV, VIKTOR N. "PECULIARITIES OF USING THE VERTICAL ROTARY CULTIVATOR FOR INTER-ROW SOIL TILLAGE OF RASPBERRY PLANTINGS [." Agricultural engineering, no. 5 (2021): 20–24. http://dx.doi.org/10.26897/2687-1149-2021-5-20-24.

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When tilling the soil with a vertical-rotary limiter of the raspberry row width, rotating knives perform its transverse transferring. In this regard, it is advisable to fi nd the means to control the process. The study revealed the infl uence of the design parameters of the raspberry row width limiter on the pattern and degree of the lateral displacement of the cross-section of the cultivated soil strip. The authors assessed the intensity of the process of transverse soil redistribution by comparing the positions of the gravity centers of the treated strip cross-section before and after the ti

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Retscher, Guenther, Jonathan Kleine, and Lisa Whitemore. "Trilateration approaches for seamless out-/indoor GNSS and Wi-Fi smartphone positioning." Journal of Applied Geodesy 13, no. 1 (2019): 47–61. http://dx.doi.org/10.1515/jag-2018-0022.

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Abstract More and more sensors and receivers are found nowadays in smartphones which can enable and improve positioning for Location-based Services and other navigation applications. Apart from inertial sensors, such as accelerometers, gyroscope and magnetometer, receivers for Wireless Fidelity (Wi-Fi) and GNSS signals can be employed for positioning of a mobile user. In this study, three trilateration methods for Wi-Fi positioning are investigated whereby the influence of the derivation of the relationship between the received signal strength (RSS) and the range to an Access Points (AP) are a

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