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Open access

Zhitao Xiao, Lei Pei, Fang Zhang, Ying Sun, Lei Geng, Jun Wu and Jun Tong

Whitcomb, J. D. (2006). Analysis of stress concentrations in 2×2 braided composites. Journal of composite materials, 40(6), 533-546. [11] Wan, Z., Li, J. (2006). Braided angle measurement technique for three-dimensional braided composite material preform using mathematical morphology and image texture. AUTEX Research Journal, 6(1), 30-39. [12] Gong, L., and Wan, Z. (2006). Automatic measurement technology on braided pitch length of three-dimensional braided composite material preform. Computer Measurement & Control (in Chinese), 14(6), 730-733. [13] Wan

Open access

Daniel Jara, Enrique Ortega, Miguel-Ángel Gómez and Pilar Sainz de Baranda

Introduction Small-sided games (SSGs) are currently widely used as methods of training in soccer. Hill-Haas et al. (2011) define this method of training as a technique grounded in the use of preparation matches with modifications based on the reduction of pitch size, typically using adapted rules and fewer players than in real-life competition scenarios. Based on the concept that each field has dimensions of length and width, the technique determines three types of small fields: (1) square, (2) longer than wider, and (3) wider than longer. SSGs are used

Open access

David Casamichana, Paul S Bradley and Julen Castellano

Introduction Small-sided games (SSGs) are now a common feature of soccer training ( Ford et al., 2010 ) as they enable a greater understanding of which indices impact players’ responses ( Ade et al., 2014 ). The SSG playing area is a structural element that is modified most frequently when planning training drills. Typical modifications include variations in the length and width of the pitch and the relative space per player (Casamichana and Castellano, 2010) or maintaining the same pitch dimension but dividing it into different areas ( Gonçalves et al., 2017

Open access

Yildirim Vebil

Vibration-Free Mountings. Philips Research Reports 1949 (4), 49-80. [7] C. J. Ancker, J. N. Goodier. Pitch and Curvature Corrections for Helical Springs. J Appl Mech 1958 (25), 466-470. [8] C. J. Ancker, J. N. Goodier. Theory of Pitch and Curvature Corrections for the Helical Springs-I (Tension). Trans ASME- J Appl Mech 1958 (25), 471-483. [9] C. J. Ancker, J. N. Goodier. Theory of Pitch and Curvature Corrections for the Helical Springs-II (Torsion). Trans ASME- J Appl Mech 1958 (25), 484-495. [10] A. M. Wahl

Open access

J. Knapczyk and G. Tora

Abstract

A novel parallel manipulator with 3 legs (2 actuated by linear actuators and one supporting pillar),which is applied in a wheel loader driving simulator, is proposed in this paper. The roll angle and the pitch angle of the platform are derived in closed-form of functions of the variable lengths of two actuators. The linear velocity and acceleration of the selected point and angular velocity of the moving platform are determined and compared with measurement results obtained in the respective point and in the body of the wheel loader. The differences between the desired and actual actuator displacements are used as feedback to compute how much force to send to the actuators as some function of the servo error. A numerical example with a proposed mechanism as a driving simulator is presented

Open access

Mohd. Reyaz-Ur-Rahim, P. K. Bharti and Afaque Umer

Abstract

With the help of finite element analysis, this research paper deals with the energy absorption and collapse behavior with different corrugated section geometries of hollow tubes made of aluminum alloy 6060-T4. Literature available experimental data were used to validate the numerical models of the structures investigated. Based on the results available for symmetric crushing of circular tubes, models were developed to investigate corrugated thin-walled structures behavior. To study the collapse mechanism and energy absorbing ability in axial compression, the simulation was carried in ABAQUS /EXPLICIT code. In the simulation part, specimens were prepared and axially crushed to one-fourth length of the tube and the energy diagram of crushing force versus axial displacement is shown. The effect of various parameters such as pitch, mean diameter, corrugation, amplitude, the thickness is demonstrated with the help of diagrams. The overall result shows that the corrugated section geometry could be a good alternative to the conventional tubes.

Open access

Tomasz Ciszewski

References Bolinger, Dwight. 1958. A theory of pitch accent in English. Word 14: 109-149. Cutler, Anne, Dahan Delphine and van Donsellar, Wilma. 1997. Prosody in the comprehension of spoken language: a literature review. Language and Speech 40: 141-202. Fry, Denis B. 1955. Duration and intensity as acoustic correlates of linguistic stress. JASA 27: 765-768. Fry, Denis B. 1958. Experiments in the perception of stress. Language and Speech 1: 126-152. Gussenhoven, Carlos. 2007

Open access

Felipe Arruda Moura, Juliana Exel Santana, Nathália Arnosti Vieira, Paulo Roberto Pereira Santiago and Sergio Augusto Cunha

of box plots. Am Stat, 1978; 32: 12-16 Miller RH, Chang R, Baird JL, Van Emmerik REA, Hamill J. Variability in kinematic coupling assessed by vector coding and continuous relative phase. Journal of biomechanics, 2010; 43(13): 2554-2560 Moura FA, Martins LE, Anido RO, Ruffino PR, Barros RM, Cunha SA. A spectral analysis of team dynamics and tactics in Brazilian football. J Sports Sci, 2013; 31(14): 1568-1577 Moura FA, Martins LEB, Anido RO, Barros RML, Cunha SA. Quantitative analysis of Brazilian football players' organisation on the pitch

Open access

K. Fujimoto, N. Hamada and W. Kasprzak

). P. Dognin, "A bandpass transform for speaker normalization", Ph. D. Dissertation , University of Pittsburgh, Pittsburgh, 2003. H. Traunmüller and F. Lacerda, "Perceptual relativity in identification of two-formant vowels", Speech Communication 6, 143-157 (1987). E. Eide and H. Gish, "A parametric approach to vocal tract length normalization", Proc. ICASSP 1, 346-348 (1996). J. Laroche and M. Dolson, "New phase-vocoder techniques for real-time pitch shifting, chorusing, harmonizing

Open access

Dong Jin Kim, Sun Young Kim, Young Jun You, Key Pyo Rhee, Seong Hwan Kim and Yeon Gyu Kim

ABSTRACT

High-speed vessels require good resistance and seakeeping performance for safe operations in rough seas. The resistance and seakeeping performance of high-speed vessels varies significantly depending on their hull forms. In this study, three planing hulls that have almost the same displacement and principal dimension are designed and the hydrodynamic characteristics of those hulls are estimated by high-speed model tests. All model ships are deep-V type planing hulls. The bows of no.2 and no.3 model ships are designed to be advantageous for wave-piercing in rough water. No.2 and no.3 model ships have concave and straight forebody cross-sections, respectively. And length-to-beam ratios of no.2 and no.3 models are larger than that of no.1 model. In calm water tests, running attitude and resistance of model ships are measured at various speeds. And motion tests in regular waves are performed to measure the heave and pitch motion responses of the model ships. The required power of no.1 (VPS) model is smallest, but its vertical motion amplitudes in waves are the largest. No.2 (VWC) model shows the smallest motion amplitudes in waves, but needs the greatest power at high speed. The resistance and seakeeping performance of no.3 (VWS) model ship are the middle of three model ships, respectively. And in regular waves, no.1 model ship experiences ‘fly over’ phenomena around its resonant frequency. Vertical accelerations at specific locations such as F.P., center of gravity of model ships are measured at their resonant frequency. It is necessary to measure accelerations by accelerometers or other devices in model tests for the accurate prediction of vertical accelerations in real ships.