Different Techniques Comparison in Biomechanical Analysis of Ping Pong

2012 ◽  
Vol 166-169 ◽  
pp. 3106-3109 ◽  
Author(s):  
Bi Jian Mao
Keyword(s):  
High Speed ◽  
Biomechanical Study ◽  
Biomechanical Analysis ◽  
Table Tennis ◽  
Core Technology ◽  
Ping Pong ◽  
The World ◽  
Ball Contact ◽  
Speed Parameter ◽  
Male Subjects

Ping Pong has been considered as one of the most popular sports in the world. Fast break and curving ball technology is this game’s core technology, it will be very important to deeply understand this through biomechanical study. In this research, we based on fast break and curving ball features of kinematic to reveal the table tennis forehand techniques. High speed motion analysis was recorded from eight male subjects. The action was divided into three major phases: back swing, attack and follow through. At the end of back swing stage, break and curl technologies, the speed parameter shows some differences. While the fastest speed in ball contact frame, the speed of curling ball was significantly higher than the fast break. Further study could be carried out in detailing analysis at sub-stage of the action for integral considering.

Biomechanical Analysis of Two Techniques Performed in Table Tennis

2012 ◽  
Vol 182-183 ◽  
pp. 1658-1661 ◽  
Author(s):  
Bi Jian Mao
Keyword(s):  
19Th Century ◽  
Motion Capture ◽  
Biomechanical Analysis ◽  
Motion Capture System ◽  
Table Tennis ◽  
Core Technology ◽  
Ball Contact ◽  
Speed Parameter ◽  
The 19Th Century ◽  
Peak Speed

Table tennis, as one of the most popular sports in China, has grown considerably since its developed in the 19th century in England. The biomechanics of the research methods in many sports has been widely used, for understanding of sports and technology and improve sports played an important role Fast break and curving ball technology is this game’s core technology. In this study, we based on fast break and curving ball features of kinematic to reveal the table tennis forehand techniques. Eight male volunteers were participated in this tests, the speed of the racket during the playing was recorded through Vicon Motion Capture System. The action was divided into three major phases: back swing, attack and follow through. At the end of back swing stage, break and curl technologies, the speed parameter shows some differences. While the peak speed in ball contact frame, the speed of curling ball was significantly higher than the fast break. Further study could be carried out in detailing analysis at sub-stage of the action for integral considering.

scholarly journals Biomechanical analysis of topspin techniques in table tennis games

MEDIKORA ◽  
2021 ◽  
Vol 20 (2) ◽  
pp. 125-133
Author(s):  
Aulia Gusdernawati ◽  
Widiyanto Widiyanto ◽  
Ahmad Nasrulloh
Keyword(s):  
Qualitative Research ◽  
Analysis Data ◽  
The Body ◽  
Biomechanical Analysis ◽  
Table Tennis ◽  
Male Athletes ◽  
Bending Angle ◽  
The World ◽  
The Right

Motion analysis in sports can help athletes and coaches as material for evaluating movement in improving movement and improving athlete performance with a predetermined training program. The purpose of this study was to analyze the motion of the topspin technique in table tennis. This research is a qualitative research by describing the results of the video analysis of the topspin technique movement which is accessed from youtube, then using the Kinovea application instrument. The subjects in this study were the top ranked players, which consisted of five of the best male athletes at the world level in the table tennis game. Based on the analysis data above, it was found that the average bending of the elbow at the ready position was 92.80, the swing position before hitting the ball was 142.40, when hitting the ball was 117.80, and after hitting the ball was 73.40. The results of the average elbow distance from the center point when the ready position is 68.728 cm, when the swing position before hitting the ball is 23.532 cm, when hitting the ball with a distance of 50.88 cm and during further motion 150.768 cm. The results of the analysis of the inclination angle of the body when the ready position is 161.60, when swinging the hand 152.60, when hitting the ball 150.60, and for further motion with a body inclination of 1660. The results of the analysis of the bending of the right leg when the position is 149.80, the position of swinging the right leg 125.40, and when the ball hits it forms an angle of 125.60 and when it continues to move 42.60. The average results of the analysis of the left leg bending angle when the ready position is 151.20, the swinging position with the left leg bending is 126.20, in the position of the ball hitting an angle of 130.40, and accompanied by a follow-up motion to form the left foot angle of 1460. The average foot distance when hitting the topspin, in the ready position is 186 cm, during the backswing the foot distance is 196.638 cm, and when hitting the ball is 198.81 cm, and accompanied by a follow-up motion of 195.886 cm. Biomechanical analysis of the topspin technique from several stages starting from the ready position to the advanced motion carried out by each athlete according to their respective body anatomy and following the position when hitting the ball.Analisis biomekanika teknik topspin pada permainan tenis mejaAbstrakAnalisis gerak pada olahraga dapat membantu atlet dan pelatih sebagai bahan evaluasi gerakan dalam memperbaiki gerakan dan meningkatkan performa atlet dengan program latihan yang telah ditentukan. Tujuan penelitian ini ialah menganalisis gerak teknik topspin dalam permainan tenis meja. Penelitian ini merupakan penelitian kualitatif dengan mendeskripsikan hasil analisis video gerakan teknik topspin yang diakses dari youtube, kemudian menggunakan instrumen aplikasi Kinovea. Subyek dalam penelitian ini men top ranked players yang berjumlah lima orang atlet putra terbaik ditingkat dunia pada permainan tenis meja. Berdasarkan dari data analisis diatas ditemukan nilai rerata tekukan siku pada saat posisi siap 92,80, posisi ayunan sebelum memukul bola 142,40, saat memukul bola 117,80, dan sesudah memukul bola sebesar 73,40. Hasil rerata jarak siku dari titik pusat saat posisi siap 68,728 cm, saat posisi ayunan sebelum memukul bola 23,532 cm, saat memukul bola dengan jarak 50,88 cm dan saat gerak lanjutan 150,768 cm. Hasil analisis sudut kecondongan tubuh saat posisi siap 161,60, saat mengayunkan tangan 152,60, saat memukul bola 150,60, dan untuk gerak lanjutan dengan kecondongan tubuh 1660. Hasil analisis tekukan kaki kanan saat posisi 149,80, posisi mengayunkan kaki kanan 125,40, dan saat perkenaan bola membentuk sudut 125,60 dan saat gerak lanjutan 42,60. Hasil rerata analisis sudut tekukan kaki kiri saat posisi siap 151,20, posisi mengayungkan tangan dengan tekukan kaki kiri 126,20, pada posisis perkenaan bola membentuk sudut 130,40, serta diiringi dengan gerak lanjutan membentuk sudut kaki kiri 1460. Hasil rerata jarak kaki saat melakukan pukulan topspin, pada posisi siap 186cm, saat backswing jarak kaki 196,638 cm, dan saat perkenaan bola 198,81 cm, serta di iringi gerak lanjutan 195,886 cm. Analisis biomekanik teknik topspin dari beberapa tahapan dimulai dari posisi siap hingga gerak lanjutan yang dilakukan masing-masing atlet sesuai anatomi tubuh masing-masing serta mengikuti posisi saat perkenaan bola.

The Poetry of Ping-Pong

2016 ◽  
Author(s):  
Steve Zeitlin
Keyword(s):  
Table Tennis ◽  
New Yorker ◽  
Ping Pong ◽  
The World ◽  
The New Yorker

In this chapter, the author looks at the poetry of Ping-Pong, his favorite sport. According to Marty Reisman, the game of Ping-Pong died in Bombay, India, in 1952. Reisman, nicknamed “The Needle,” was favored to win the World Table Tennis Championship that day. The author says he has always loved Ping-Pong because you can get into a rhythm, hit the ball back and forth across the net for hours, with any racquet, and simply talk. Ping-Pong, like poetry, is a players' sport, not ideal for spectators. Bob Mankoff, the cartoon editor of The New Yorker, claims that there is palpable humor in the game. With Ping-Pong, the author insists that we are all capable of attuning ourselves to the hidden life of sports, a relationship that is about kinesthesia and embodiment.

scholarly journals Czech and Polish Table Tennis Players of Jewish Origin in International Competition (1926-1957)

2011 ◽  
Vol 53 (1) ◽  
pp. 65-75
Author(s):  
Wiesław Pięta ◽  
Aleksandra Pięta
Keyword(s):  
Czech Republic ◽  
Minority Group ◽  
International Competition ◽  
Table Tennis ◽  
Tennis Players ◽  
Jewish Origin ◽  
Stage Of Development ◽  
Ping Pong ◽  
The World ◽  
World Champion

Czech and Polish Table Tennis Players of Jewish Origin in International Competition (1926-1957)The beginnings of the 18th century marked the birth of Jewish sport. The most famous athletes of those days were boxers, such as I. Bitton, S. Eklias, B. Aaron, D. Mendoga. Popular sports of this minority group included athletics, fencing and swimming. One of the first sport organizations was the gymnastic society Judische Turnverein Bar Kocha (Berlin - 1896).Ping-pong as a new game in Europe developed at the turn of the 20th century. Sport and organizational activities in England were covered by two associations: the Ping Pong Association and the Table Tennis Association; they differed, for example, in the regulations used for the game. In 1902, Czeski Sport (a Czech Sport magazine) and Kurier Warszawski (Warsaw's Courier magazine) published first information about this game. In Czech Republic, Ping-pong became popular as early as the first stage of development of this sport worldwide, in 1900-1907. This was confirmed by the Ping-pong clubs and sport competitions. In Poland, the first Ping-pong sections were established in the period 1925-1930. Czechs made their debut in the world championships in London (1926). Poles played for the first time as late as in the 8th world championships in Paris (1933). Competition for individual titles of Czech champions was started in 1927 (Prague) and in 1933 in Poland (Lviv).In the 1930s, Czechs employed an instructor of Jewish descent from Hungary, Istvan Kelen (world champion in the 1929 mixed games, studied in Prague). He contributed to the medal-winning success of Stanislaw Kolar at the world championships. Jewish players who made history in world table tennis included Trute Kleinowa (Makkabi Brno) - world champion in 1935-1937, who survived imprisonment in the Auschwitz-Birkenau Nazi concentration camp, Alojzy Ehrlich (Hasmonea Lwów), the three-time world vice-champion (1936, 1937, 1939), also survivor of Auschwitz-Birkenau, and Ivan Andreadis (Sparta Praga), nine-time world champion, who was interned during World War II (camp in Kleinstein near Krapkowice).Table tennis was a sport discipline that was successfully played by female and male players of Jewish origins. They made powerful representations of Austria, Hungary, Romania and Czech Republic and provided the foundation of organizationally strong national federations.

The Innovation Cluster «The Velvet Way» and Ukrainian Scientific and Technical Break into the World Market of Building of High-Speed Railways

2010 ◽  
Vol 6 (2) ◽  
pp. 69-86
Author(s):  
B.Ye. Paton ◽  
◽  
M.D. Kostyuk ◽  
S.I. Kuchuk-Yatsenko ◽  
O.A. Mazur ◽  
...  
Keyword(s):  
High Speed ◽  
World Market ◽  
Innovation Cluster ◽  
The World

scholarly journals WebRTC - Realtime Communication for the Open Web Platform

Queue ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 77-93
Author(s):  
Niklas Blum ◽  
Serge Lachapelle ◽  
Harald Alvestrand
Keyword(s):  
High Speed ◽  
Network Access ◽  
The Past ◽  
Human Contact ◽  
High Speed Network ◽  
The World ◽  
Web Platform

In this time of pandemic, the world has turned to Internet-based, RTC (realtime communication) as never before. The number of RTC products has, over the past decade, exploded in large part because of cheaper high-speed network access and more powerful devices, but also because of an open, royalty-free platform called WebRTC. WebRTC is growing from enabling useful experiences to being essential in allowing billions to continue their work and education, and keep vital human contact during a pandemic. The opportunities and impact that lie ahead for WebRTC are intriguing indeed.

scholarly journals Selective Laser Melting of Crack-Free High Density M2 High Speed Steel Parts by Baseplate Preheating

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Karolien Kempen ◽  
Bey Vrancken ◽  
Sam Buls ◽  
Lore Thijs ◽  
Jan Van Humbeeck ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
High Speed ◽  
Crack Formation ◽  
High Speed Steel ◽  
Thermal Gradients ◽  
Laser Melting ◽  
Mechanical And Physical Properties ◽  
The World ◽  
M2 High Speed Steel

Cracks and delamination, resulting from residual stresses, are a barrier in the world of additive manufacturing and selective laser melting (SLM) that prohibits the use of many metals in this field. By preheating the baseplate, thermal gradients are lowered and stresses can be reduced. In this work, some initial tests were performed with M2 high speed steel (HSS). The influence of preheating on density and mechanical and physical properties is investigated. The paper shows many promising results for the production of SLM parts in materials that are very sensitive to crack formation and delamination. When using a preheating of 200 °C, crack-free M2 HSS parts were produced with a relative density of 99.8%.

Some Guidance for Hull Form Selection for SWATH Ships

1988 ◽  
Vol 25 (04) ◽  
pp. 239-252
Author(s):  
G. Robed Lamb
Keyword(s):  
High Speed ◽  
Early Stage ◽  
The United States ◽  
Practical Application ◽  
Hull Form ◽  
Stage Design ◽  
Seakeeping Performance ◽  
The World ◽  
Selection For ◽  
Early Stage Design

Even though in 1987 there were only a dozen SWATH (smali-waterplane-area twin-hull) craft and ships afloat around the world, word of their markedly superior seakeeping performance is spreading rapidly. The number of SWATH vessels is likely to double within five years. As in many other areas of technology, the United States and Japan are the acknowledged leaders in the development and practical application of the SWATH concept. This paper reviews the characteristics of existing SWATH craft and ships from the standpoint of the stated seakeeping objective. Hull form differences between four SWATH craft and ships, including the Navy's SSP Kairnalino, are analyzed and interpreted. Important considerations for the early-stage design of a SWATH ship are discussed. Differences in the range of feasible hull form geometries for coastal areas and unrestricted ocean operations, and for low-speed versus moderately high-speed applications, are pointed out.

Comparison of the fast-start performances of closely related, morphologically distinct threespine sticklebacks (Gasterosteus spp.)

1996 ◽  
Vol 199 (12) ◽  
pp. 2595-2604 ◽  
Author(s):  
T Law ◽  
R Blake
Keyword(s):  
Angular Velocity ◽  
High Speed ◽  
High Performance ◽  
Gasterosteus Aculeatus ◽  
Morphological Characteristics ◽  
Maximum Velocity ◽  
Threespine Stickleback ◽  
Biomechanical Study ◽  
Maximum Acceleration ◽  
Fast Start

Fast-start escape performances for two species of threespine stickleback, Gasterosteus spp., were investigated using high-speed cinematography (400 Hz). The two fishes (not yet formally described, referred to here as benthic and limnetic) inhabit different niches within Paxton Lake, British Columbia, Canada, and are recent, morphologically distinct species. All escape responses observed for both species were double-bend C-type fast-starts. There were no significant differences between the species for any linear or angular parameter (pooled averages, both species: duration 0.048 s, distance 0.033 m, maximum velocity 1.10 m s-1, maximum acceleration 137 m s-2, maximum horizontal angular velocity 473.6 rad s-1 and maximum overall angular velocity 511.1 rad s-1). Benthics and limnetics have the greatest added mass (Ma) at 0.3 and 0.6 body lengths, respectively. The maximum Ma does not include the fins for benthics, but for limnetics the dorsal and anal fins contribute greatly to the maximum Ma. The deep, posteriorly placed fins of limnetics enable them to have a fast-start performance equivalent to that of the deeper-bodied benthics. Both the limnetic and benthic fishes have significantly higher escape fast-start velocities than their ancestral form, the anadromous threespine stickleback Gasterosteus aculeatus, suggesting that the high performance of the Paxton Lake sticklebacks is an evolutionarily derived trait. In this biomechanical study of functional morphology, we demonstrate that similar high fast-start performance can be achieved by different suites of morphological characteristics and suggest that predation might be the selective force for the high escape performance in these two fishes.

scholarly journals A New Rotor Position Measurement Method for Permanent Magnet Spherical Motors

2018 ◽  
Vol 8 (12) ◽  
pp. 2415 ◽  
Author(s):  
Yin Lu ◽  
Cungang Hu ◽  
Qunjing Wang ◽  
Yi Hong ◽  
Weixiang Shen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Measurement Method ◽  
Coordinate Frame ◽  
Feature Points ◽  
Position Measurement ◽  
Experimental Platform ◽  
Rotor Position ◽  
Straight Line ◽  
The World

This paper proposes a new high-precision rotor position measurement (RPM) method for permanent magnet spherical motors (PMSMs). In the proposed method, a LED light spot generation module (LSGM) was installed at the top of the rotor shaft. In the LSGM, three LEDs were arranged in a straight line with different distances between them, which were formed as three optical feature points (OFPs). The images of the three OFPs acquired by a high-speed camera were used to calculate the rotor position of PMSMs in the world coordinate frame. An experimental platform was built to verify the effectiveness of the proposed RPM method.

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