Analysis of the tennis racket vibrations during forehand drives: Selection of the mother wavelet

Blache, Yoann; Hautier, Christophe; Lefèbvre, Frédéric; Djordjevic, A.; Creveaux, Thomas; Rogowski, Isabelle

doi:10.1016/j.jbiomech.2017.07.006

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Penelitian perilaku raket tenis dengan bola telah dilakukan antara lain analisis balok fleksibel yang merujuk pada efekketegangan tali dan kekakuan rangka pada kinerja raket [11]. Penelitian lain adalah analisis mekanis raket dan bola tenis selama tumbukan berdasarkan metode elemen hingga [1], analisis getaran senar [12], pengukuran respon senar raket [13], pemodelan getaran dan penekanan [6], factor penyebab getaran [14], getaran dan transmisi gelombang kejut ke pergelangan tangan [15], impak, tegangan senar dan getaran raket berbahan komposit nano [16], perilaku dinamik raket dalam beberapa situasi pertandingan [17], pengaruh ketegangan raket terhadap gaya pada siku lengan [18], efek pegangan (grip) terhadap perilaku dinamik raket [19], dan getaran raket saat pukulan forehand [20].…”

Section: Pendahuluanunclassified

Karakteristik Lendutan Raket Tenis Akibat Kontak Dengan Bola

Rubiono¹,

Mukhtar²

2022

INJECTION

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Kontak antara bola dengan raket tenis adalah fenomena tumbukan benda. Bola memberikan gaya pada raket yang menyebabkan defleksi atau lendutan. Penelitian ini bertujuan untuk mendapatkan karakteristik lendutan raket tenis akibat kontak dengan bola. Penelitian dilakukan dengan eksperimen menggunakan raket merk Kinetik. Raket ditumpu jepit di bagian pegangan. Bola yang digunakan adalah merk Nassau dengan massa 0,058 kg. Bola dikondisikan jatuh bebas dengan tinggi jatuh divariasikan sebesar 1, 2 dan 3 meter, dengan 3 titik jatuh di bidang senar raket. Pengukuran lendutan menggunakan metode pena yang diposisikan di 5 titik pengukuran di rangka raket. Lima titik diatur berurutan dari pegangan raket dengan jarak antara 6 cm. Pengambilan data dilakukan dengan 3 kali ulangan untuk mendapatkan nilai rata-rata. Pengukuran defleksi dilakukan menggunakan jangka sorong dengan tingkat ketelitian 0,01 mm. Hasil penelitian menunjukkan bahwa lendutan memiliki karakteristik yang linier dan tergantung pada momentum bola.

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Section: Pendahuluanunclassified

Karakteristik Lendutan Raket Tenis Akibat Kontak Dengan Bola

Rubiono¹,

Mukhtar²

2022

INJECTION

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“…The wavelet function contents the fixed condition of shiftinvariant form, it is based on the inner product of nonlinear mapping on different scales, and the difference between the original and recovered data can be represented by shiftinvariant form [41]. Nowadays, wavelet function is acted as the kernel of WSVM and WKNN, and classification result is improved as the dataset is mapped into different scales.…”

Section: A Classification Process With W 2 Jsrementioning

confidence: 99%

A Hyperspectral Image Classification Method Based on Weight Wavelet Kernel Joint Sparse Representation Ensemble and β-Whale Optimization Algorithm

Wang

Jia

Luo

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Joint sparse representation (JSR) is a commonly used classifier to recognize different objects with core features extracted from images. However, the generalization ability is weak for traditional linear kernel, and the objects with similar feature values affiliated to different categories are not enough distinguished especially for hyperspectral image (HSI). In the paper, a HSI classification technique based on weight wavelet kernel JSR ensemble (W 2 JSRE) model and β-whale optimization algorithm (WOA) is proposed to conduct pixel-level classification, where wavelet function is acted as the kernel of JSR. Moreover, ensemble learning is used to determine the category label of each sample by comprehensive decision of some sub-classifiers, and β function is utilized to enhance the exploration phase of WOA and obtain the optimal weight of sub-classifiers. Experimental results indicate that the performance of proposed HSI classification method is better than that of other newly proposed and corresponding approaches, the misclassification and classified noise are eliminated to some extent, and the overall classification accuracy reaches 95% for entire HSIs.

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“…When the opponent attempts to attack with backhand topspin against backspin, a more skilled backhand technique can gain more initiative in the holding phase and thus take advantage [9]. The common problems of novice or amateur players in using backhand topspin against backspin are: when backhand topspin against backspin is used to return the ball, they often feel that the force is not smooth resulting in a lack of return strength; in addition, there is also a low starting position of the arm during backswing, and although the ball has sufficient friction with the rubber surface to obtain sufficient rotation, it also causes the ball to fly too high, and the final landing point is too close to the blocking net, which increases the probability of going under the net; in the early stage of practicing backhand topspin against backspin, novice and amateur players often habitually pay attention to arm force, hoping to enhance the degree of backspin, but the forced use of arm force is easy to cause arm injury [10]. When new players and amateurs train on backhand topspin against backspin skills, they usually need a coach to help them correct their movement errors when facing the problems mentioned above.…”

Section: Backhand Topspin Against Backspinmentioning

confidence: 99%

Biomechanical comparison of backhand topspin against backspin between different level table tennis athletes using QUALSYS infrared acquisition

Guo

2021

The Journal of Engineering

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The technique of backhand topspin against backspin is important for table tennis players to gain more advantages in the confrontation. In this paper, a biomechanical analysis of backhand topspin against backspin was conducted with varsity and non-varsity male table tennis players from Zhejiang Changzheng Vocational and Technical College. The QUAL-ISYS infrared acquisition system collected the changes in the athletes' limb movements, and the force platform collected the changes in the athletes' limb moments in the ball striking process. The results showed that professionally trained athletes were able to achieve greater joint angles and provide greater torques to the shoulder, elbow and wrist joints at the moment of batting. The main purpose of this paper is to provide data reference for the improvement of backhand stroke technique by studying the pattern of limb movements of players when they perform backhand stroke. In summary, in order to improve the backhand technique of hitting backspin, athletes need to focus on training the shoulder, elbow and wrist joints to achieve greater variations of angles and greater torques. The novelty of this paper is collecting the body movements of backhand strokes in a more concise and fast way with the QUALISYS infrared acquisition system. KEYWORDS backhand topspin against backspin, biomechanics, QUALISYS, table tennisHow to cite this article: Guo, H.: Biomechanical comparison of backhand topspin against backspin between different level table tennis athletes using QUALSYS infrared acquisition.

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Analysis of the tennis racket vibrations during forehand drives: Selection of the mother wavelet

Cited by 4 publications

References 37 publications

Karakteristik Lendutan Raket Tenis Akibat Kontak Dengan Bola

Karakteristik Lendutan Raket Tenis Akibat Kontak Dengan Bola

A Hyperspectral Image Classification Method Based on Weight Wavelet Kernel Joint Sparse Representation Ensemble and β-Whale Optimization Algorithm

Biomechanical comparison of backhand topspin against backspin between different level table tennis athletes using QUALSYS infrared acquisition

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