Application of reproducible impulse loading to study osteochondral grafting procedures

2006 ◽  
Vol 39 ◽  
pp. S479 ◽  
Author(s):  
T. Kressner ◽  
T. Schwenke ◽  
U.-J. Goerke ◽  
M.A. Wimmer
2013 ◽  
Vol 02 (03) ◽  
pp. 212-219 ◽  
Author(s):  
Wing-Iim Tse ◽  
Clar Wong ◽  
Esther Chow ◽  
Pak-cheong Ho

2013 ◽  
Vol 588 ◽  
pp. 175-183
Author(s):  
Andrzej Grządziela

Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modeled by means of statistical methods. Much more problems arise from modeling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explosion is meant as a violent upset of balance of a given system due to detonation of explosives in water environment. A paper presents a proposal of identification of a degree of hazard the ships hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models.


1978 ◽  
Vol 10 (6) ◽  
pp. 717-720
Author(s):  
V. I. Romanchenko ◽  
G. V. Stepanov ◽  
K. K. Amel'yanovich ◽  
E. V. Sobolev
Keyword(s):  

1992 ◽  
Vol 24 (7) ◽  
pp. 447-450
Author(s):  
V. N. Katanchik ◽  
V. V. Malyatin

2019 ◽  
Vol 28 (3) ◽  
pp. 321-331
Author(s):  
Dorota Kula

Investigated in the paper boundary effect behaviour for a single odd amplitude which loads rectangular boundary of the two-phased periodic composite layer confirms the common view through the prism of the expected strong suppression of the boundary impulses of the physical field near the boundary of the region occupied by the composite. There is no presence of a composite reaction to the boundary loadings mentioned here different than the exponential damping effect. However, the presence in the general equation describing the boundary effect equations the component 2λssurf pqzαq with the first space derivative responsible for suppression of the solution along the axis Oz should cause not only exponential type of boundary temperature fluctuation damping. This component disappears in principle for the boundary effect analysed for a single impulse.


2018 ◽  
Vol 02 (02) ◽  
pp. 081-087
Author(s):  
Tyler Collins

AbstractTreatment of cartilage pathology is controversial. In the hip, it is even more so as identification and treatment of early cartilage disease are relatively new and little evidence exists. With the advent and more widespread use of hip arthroscopy, easier access to the hip joint is available, and adequate treatment is possible with less morbidity. Many treatment options exist for cartilage lesions including nonoperative treatment, debridement, microfracture, acetabuloplasty, cartilage fixation, cartilage scaffolds, autologous chondrocyte implantation, and osteochondral grafting. While far from definitive, the current evidence suggests that smaller cartilage lesions (< 4 cm2) have good results with most treatments while larger lesions fare better with treatments that produce hyaline-like cartilage. The most cost-effective arthroscopic treatments of smaller cartilage lesions include acetabuloplasty and microfracture, while larger lesions should be considered for autologous matrix-induced chondrogenesis or matrix-assisted autologous chondrocyte implantation. Larger cartilage lesions with bone disease are more adequately treated with open procedures such as osteochondral grafting or total hip arthroplasty.


Author(s):  
Olufemi R. Ayeni ◽  
Volker Musahl ◽  
Riley J. Williams

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