The Experts below are selected from a list of 6126 Experts worldwide ranked by ideXlab platform
Haitao Liu - One of the best experts on this subject based on the ideXlab platform.
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a mechanical structure based design method and its implementation on a fly cutting machine tool design
The International Journal of Advanced Manufacturing Technology, 2014Co-Authors: Yingchun Liang, Wanqun Chen, Yazhou Sun, Xichun Luo, Haitao LiuAbstract:The mechanical structure has a main influence of the machining performance and the servo performance. In this study, a mechanical structure-based design method is presented to design and optimize an ultraprecision fly-cutting machine tool. This method takes full account of the influence of mechanical components on the machining performance and servo performance at the design stage. The effect of the components structure on the roughness of machined surface is discussed, and an optimized structural form of the aerostatic spindle is given. The influence of the mechanical structure on the control system and electronic drives is discussed, and an integrated dynamic design model is built and used to optimize the hydrostatic slide. Furthermore, the impact of mechanical system dynamic performance of the machine tool on the processing topography is analyzed by the finite element model of the machine tool. This method provides a theoretical basis for the design and optimization of mechanical components and machine tools Stiffness Loop.
Jentzsch Thorste - One of the best experts on this subject based on the ideXlab platform.
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The best knot and suture configurations for high-strength suture material. An in vitro biomechanical study
Elsevier, 2018Co-Authors: Meyer, Dominik C, Achma Elias, Läderma Alexandre, Lajtai Georg, Jentzsch ThorsteAbstract:Purpose Surgical knots are particularly challenged by high-strength suture material. It was hypothesized that sutures in a double-stranded Looped configuration present mechanical advantages. Methods This in vitro biomechanical study repeatedly tested 12 different knots with a static distraction material testing machine with a constant tensile speed. The cow hitch, its altered version, and conventional half hitches were also tested on bovine tendon. Suture material was braided polyblend non-bioresorbable polyester. Primary outcome was knot security (Stiffness) at clinical failure (≥ 3 mm displacement). Secondary outcomes were knot size and Loop security. Results Double-stranded Looped knots were up to three times stronger than one and a half- and single-stranded knots. The cow hitch was stiffest (mean 185 [95% CI 172–197] Newton per millimeter [N/mm]) (p < 0.001), followed by the Nice knot (169 [154–183] N/mm). It was stiffer than half hitches (65 [53–78] N/mm). These findings remained in tendons (82 [77–86] and 40 [32–49] N/mm, p < 0.001). The cow hitch (7.6 mm3) and Nice knot (6.1 mm3) were smaller than half hitches (9.5 mm3). Loop security did not differ between the cow hitch and Nice knot, but was higher in the cow hitch than half hitch (158 [120–196] N and 85 [57–113] N, p < 0.001). Conclusions Double-stranded knot configurations with a Loop on one side are mechanically stronger and stiffer, less bulky, and preserve applied tension during tying better than conventional knots. The best performing and technically most simple knots best suited to exploit enormous mechanical capabilities of modern high-strength suture material are the cow hitch and Nice knot. Level of evidence Not applicable due to the biomechanical nature of the study. Keywords Knot Cow hitch (Lark's head) Half hitch Knot security (Stiffness) Loop security (tension) Siz
Yingchun Liang - One of the best experts on this subject based on the ideXlab platform.
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a mechanical structure based design method and its implementation on a fly cutting machine tool design
The International Journal of Advanced Manufacturing Technology, 2014Co-Authors: Yingchun Liang, Wanqun Chen, Yazhou Sun, Xichun Luo, Haitao LiuAbstract:The mechanical structure has a main influence of the machining performance and the servo performance. In this study, a mechanical structure-based design method is presented to design and optimize an ultraprecision fly-cutting machine tool. This method takes full account of the influence of mechanical components on the machining performance and servo performance at the design stage. The effect of the components structure on the roughness of machined surface is discussed, and an optimized structural form of the aerostatic spindle is given. The influence of the mechanical structure on the control system and electronic drives is discussed, and an integrated dynamic design model is built and used to optimize the hydrostatic slide. Furthermore, the impact of mechanical system dynamic performance of the machine tool on the processing topography is analyzed by the finite element model of the machine tool. This method provides a theoretical basis for the design and optimization of mechanical components and machine tools Stiffness Loop.
Meyer, Dominik C - One of the best experts on this subject based on the ideXlab platform.
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The best knot and suture configurations for high-strength suture material. An in vitro biomechanical study
Elsevier, 2018Co-Authors: Meyer, Dominik C, Achma Elias, Läderma Alexandre, Lajtai Georg, Jentzsch ThorsteAbstract:Purpose Surgical knots are particularly challenged by high-strength suture material. It was hypothesized that sutures in a double-stranded Looped configuration present mechanical advantages. Methods This in vitro biomechanical study repeatedly tested 12 different knots with a static distraction material testing machine with a constant tensile speed. The cow hitch, its altered version, and conventional half hitches were also tested on bovine tendon. Suture material was braided polyblend non-bioresorbable polyester. Primary outcome was knot security (Stiffness) at clinical failure (≥ 3 mm displacement). Secondary outcomes were knot size and Loop security. Results Double-stranded Looped knots were up to three times stronger than one and a half- and single-stranded knots. The cow hitch was stiffest (mean 185 [95% CI 172–197] Newton per millimeter [N/mm]) (p < 0.001), followed by the Nice knot (169 [154–183] N/mm). It was stiffer than half hitches (65 [53–78] N/mm). These findings remained in tendons (82 [77–86] and 40 [32–49] N/mm, p < 0.001). The cow hitch (7.6 mm3) and Nice knot (6.1 mm3) were smaller than half hitches (9.5 mm3). Loop security did not differ between the cow hitch and Nice knot, but was higher in the cow hitch than half hitch (158 [120–196] N and 85 [57–113] N, p < 0.001). Conclusions Double-stranded knot configurations with a Loop on one side are mechanically stronger and stiffer, less bulky, and preserve applied tension during tying better than conventional knots. The best performing and technically most simple knots best suited to exploit enormous mechanical capabilities of modern high-strength suture material are the cow hitch and Nice knot. Level of evidence Not applicable due to the biomechanical nature of the study. Keywords Knot Cow hitch (Lark's head) Half hitch Knot security (Stiffness) Loop security (tension) Siz
Wanqun Chen - One of the best experts on this subject based on the ideXlab platform.
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a mechanical structure based design method and its implementation on a fly cutting machine tool design
The International Journal of Advanced Manufacturing Technology, 2014Co-Authors: Yingchun Liang, Wanqun Chen, Yazhou Sun, Xichun Luo, Haitao LiuAbstract:The mechanical structure has a main influence of the machining performance and the servo performance. In this study, a mechanical structure-based design method is presented to design and optimize an ultraprecision fly-cutting machine tool. This method takes full account of the influence of mechanical components on the machining performance and servo performance at the design stage. The effect of the components structure on the roughness of machined surface is discussed, and an optimized structural form of the aerostatic spindle is given. The influence of the mechanical structure on the control system and electronic drives is discussed, and an integrated dynamic design model is built and used to optimize the hydrostatic slide. Furthermore, the impact of mechanical system dynamic performance of the machine tool on the processing topography is analyzed by the finite element model of the machine tool. This method provides a theoretical basis for the design and optimization of mechanical components and machine tools Stiffness Loop.