（2016 年1 月～ 2016 年12 月の期間で集計）
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第94期編修理事会

Prospect and Recent Research & Development for Civil Use Autonomous Unmanned Aircraft as UAV and MAV

Kenzo NONAMI

Journal of System Design and Dynamics (2007)　DOI:10.1299/jsdd.1.120

 

This paper describes the present state of research and development for civil use autonomous unmanned aircraft. In particular,the history of civil use UAVs, the research and development in the world and in Japan, and the subjects and prospects for control and operation systems of civil use autonomous UAVs are described.

 

Large eddy simulation with modeled wall-stress: recent progress
and future directions

Johan LARSSON, Soshi KAWAI, Julien BODART, Ivan BERMEJO-MORENO
Mechanical Engineering Reviews (2016)　DOI:10.1299/mer.15-00418

 

The paper provides a brief introduction to the near-wall problem of LES and how it can be solved through modeling of the near-wall turbulence. The distinctions and key differences between different approaches are emphasized, both in terms of fidelity (LES, wall-modeled LES, and DES) and in terms of different wall-modeled LES approaches (hybrid LES/RANS and wall-stress-models). The focus is on approaches that model the wall-stress directly, i.e., methods for which the LES equations are formally solved all the way down to the wall. Progress over the last decade is reviewed, and the most important and promising directions for future research are discussed.

Effects of initial crystallinity and molecular orientation on hydrolysis
and mechanical properties of self-reinforced poly(lactic acid) screws

Masato SAKAGUCHI, Satoshi KOBAYASHI
Mechanical Engineering Journal (2016)　DOI:10.1299/mej.15-00629

 

Poly(lactic acid) (PLA) attracts much attention as a typical  biodegradable and biocompatible polymer, because it degrades to nontoxic lactic acid through non-enzymatic hydrolytic degradation. Processing of PLA bone ­xation devices have been investigated to improve their mechanical properties. Among ­xations, screws are referred as one of the most general bone ­xation device. The purpose of the present study is to clarify the effect of initial higher-order structure on degradation behavior and associated mechanical properties for self-reinforced PLA screws. PLA screws were prepared through a series of routes including casting extrusion drawing and forging. These screws were immersed in phosphate buffer solution (PBS) for 0, 8, 16 and 24 weeks, and orientation function, crystallinity, molecular weight and shear strength were measured. As a result, initial shear strength increased and degradation ratio decreased with orientation. This is due to lower water absorption caused by orientation crystallization. Shear strength decreased approximately 15 % at least with 24 weeks immersion. The results of the crystallinity showed that the screws were selectively hydrolyzed in amorphous region. This fact suggested that shear strength retention depends on hydrolysis in amorphous region. Initial shear strength for extrusion ratio (ER) 2 is the highest although the orientation function is the lowest. And the strength rapidly decreased with 8 weeks immersion. This might be due to hydrolysis of oriented tie chains. Although β crystals emerged only at ER 4, there was not clear difference in molecular weights and shear strength. This result suggested that the crystal form has little effects on degradation behavior and mechanical properties.

 

4 位	How is residual stress/strain detected in bone tissue ? Shigeru TADANO, Satoshi YAMADA Mechanical Engineering Reviews (2016)　DOI:10.1299/mer.15-00291
5 位	Pore-scale investigation of the effect of connate water on water flooding behavior Arief SETIAWAN, Tetsuya SUEKANE, Yoshihiro DEGUCHI, Koji KUSANO Journal of Fluid Science and Technology (2014)　DOI:10.1299/jfst.2014jfst0012
6 位	A review of flux reconstruction or correction procedure via reconstruction method for the Navier-Stokes equations Z.J. WANG, H.T. HUYNH Mechanical Engineering Reviews (2016)　DOI:10.1299/mer.15-00475
7 位	Heat conduction in nanostructured materials Sebastian VOLZ, Junichiro SHIOMI, Masahiro NOMURA, Koji MIYAZAKI Journal of Thermal Science and Technology (2016)　DOI:10.1299/jtst.2016jtst0001
8 位	A Review on High-Speed Machining of Titanium Alloys Mustafizur RAHMAN, Zhi-Gang WANG, Yoke-San WONG JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing (2006)　DOI:10.1299/jsmec.49.11
9 位	Simulation Analysis of the Effect of Trunk Undulation on Swimming Performance in Underwater Dolphin Kick of Human Motomu NAKASHIMA Journal of Biomechanical Science and Engineering (2009)　DOI:10.1299/jbse.4.94
10位	Transition to turbulence in wall-bounded flows: Where do we stand? Paul MANNEVILLE Mechanical Engineering Reviews (2016)　DOI:10.1299/mer.15-00684