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Suppression of interfacial crack for foam core sandwich panel with crack arrester
Hirose, Y.,Hojo, M.,Fujiyoshi, A.,Matsubara, G. The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.1
Since delamination often propagates at the interfacial layer between a surface skin and a foam core, a crack arrester is proposed for the suppression of the delamination. The arrester has a semi-cylindrical shape and is arranged in the foam core and is attached to the surface skin. Here, energy release rates and complex stress intensity factors are calculated using finite element analysis. Effects of the arrester size and its elastic moduli on the crack suppressing capability are investigated. Considerable reductions of the energy release rates at the crack tip are achieved as the crack tip approached the leading edge of the crack arrester. Thus, this new concept of a crack arrester may become a promising device to suppress crack initiation and propagation of the foam core sandwich panels.
Z - R relation for snowfall using small Doppler radar and high sensitive snow gauges
M. Kubo,A. Sougen,K. Muramoto,Y. Fujiyoshi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Snowfall data was simultaneously recorded by a weather radar, two high sensitive snow gauges and an imaging system with high accuracy at short time intervals. The snowfall rate R was measured with two gauges and radar reflectivity factor Z was measured using a small bistatic X-band Doppler radar. The images of falling snow particles were used to obtain size and related parameters. Since all the measurements were located in a small area, it can be said that the obtained reference data corresponds well to radar data, and it is possible to analyze snowfall rate variations in sufficient detail for practical purposes. Snowfall was observed in Kanazawa, Japan, in the winter of 2009. A total of 22 snowfall events was extracted for type of snowflake or graupel, varying in duration from 4 to 31 minutes. These were then treated separately to calculate the coefficients of Z - R relation. The observations suggest that parameters of snow particle properties are useful to understand radar measurement.
Shape classification of snow particle into snowflake and graupel using image processing
M. Kubo,K. Seto,K. Muramoto,Y. Fujiyoshi,T. Shinoda,T. Ohigashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Classification of snowflakes is important in the investigation of the growth process of snow particles and radar meteorology, etc. This paper proposes an automatic image processing method for classification of falling snow particles. A side view of natural falling snow particles was photographed by IEEE1394 camera (1280 × 960 pixel) with a shutter speed of 1/10000 s. To obtain shape parameters, both a binary and a gray-level image of each particle were recorded continuously. Each particle was classified into a graupel or a snowflake by statistical classification procedure using image features. The proposed method has been successfully tested in snowfall, obtaining the percentages of snowflakes and graupels at 1 min interval.
Visualization of water vapor distribution in the lower atmosphere using two lidars
M. Kubo,K. Nakamura,K. Muramoto,T. Ohigashi,T. Shinoda,Y.Fujiyoshi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Water vapor distribution in the lower atmosphere was observed using two optical lidars (ceilometer) set up at the distance of 3.1 km. Range height indicator (RHI) display was constructed from two time series data measured by each lidar. The instruments were also included small vertical radar and snowfall gauge. All the data were displayed on the same coordinate system to compare the profiles with time synchronization. To examine horizontal distribution of water vapor (cloud) widely, conventional weather radar was also used. Combination of all these instruments and methods will be potent system for understanding lower atmospheric structure.