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Contact Constraint Representation in an Assembly Using Configuration Space
Tokunaga, Hitoshi,Tanaka, Fumiki,Kishinami, Takeshi 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
In order to represent an assembly whose components have a degree of freedom (for example, kinematic mechanism), a method for deriving the position and orientation of each component in the assemlbly from the contact constraints of its geometrical elements is required. In this paper, an assembly model which represents an assembly whose components have a degree of freedom is proposed. First, a contact constraint representation between any two specific geometrical elements of two components in configuration space is introduced. Secondly, an expansion of this representation to that of a multiple component assembly is proposed. Thirdly, the representation of the relation of constraints in configuration space is proposed to represent the assembly. Finally, based on these representations, a method for deriving the region for the position and orientation of the components in an assembly is proposed.
Evaluation of IMG level 2 data using GTS
Tokunaga, Mitsuharu 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
Interferometric Monitor for Greenhouse Gases (IMG)) is a sensor to monitor the earth's radiation balance, the temperature profile of the atmosphere, the temperature of the earth's surface, and physical properties of clouds, and was loaded on ADEOS satellite. In this paper, we estimated IMC level 2 data by comparing with a Global Telecommunications System data (CTS). The IMG level2 data over sea without cloud cover gave good agreement with the value that had been obtained by buoy and sonde.
DTM Accuracy derived from SAR Interferometry
Tokunaga, Mitsuharu 대한원격탐사학회 1997 International Symposium on Remote Sensing Vol.13 No.1
The program for Digital Terrain Model (DTM) generating using SAR interferometry derived from JERS 1 was developed. The DTM were calculated using SAR Interferometry data of JERS-1 by the developed program. The accuracy of the calculated DTM is that maximum error and R. M. S . E were 217m, and 27.7m respectively. The accuracy aren't better than theoretical values, but it is regarded as the next factor. (1) positions and orientations of the satellite (2) precision of geometric correction (3) phase unwrapping algorithm In this study, the one of DTM accuracy derived from Interferometry SAR made clear.
Rotordynamic Characteristics of Floating Ring Seals in Rocket Turbopumps
Tokunaga, Yuichiro,Inoue, Hideyuki,Hiromatsu, Jun,Iguchi, Tetsuya,Kuroki, Yasuhiro,Uchiumi, Masaharu Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.3
Floating ring seals offer an opportunity to reduce leakage flows significantly in rotating machinery. Accordingly, they have been applied successfully to rotating machinery within the last several decades. For rocket turbopump applications, fundamental behavior and design philosophy have been revealed. However, further work is needed to explore the rotordynamic characteristics associated with rotor vibrations. In this study, rotordynamic forces for floating ring seals under rotor's whirling motions are calculated to elucidate rotordynamic characteristics. Comparisons between numerical simulation results and experiments demonstrated in our previous report are carried out. The three-dimensional Reynolds equation is solved by the finite-difference method to calculate hydrodynamic pressure distributions and the leakage flow rate. The entrance loss at the upstream inlet of the seal ring is calculated to estimate the Lomakin effect. The friction force at the secondary seal surface is also considered. Numerical simulation results showed that the rotordynamic forces of this type of floating ring seal are determined mainly by the friction force at the secondary seal surface. The seal ring is positioned almost concentrically relative to the rotor by the Lomakin effect. Numerical simulations agree quite well with the experimental results.