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Application of IMEP Equation Based on Harmonic Analysis of Pressure Waveform
Kazuo Tsuchiya 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
An new equation for calculating Indicated Mean Effective Pressure (IMEP) was derived from harmonic analysis of pressure waveform, instead of conventional numerical integration of P-V diagram. In this study, examples of application of the IMEP equation are presented. A real time IMEP meter developed by use of the IMEP equation is more accurate where the number "n" of sampling pressure data per cycle is decreased. and allows high speed calculation as compared with the conventional numerical integration method. The equation can be applied to calculate Indicated Work of Stirling engines having two working spaces and three arrangements. The error is less than t 0.4% even if n is decreased until four per cycle. The IMEP equation can be also used for estimating requirement of dynamic characteristics to pressure measurement system. In case of 4 cycle D.I., for keeping the error less than t 1%. value of time constant required to piezo디ectric type is more than sixty times as long as a period of crankshaft rotation.<br/> <br/>
Measurement of Indicated Mean Effective Pressure
TSUCHIYA, Kazuo,AOKI, Mitsuhiko,Tetsuji, KOYAMA,KAWA, Tsunemichi,KAMIMOTO, Takeyuki 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
A convenient new type digital Pmi meter using a personal computer with A/D and PIO cards was developed. The Pmi meter takes an attention to low frequency harmonics in the range of 10-300 Hz in pressure wave form. It has advantage in the number of computations and accuracy as compared with a conventional method. The accuracy depends on the number of pressure data sampled per cycle, however if the sample numbers more than thirty-six for four cycle engines are selected, the error is kept approximately within 1.2%. It is accurate enough for practical usage. For monitoring Pmi, it is possible to use smaller sample numbers. The Pmi meter developed has possibility as onboard apparatus for engine control.
Ikoma, Toshikazu,Tsuchiya, Yasuo,Asai, Takao,Okano, Kiyoshi,Ito, Naoko,Endoh, Kazuo,Yamamoto, Masaharu,Nakamura, Kazutoshi Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.14
Our previous study detected aflatoxins in red chili peppers from Chile, Bolivia, and Peru, each of which have a high incidence of gallbladder cancer (GBC). Since the aflatoxin B1 concentration was not so high in these peppers, it is important to clarify the presence of other mycotoxins. Here we attempted to determine any associations between the concentrations of aflatoxins and ochratoxin A (OTA) in red chili peppers, and the corresponding GBC incidences. We collected red chili peppers from three areas in Peru: Trujillo (a high GBC incidence area), Cusco (an intermediate GBC incidence area), and Lima (a low GBC incidence rate), and from Chile and Bolivia. Aflatoxins and OTA were extracted with organic solvents. The concentrations of aflatoxins B1, B2, G1, and G2, and OTA were measured by high-performance liquid chromatography. The values obtained were compared with the incidence of GBC in each area or country. All of the red chili peppers from the three areas showed contamination with aflatoxins below the Commission of the European Communities (EC) recommended limits ($5{\mu}g/kg$), but the OTA contamination of two samples was above the EC recommended limit ($15{\mu}g/kg$). The mean concentrations of OTA in the peppers from Chile (mean $355{\mu}g/kg$, range < $5-1,059{\mu}g/kg$) and Bolivia (mean $207{\mu}g/kg$, range $0.8-628{\mu}g/kg$), which has a high incidence of GBC, were higher than that in Peru ($14{\mu}g/kg$, range < $5-47{\mu}g/kg$), which has an intermediate GBC incidence. The OTA contamination in the red chili peppers from Chile, Bolivia, and Peru was stronger than that of aflatoxins. Our data suggest that OTA in red chili peppers may be associated with the development of GBC.
배명완,Bae, Myung-Whan,Tsuchiya, Kazuo 대한기계학회 2001 KSME International Journal Vol.15 No.11
The effects of recirculated exhaust gas on the wear of cylinder liner and piston were experimentally investigated by a two-cylinder, four cycle, indirect injection diesel engine operating at 75% lo ad and 1600 rpm. For the purpose of comparison between the wear rates of the two cylinders with and without EGR, the recirculated exhaust gas was sucked into one of two cylinders after the soot in exhaust emissions was removed by an intentionally designed cylinder-type scrubber equipped with 6 water injectors(A water injector has 144 nozzles of 1.0 mm diameter), while only the fresh air was inhaled into the other cylinder. These experiments were carried out with the fuel injection timing fixed at 15.3$^{\circ}$ BTDC. It was found that the mean wear rate of cylinder liner with EGR was greater in the measurement positions of the second half than those of the first half, that the mean wear rate without EGR was almost uniform regardless of measurement positions, and that the wear rate of piston skirt with EGR increased a little bit, but the piston head diameter increased, rather than decreased, owing to soot adhesion and erosion wear, and especially larger with EGR.
Analysis of Gas Transport Properties in SCR Catalytic Process Using CFD
Byan Wahyu Riyandwita,Myung-whan Bae,Kazuo Tsuchiya 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The evaluations of density, diffusion coefficients, viscosities, thermal conductivities and specific heats are required in modeling the molecular transport of species, momentum and energy with a multi-component gaseous mixture and chemically reacting flow. Expressions for the transport coefficients suitable to the numerical simulations of chemically reacting flows are needed to achieve a reliable result. The purpose of this study is to investigate the effects of the gas transport properties on NO<SUB>x</SUB> reduction by computational fluid dynamics. A three-dimensional model is developed to simulate the selective catalytic reduction of NO<SUB>x</SUB> with ammonia as a reducing agent. The results of the simulation using temperature-dependent gas transport properties are compared with the constant ones. It is shown that the temperature-dependent gas transport properties should not be neglected especially in a high temperature range of exhaust gas simulation with chemically reacting flows in an SCR system.
Ikoma, Toshikazu,Kapoor, Vinay Kumar,Behari, Anu,Mishra, Kumudesh,Tsuchiya, Yasuo,Asai, Takao,Endoh, Kazuo,Okano, Kiyoshi,Nakamura, Kazutoshi Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.7
Our recent studies conducted in South America have shown that mycotoxin contamination of red chili peppers (RCPs) may be associated with an increased risk of gallbladder cancer (GBC). Whether this relationship exists in India, a country with a high incidence of GBC and high consumption of RCPs, is unclear. We therefore measured concentrations of aflatoxins (AFs) and ochratoxin A (OTA) in RCPs from areas of low, medium, and high incidence of GBC in India, and compared these concentrations with GBC incidence in each area. Twenty-one RCP samples were collected from nine cities (eight from a low-incidence area, five from a medium-incidence area, and eight from a high-incidence area). Concentrations of AFs and OTA were measured using high-performance liquid chromatography. No significant differences in mean concentrations of AFs and OTA were found in the three areas. AFB1 levels in the low-incidence area ($10.81{\mu}g/kg$) and high-incidence area ($12.00{\mu}g/kg$) were more than 2.2 and 2.4 times higher compared with the maximum permitted level of AFB1 in spices ($5.0{\mu}g/kg$) set by the Commission of the European Communities, or that ($4.4{\mu}g/kg$) obtained in our previous study in Chile. Our results show that the mean concentrations of mycotoxins in RCPs are similar among the three areas in India with different incidences of GBC. Further studies with human subjects are needed to evaluate any association between AFB1 and GBC.