Wyniki wyszukiwania - Biblioteka Nauki

1

Mathematical model for feed drive system in microscopic motion area

100%

Yamazaki T.

Archives of Materials Science and Engineering

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2008

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tom Vol. 33, nr 1

35-38

EN

Purpose: Our objective is to develop an entirely new the feed drive system with the accuracy of tens nanometers and the stroke of tens millimetres achieved by only one mechanism. Design/methodology/approach: The dynamic driving torques can be measured when the sinusoidal waves of the microscopic displacement are applied to the AC servo motor. The mathematical model of the feed drive system that considers this dynamic behaviour is proposed. Findings: We make hysteresis phenomenon clear in the range from 2 μm to 100 μm by the nonlinear spring characteristics. Taking the friction model into account, the driving torque can be formulated. The proposed friction model represents successfully the experimental results for the sinusoidal wave within the ranges of amplitude from 2 μm to 100 μm. In case that the amplitude is 1 μm, though the amplitudes of the driving torque are slightly different, the curve shows the similar shape. Research limitations/implications: The results of this research covers the feed drive system with the AC servo motor and rolling guide. But, because the dynamic behaviour the rolling element was analyzed, it can be also applicable to the feed drive system with rolling element. Practical implications: This paper presents more details of driving torque in microscopic motion area, so that the performance of the feed drive system with rolling elements can be improved. Originality/value: The originality of this research project is to develop an entirely new feed drive system with the one mechanism and with the high accuracy.

2

The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 1, General procedure

63%

Yamazaki T. , Kuroda K.

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tom Vol. 28, no. 3

69-75

EN

The paper focuses on the finding which parts of machinery should be modified in order to reduce the noise. The countermeasure is decided by being based on the theoretical formulation the statistical energy analysis (SEA). The proposed process is applied to determine the countermeasures to structure-borne noise in a commercial product (A4 laser printer). This study is the first report of a series to develop a process based on the SEA.

PL

Artykuł poświęcono metodzie wyszukiwania podukładów maszyn, które powinny być zmodyfikowane w celu obniżenia poziomu hałasu. Metoda bazuje na statystycznej analizie przepływu energii (SEA). Zaproponowaną metodę zastosowano do obniżenia hałasu wytwarzanego przez drukarkę laserową. Artykuł jest pierwszą częścią raportu poświęconego omawianej metodzie.

3

The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 2, Structural optimization of subsystems

51%

Kuroda K. , Kuratani F. , Yamazaki T.

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tom Vol. 28, no. 3

76-82

EN

This paper presents the formulation of the structural optimization method on the basis of statistical energy analysis. A4 laser beam printer consisting of eight finite elastic steel plates is considered as an example, where the mass is taken as a constraint function. Consequently, taking one CLF as the objective function, an optimization of the thickness of the shell elements is performed showing the efficiency of the structural optimization method.

PL

W pracy zaprezentowano sformułowanie metody optymalizacji struktury bazującej na analizie statystycznego rozkładu energii. Jako przykład obiektu wybrano drukarkę laserową, której elementami jest osiem stalowych płyt. W przyjętej metodzie optymalizacji masy płyt pełnią rolę ograniczeń. Przyjmując CLF jako funkcję celu, przeprowadzono optymalizację grubości elementów powłokowych, pokazując efektywność metod optymalizacji strukturalnej.

4

On approximate point joint spectrum of p-hyponormal and log-hyponormal operators

51%

Chō M. , Sołtysiak A. , Yamazaki T.

Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae

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2003

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tom [Z] 43(1)

33-41

EN

We show that the approximate point joint spectrum of an arbitrary n-tuple of p-hyponormal (or log-hyponormal) operators can be obtained from the spectral set 7 introduced by Mclntosh and Pryde. This is a generalization of a result proved by the second named author for hyponormal operators. We also obtain a similar result for log-hyponormal operators based on the polar decomposition.

5

Dynamic behaviours of driving torque of machine tools in microscopic motion

51%

Yamazaki T. , Kaneko S. , Sato R.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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tom Vol. 20, nr 1-2

523-526

EN

Purpose: This paper presented more details for control analysis of the dynamic behaviors of the feed drive systems that have been widely used in machine tools. Design/methodology/approach: In order to analyze the nonlinear behaviors of the feed drive system in microscopic motion, the dynamic driving torques were measured when the sinusoidal waves of the microscopic displacement are applied to the AC servo motor. Findings: The experimental results showed that the distortion of the driving torque response to the sinusoidal wave input of the microscopic displacement becomes gradually evident as the input amplitude increases. With the particular input amplitudes of 200 mm and over, it can be found that the driving torque response for the displacement show the periodic response. It is considered in the AC servo motor used by experiment that the vibration is caused whenever the motor rotates by 20 degrees. It is consider that it is affected by the structure of the motor. Research limitations/implications: The results of this research covered the feed drive system with the AC servo motor and rolling guide. However, because the dynamic behavior the rolling element was analyzed, it was also applicable the feed drive system with the linear motor and rolling guide. Practical implications: This paper cleared more details of driving torque in microscopic motion, the performance of the feed drive system with rolling elements would be improved. Originality/value: The objective of this research project was to develop the feed drive system with the one mechanism and with the high accuracy.

6

Influence of delayed spawning time of Coregonus peled on the fatty acid composition of its tissues

51%

Dabrowski K. , Yamazaki T. , Satoh S. , Takashima F.

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nr 3-4

7

Effects of production parameters on characteristics of magnesium alloy sheets manufactured by twin-roll casting

45%

Watari H. , Haga T. , Davey K. , Koga N. , Yamazaki T.

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2006

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tom Vol. 16, nr 1-2

171--176

EN

Purpose: The purpose of the work is to establish a manufacturing process and technology to facilitate the economical manufacture of high-quality magnesium sheet alloys. Design/methodology/approach: Magnesium alloy AZ31B was used to investigate the appropriate manufacturing conditions for use in twin-roll strip casting. Temperatures of the molten materials and roll speeds were varied to find the appropriate manufacturing conditions. The effects of manufacturing conditions on possible forming were clarified in terms of roll speeds and roll gaps between upper and lower rolls. Findings: In the hot-rolling process, a temperature exceeding 200°C was chosen to keep cast products from cracking. An appropriate annealing temperature was effective for homogenizing the microstructure of the rolled cast sheets after the strip casting process. The grain size of the manufactured wrought magnesium alloys sheet was less than 10 micrometers. The obtained magnesium alloy sheet exhibited an equivalent limiting drawing ratio in a warm-drawing test. Research limitations/implications: AZ31 were used to investigate the appropriate manufacturing conditions for use in twin-roll strip casting. Casting temperatures were varied from 630°C to 670°C to find the best casting conditions. Roll casting speeds were varied from 5m/min to 30 m/min in order to examine which roll speed was appropriate for solidifying the molten magnesium. Practical implications: It was found that the cast magnesium sheet manufactured by roll strip casting could be used for plastic forming if the appropriate magnesium sheets were produced after the roll casting process. Originality/value: This paper showed the effectiveness of twin roll casting for magnesium alloys by a horizontal roll caster.