書誌事項
- タイトル別名
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- Improvement of Zero-shift Characteristic of Engine Indicator
- エンジン シアツケイ ニ オケル レイテン イドウ トクセイ ノ カイゼン ニ
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In a strain gauge-strain tube type engine indicator (conventional indicator), zero-shift is caused by the thermal strain of that part of the engine at which the indicator is installed. The amount of zero-shift increases to about 10% of full scale under actual operating conditions.<BR>In this paper, what brings about the zero-shift in the conventional indicator is analyzed into factors. On the basis of the results, we attempted to reduce the amount of zero-shift by the following methods:<BR>a) The spring constant of the diaphragm is reduced in the conventional indicator.<BR>b) The threaded connection for the indicator is structurally modified (new type indicator) .<BR>c) The conventional indicator is used with the water-cooled adapter.<BR>In addition, we ascertained the dynamic characteristic of the indicator with each of the above modifications.<BR>We verified that, for the conventional indicator, the amount of zero-shift varies with the spring constant of the diaphragm, the relationship between the two being nearly linear.<BR>We found also that the new type indicator has a better zero-shift characteristic. The amount of zero-shift can be reduced to about 4% of full scale under actual operating conditions, without deteriorating the dynamic characteristic.<BR>For the conventional indicator with the water-cooled adapter, the dynamic characteristic was worse than that of the conventional indicator but its zero-shift characteristics was far better, the zero-shift being only about 0.7% of full scale under actual operating conditions. It follows that this method can be used where the frequency of pressure cycle is not high.
収録刊行物
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- 日本舶用機関学会誌
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日本舶用機関学会誌 14 (5), 425-432, 1979
公益社団法人 日本マリンエンジニアリング学会
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詳細情報 詳細情報について
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- CRID
- 1390001205160538112
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- NII論文ID
- 130001333976
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- NII書誌ID
- AN00196373
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- ISSN
- 18844758
- 03883051
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- NDL書誌ID
- 2052743
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 使用不可