A device that measures the power generated by prime movers such as steam engines, internal combustion engines, and water wheels, and the power consumed by work machines such as compressors and pumps. They are broadly divided into two types based on the measurement principle: (1) Absorption dynamometers: These determine power by directly measuring the rotational moment at the time of braking and converting the power of the prime mover into heat or electricity. Examples of these dynamometers include solid friction dynamometers (e.g., Broni dynamometer), hydraulic dynamometers (e.g., Junkers hydraulic dynamometer), air dynamometers (e.g., Renard air dynamometer), electric dynamometers, and gear pump dynamometers. (2) Transmission dynamometers: These determine power by indirectly measuring the rotational moment while the power is being transmitted, and can measure the rotational moment during use. Examples of these dynamometers include torsional dynamometers (e.g., Amsler torsional dynamometer), gear dynamometers, and belt dynamometers. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
蒸気機関,内燃機関,水車などの原動機の発生動力,および圧縮機,ポンプなどの作業機械の消費動力を測定する装置。測定原理により,次の2つに大別される。 (1) 吸収動力計 原動機の動力を制動して熱または電気に変え,その際の回転モーメントを直接測定して動力を求めるもので,固体摩擦動力計 (例:ブローニ動力計) ,水動力計 (例:ユンカース水動力計) ,空気動力計 (例:ルナール空気動力計) ,電気動力計,歯車ポンプ動力計などがある。 (2) 伝達動力計 動力が伝えられる途中で間接的に回転モーメントを測定して動力を求めるもので,使用中の回転モーメントが測定できる。ねじり動力計 (例:アムスラねじり動力計) ,歯車動力計,ベルト動力計などがある。
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