The generating process of piston knock noise is thoroughly analyzed by the study of piston motion state and knock process with the engine at the rated engine speed.

进一步分析了发动机额定转速下，活塞的运动姿态和敲击过程，揭示出活塞敲击噪声的产生过程。

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Piston is the key component of combustion engine, the machining precision and the quality of piston has direct influence on the performance of the combustion engine.

活塞是内燃机的关键部件，活塞的精度和质量直接影响到内燃机的性能。

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Two are small businesses replacing their aging turboprops or twin-engine piston planes.

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In the seven or so years that I've been flying, I've put in more than 2, 000 hours at the stick of single-engine piston airplanes, including a Beechcraft Bonanza, two Cessnas and, most recently, a sleek Cirrus SR22 that I've owned for 18 months.

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EcoMotors and Achates are developing two-stroke, opposed piston diesel engines while Pinnacle is working on a four-stroke opposed piston gasoline engine.

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