可変ピッチ・プロペラの実動応力 : 応力の測定方法

概要

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A unique technique of measuring the stress of propeller blade under service condition was developed, and applied to the stress measurement of a controllable pitch propeller of an actual ship. In this report, the measuring apparatus and methods are mainly stated, outline of which is as follws; The strain gauge wire is connected from the propeller to the steering engine room through the slip-ring on the rudder-horn. The strain gauge wires are loosened between the blade and propeller boss, and the loosened wire is covered for protection from the damage by the water flow. By this unique method, the measuring can be accomplished without extracting and boring of propeller shaft. Adhesion and coating of strain gauges were studied and it was made clear that epoxy type adhesive for strain gauge adhesion and the coating by rubber type bond are best. The flexibility of the rubber type bond is especially effective to overcome the cracks in the coating even after drying. Stress measurement is conducted under the stational sea-going condition and the crash astern test. The obtained records at these tests are shown. According to these records, the double amplitude of oscillating stress of the blades is in the same extent as the mean stress.
社団法人日本船舶海洋工学会の論文
1971-09-30