APPARATUS FOR MEASURING ROTATION VELOCITY AND METHOD OF MEASURING ROTATION VELOCITY AND WIND TUNNEL TESTING MACHINE HAVING RATUS FOR MEASURING ROTATION VELOCITY

摘要

PURPOSE: A wind tunnel testing apparatus including a rotation number measuring apparatus, a dual mode rotation number measuring method and a dual mode rotation number measuring apparatus is provided to measure the rotation number of a rotator which rotates more slowly than a first cycle speed, measure the distance between the rotator and the rotation number measuring apparatus in real time by a distance measuring sensor, and continuously record the dynamic balancing characteristic of the rotator, thereby improving the rotational stability of the rotator. CONSTITUTION: A rotation number measuring apparatus(500) includes first and second sensors(521,522) which are formed on the inner peripheral surface of a rotator(11), outputting signals by sensing rotation of the rotator and outputting first and second measurement data forming a 90 degree phase difference, a reflection bushing(510) forming a first and second patterns(511, 512) having different reflectivity on the inner peripheral surface, a holder(525) in which the first and second sensors are mounted by being separated from the reflection bushing, a sensing unit including a distance measuring sensor(526) for measuring the distance between the holder and the rotator, a circuit unit converting the first and second measurement data into digital signals and outputting the digital signals, and a processing unit calculating the rotational numbers of the rotator according to the digital signals. [Reference numerals] (AA) Circuit unit; (BB) Processing unit; (CC) Wind tunnel testing data storage system;