Device for measuring rotational inertia of revolving body

Abstract

The invention relates to a device for measuring the rotational inertia of a revolving body. According to the invention, a buoy is connected with a stay wire, and the lower part of the stay wire is connected with a balancing weight. When the balancing weight falls freely, the buoy moves downwards along with the stay wire, and passes by the positions of two photoelectric sensors. During measurement, the balancing weight is placed above the photoelectric sensors, and the photoelectric sensors are triggered through the buoy above the balancing weight. The photoelectric sensors are fixed on a photoelectric sensor support through screws, and the photoelectric sensor support consists of two parts, wherein the central part is connected through a screw. A support consists of four L-shaped pipes and a main support, and is connected and fixed through a screw. The device irons out the defects that many rotational inertia measurement instruments employing the modes of contact friction and multiple clamping are lower in measurement precision, are poor in stability, are complex and tedious in testing process, and are not safe and convenient for use. The device is simple in structure, is low in cost, is easy to operate, is not high in major requirements, is not complex in calculation, and is high in measurement precision.

Description

technical field [0001] The invention belongs to the technical field of moment of inertia testing, in particular to a measuring device for moment of inertia of a rotating body. Background technique [0002] The moment of inertia of an object is an important technical parameter in the design of a motion system. The measurement of moment of inertia is used in mechanical fields such as aircraft, automobiles, mechanical parts, and motor rotors. There are two test methods for moment of inertia: calculation method and experimental method. There are four traditional methods for testing the moment of inertia: falling body method; torsional vibration method; three-line pendulum method and compound pendulum method. Both take time as the measured quantity, and apply the theoretical formula to find the moment of inertia. [0003] Before the present invention, there are currently such as NB series moment of inertia testers that can measure miniature projectiles, auto parts, motor rotors...

AI Technical Summary

Problems solved by technology

[0003] Before the present invention, there are currently such as NB series moment of inertia testers that can measure miniature projectiles, auto parts, motor rotors, missile fins (fan blades), human bodies, large missiles, satellites, ship model aircraft, and aerospace vehicles. From a few grams to tens of tons, the accuracy of the instrument is 0.5%; another example is that the mass characteristic parameter measurement equipment can measure a maximum mass of 1500kg, and the measurement uncertainty of the moment of inertia is less than 0.3%; On the basis of the double-sided vertical dynamic balancing machine, a torsion-type moment of inertia test bench is configured. The maximum mass that can be measured is 1000kg, and the measurement uncertainty of the moment of inertia is less than 0.5%. 0.5%, and the measurement accuracy of the moment of inertia is better than 2%. The above-mentioned devices are often expensive and complicated to operate, and are not suitable for ordinary companies.

There are also some manufacturers who have developed moment of inertia measuring instruments, which mostly use contact friction and multiple clamping methods. To varying degrees, there are low measurement accuracy, poor stability, complicated and cumbersome testing process, unsafe and inconvenient use, etc.

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