High-precision balance for measuring resistance of water tunnel

Abstract

The invention discloses a high-precision balance for measuring the resistance of a water tunnel, which comprises a balance bracket, an elastic deformation girder, a rigid connecting bracket, a non-magnetic beam, a magnetic telescopic displacement sensor, a magnetic needle and a sensor-mounting bracket. The resistance-measuring balance bracket and the sensor-mounting bracket are connected with a water tunnel cover plate, an M20 external bolt at the right end of the elastic deformation girder penetrates through a Phi 20 through hole on the balance bracket and fastened and connected by an M20 nut, the rigid connecting bracket and the elastic deformation girder are connected by two M6 bolts, and the magnetic needle is inlaid in a small hole at the left end of the non-magnetic beam in an interference way. The displacement of the small magnetic needle is measured by magnetic telescopic displacement sensor to indirectly measure the resistance of a water tunnel experimental model, and the high-precision balance for measuring the resistance of a water tunnel measures has the advantages of simple structure and high precision and can be widely applied to resistance comparison experiments of water tunnels.

Description

technical field [0001] The invention relates to a device for measuring fluid resistance, in particular to a high-precision water tunnel resistance measuring balance. Background technique [0002] At present, the conventional method used in fluid dynamic experiments is to use balance measurement, which can be divided into mechanical balance and strain balance according to its working principle. [0003] The mechanical balance is composed of a model support system, a model attitude mechanism, a force and moment decomposition mechanism, a force transmission system, a balance measuring element, a carriage and a balance measurement control system. It decomposes and transmits force through the mechanical components on the balance, and uses mechanical balance elements or force sensors to measure the hydrodynamic load acting on the model. The mechanical balance has a wide load measurement range, and at the same time can decompose the fluid dynamics on the model, and each measuring ...

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Problems solved by technology

Strain balance has the advantages of light weight, fast response, and simple design and processing, but this kind of balance has high requirements for environmental factors such as temperature and humidity. In water tunnel experiments, its accuracy is greatly affected by ambient temperature and humidity.

[0005] In the existing fluid resistance experiments in water tunnels, a four-component force balance is usually used. Although this force-measuring balance has a wide load measurement range and can measure several component forces at the same time, due to the influence of the environment, its accuracy cannot reach Require

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