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Paddle strain gauge arranging and decoupling method

A technology of strain gauges and blades, applied in the field of helicopter structural testing, can solve problems such as insufficient timeliness, achieve the effects of saving workload, improving work efficiency, and reducing processing workload

Active Publication Date: 2015-05-27
CHINA HELICOPTER RES & DEV INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The patch technology and physical decoupling method introduced in this patent overcome the shortcomings of the lack of timeliness of the commonly used analytical decoupling method, and can obtain the swinging and shimmy strains in a timely and accurate manner. The measured values ​​at this time (or ) is the real swinging strain (or shimmy strain), which brings great convenience to the timely judgment of the test flight or measurement site

Method used

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  • Paddle strain gauge arranging and decoupling method

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Embodiment 1

[0045] Below with the certain helicopter rotor blade of load test as example, describe the present invention in detail:

[0046] The first step is to paste 5 strain gauges on the section of the tested blade, such as figure 1 shown. Wherein, the first strain gauge 1 and the second strain gauge 2 are attached to the leading edge of the tested blade, and the third strain gauge 3, the fourth strain gauge 4 and the fifth strain gauge 5 are attached to the trailing edge of the tested blade, All five strain gauges should be attached to the same material of the tested blade;

[0047] In the second step, the flapping moment M is applied to the section of the tested blade 挥 =20kg×3490mm, the measured strain values ​​of the five strain gauges are ε 挥1 , ε 挥2 , ε 挥3 , ε 挥4 and ε 挥5 , see Table 1 for specific data, and calculate: See Table 3 for specific data;

[0048] Table 1: Output values ​​of each strain gauge with a swinging load applied

[0049]

[0050] The third step ...

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Abstract

The invention belongs to the technical field of a helicopter structure test and relates to a strain gauge arranging and decoupling method for asymmetrical structures of a helicopter rotor paddle (including a tail paddle) and the like, which is widely suitable for load test work for asymmetrical structures (for example an air blower blade, a turbine blade and the like) of other industries. The gauge arranging technology and the physical decoupling method disclosed by the invention overcome the defect that a common analyzing and decoupling method is insufficient in timeliness, can timely and accurately obtain swing and shimmy strains, the measured value is the true swing strain (or shimmy strain), so that great convenience is brought to a test flight or a measuring site as well as timely judgment. Moreover, in practical load measuring, compared with the technology in the invention and a conventional strain gauge arranging technology and analyzing and decoupling method, the processing workload for the test data is relatively less, namely the data processing workload can be saved through the gauge arranging technology and the physical decoupling method, and the working efficiency is improved.

Description

technical field [0001] This patent belongs to the technical field of helicopter structural testing, and involves strain gauge arrangement and decoupling methods for asymmetric structures such as helicopter rotor blades (including tail rotor blades), and is also widely applicable to asymmetric structures in other industries (such as fan blades, turbine blades, etc. blades, etc.) load test work. Background technique [0002] Rotor load measurement is an important work link in the process of helicopter development. In order to evaluate the strength and fatigue life of the blade, it is necessary to measure the load on the blade in the flight test or test environment; and in order to measure the load on the blade, it is usually necessary to attach a strain gauge to the blade, and to Due to the asymmetrical characteristics of the section of the helicopter rotor blade, especially the composite material blade widely used today, when actually studying the load and deformation, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64F5/00B64F5/60
Inventor 余洵徐晋锋姚顺华
Owner CHINA HELICOPTER RES & DEV INST
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