Wind tunnel balance temperature drift physical compensation method
A technology of temperature compensation and temperature drift, which is applied in the testing of machines/structural components, instruments, measuring devices, etc., which can solve the problems of different temperature gradients and temperature drift, inability to cope with nonlinear temperature characteristics, and low efficiency
Active Publication Date: 2021-08-31
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology
In this method, determining the length of the temperature compensation wire is the key. Usually, it is calculated by qualitative formula. It is necessary to repeat the ground temperature test many times before it is possible to control the temperature drift of the balance under the condition of the ground temperature test box within the required range. , so the method is not efficient
Moreover, the traditional temperature compensation is only suitable for the case where the temperature characteristic of the bridge is linear or close to linear, and cannot deal with the case where the temperature characteristic is nonlinear. prone to non-linearity
In addition, the ambient temperature in the ground temperature test chamber is more uniform than that in the wind tunnel, and the temperature change of the balance body is significantly different under the ground temperature test chamber and the wind tunnel test conditions, resulting in the temperature difference between the two conditions. The temperature drift caused by the gradient is different, and the traditional temperature compensation method cannot effectively solve the temperature drift caused by the temperature gradient in the wind tunnel test
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Embodiment 1
[0108] For example figure 2 Wheatstone bridge Mz on the balance shown, according to figure 2 In the position shown, the first temperature sensor 5 is pasted next to the first strain gauge 1, the second temperature sensor 6 is pasted next to the second strain gauge 2, and the third temperature sensor 7 is pasted next to the third strain gauge 3, Paste the fourth temperature sensor 8 next to the fourth strain gauge 4. In this example, all four temperature sensors use pt100 thermal resistance;
[0109] Put the balance into the ground temperature test box, start to heat up from room temperature until the temperature of the first temperature sensor 5 reaches 70°C, and keep it warm for 3 hours; during the heating and heat preservation period, at intervals of 2 seconds, simultaneously collect the resistance of each strain gauge. Value data and temperature data of the corresponding temperature sensor;
[0110] The change of the resistance value of each strain gauge with the change...
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The invention belongs to the technical field of aerospace force test aerodynamic force measurement, and particularly relates to a wind tunnel balance temperature drift physical compensation method, which comprises the following steps of: pasting a corresponding temperature sensor beside each strain gauge for any one Wheatstone bridge on a balance; obtaining the temperature characteristic of each strain gauge by using a ground temperature experiment box; connecting temperature compensation wires with different lengths in series to each strain gauge to form different temperature compensation schemes, iteratively screening the optimal temperature compensation scheme, and carrying out temperature compensation on each strain gauge according to the scheme to form a Wheatstone bridge; and finally, checking the compensation effect by using the ground temperature experiment box.
Description
technical field [0001] The invention belongs to the technical field of aerodynamic force measurement in aerospace dynamometer tests, and in particular relates to a physical compensation method for wind tunnel balance temperature drift. Background technique [0002] Balance temperature effect means that due to the influence of temperature, in addition to the output caused by force / torque, the output of the balance is also mixed with the output caused by temperature. These two outputs cannot be effectively separated, thus affecting the measurement accuracy of the balance. Balance temperature drift is an important form of balance temperature effect. The temperature drift of the balance refers to the phenomenon that the output of the balance bridge circuit changes simply due to temperature changes when the balance is under constant load. There are two main reasons for the temperature drift of the balance: on the one hand, during the wind tunnel test of the balance, the temperat...
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IPC IPC(8): G01M9/06
CPCG01M9/062
Inventor 马涛王树民向光伟易国庆徐志伟潘华烨苗磊尹敏杨浩康凯刘文华
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT