A temperature correction method for the rod-type bellows balance formula

Abstract

A temperature correction method for a rod-type bellows balance formula belongs to the field of dynamic measurement technology for aerospace force measurement tests. The present invention solves the problem of correcting the measurement error of a balance affected by temperature due to factors such as different thermal expansion coefficients of materials and large structural differences between the bellows and the balance. The present application can obtain the temperature correction coefficient of each component of the strain balance by using a balance calibration device and temperature-controlled heating on the basis of the relevant requirements for the temperature detection of the balance bridge assembly, the rod-type bellows balance elastic element and the bellows cover, and correct the original balance data collected by the force measurement wind tunnel test, thereby achieving the purpose of temperature correction of the rod-type bellows balance formula.

Description

Technical Field

[0001] The invention belongs to the technical field of dynamic measurement of aerospace force measurement tests, and in particular relates to a temperature correction method for a rod-type bellows balance formula. Background Art

[0002] The rod-type six-component balance used in wind tunnel force measurement tests can directly measure the aerodynamic force and torque acting on the aviation model, and is one of the most critical high-precision sensors in force measurement wind tunnel tests. For certain types of wind tunnel tests, such as internal flow resistance force measurement wind tunnel tests, a rod-type bellows balance is used, that is, a bellows sealing cover device is set outside the conventional rod-type six-component balance. Using the sealing principle, the bellows can effectively isolate the pressure fluctuations in the wind tunnel flow field. Usually, the bellows and the balance are made of different materials and have very different structures. When affected by the temperature of the wind tunnel flow field, an obvious temperature gradient will be generated. This temperature gradient not only causes the zero-point temperature effect and sensitivity temperature effect of the balance, but also affects the accurate measurement of the balance due to factors such as different thermal expansion coefficients of the materials between the bellows and the balance and large structural differences.

[0003] At present, there are few research and development technologies for temperature correction methods for rod-type bellows balance formulas. Usually, only zero-point temperature compensation and sensitivity temperature compensation are performed on the balance itself, while no temperature correction is performed on the rod-type bellows balance. In particular, due to factors such as the different thermal expansion coefficients of the materials between the bellows protective cover and the balance and the large structural differences, the balance formula is affected by temperature and has errors, which have not been systematically corrected.

[0004] Publication number CN114674520A discloses a sensitivity temperature effect correction method for a force measuring wind tunnel test strain balance, which is aimed at correcting the temperature sensitivity of the balance itself. Publication numbers CN104849019A, CN111638034A and CN109000879A all solve the problem of zero-point temperature effect of the strain balance caused by uneven temperature distribution. Among them, CN104849019A adopts a method of independently bridging each elastic element and then combining the two bridges in parallel to eliminate the large zero-point temperature output caused by the mutual influence of temperature stress caused by the structure; CN109000879A fits the temperature data obtained in the ground temperature test and the wind tunnel test to obtain a curve of the change of the unloaded reading of the balance during a certain test, that is, the initial reading with the characteristic temperature of the balance, thereby achieving the purpose of correcting the temperature drift of the balance. In addition, CN103625655A and CN112577704A have formed the calibration capability of the temperature effect of the wind tunnel balance under a constant temperature environment through the construction of hardware equipment. The above patents are all for zero point temperature correction and sensitivity temperature correction of a single structural element of the balance itself, and do not solve the problem that the balance formula has errors due to the different thermal expansion coefficients and large structural differences between the bellows protective cover and the balance due to the influence of temperature. Summary of the invention

[0005] In order to solve the problem in the prior art that the bellows protective cover and the balance have different thermal expansion coefficients and large structural differences, which leads to errors in the balance formula due to the influence of temperature, the present invention provides the following solution:

[0006] A temperature correction method for a rod-type bellows balance formula, the method comprising:

[0007] Step 1: Paste a strain gauge on the balance elastic element of the rod-type bellows balance to be corrected to form a Wheatstone measuring bridge, and paste a temperature sensor on the balance elastic element and the bellows protective cover respectively; perform zero point temperature compensation on the balance;

[0008] Step 2: installing the rod-type bellows balance on a balance calibration device, and installing a temperature-controllable heating device on the model end of the rod-type bellows balance to simulate the heat flow in the test, and obtain the temperature gradients of different balance elastic elements and bellows protective covers;

[0009] Step 3: calibrate the balance for the temperature gradients of the different balance elastic elements and the bellows protective cover respectively, and obtain the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance, the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the working formula of the rod-type bellows balance;

[0010] Step 4: According to the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance, the original data of the Wheatstone measuring bridge collected from the force measuring wind tunnel test is corrected, and the aerodynamic load data of the aircraft model in the force measuring wind tunnel test is obtained through the working formula of the rod-type bellows balance.

[0011] Furthermore, the specific implementation process of step 1 is as follows:

[0012] Step 1.1: Set the corresponding Wheatstone measuring bridge according to the number of measuring components of the rod-type bellows balance. Each strain gauge in each Wheatstone measuring bridge is pasted on the same section of the balance temperature transfer path;

[0013] Step 1.2: The temperature sensor is attached to the front and rear elastic elements of the rod-type bellows balance, and the front and rear end surfaces of the bellows protective cover;

[0014] Step 1.3: Perform zero point temperature compensation on the rod-type bellows balance.

[0015] Furthermore, the specific implementation process of step three is as follows:

[0016] Step 3.1: Under a normal temperature and stable environment, perform a first static performance calibration on the rod-type bellows balance according to a calibration load table, collect the outputs of the Wheatstone measuring bridge and the temperature sensor, and thereby obtain loading data and a working formula of the rod-type bellows balance under normal temperature calibration conditions;

[0017] Step 3.2: heating the model end of the rod-type bellows balance to set a target temperature;

[0018] Step 3.3: When the bellows protective cover generates a temperature gradient, but the balance elastic element has no temperature gradient, a second load is applied to the rod-type bellows balance according to the same calibration load table as step 3.1, and the outputs of the Wheatstone measuring bridge and the temperature sensor are collected to obtain the loading data under the first uneven temperature distribution condition;

[0019] Step 3.4: When the balance elastic element generates a temperature gradient, stop heating, wait until the bellows protective cover drops to room temperature, and when the balance elastic element still has a temperature gradient, perform a third load on the rod-type bellows balance according to the same calibration load table as step 3.1, collect the outputs of the Wheatstone measuring bridge and the temperature sensor, and obtain the loading data under the second uneven temperature distribution condition;

[0020] Step 3.5: Use the mixed multivariate method to calibrate the Wheatstone measuring bridge of the rod-type bellows balance loaded on the load table and the output data of the temperature sensor under various temperature conditions, and process and calculate to obtain the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance.

[0021] Furthermore, in step 3.5, the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance are calculated by:

[0022] K Ui 天平 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T i天平加温 -T i天平校准 );

[0023] K Ui波纹管 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T 波纹管加温 -T 波纹管校准 );

[0024] Get, where K Ui天平 is the correction factor for the balance temperature effect per Wheatstone measuring bridge of a rod-type bellows balance, K Ui波纹管 is the correction factor for the bellows temperature effect for each Wheatstone measuring bridge of a rod-type bellows balance, U i加温 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under the condition of uneven temperature distribution, U i加温零点 is the output value of each Wheatstone measuring bridge of the zero-loaded rod bellows balance under the condition of uneven temperature distribution, U i校准 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under normal temperature calibration conditions, U i校准零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance under zero-load calibration conditions at room temperature, T i天平加温 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under the condition of uneven temperature distribution, T i天平校准 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions, T 波纹管加温 is the output value of the bellows temperature sensor under the condition of uneven temperature distribution, T波纹管校准 It is the output value of the bellows temperature sensor under normal temperature calibration conditions.

[0025] Furthermore, the specific implementation process of step 4 is as follows:

[0026] Step 4.1: Correct the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the dynamometer wind tunnel test by using the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance;

[0027] Step 4.2: Perform addition and subtraction combinations on the output value of the Wheatstone measuring bridge corrected in step 4.1 to obtain the voltage change corresponding to each component load of the rod-type bellows balance, and use the working formula of the rod-type bellows balance to calculate the aerodynamic load data of the aircraft model in the force measurement wind tunnel test.

[0028] Furthermore, in step 4.1, each Wheatstone measuring bridge output value of the rod-type bellows balance collected in the force measurement wind tunnel test is measured by:

[0029] U i风洞修正 =(U i风洞 -U i风洞零点 ) / [1+K Ui天平 ×(T i风洞 -T i天平校准 )+K Ui 波纹管 ×(T i风洞 -T i天平校准 )]+U i风洞零点；

[0030] Correction, where U i风洞修正 It is the value after the sensitivity temperature effect correction is made to the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test. i风洞 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test, U i风洞零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test without wind, K Ui天平 is the balance temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, K Ui波纹管 is the bellows temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, T i风洞 is the temperature sensor output value corresponding to each Wheatstone measuring bridge collected during the wind tunnel test, T i校准 It is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions.

[0031] The present invention has the following beneficial effects:

[0032] The existing technical solutions can only perform zero point temperature compensation and sensitivity temperature compensation on the balance itself. The present invention can solve the problem of correcting the measurement error of the balance affected by temperature due to factors such as different material thermal expansion coefficients and large structural differences between the bellows and the balance, thereby ensuring the accuracy of aerodynamic data testing in wind tunnel tests of rod-type bellows balances. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the assembly of a rod-type bellows balance;

[0034] Figure 2 This is a schematic diagram of the temperature sensor being pasted on the bellows;

[0035] Figure 3 It is a schematic diagram of the temperature sensor on the balance and the U1 and U2 bridge strain gauges;

[0036] Figure 4 This is the schematic diagram of the U1 Wheatstone measurement bridge;

[0037] Figure 5 This is the schematic diagram of the U2 Wheatstone measurement bridge;

[0038] Figure 6 This is a graph showing the change in balance accuracy with temperature;

[0039] In the figure: 1-balance, 2-bellows, 3-temperature sensor, 31-first temperature sensor, 32-second temperature sensor, 33-third temperature sensor, 34-fourth temperature sensor, 35-fifth temperature sensor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0041] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Embodiment 1, combination Figure 1-Figure 6 This embodiment is described. This embodiment is a temperature correction method for a rod-type bellows balance formula. The equipment used includes a balance 1, a bellows protective cover 2, a temperature sensor 3 and other components. The balance 1 and the bellows protective cover 2 are attached with a first temperature sensor 31, a second temperature sensor 32, a third temperature sensor 33, a fourth temperature sensor 34 and a fifth temperature sensor 35, which are used to measure the real-time temperature of the balance 1 and the bellows protective cover 2. The specific correction method is as follows:

[0044] Step 1: Paste strain gauges on the elastic element of balance 1 to form a Wheatstone measuring bridge. In order to reduce the influence of temperature effect, each strain gauge in each Wheatstone measuring bridge of balance 1 is pasted on a cross section of the temperature transfer path of the balance. The corresponding Wheatstone measuring bridge is set according to the number of measurement components of the balance.

[0045] Step 2: Temperature sensors are installed at the front, middle and rear elastic elements of the balance and the front and rear end surfaces of the bellows to realize scale monitoring;

[0046] Step 3: Perform zero point temperature compensation on the balance in the same way as the conventional method;

[0047] Step 4: Install the rod-type bellows balance on a balance calibration device, and install a temperature-controllable heating device on the balance model end to simulate the heat flow in the test;

[0048] Step 5: Under normal temperature and stable temperature environment, perform the first static performance calibration of the rod-type bellows balance according to the calibration load table, collect the output of the Wheatstone measuring bridge and the temperature sensor of the rod-type bellows balance, so as to obtain the loading data and working formula of the rod-type bellows balance under normal temperature calibration conditions;

[0049] Step 6: Heat the balance model end and set the target temperature;

[0050] Step 7: When the bellows protective cover generates a temperature gradient, but the balance elastic element has no temperature gradient, a second load is applied to the rod-type bellows balance according to the same calibration load table as in step 5, and the outputs of the Wheatstone measuring bridge and the temperature sensor of the rod-type bellows balance are collected to obtain the loading data under the first uneven temperature distribution condition;

[0051] Step 8: When the balance elastic element generates a temperature gradient, stop heating, wait until the bellows protective cover drops to room temperature, and when the balance elastic element still has a temperature gradient, perform a third load on the rod-type bellows balance according to the same calibration load table as step 5, collect the output of the rod-type bellows balance Wheatstone measuring bridge and the temperature sensor, and obtain the loading data under the second uneven temperature distribution condition;

[0052] Step nine: Use the mixed multivariate method to calibrate the output data of the Wheatstone measuring bridge of the rod-type bellows balance loaded on the load table and the temperature sensor under various temperature conditions, and process and calculate to obtain the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance.

[0053] K Ui 天平 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T i天平加温 -T i天平校准 );

[0054] K Ui波纹管 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T 波纹管加温 -T 波纹管校准 );

[0055] Among them, K Ui天平 is the correction factor for the balance temperature effect per Wheatstone measuring bridge of a rod-type bellows balance, K Ui波纹管 is the correction factor for the bellows temperature effect for each Wheatstone measuring bridge of a rod-type bellows balance, U i加温 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under the condition of uneven temperature distribution, U i加温零点 is the output value of each Wheatstone measuring bridge of the zero-loaded rod bellows balance under the condition of uneven temperature distribution, U i校准is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under normal temperature calibration conditions, U i校准零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance under zero-load calibration conditions at room temperature, T i天平加温 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under the condition of uneven temperature distribution, T i天平校准 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions, T 波纹管加温 is the output value of the bellows temperature sensor under the condition of uneven temperature distribution, T 波纹管校准 It is the output value of the bellows temperature sensor under normal temperature calibration conditions.

[0056] Step 10: Correct the original data of the Wheatstone measuring bridge collected in the force measuring wind tunnel test, and use the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 9 to correct the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the force measuring wind tunnel test. Add and subtract the corrected Wheatstone measuring bridge values ​​to obtain the voltage change corresponding to each component load of the rod-type bellows balance, and use the working formula of the rod-type bellows balance obtained in step 5 to calculate the aerodynamic load data of the aircraft model in the force measuring wind tunnel test. Specifically, the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the force measuring wind tunnel test is obtained by:

[0057] U i风洞修正 =(U i风洞 -U i风洞零点 ) / [1+K Ui天平 ×(T i风洞 -T i天平校准 )+K Ui 波纹管 ×(T i风洞 -T i天平校准 )]+U i风洞零点；

[0058] Correction, where U i风洞修正 It is the value after the sensitivity temperature effect correction is made to the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test. i风洞 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test, U i风洞零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test without wind, K Ui天平 is the balance temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, K Ui波纹管is the bellows temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, T i风洞 is the temperature sensor output value corresponding to each Wheatstone measuring bridge collected during the wind tunnel test, T i校准 It is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions.

[0059] pass Figure 6 It can be seen that the correction method has a significant effect on improving the accuracy of the balance.

[0060] This embodiment is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A temperature correction method for a rod-type bellows balance formula, characterized in that: The method comprises: Step 1: Paste a strain gauge on the balance elastic element of the rod-type bellows balance to be corrected to form a Wheatstone measuring bridge, and paste a temperature sensor on the balance elastic element and the bellows protective cover respectively; perform zero point temperature compensation on the balance; Step 2: installing the rod-type bellows balance on a balance calibration device, and installing a temperature-controllable heating device on the model end of the rod-type bellows balance to simulate the heat flow in the test, and obtain the temperature gradients of different balance elastic elements and bellows protective covers; Step 3: calibrate the balance for the temperature gradients of the different balance elastic elements and the bellows protective cover respectively, and obtain the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance, the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the working formula of the rod-type bellows balance; Step 4: According to the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance, the original data of the Wheatstone measuring bridge collected from the force measuring wind tunnel test is corrected, and the aerodynamic load data of the aircraft model in the force measuring wind tunnel test is obtained through the working formula of the rod-type bellows balance.

2. A temperature correction method for a rod-type bellows balance formula according to claim 1, characterized in that: The specific implementation process of step 1 is as follows: Step 1.1: Set the corresponding Wheatstone measuring bridge according to the number of measuring components of the rod-type bellows balance. Each strain gauge in each Wheatstone measuring bridge is pasted on the same section of the balance temperature transfer path; Step 1.2: The temperature sensor is attached to the front and rear elastic elements of the rod-type bellows balance, and the front and rear end surfaces of the bellows protective cover; Step 1.3: Perform zero point temperature compensation on the rod-type bellows balance.

3. The temperature correction method of the rod-type bellows balance formula according to claim 1 is characterized in that: The specific implementation process of step three is as follows: Step 3.1: Under a normal temperature and stable environment, perform a first static performance calibration on the rod-type bellows balance according to a calibration load table, collect the outputs of the Wheatstone measuring bridge and the temperature sensor, and thereby obtain loading data and a working formula of the rod-type bellows balance under normal temperature calibration conditions; Step 3.2: heating the model end of the rod-type bellows balance to set a target temperature; Step 3.3: When the bellows protective cover generates a temperature gradient, but the balance elastic element has no temperature gradient, a second load is applied to the rod-type bellows balance according to the same calibration load table as step 3.1, and the outputs of the Wheatstone measuring bridge and the temperature sensor are collected to obtain the loading data under the first uneven temperature distribution condition; Step 3.4: When the balance elastic element generates a temperature gradient, stop heating, wait until the bellows protective cover drops to room temperature, and when the balance elastic element still has a temperature gradient, perform a third load on the rod-type bellows balance according to the same calibration load table as step 3.1, collect the outputs of the Wheatstone measuring bridge and the temperature sensor, and obtain the loading data under the second uneven temperature distribution condition; Step 3.5: Use the mixed multivariate method to calibrate the Wheatstone measuring bridge of the rod-type bellows balance loaded on the load table and the output data of the temperature sensor under various temperature conditions, and process and calculate to obtain the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance.

4. A temperature correction method for a rod-type bellows balance formula according to claim 3, characterized in that: In step 3.5, the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance are calculated by: K Ui天平 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T i天平加温 -T i天平校准 ) K Ui波纹管 =[(U i加温 -U i加温零点 )-(U i校准 -U i校准零点 )] / (U i校准 -U i校准零点 ) / (T 波纹管加温 -T 波纹管校准 ) Get, where K Ui天平 is the correction factor for the balance temperature effect per Wheatstone measuring bridge of a rod-type bellows balance, K Ui波纹管 is the correction factor for the bellows temperature effect for each Wheatstone measuring bridge of a rod-type bellows balance, U i加温 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under the condition of uneven temperature distribution, U i加温零点 is the output value of each Wheatstone measuring bridge of the zero-loaded rod bellows balance under the condition of uneven temperature distribution, U i校准 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance after loading under normal temperature calibration conditions, U i校准零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance under zero-load calibration conditions at room temperature, T i天平加温 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under the condition of uneven temperature distribution, T i天平校准 is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions, T 波纹管加温 is the output value of the bellows temperature sensor under the condition of uneven temperature distribution, T 波纹管校准 It is the output value of the bellows temperature sensor under normal temperature calibration conditions.

5. A temperature correction method for a rod-type bellows balance formula according to claim 4, characterized in that: The specific implementation process of step 4 is as follows: Step 4.1: Correct the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the dynamometer wind tunnel test by using the balance temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance and the bellows temperature effect correction coefficient of each Wheatstone measuring bridge of the rod-type bellows balance; Step 4.2: Perform addition and subtraction combinations on the output value of the Wheatstone measuring bridge corrected in step 4.1 to obtain the voltage change corresponding to each component load of the rod-type bellows balance, and use the working formula of the rod-type bellows balance to calculate the aerodynamic load data of the aircraft model in the force measurement wind tunnel test.

6. A temperature correction method for a rod-type bellows balance formula according to claim 5, characterized in that: In step 4.1, the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test is measured by: U i风洞修正 = (U i风洞 - U i风洞零点 ) / [1 + K Ui天平 × (T i风洞 - T i天平校准 ) + K Ui波纹管 × (T i风洞 - T i天平校准 )] + U i风洞零 point Correction, where U i风洞修正 It is the value after the sensitivity temperature effect correction is made to the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test. i风洞 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test, U i风洞零点 is the output value of each Wheatstone measuring bridge of the rod-type bellows balance collected in the wind tunnel test without wind, K Ui天平 is the balance temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, K Ui波纹管 is the bellows temperature effect correction factor for each Wheatstone measuring bridge of the rod-type bellows balance obtained in step 3.4, T i风洞 is the temperature sensor output value corresponding to each Wheatstone measuring bridge collected during the wind tunnel test, T i校准 It is the temperature sensor output value corresponding to each Wheatstone measurement bridge under normal temperature calibration conditions.

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