A device for checking the influence of manufacturing errors on pressure measuring areas on the surface of an aircraft

Abstract

An apparatus for checking the effect of manufacturing errors on a pressure-measuring area of an aircraft surface includes a base; a plurality of supports fixedly coupled to the base; a platform plate supported by the supports and including a flat portion and an edge, the flat portion including a test area; and simulation components removably installed in the test area of the platform plate, wherein the edge of the platform plate is designed as an airfoil edge.

Description

Technical Field

[0001] This invention belongs to the field of aircraft air data system technology, and specifically relates to a test device for verifying the influence of manufacturing errors in key pressure measurement areas on the surface of an aircraft. Background Technology

[0002] The critical pressure measurement areas on an aircraft surface typically include total hydrostatic probes and hydrostatic orifices. By converting the data obtained from these areas, key flight parameters such as Mach number, total pressure, and static pressure can be obtained. The accuracy of these measurements directly affects the accuracy of the aircraft's altitude data. In actual aircraft manufacturing, manufacturing deviations such as waviness, steps, and probe mounting angles can occur in these critical pressure measurement areas, thus affecting altitude measurements.

[0003] As important sensors in the aircraft's air data system, the total hydrostatic probe and hydrostatic orifice require analysis and evaluation of manufacturing errors after installation to compensate for and correct positional errors at their installation location on the aircraft.

[0004] Currently, commonly used methods for assessing manufacturing deviations in critical pressure measurement areas on aircraft surfaces include flight testing, simulation analysis, and wind tunnel testing. Among these methods, flight testing is an effective way to assess the installation error of total hydrostatic probes, but it is costly and time-consuming. Simulation analysis using methods such as computational fluid dynamics (CFD) is also an effective and economical method for assessing probe installation deviations. However, in civil aircraft airworthiness certification, examiners currently require aircraft manufacturers to conduct wind tunnel tests to verify CFD assessment methods in order to obtain more accurate assessments.

[0005] Therefore, it is necessary to design a device to verify manufacturing deviations in critical pressure measurement areas on the surface of an aircraft used for wind tunnel testing. Summary of the Invention

[0006] In order to verify the manufacturing deviations of key pressure measurement areas on the aircraft surface used for wind tunnel testing, this invention designs a device for verifying the influence of errors. This device can simulate manufacturing deviations (wrinkle, probe step difference, probe angle of attack, etc.) in key pressure measurement areas on the aircraft surface in a wind tunnel, thereby obtaining the influence of manufacturing deviations on static pressure measurement.

[0007] Specifically, this device for verifying the influence of errors includes: a base; multiple supports fixedly connected to the base; a platform plate supported by the supports and comprising a flat portion and edges, the flat portion including the test area; and simulation components detachably mounted in the test area of ​​the platform plate, wherein the edges of the platform plate are designed as airfoil edges. The edges of the platform plate adopt a high-speed airfoil nose design, which gives the upper and lower surfaces of the platform plate good aerodynamic characteristics, while the flat portion of the platform plate results in a relatively flat pressure distribution in the central part of the test area, with no pressure gradient in the downstream direction, and manufacturing errors are not affected by other interfering factors when studied in this area.

[0008] In an embodiment of the invention, the simulation assembly includes a corrugated plate assembly and a probe assembly. The corrugated plate assembly is configured to simulate the effect of waviness on surface pressure distribution, and the probe assembly is configured to simulate the effect of manufacturing deviations on static pressure measurement. Either the corrugated plate assembly or the probe assembly is detachably mounted in the test area of ​​the platform plate.

[0009] In an embodiment of the present invention, the corrugated plate assembly includes a corrugated plate base and a corrugated plate component. The corrugated plate base is detachably mounted in the test area of ​​the platform plate, and the corrugated plate component is detachably mounted on the corrugated plate base.

[0010] In an embodiment of the invention, the probe assembly includes a base, a turntable, a corrugated plate component, and a probe. The base is detachably mounted on a platform plate, the turntable is rotatably mounted on the base, the corrugated plate component is detachably mounted on the base, and the probe is detachably mounted on the turntable. The turntable can rotate to simulate different angles of attack of the probe.

[0011] Preferably, the corrugated plate component comprises multiple corrugated plates, each with different specifications. During testing, corrugated plates of different specifications can be replaced to simulate the effect of waviness on surface pressure distribution.

[0012] Preferably, the probe assembly also includes multiple gaskets, each with different specifications, wherein one of the gaskets is selected to be mounted on the turntable before probe installation. The step difference between the total hydrostatic probe and the platform plate can be adjusted by changing the gasket of different specifications on the turntable to simulate the step effect of the probe.

[0013] In a preferred embodiment, the test area is located at the central portion of the platform plate.

[0014] In a preferred embodiment, the test area includes a stepped section to support the simulation component.

[0015] In an embodiment of the present invention, the support includes three pairs of support members, wherein two pairs of support members are used to support the platform plate, and the other pair of support members is disposed between the two pairs of support members for the routing of the pressure measuring pipeline.

[0016] Additional features and advantages of the apparatus for verifying the effects of errors will be set forth in the detailed description below, and will be recognized by those skilled in the art from the following description or from practice of the embodiments described herein, including the detailed description below and the accompanying drawings. Attached Figure Description

[0017] With reference to the above objectives, the technical features of the present invention are clearly described in the following claims, and its advantages will be apparent from the following detailed description with reference to the accompanying drawings, which illustrate preferred embodiments of the invention by way of example, without limiting the scope of the inventive concept.

[0018] Figure 1 A perspective view of an apparatus for verifying the effects of errors according to an embodiment of the present invention is shown, the apparatus being equipped with a corrugated plate assembly; Figure 2 It shows Figure 1 The front sectional view of the device used to verify the effects of errors is shown. Figure 3 It shows Figure 1 A simplified top view of the apparatus used to verify the effects of errors; Figure 4 A simplified top view of a platform plate for verifying the effects of errors according to an embodiment of the present invention is shown, wherein the corrugated plate assembly has been removed; Figure 5 A perspective view of an apparatus for verifying the effects of errors according to an embodiment of the present invention is shown, the apparatus being equipped with a probe assembly; Figure 6 It shows Figure 1 The front sectional view of the device used to verify the effects of errors is shown. Figure 7 It shows Figure 1 A simplified top view of the apparatus used to verify the effects of errors; Figure 8 It shows Figure 7 A simplified top view of the base of the probe assembly of the device used to verify the effects of errors; Figure 9 The diagram illustrates the chordal pressure distribution on the upper surface of an apparatus for verifying the effects of errors according to an embodiment of the present invention; and Figure 10The diagram illustrates the spanwise pressure distribution on the upper surface of an apparatus for verifying the effects of errors, according to an embodiment of the present invention.

[0019] Figure Labels

[0020] 1. Base

[0021] 2 Support components

[0022] 3 Platform Board

[0023] 4 Corrugated Plate Assembly

[0024] 5. Probe Assembly

[0025] 31 Flat sections

[0026] 32 Edge

[0027] 33 Test Area

[0028] 34 Steps

[0029] 41 Corrugated plate base

[0030] 42 Corrugated plate components

[0031] 51 Base

[0032] 52 turntables

[0033] 53 probes

[0034] 54 gasket Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention in any way.

[0036] The directional terms "front," "rear," etc., used herein are defined according to the front view of the present invention. Specifically, "front" refers to the leftward direction in the front view, while "rear" refers to the rearward direction in the front view. However, it should be understood that "front" and "rear" in the following text can be used interchangeably without affecting the description of the embodiments.

[0037] Figure 1 A perspective view of an apparatus for verifying the effects of errors according to an embodiment of the present invention is shown, and Figure 2 It shows Figure 1 The diagram shows a front sectional view of the apparatus used to verify the effects of errors. Figure 3 It shows Figure 1 The diagram shows a top view of the apparatus used to verify the effects of errors.

[0038] like Figure 1-3As shown, the entire device consists of a base 1, support members 2, a platform plate 3, and simulation components. In this embodiment of the invention, the base 1 serves as the wind tunnel floor, an inherent feature of the test wind tunnel. Multiple support members 2 are fixedly connected to the base 1. For example, the support members 2 can be designed with suitable floor interfaces according to the actual wind tunnel floor structure to achieve a fixed connection. It should be understood that other fixed connection methods are also permitted. In this embodiment, specific reference is made to... Figure 1 The design incorporates six support members 2, or three pairs of support members. Two pairs (the front and rear support members) primarily support the platform plate 3, while the third pair is positioned between these two pairs for the routing of the pressure testing pipeline. It should be understood that although the present invention illustrates an embodiment with three pairs of support members 2, those skilled in the art can customize the number of support members as desired, for example, three, four, five, seven, eight, or more.

[0039] Preferably, the support member 2 can be arranged along the spanwise and chordwise directions, so that the lateral force of the support member 2 is controlled. This ensures that the deformation of the platform plate 3 is sufficiently small during the test, and also ensures that the aerodynamic interference on the upper surface of the platform plate 3 is minimized. (Refer to...) Figure 7 and 8 The spanwise and chordwise pressure distribution on the upper surface is shown.

[0040] As shown in the figure, the platform plate 3 is supported by the support member 2 and includes a flat portion 31 and an edge 32. Figure 3 and 4 (Not shown in the image), wherein the edges 32 of the platform plate 3, including the front and rear edges, are designed as airfoil edges. This high-speed airfoil edge design prevents the pressure suction peak at the edge from experiencing a sharp increase or decrease, with the transition position around 7%, and gives the upper and lower surfaces of the platform plate 3 good aerodynamic characteristics at high Mach numbers.

[0041] Continue to refer to the accompanying drawings, and additionally refer to... Figure 4 The platform plate 3 includes a test area 33. This test area is preferably located in the central portion of the platform plate 32, and the test area 33 includes a stepped portion 34 to support the simulation component. This design results in a relatively flat pressure distribution in the test area 33 in the central portion of the platform plate, with no pressure gradient in the downstream direction. Manufacturing errors can be studied in this area without other interfering factors, achieving precise control of variables.

[0042] In an embodiment of the present invention, the simulation component of the apparatus for verifying the influence of errors is detachably mounted in the test area 33 of the platform plate 3. The simulation component includes a corrugated plate assembly 4 and a probe assembly 5, wherein the corrugated plate assembly 4 is used for corrugated plate pressure measurement tests, and the probe assembly 5 is used for total hydrostatic probe tests. These two components are described in detail below with reference to the accompanying drawings.

[0043] Figure 1-3 An embodiment of a device for verifying the effects of errors, equipped with a corrugated plate assembly 4, is shown. The corrugated plate assembly 4 includes a corrugated plate base 41 and a corrugated plate component 42, wherein the corrugated plate base 41 is detachably mounted in the test area 33 of the platform plate 3, and the corrugated plate component 42 is detachably mounted on the corrugated plate base 41. Pressure measuring points are arranged on the surface of the corrugated plate component as needed. Figure 1 (As can be seen in the image) to obtain the pressure distribution on the surface of the corrugated plate component.

[0044] Preferably, the corrugated plate component 42 includes multiple corrugated plates, each with different specifications, so that different specifications of corrugated plates can be replaced during the test to simulate the effect of corrugation on surface pressure distribution.

[0045] When conducting a corrugated plate pressure test, the installation sequence of the device for verifying the influence of errors according to an embodiment of the present invention is as follows: 1) Install (for example, three pairs) of support members 2 onto the wind tunnel floor that serves as the base 1; 2) Install the platform plate 3 onto the support member 2; 3) Install the corrugated plate base 41 onto the platform plate 3; 4) Install the corrugated plate component 42 onto the corrugated plate base 41; and 5) Replace the corrugated plates of different specifications in step 4) with the corrugated plates according to the test requirements and conduct the test.

[0046] Figure 5-8 An embodiment of a device for verifying the effects of errors, equipped with a corrugated plate assembly 4, is shown. During a total hydrostatic probe installation error verification test, the corrugated plate assembly 4 in the test area 33 at the center of the platform plate 3 is replaced with a probe assembly 5. Specifically, the probe assembly 5 includes a base 51, a turntable 52, a corrugated plate component 42, and a probe 53 (a total hydrostatic probe in this embodiment). The base 51 is detachably mounted on the platform plate, the turntable 52 is rotatably mounted on the base 51, the corrugated plate component 42 is detachably mounted on the base 51, and the probe 53 is detachably mounted on the turntable 52. Preferably, the corrugated plate component 42 is positioned below the probe 53. The turntable 52 can rotate to simulate different angles of attack of the probe 53.

[0047] Preferably, the corrugated plate component 42 includes multiple corrugated plates, each with different specifications, to allow for the replacement of different specifications of corrugated plates during testing to change the corrugation. Also preferably, the probe assembly 5 includes multiple gaskets 54, each with different specifications, wherein, before mounting the probe 53, one of the multiple gaskets 54 can be selected and fitted onto the turntable 52 to simulate different steps of the total hydrostatic probe 53.

[0048] By changing the angle of the turntable 52, the angle of the probe 53 can be changed to simulate the effect of the angle of attack deviation of the hydrostatic probe 53; by replacing the shims 54 of different specifications on the turntable, the step difference between the probe 53 and the platform plate 3 can be adjusted to simulate the effect of the step difference of the probe 53; corrugated plates of different specifications are installed under the probe 53 to simulate the effect of the corrugation under the probe 53 on the hydrostatic measurement.

[0049] When conducting a total hydrostatic probe test, the installation sequence of the device for verifying the influence of errors according to an embodiment of the present invention is as follows: 1) Install (for example, three pairs) of support members 2 onto the wind tunnel floor that serves as the base 1; 2) Install the platform plate 3 onto the support member 2; 3) Install the base 51 onto the platform plate 3; 4) Install the turntable 52 on the base 51 and select a suitable shim 54 on the turntable 52; 5) Install the total hydrostatic probe 53 on the turntable 52; 6) Install the corrugated plate component 42 onto the base 51; 7) Replace the gaskets of different specifications in step 4) according to the test requirements to change the step difference of the total hydrostatic probe 53; 8) Adjust the angle of turntable 52 in step 5) according to the test requirements to change the angle of attack of the total hydrostatic probe 53; and 9) Change the specifications of the corrugated plate below probe 53 in step 6) according to the test requirements to change the corrugation of the area below the total hydrostatic probe 53.

[0050] The apparatus for verifying the effects of errors according to the present invention has the following advantages: 1) The platform plate adopts a high-speed airfoil head design, which prevents the pressure suction peak at the head from experiencing drastic increases or decreases. The transition position is around 7%, and the upper and lower surfaces of the platform plate have good aerodynamic characteristics; 2) The pressure distribution in the test area in the central part of the platform plate is relatively flat, with no pressure gradient in the downstream direction. There are no other interfering factors in studying manufacturing errors in this area, thus achieving precise control of variables. 3) The support components were arranged in both spanwise and chordwise directions to control the lateral force of the support components, ensuring that the deformation of the platform plate was small enough during the test and that the aerodynamic interference to the upper surface was minimized.

[0051] While the structure and installation method of the present invention have been described above with reference to preferred embodiments, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the invention. Therefore, modifications and variations can be made to the present invention, all of which will fall within the scope defined by the appended claims.

Claims

1. An apparatus for verifying the influence of manufacturing errors in a pressure measurement area on an aircraft surface, the apparatus comprising: Base; Multiple support members are fixedly connected to the base; Platform plate, supported by the support member, the platform plate including a flat portion and an edge, the flat portion including a test area; and A simulation component, detachably mounted in the test area of ​​the platform plate. The manufacturing errors of the pressure measurement area on the aircraft surface include waviness, probe angle of attack, and probe step difference. The platform plate has an edge designed as a high-speed airfoil, and the test area of ​​the flat portion is located at the center of the platform plate. The test area includes a stepped section to support the simulation component, such that there is no pressure gradient in the downstream direction of the test area in the central part of the platform plate.

2. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area on an aircraft surface as described in claim 1, characterized in that... The simulation assembly includes a corrugated plate assembly and a probe assembly. The corrugated plate assembly is configured to simulate the effect of waviness on surface pressure distribution, and the probe assembly is configured to simulate the effect of manufacturing deviations on static pressure measurement. Either the corrugated plate assembly or the probe assembly is detachably mounted in the test area of ​​the platform plate.

3. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area on an aircraft surface as described in claim 2, characterized in that... The corrugated plate assembly includes a corrugated plate base and a corrugated plate component. The corrugated plate base is detachably mounted in the test area of ​​the platform plate, and the corrugated plate component is detachably mounted on the corrugated plate base.

4. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area of ​​an aircraft surface as described in claim 2, characterized in that, The probe assembly includes a base, a turntable, a corrugated plate component, and a probe. The base is detachably mounted on the platform plate, the turntable is rotatably mounted on the base, the corrugated plate component is detachably mounted on the base, and the probe is detachably mounted on the turntable.

5. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area of ​​an aircraft surface as described in claim 4, characterized in that, The probe assembly also includes multiple gaskets, each with different specifications, wherein one of the multiple gaskets is selected to be mounted on the turntable before the probe is installed.

6. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area on an aircraft surface as described in claim 3 or 4, characterized in that, The corrugated plate component includes multiple corrugated plates, each with different specifications.

7. The apparatus for verifying the influence of manufacturing errors in the pressure measurement area of ​​an aircraft surface as described in claim 1, characterized in that, The support includes three pairs of support members, two of which are used to support the platform plate, while the other pair of support members is disposed between the two pairs of support members for the routing of the pressure measuring pipeline.

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