Center loading calibration device for force measuring system of suspension type engine test bed

Abstract

The invention belongs to the technical field of aero-engines, and particularly relates to a suspension type engine test bed force measuring system center loading calibration device which comprises a center loading support (7), a connecting pull rod (5), a simulation engine (3), a hydraulic loading device (6), a movable frame (2), a static frame (1) and a supporting platform (4). During use, according to positive and negative thrust calibration requirements, the calibration device is installed in front of and behind a test run rack, standard load is applied in a pulling mode, and the pull rod is located at the center height of a simulation engine.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a center loading calibration device for a suspended engine test bench force measurement system. Background Technology

[0002] During engine testing, thrust is measured using a force sensor on the engine test bench, and a device is needed to calibrate the sensor.

[0003] When designing an engine test bench thrust measurement rig, a rig thrust calibration system is typically included for online calibration of the test bench thrust system. Since the rig thrust calibration system and the thrust measurement sensor are located on the same plane, calibration using this system is also called parallel loading calibration. During parallel loading calibration on a suspended test bench, although the calibration device is installed above the engine's central axis (hanger), which can eliminate systematic errors caused by the elastic force of flexible components, the drag force of pipelines and test lines connected to the engine, and the output characteristics of the working sensor, the transmission path of thrust generated by the engine is not consistent with the actual test. The bending moment effect caused by this height difference cannot be eliminated, affecting the measurement accuracy of the thrust parameters.

[0004] Currently, some engine test benches can achieve center loading calibration of the bench force measurement system by partial modifications, utilizing existing site conditions. However, during use, it was found that this modified center loading device has certain shortcomings due to limitations imposed by the site conditions. For example, the system's structural dimensions are restricted by the site, preventing optimal design and resulting in a lower overall structural strength coefficient. Furthermore, the lack of a pre-reserved installation foundation leads to significant deformation of the calibration device support under load, causing the standard load to deviate from the engine's central axis and affecting calibration accuracy. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a center loading calibration device for a suspended engine test bench force measurement system, comprising: a center loading bracket, a connecting rod, a simulated engine, and a hydraulic loader; the simulated engine is connected to the moving and stationary frames of the test bench;

[0006] The stationary frame is fixedly mounted on the top platform; the moving frame is slidably and positionably mounted on the stationary frame; the simulated engine is fixedly mounted on the moving frame; a load sensor to be calibrated is provided between the moving frame and the simulated engine or between the moving frame and the stationary frame; the axis of the simulated engine is parallel to the sliding direction of the moving frame.

[0007] The central loading bracket is fixed to the ground and a hydraulic loading device is installed on it. The output shaft of the hydraulic loading device is connected to the standard load sensor on the simulated engine through a connecting rod. The hydraulic loading device and the standard load sensor apply a standard load to the simulated engine to calibrate the load sensor to be checked.

[0008] Preferably, the stationary frame is fixedly installed on the top platform; the moving frame is connected to the stationary frame via a sliding connection mechanism and fixed to different positions on the stationary frame via a locking mechanism. Preferably, the simulated engine has a straight section for displacing the center of gravity adjustment trolley, and the center of gravity adjustment trolley has a FAMA (Faraday Future) mechanism.

[0009] Preferably, the connecting rod is connected to the standard load sensor of the simulated engine via a flexible rod, which is formed by axially connecting multiple flat segments, with adjacent flat segments perpendicular to each other.

[0010] Preferably, the hydraulic loading device is fixedly mounted on the central loading bracket by an adjustable positioning plate, and the position of the hydraulic loading device is adjusted by a set screw on the adjustable positioning plate.

[0011] Preferably, the central loading bracket is bolted to the reserved foundation on the ground and includes a main column and diagonal braces. The top of the diagonal braces is connected to the main column, and the bottom is connected to the reserved foundation on the ground.

[0012] Preferably, the connecting rod is supported by a support platform fixed to the ground.

[0013] Preferably, the support platform has hydraulic lifting capability.

[0014] Preferably, the hydraulic loading device applies a pulling force to the simulated engine.

[0015] The center loading calibration device of the suspended test bench thrust measurement system ensures that the transmission path of the standard load and the actual thrust generated by the engine are consistent during the calibration of the thrust measurement system. This solves the problem of the bending moment caused by the height difference between the line of action and the line of action of the thrust generated by the engine when calibrating the parallel loading device on the test bench, which affects the accuracy of thrust parameter calibration, and improves the calibration and measurement accuracy of the test bench thrust measurement system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a center loading calibration device for a suspended engine test bench force measurement system.

[0017] Figure 2 This is a schematic diagram of the hydraulic loading device installation;

[0018] Figure 3 This is a schematic diagram of a flexible rod;

[0019] Figure 4This is a schematic diagram of a simulated engine. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings. Figure 1

[0021] This application provides a center loading calibration device for a suspended engine test bench force measurement system, such as... Figures 1-4 As shown, it includes: a central loading bracket 7, a connecting rod 5, a simulated engine 3, a moving frame 2, and a stationary frame 1;

[0022] The stationary frame 1 is fixedly installed on the top platform; the movable frame 2 is installed on the stationary frame 1 in a slidable and positionable manner, and a sensor to be calibrated is installed between the movable frame 2 and the stationary frame 1. An elastic element, such as a spring sheet, can be installed between the movable frame 2 and the stationary frame 1; when the movable frame 2 and the stationary frame 1 are locked, a sensor to be calibrated is installed at the contact position between the two to measure the load between them.

[0023] The simulated engine 3 is fixedly mounted on the moving frame 2, and a load sensor to be checked is set between the moving frame 2 and the stationary frame 1; the axis of the simulated engine 3 is parallel to the sliding direction of the moving frame 2;

[0024] The central loading bracket 7 is fixed to the ground, and a hydraulic loading device 6 is installed on it. The output shaft of the hydraulic loading device 6 is connected to the standard load sensor on the simulated engine 3 via a connecting rod 5. The hydraulic loading device 6 and the standard load sensor apply a standard load to the simulated engine 3 to calibrate the load sensor to be calibrated. During use, according to the requirements of forward and reverse thrust calibration, the calibration device is installed at the front and rear of the test bench, and the standard load is applied by pulling. The connecting rod 5 is located at the center height of the simulated engine 3.

[0025] The center loading bracket 7 is the load-bearing structure of the center loading calibration device, such as... Figure 2As shown, the system is bolted to a pre-reserved foundation on the ground, including the main column and diagonal braces. The main column must have sufficient strength; during design, based on finite element calculations of the operating load, a safety factor greater than 2 is required. A mounting base for the hydraulic loading device 6's loading cylinder is reserved at the top of the main column. The position of the loading cylinder is finely adjusted using the set screw 62 on the adjustable positioning plate 61 on the mounting base. Figure 3 As shown; the height of the main column must ensure that the axis of the loading cylinder is coaxial with the axis of the simulated engine 3 installed on the test bench. When the center loading calibration device is applied to test benches with different center heights, auxiliary diagonal braces are set at each calibration height position to increase the strength of the center loading bracket 7 and reduce the load deformation.

[0026] Simulated Engine 3 Figure 4 As shown, its shape and structure are similar to those of an actual engine, and it can simulate the weight, mounting sections, and center of gravity of multiple engine models. The weight and center of gravity of the simulated engine 3 can be adjusted by counterweights, which is accomplished by changing the number of FAMAs on the trolley in the straight section of the simulated engine 3 and moving their positions on the track. The simulated engine 3 is designed with a fuel supply pipe interface and an air starter intake pipe interface. The simulated engine 3 can be mounted on the moving frame 2 with the engine mount to achieve a mating connection.

[0027] In some alternative embodiments, the stationary frame 1 is fixedly installed on the top platform; the movable frame 2 is connected to the stationary frame 1 via a sliding connection mechanism and is fixed to different positions on the stationary frame 1 via a locking mechanism.

[0028] In some alternative embodiments, the simulated engine 3 has a straight section that displaces the center of gravity adjustment trolley, which has a FAMA.

[0029] In some alternative embodiments, the connecting rod 5 is connected to the standard load sensor of the simulated engine 3 by a flexible rod 51, which is formed by axially connecting multiple flat segments, with adjacent flat segments perpendicular to each other.

[0030] In some alternative embodiments, the hydraulic loading device 6 is fixedly mounted on the central loading bracket 7 by an adjustable positioning plate 61, and the position of the hydraulic loading device 6 is adjusted by a set screw 62 on the adjustable positioning plate 61.

[0031] In some alternative implementations, the central loading bracket 7 is bolted to a pre-reserved foundation on the ground and includes a main column and diagonal braces. The top end of the diagonal braces is connected to the main column, and the bottom end is connected to the pre-reserved foundation on the ground.

[0032] In some alternative implementations, the connecting rod 5 is further supported by a support platform 4 fixed to the ground.

[0033] In some alternative implementations, the support platform 4 has hydraulic lifting capability.

[0034] In some alternative embodiments, the hydraulic loading device 6 applies a pulling force to the simulated engine 3.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A center loading calibration device for a suspended engine test bench force measurement system, characterized in that, include: The center loading bracket (7), connecting rod (5) and simulated engine (3); the test bench has a moving frame (2) and a stationary frame (1); The stationary frame (1) is fixedly installed on the top platform; the moving frame (2) is installed on the stationary frame (1) in a slidable and positionable manner; the simulated engine (3) is fixedly installed on the moving frame (2); a load sensor to be checked is provided between the moving frame (2) and the stationary frame (1); the axis of the simulated engine (3) is parallel to the sliding direction of the moving frame (2); The central loading bracket (7) is fixed on the ground and a hydraulic loading device (6) is installed on it. The output shaft of the hydraulic loading device (6) is connected to the standard load sensor on the simulated engine (3) through the connecting rod (5). The hydraulic loading device (6) and the standard load sensor apply a standard load to the simulated engine (3) to calibrate the load sensor to be checked.

2. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The stationary frame (1) is fixedly installed on the top platform; the moving frame (2) is connected to the stationary frame (1) through a sliding connection mechanism and is fixed to different positions on the stationary frame (1) via a locking mechanism.

3. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The simulated engine (3) has a straight section that allows the center of gravity adjustment trolley to shift, and the center of gravity adjustment trolley has a FAMA.

4. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The connecting rod (5) is connected to the standard load sensor of the simulated engine (3) by a flexible rod (51), which is formed by axially connecting multiple flat segments, with adjacent flat segments perpendicular to each other.

5. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The hydraulic loading device (6) is fixedly installed on the central loading bracket (7) by an adjustable positioning plate (61), and the position of the hydraulic loading device (6) is adjusted by the set screw (62) on the adjustable positioning plate (61).

6. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The center loading bracket (7) is bolted and installed on the reserved foundation on the ground. It includes the main column and the diagonal tie rod. The top of the diagonal tie rod is connected to the main column, and the bottom is connected to the reserved foundation on the ground.

7. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The connecting rod (5) is supported by the support platform (4) on the fixed ground.

8. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The support platform (4) has hydraulic lifting capability.

9. The center loading calibration device for the force measurement system of the suspended engine test bench as described in claim 1, characterized in that, The hydraulic loading device (6) applies a pulling force to the simulated engine (3).

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