A mass center measuring instrument

Abstract

The application discloses a mass centroid measuring instrument, and relates to the technical field of engine testing equipment, which comprises an engine, a movable frame, a fixed frame, a first force measuring assembly, a second force measuring assembly, a third force measuring assembly and an in-situ calibration device, the movable frame is arranged in the fixed frame, the first force measuring assembly, the second force measuring assembly and the third force measuring assembly are arranged between the movable frame and the fixed frame, the engine is arranged on the movable frame at an angle of 45 degrees with a horizontal line, the first force measuring assembly is arranged horizontally, the second force measuring assembly is arranged vertically, the third force measuring assembly is perpendicular to the first force measuring assembly, and the in-situ calibration device is connected to the movable frame, the measured object is obliquely arranged in the application, mass centroid measurement is carried out in the static state of the measured object, the movement of the measured object is avoided, the safety of measurement is improved, and the structure is simple.

Description

Technical Field

[0001] This invention relates to the field of engine testing equipment technology, specifically to a mass centroid measuring instrument. Background Technology

[0002] An aero-engine is a highly complex and precise thermodynamic machine. As the heart of an aircraft, it not only powers the aircraft's flight but also serves as a crucial driving force for the development of the aviation industry. Every major revolution in human aviation history is inseparable from the technological advancements in aero-engines. During the research and development of aero-engines, it is necessary to measure the engine's center of mass to ensure its stability during flight. Therefore, a measuring instrument is required. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a mass centroid measuring instrument.

[0004] The system includes an engine, a moving frame, a fixed frame, a first force measuring component, a second force measuring component, a third force measuring component, and an in-situ calibration device. The moving frame is disposed within the fixed frame. The first, second, and third force measuring components are disposed between the moving frame and the fixed frame. The engine is disposed on the moving frame at a 45° angle to the horizontal line. The first force measuring component is horizontally disposed, the second force measuring component is vertically disposed, and the third force measuring component is perpendicular to the first force measuring component. The in-situ calibration device is connected to the moving frame.

[0005] Furthermore, the first force measuring component, the second force measuring component, and the third force measuring component have the same structure. The first force measuring component includes a universal flexible component and a force sensor. Two universal flexible components are provided, and the two universal flexible components are respectively located on both sides of the force sensor. One universal flexible component is connected to the moving frame, and the other universal flexible component is connected to the fixed frame.

[0006] Furthermore, three first force measuring components are provided, and the three first force measuring components are parallel to each other and located on the same circumference.

[0007] Furthermore, three second force measuring components are provided, and the three second force measuring components are parallel to each other and located on the same circumference.

[0008] Furthermore, three third force measuring components are provided, and the three third force measuring components are parallel to each other and located on the same circumference.

[0009] Furthermore, the force sensor has a range of 1.25KN to 1250KN.

[0010] Furthermore, the force sensor has a range of 1.25kN, 2.5kN, 5kN, 12.5kN, 25kN, 50kN, 125kN, 250kN, 500kN, or 1250kN.

[0011] The advantages of this invention compared to the prior art are:

[0012] In this scheme, the engine is set at a 45° angle to the horizontal line on the moving frame. A first force measuring component, a second force measuring component, and a third force measuring component are set between the moving frame and the fixed frame. The first force measuring component is set horizontally, the second force measuring component is set vertically, and the third force measuring component is perpendicular to the first force measuring component. This enables the measurement of the center of mass of the object being measured to be performed while the object is stationary, avoiding the movement of the object being measured and improving the safety of the measurement. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure in which the first force measuring component, the second force measuring component, and the third force measuring component are arranged on the moving frame;

[0014] Figure 2 This is a block diagram of the in-situ calibration device;

[0015] Figure 3 This is a schematic diagram of the speed-regulating motor.

[0016] Figure 4 This is a schematic diagram of the first force measuring component.

[0017] Reference numerals: First force measuring component 1, Second force measuring component 2, Third force measuring component 3, Fourth force measuring component, Universal flexible component 5, Force sensor 6, Motor 7, Reducer 8, Calibration support 9. Detailed Implementation

[0018] Combined with appendix Figure 1-4 As shown, a mass centroid measuring instrument includes an engine, a moving frame, a fixed frame, a first force measuring component 1, a second force measuring component 2, a third force measuring component 3, and an in-situ calibration device. The moving frame is disposed within the fixed frame. The first force measuring component 1, the second force measuring component 2, and the third force measuring component 3 are disposed between the moving frame and the fixed frame. There are three of each of the first force measuring component 1, the second force measuring component 2, and the third force measuring component 3. The three first force measuring components 1 are parallel to each other and located on the same circumference, the three second force measuring components 2 are parallel to each other and located on the same circumference, and the three third force measuring components 3 are parallel to each other and located on the same circumference.

[0019] The engine is mounted on the moving frame at a 45° angle to the horizontal line. The first force measuring component 1 is mounted horizontally, the second force measuring component 2 is mounted vertically, the third force measuring component 3 is perpendicular to the first force measuring component 1, and the in-situ calibration device is connected to the moving frame.

[0020] The force sensor 6 has a range of 1.25kN to 1250kN, and the range of the force sensor 6 is 1.25kN, 2.5kN, 5kN, 12.5kN, 25kN, 50kN, 125kN, 250kN, 500kN or 1250kN.

[0021] For measuring instruments with a range of ≤5t, a mechanical in-situ calibration device driven by a precision motor is used; for measuring ranges of ≤5t, a hydraulic in-situ calibration device is used.

[0022] In-situ calibration device, including

[0023] Engine test stand: The engine is mounted on the test stand, which is composed of a moving frame and a fixed frame;

[0024] Motor power supply: Provides electrical energy to the speed-regulating motor;

[0025] Motor drive: controls the drive power of the speed-regulating motor;

[0026] Speed-regulating motor: generates driving force;

[0027] Fourth force measuring component: Acquires standard force;

[0028] Industrial control computer: Receives test data from the fourth force measuring component and transmits the data information to the motor drive;

[0029] The motor power supply is connected to the motor drive, the motor drive is connected to the speed-regulating motor, the output end of the speed-regulating motor is equipped with a mechanical loading device, the mechanical loading device is connected to the fourth force measuring component, the fourth force measuring component is connected to the engine test frame, the industrial control computer is electrically connected to the fourth force measuring component and the motor drive respectively, a digital display is set between the fourth force measuring component and the industrial control computer, and a display is connected to the industrial control computer.

[0030] The speed-regulating motor consists of a motor 7, a reducer 8, and a calibration support 9. The output end of the motor 7 is connected to the reducer. Both the reducer and the motor 7 are mounted on the calibration support 9. The mechanical loading device is rotatably mounted on the calibration support 9. The reducer is connected to the mechanical loading device in a transmission manner.

[0031] The first force measuring component 1, the second force measuring component 2, the third force measuring component 3 and the fourth force measuring component have the same mechanism. The first force measuring component 1 consists of a force sensor 6 and a universal flexible component 5. Two universal flexible components 5 are provided, and the two universal flexible components 5 are respectively provided on both sides of the force sensor 6. One universal flexible component 5 is connected to the moving frame and the other universal flexible component 5 is connected to the fixed frame.

[0032] Before measurement, the in-situ calibration device uses a known standard force to calibrate the force sensor on the fourth force measuring component. The effect of the standard force on the fourth force measuring component 4 is equivalent to the effect of the mass on the first force measuring component 1, the second force measuring component 2, and the third force measuring component 3. Static calibration and verification of the first force measuring component 1, the second force measuring component 2, and the third force measuring component 3 are performed to simulate actual working conditions, and the input-output characteristic equation of the working sensor is obtained.

[0033] The main technical parameters of the in-situ calibration device are as follows:

[0034] ● Each level loads in approximately 30 seconds;

[0035] ● The power source accuracy is better than 0.05%FS;

[0036] ●Power source fluctuation is better than 0.05%FS;

[0037] ●Working modes: manual and automatic.

[0038] The advantages of in-situ calibration devices are: 1. The standard force value can be continuously varied, and calibration of any point can be completed within the thrust range; 2. The calibration process is automated, with high work efficiency, reducing the labor intensity of operators and keeping them away from unsafe areas of the test site; 3. In-situ calibration can be performed immediately after the engine hot test.

[0039] The measuring instrument mainly consists of a measuring frame including a moving frame, a fixed frame, a force measuring component, an in-situ calibration system, and a measuring system. The moving frame is 90° V-shaped, with its load-bearing end face perpendicular to both sides, and the angle between the moving frame axis and the direction of gravity is 45°. The force measuring component is installed between the moving and fixed frames. The z-axis of the moving frame coordinate system o-xyz is parallel to the moving frame axis, the oxy plane is the connection surface between the main thrust working sensor and the moving frame, and the origin is the center of the circle containing the three main thrust working sensors. The coordinates of the center of gravity of the measured object are G(xw,yw,zw).

[0040] According to the force equilibrium condition of a rigid body The mass W and the centroid parameter x can be obtained. w y w z w Calculation formula:

[0041]

[0042] In the formula L y1z L yz L x1z L xz To measure the structural dimensions of the frame.

[0043] The force sensor uses the U10M force sensor from HBM (Germany) for measuring tensile and compressive forces. It is widely used in various static and dynamic measurement applications and boasts extremely high accuracy. The main technical parameters are as follows:

[0044] ● Measuring range: ±1.25kN~±1.25MN;

[0045] ●Accuracy class: 0.02;

[0046] ● Output signal: Sensitivity 1mV / V;

[0047] ●Operating temperature range: -40℃~+85℃;

[0048] ● Full-scale deformation of the working sensor: 0.02mm;

[0049] ●Overload: 150%;

[0050] ●Connecting thread: M16×2;

[0051] ●Weight: 0.5kg.

[0052] Centroid measurement error

[0053] By x w y w z w The calculation formula can be derived from total differential:

[0054]

[0055] In structural design, gravity is directed towards the center of the mounting circle where the three working sensors are located.

[0056]

[0057] Substituting the above values, we get:

[0058]

[0059] The universal joint consists of two sets of main spring plates and four support spring plates. The two sets of main spring plates are arranged perpendicularly to each other, each providing deflection in one direction. Their combined motion is omnidirectional motion. The advantages of the universal joint are: 1. High efficiency, achieving both high load-bearing capacity and low rotational stiffness; 2. Approaching the ideal "ball joint" with zero friction, no interruption, and constant rotation center; 3. Compact structure, small size, good dynamic performance, good stability, and safety and reliability.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A mass center of mass measuring instrument, comprising an engine, characterized in that, It also includes a moving frame, a fixed frame, a first force measuring component (1), a second force measuring component (2), a third force measuring component (3), and an in-situ calibration device. The moving frame is set inside the fixed frame. The first force measuring component (1), the second force measuring component (2), and the third force measuring component (3) are set between the moving frame and the fixed frame. The engine is set on the moving frame at a 45° angle to the horizontal line. The first force measuring component (1) is set horizontally, the second force measuring component (2) is set vertically, and the third force measuring component (3) is perpendicular to the first force measuring component (1). The in-situ calibration device is connected to the moving frame. The first force measuring component (1) is provided in three parts, and the three first force measuring components (1) are parallel to each other and located on the same circumference; The second force measuring component (2) is provided in three parts, and the three second force measuring components (2) are parallel to each other and located on the same circumference; The third force measuring component (3) is provided in three parts, and the three third force measuring components (3) are parallel to each other and located on the same circumference.

2. The mass centroid measuring instrument according to claim 1, characterized in that, The first force measuring component (1), the second force measuring component (2) and the third force measuring component (3) have the same structure. The first force measuring component (1) includes a universal flexible component (5) and a force sensor (6). Two universal flexible components (5) are provided. The two universal flexible components (5) are respectively provided on both sides of the force sensor (6). One universal flexible component (5) is connected to the moving frame and the other universal flexible component (5) is connected to the fixed frame.

3. A mass centroid measuring instrument according to claim 2, characterized in that, The force sensor (6) has a range of 1.25KN to 1250KN.

4. A mass centroid measuring instrument according to claim 3, characterized in that, The force sensor (6) has a range of 1.25kN, 2.5kN, 5kN, 12.5kN, 25kN, 50kN, 125kN, 250kN, 500kN or 1250kN.

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