CN112362231B - In-situ loading calibration system and method for three-component force measuring device - Google Patents
In-situ loading calibration system and method for three-component force measuring device Download PDFInfo
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- CN112362231B CN112362231B CN202011271697.8A CN202011271697A CN112362231B CN 112362231 B CN112362231 B CN 112362231B CN 202011271697 A CN202011271697 A CN 202011271697A CN 112362231 B CN112362231 B CN 112362231B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Abstract
The invention provides an in-situ loading calibration system and method for a three-component force measuring device, which solve the problem that the value of a measuring force sensor in the existing three-component force measuring device cannot truly represent the stress of an engine. The checking system comprises a loading mechanism, a hydraulic station and a control unit; the loading mechanism comprises 1 thrust loading assembly and 2 lifting force loading assemblies; the thrust loading assembly comprises a thrust force measuring element which is arranged at two ends of a thrust hydraulic cylinder T-bar on the thrust fixed frame and is respectively connected with a piston rod of the thrust hydraulic cylinder and the tail part of the engine; the 2 lift force loading assemblies are arranged side by side along the axis direction of the engine, and each lift force loading assembly comprises a lift force hydraulic cylinder arranged on the thrust fixed frame and a lift force measuring element of which the two ends are respectively connected with a piston rod of the lift force hydraulic cylinder and the thrust movable frame; the hydraulic station is used for providing power for the thrust hydraulic cylinder and the lift hydraulic cylinder; the control unit is used for controlling the force value of the thrust force measuring element and the force value of the lift force measuring element to be equal to the required loading standard force value.
Description
Technical Field
The invention belongs to the field of wind tunnel free jet tests, relates to a three-component force measuring device, and particularly relates to an in-situ loading calibration system and method for the three-component force measuring device.
Background
On a wind tunnel free jet test bed, a three-component force measuring device is adopted to measure the lifting force, the pitching force and the thrust force of an engine; the structure of the three-component force measuring device is shown in fig. 1, and the three-component force measuring device comprises a thrust fixed frame 01, a thrust movable frame 02 arranged above the thrust fixed frame 01 in parallel, and three measuring force sensors 03 arranged between the thrust fixed frame 01 and the thrust movable frame 02, wherein an engine 04 is placed on the thrust movable frame.
The existing three-component force measuring device uses a value obtained by a measuring force sensor 03 to represent the stress of an engine, but because the force transmission loss and the central deviation exist between the engine 04 and the measuring force sensor 03, the value of the measuring force sensor 03 cannot truly represent the stress of the engine.
Disclosure of Invention
The invention provides an in-situ loading calibration system and method for a three-component force measuring device, aiming at solving the technical problem that the value of a measuring force sensor cannot truly represent the stress of an engine due to the fact that the force transmission loss exists between the engine and the measuring force sensor in the existing three-component force measuring device.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the in-situ loading calibration system for the three-component force measuring device comprises a thrust fixed frame, a thrust movable frame and three measuring force sensors, wherein an engine is placed on the thrust movable frame, and the in-situ loading calibration system is characterized in that:
the in-situ loading verification system comprises a loading mechanism, a hydraulic station and a control unit;
the loading mechanism comprises 1 thrust loading assembly arranged horizontally and 2 lift loading assemblies arranged vertically;
the thrust loading assembly comprises a thrust hydraulic cylinder and a thrust force measuring element, the thrust hydraulic cylinder is arranged on the thrust fixed frame through a thrust checking support, one end of the thrust force measuring element is connected with a piston rod of the thrust hydraulic cylinder, and the other end of the thrust force measuring element is used for being connected with the tail of the engine;
the 2 lift force loading assemblies are arranged side by side along the axis direction of the engine, each lift force loading assembly comprises a lift force hydraulic cylinder and a lift force measuring element, the lift force hydraulic cylinders are arranged on the thrust fixed frame, one end of each lift force measuring element is connected with a piston rod of each lift force hydraulic cylinder, and the other end of each lift force measuring element is connected with the thrust movable frame;
the hydraulic station is used for providing power for the thrust hydraulic cylinder and the lift hydraulic cylinder;
the control unit is used for adjusting the power provided by the hydraulic station to the thrust hydraulic cylinder in real time according to the force value of the thrust force measuring element, so that the force value of the thrust force measuring element is equal to the standard force value to be loaded; and the hydraulic station is used for adjusting the power provided by the hydraulic station to the lift hydraulic cylinder in real time according to the force value of the lift force measuring element, so that the force value of the lift force measuring element is equal to the standard force value required to be loaded.
Further, the thrust dynamometry element includes thrust standard force sensor and 2 thrust flexible pieces, and 2 thrust flexible piece's one end is connected with the both ends of thrust standard force sensor respectively, and one of them thrust flexible piece's the other end is connected with the piston rod of thrust hydraulic cylinder, and the other end of another thrust flexible piece is used for being connected with the engine afterbody.
Furthermore, the lift force measuring element comprises a lift force standard force sensor and 2 lift force flexible pieces, one end of each of the 2 lift force flexible pieces is connected with two ends of the lift force standard force sensor, the other end of one of the lift force flexible pieces is connected with a piston rod of the lift force hydraulic cylinder, and the other end of the other lift force flexible piece is connected with the thrust movable frame.
Furthermore, the thrust standard force sensor and the lift standard force sensor have the same structure and are both s-shaped tension and compression bidirectional force sensors.
Furthermore, the thrust flexible piece and the lifting flexible piece are the same in structure and are universal flexible pieces.
Furthermore, a first servo valve is arranged between the hydraulic station and the thrust hydraulic cylinder, and second servo valves are arranged between the hydraulic station and the 2 lift hydraulic cylinders;
the control unit comprises a controller, wherein the controller is used for receiving the signal of the thrust standard force sensor and controlling the opening of the first servo valve according to the signal, and is used for receiving the signal of the lift standard force sensor and controlling the opening of the second servo valve according to the signal.
Meanwhile, the invention also provides an in-situ loading calibration method for the three-component force measuring device, which is characterized in that the in-situ loading calibration system for the three-component force measuring device is adopted, and the calibration method comprises the following steps:
1) the engine is arranged on a thrust movable frame, a thrust loading assembly is connected with the tail of the engine, the thrust loading assembly loads along the axial direction of the engine, and a lift loading assembly loads along the normal direction of the engine;
2) establishing a thrust verification model
The following thrust check formula is established according to the first-order fitting relationship between the three measured force values F1, F2 and F3 of the measuring force sensor 03 and the three standard force loading forces Fx2, Fy1 and Fy 3:
3) solving for the constant term F 0 Sum coefficient matrix A
a) The hydraulic station applies power to the thrust hydraulic cylinder, and the control unit adjusts the power supplied by the hydraulic station to the thrust hydraulic cylinder in real time according to the force value of the thrust force measuring element until the force value F of the thrust force measuring element x2 The force value is equal to the standard force value to be loaded, and three measuring force sensors of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Loading multiple Fs x2 To obtain multiple sets of measuring forces F 1 、F 2 、F 3 A plurality of F x2 And multiple sets of measured forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 02 And of matrix A
b) The hydraulic station applies power to one of the lift force hydraulic cylinders, and the control unit adjusts the power provided by the hydraulic station to the thrust hydraulic cylinder in real time according to the force value of the lift force measuring element matched with the lift force hydraulic cylinder until the force value F of the thrust force measuring element y1 Equal to the standard force value to be loaded, three measuring force sensors of the three-component force measuring device respectively obtain a force F 1 、F 2 、F 3 (ii) a Loading multiple Fs y1 To obtain multiple sets of measuring forces F 1 、F 2 、F 3 A plurality of F y1 And sets of measurement forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 01 And of matrix A
c) The hydraulic station applies power to the other lift force hydraulic cylinder, and the control unit adjusts the power provided by the hydraulic station to the thrust hydraulic cylinder in real time according to the force value of the lift force measuring element matched with the lift force hydraulic cylinder until the force value F of the thrust force measuring element y3 The force value is equal to the standard force value to be loaded, and three measuring force sensors of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Loading multiple Fs y3 To obtain multiple sets of measuring forces F 1 、F 2 、F 3 A plurality of F y3 And sets of measurement forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 03 And of matrix A
4) Expression for obtaining output value of standard force sensor
According to
Obtaining a matrix A and according to a constant term F 02 、F 01 、F 03 And obtaining an expression of the output value of the standard force sensor by the matrix A:
wherein i is 1,2, 3; j is 1,2, 3;
5) expression for checking output value of standard force sensor
The hydraulic station simultaneously applies force F to the thrust hydraulic cylinder x2 ' and 2 lifting hydraulic cylinders exert force F y1 ˊ、F y3 ' will three-component force measuring deviceThree measuring force sensor measuring values F 1 ″、F 2 ″、F 3 Substituting the expression of the step 4) to calculate the calculation standard force F x2 ″、F y1 ″、F y3 ", the standard force F will be calculated x2 ″、F y1 ″、F y3 "with application of force F x2 ˊ、F y1 ˊ、F y3 Comparing the force values;
if the two numerical values are correspondingly equal, the expression in the step 5) is accurate, the actual stress of the engine can be measured according to the formula, and if the numerical values are not equal, the step 3) is returned to reload force.
Compared with the prior art, the invention has the advantages that:
1. the calibration system loads force in a hydraulic loading mode, achieves the effect that the loaded force value is equal to the standard force value needing to be loaded through the control unit, provides stable standard force for calibration, improves the accuracy of obtaining a calibration coefficient, and is high in long-term use reliability.
2. When the calibration system is used for calibration, 3 hydraulic cylinders (1 thrust hydraulic cylinder and 2 lifting hydraulic cylinders) can simultaneously output different force values, and the combined action state of thrust, lifting force and pitching moment generated when an engine works is simulated. The influence of a certain force component on the whole measuring system can be simulated by the output of single hydraulic cylinders or the output of any combination of the hydraulic cylinders.
3. The flexible part of the invention adopts a universal flexible part which has great rigidity along the axis, can well transfer the stress in the axis direction, and has great flexibility along other two orthogonal directions. Therefore, stress in the axial direction can be effectively transmitted, interference of force in other directions is avoided, and calibration loading accuracy is improved.
4. The verification method of the embodiment is in-situ calibration in an engine installation state. By F x2 、F y1 、F y2 The three position forces are loaded respectively and simultaneously, and the axial thrust, the lift force and the pitching moment generated by the real working state of the engine are simulated; at the same time, the connecting line is subjected to a loss of force during calibration, the cable and the transmission from the engine to the load cellThe force loss is taken into consideration, and the obtained check coefficient is closer to the real stress state of the engine.
Drawings
FIG. 1 is a schematic diagram of a conventional three-component force measuring device;
FIG. 2 is a schematic structural view of an in-situ loading verification system for a three-component force measuring device according to the present invention;
FIG. 3 is a schematic structural view of a thrust load cell in the in-situ loading calibration system for a three-component force measuring device according to the present invention;
FIG. 4 is a schematic structural view of the flexure of FIG. 3;
wherein the reference numbers are as follows:
01-a thrust fixed frame, 02-a thrust movable frame, 03-a measuring force sensor, 04-an engine, 1-a lift force loading assembly, 11-a lift force hydraulic cylinder, 12-a lift force measuring element, 121-a lift force standard force sensor, 122-a lift force flexible piece, 2-a thrust loading assembly, 21-a thrust hydraulic cylinder, 22-a thrust force measuring element, 221-a thrust standard force sensor, 222-a thrust flexible piece, 3-a thrust checking tool, 4-a thrust checking support, 5-a hydraulic station, 51-a first servo valve, 52-a second servo valve and 6-a control unit.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
In order to verify the correctness and the measurement precision of the three-component force measuring device, based on the decomposition and conversion of a force system, the invention designs a set of special in-situ calibration device for calibrating the three-component force measuring device in a use state, obtains the calibration coefficient of the three-component force measuring device by carrying out field loading and calibration on the three-component force measuring device, and realizes the accurate measurement of the stress of the engine 04.
As shown in fig. 2, an in-situ loading calibration system for a three-component force measuring device includes a loading mechanism, a thrust calibration tool 3, a thrust calibration bracket 4, a hydraulic servo system and a control unit 6; the whole calibration system is subjected to in-situ calibration in the state that the engine 04 is installed on the three-component force measuring device.
The loading mechanism loads in the axial direction and the normal direction of the engine 04 respectively, and has 3 loading points, wherein the axial direction is 1, and the normal direction is 2. The loading mechanism comprises 1 thrust loading assembly 2 arranged horizontally (axially) and 2 lift loading assemblies 1 arranged vertically (normally).
The thrust loading assembly 2 is arranged on the thrust fixed frame 01 through a thrust checking support 4, the loading direction is coaxial with the thrust line of the engine 04, the thrust loading assembly 2 comprises a thrust hydraulic cylinder 21 and a thrust force measuring element 22, the thrust checking support 4 is vertically arranged on the thrust fixed frame 01, the thrust hydraulic cylinder 21 is arranged at the upper end of the thrust checking support 4, the thrust force measuring element 22 comprises a thrust standard force sensor 221 and 2 thrust flexible pieces 222 arranged at two ends of the thrust standard force sensor 221, one ends of the 2 thrust flexible pieces 222 are respectively connected with two ends of the thrust standard force sensor 221, the other end of one thrust flexible piece 222 is connected with a piston rod of the thrust hydraulic cylinder 21, and the other end of the other thrust flexible piece 222 is connected with the tail of the engine 04 through a thrust checking tool 3;
the 2 lift force loading assemblies 1 are arranged in parallel front and back along the axis direction of the engine 04 and are arranged between the thrust fixed frame 01 and the thrust movable frame 02, each lift force loading assembly 1 comprises a lift force hydraulic cylinder 11 and a lift force measuring element 12, the lift force hydraulic cylinder 11 is arranged on the thrust fixed frame 01, the lift force measuring element 12 comprises a lift force standard force sensor 121 and 2 lift force flexible pieces 122, one end of each of the 2 lift force flexible pieces 122 is respectively connected with the upper end and the lower end of the lift force standard force sensor 121, the other end of one of the lift force flexible pieces 122 is connected with a piston rod of the lift force hydraulic cylinder 11, and the other end of the other lift force flexible piece 122 is connected with the thrust movable frame 02;
the thrust loading assembly 2 and the lift loading assembly 1 are identical in structure, as shown in fig. 3. In this embodiment, the thrust standard force sensor 221 and the lift standard force sensor 121 are both s-shaped tension-compression bidirectional force sensors, and both ends of the sensor are provided with a winding component to form a pair of universal hinges; the thrust flexible piece 222 and the lift flexible piece 122 have the same structure and are both universal flexible pieces, the structure of which is shown in fig. 4, the universal flexible piece is an integrated structure hinge with an arc notch and consists of an x and y pair of arc notch revolute pairs in orthogonal directions, a central shaft and thread structures at two ends of the shaft, the thread structures are used for being connected with threaded holes at the end parts of the s-shaped tension and compression bidirectional force measuring sensors, and the universal flexible piece can be used for carrying out limited angular displacement around the shaft. The universal flexible part has large axial rigidity and small rigidity in other directions, transfers axial force and reduces the loss of force in other directions and the interference on a standard force sensor.
The hydraulic servo system is used for providing power for the thrust hydraulic cylinder 21 and the lift hydraulic cylinder 11, and comprises a hydraulic station 5, an electro-hydraulic servo valve and a pipeline, and the hydraulic servo system is mainly used as a generating mechanism of a hydraulic pressure source and finally converts the hydraulic pressure source into a required standard force source. The electro-hydraulic servo valves comprise 1 first servo valve 51 and 2 second servo valves 52, the first servo valve 51 is arranged on a pipeline between the hydraulic station 5 and the thrust hydraulic cylinder 21, and the 2 second servo valves 52 are respectively arranged on a pipeline between the hydraulic station 5 and the 2 lifting hydraulic cylinders 11; the hydraulic station 5 provides power for the hydraulic cylinder, the action of the hydraulic cylinder is controlled by the control unit 6, and the loading force value of the hydraulic cylinder is subjected to feedback control through the standard force sensor.
The control unit 6 mainly comprises an RMC150 CPU high-performance closed-loop motion controller, a signal conditioning module and a plurality of peripheral circuits. The core of the controller is an RMC150 controller, which can realize accurate closed-loop PID control on position, speed, pressure intensity, pressure and the like, can be used for hydraulic multi-shaft synchronous control, and a single controller can synchronously control 2-8 shafts and support communication modes such as Ethernet, serial RS232/485, Profibus, direct I/O and the like. The PID control parameters can be set and adjusted through the RMCTools software carried by the controller, and the working state of the system can be monitored in real time. The control unit 6 can complete the functions of signal acquisition of the force sensor, loading and injection of PID controller parameters, closed-loop control of standard force, system alarm and the like.
When the axial standard force is loaded, the standard force to be loaded is set through a control computer (controller), the thrust standard force sensor 221 detects the loaded standard force in real time, the loaded standard force is fed back to the computer for comparison and forms a deviation signal, a control signal is formed through a control algorithm in the controller, a final control signal is generated through an amplifier to control the first servo valve 51, the first servo valve 51 controls a certain flow rate, the sum of the control signal and the deviation signal is finally generated through the amplifier, and the first servo valve 51 controls the standard force to be loadedThe pressure hydraulic oil enters the thrust hydraulic cylinder 21, the loading force of the hydraulic cylinder is transmitted to a tested loading object (the engine 04), meanwhile, the signal of the thrust standard force sensor 221 is received in real time, the opening degree of the first servo valve 51 is adjusted, and the force value F of the thrust force measuring element 22 is enabled to be x2 The standard force value is equal to the standard force value required to be loaded, the loading of the loaded object is completed, and a closed-loop control system is formed by the first servo valve 51, the thrust standard force sensor 221, the thrust hydraulic cylinder 21 and the control unit 6, so that the thrust loading assembly 2 provides stable standard force for verification. The loading of the lift force loading assembly 1 is the same as the loading mode of the thrust force loading assembly 2, a closed-loop control system is formed by the second servo valve 52, the lift force standard force sensor 121, the lift force hydraulic cylinder 11 and the control unit 6, the opening degree of the second servo valve 52 is adjusted, and the force values F of the 2 lift force measuring elements 12 are enabled to be adjusted y1 、F y3 The standard force value is equal to the standard force value required to be loaded, and stable standard force is provided for verification.
In the embodiment, standard force loading is realized in a hydraulic loading mode, during verification, 3 hydraulic cylinders (1 thrust hydraulic cylinder 21 and 2 lift hydraulic cylinders 11) can simultaneously output different force values to simulate the state of combined action of thrust and lift generated during the operation of the engine 04, and a single hydraulic cylinder can also respectively output or any hydraulic cylinder can be combined to output a component simulating a certain force to influence the whole measuring system.
The in-situ loading verification system of the embodiment realizes in-situ calibration in the installation state of the engine 04. By F x2 、F y1 、F y2 The three position forces are loaded respectively and simultaneously, and the axial thrust, the lift force and the pitching moment generated by the real working state of the engine 04 are simulated; meanwhile, in the calibration process, the force transmission loss of the connecting pipeline, the cable and the force transmission loss from the engine 04 to the force transducer are taken into consideration, and the obtained calibration coefficient is closer to the real stress state of the engine 04.
Normal loading through 2 lift loading assemblies 1 arranged one behind the other (F) y1 、F y3 ) Axial loading through a thrust loading assembly 2 connected to the thrust frame, as shown in figure 1, by calculation of the loading values and the measured output values, 3 standard forces (F) are obtained x2 、F y1 、F y3 ) And measuring the calibration relation of the force, converting the actual stress of the engine into a force system expressed by standard force, wherein the specific loading calibration method comprises the following steps:
1) the engine is arranged on a thrust movable frame 02 (a supply pipeline and a cable are arranged), a thrust loading assembly 2 is connected with the tail of the engine through a thrust checking tool 3, the thrust loading assembly 2 is loaded along the axial direction of the engine 04, and a lift loading assembly 1 is loaded along the normal direction of the engine 04;
2) establishing a thrust verification model
The following thrust check formula is established according to the first-order fitting relationship of the three measured force values F1, F2 and F3 of the measuring force sensor 03 and three standard forces (axial loading force Fx2, normal loading force Fy1 and Fy 3):
3) solving constant term and coefficient matrix A
a) The hydraulic station 5 applies power to the thrust hydraulic cylinder 21, and the control unit adjusts the magnitude of the power provided by the hydraulic station 5 to the thrust hydraulic cylinder 21 in real time according to the force value of the thrust standard force sensor 221 until the force value F of the thrust standard force sensor 221 x2 The force value is equal to the standard force value to be loaded, and three measuring force sensors 03 of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a And loaded with a series of standard forces F x2 Obtaining a series of measured forces F 1 、F 2 、F 3 Outputting a series of standard forces F x2 And a series of measured forces F 1 、F 2 、F 3 Substituting into a thrust check formula, and obtaining a constant item F through data calculation 02 And the second column coefficient of the matrix A
b) The hydraulic station 5 applies power to one of the lift cylinders 11, and the control unit is based on the lift criteria associated with that lift cylinder 11The force value of the force sensor 121 adjusts the power supplied by the hydraulic station 5 to the lift hydraulic cylinder 11 in real time until the force value F of the lift standard force sensor 121 y1 The force value is equal to the standard force value to be loaded, and three measuring force sensors 03 of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Load a series of standard forces F y1 Obtaining a series of measured forces F 1 、F 2 、F 3 Outputting a series of standard forces F y1 And a series of measured forces F 1 、F 2 、F 3 Substituting into a thrust check formula, and obtaining a constant item F through data calculation 01 And the first column coefficient of matrix A
c) The hydraulic station 5 applies power to the other lift hydraulic cylinder 11, and the control unit adjusts the power provided by the hydraulic station 5 to the lift hydraulic cylinder 11 in real time according to the force value of the lift standard force sensor 121 matched with the lift hydraulic cylinder 11 until the force value F of the lift standard force sensor 121 y3 The force value is equal to the standard force value to be loaded, and three measuring force sensors 03 of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Load a series of standard forces F y3 Obtaining a series of measured forces F 1 、F 2 、F 3 And (6) outputting. Applying a series of standard forces F y3 And a series of measured forces F 1 、F 2 、F 3 Substituting into a thrust check formula, and obtaining a constant item F through data calculation 03 And the third column coefficients of matrix a;
4) expression for obtaining output value of standard force sensor
According to
Obtaining a matrix A and according to a constant term F 02 、F 01 、F 03 The matrix A is used for performing matrix transformation on the thrust verification formula to obtain an expression of the output value of the standard force sensor expressed by the output value of the measuring force sensor 03;
wherein i is 1,2, 3; j is 1,2, 3;
5) expression for checking output value of standard force sensor
The hydraulic station 5 simultaneously applies power F to the thrust hydraulic cylinders 21 and the 2 lift hydraulic cylinders 11 y1 And 3 three standard forces are loaded simultaneously according to the numerical values (F) of the 1 thrust standard force sensor 221 and the 2 lift standard force sensors 121 x2 ˊ、F y1 ˊ、F y3 ' and 3 values F of the measuring force sensor 03 1 ″、F 2 ″、F 3 Verifying the accuracy of the expression in the step 5) under the condition that the three force components interfere with each other, specifically as follows:
measuring values F of three measuring force sensors 03 of a three-component force measuring device 1 ″、F 2 ″、F 3 Substituting the expression of the step 4) to calculate the calculation standard force F x2 ″、F y1 ″、F y3 ", the standard force F will be calculated x2 ″、F y1 ″、F y3 "with the thrust reference force sensor 221 and the 2 measurements F of the lift reference force sensor 121 x2 ˊ、F y1 ˊ、F y3 Comparing;
if the two values are equal to each other, F x2 ″＝F x2 ˊF y1 ″＝F y1 And F y3 ″＝F y3 When 'is' the expression in the step 5) is accurate, executing the step 6), if the expression is not equal to the expression in the step 3), returning to the step of reloading the force, and re-determining the expression;
6) in the process of actually measuring the stress of the engine, three measuring force sensors 03 of the three-component force measuring device respectively obtain force F 1 * 、F 2 * 、F 3 * Substituting into the expression in the step 4) to obtain the stress of the engine, which specifically comprises the following steps:
the actual thrust force of the engine: f x2 * ；
Engine deviceThe lift force is applied: f y1 * +F y3 * ；
Pitching moment actually suffered by the engine: f y1 * ×X 1 +F y3 * ×X 3 Wherein X is 1 Is F y1 * Arm of force, X 3 Is F y3 * Force arm.
In the embodiment, the calibration coefficient of the three-component force measuring device is obtained by calibrating the three-component force measuring device through the loading calibration system, the output result of the measuring sensor in the test process can be converted into the axial thrust, the lift force and the pitching moment of the engine through the calibration coefficient, and because the calibration system is used in the installation state of the engine, the influence factors such as the constraint of a supply pipeline, the central deviation of the engine and the measuring system and the like are included, and the force borne by the engine can be reflected more truly.
The above description is only for the purpose of describing the preferred embodiments of the present invention and does not limit the technical solutions of the present invention, and any known modifications made by those skilled in the art based on the main technical concepts of the present invention fall within the technical scope of the present invention.
Claims (7)
1. The utility model provides an in situ loading calibration system for three-component force measuring device, three-component force measuring device is including thrust stationary barrier (01), thrust movable barrier (02) and three measurement force transducer (03), is used for placing engine (04) on thrust movable barrier (02), its characterized in that:
the in-situ loading verification system comprises a loading mechanism, a hydraulic station (5) and a control unit (6);
the loading mechanism comprises 1 thrust loading assembly (2) arranged horizontally and 2 lifting loading assemblies (1) arranged vertically;
the thrust loading assembly (2) comprises a thrust hydraulic cylinder (21) and a thrust force measuring element (22), the thrust hydraulic cylinder (21) is arranged on the thrust fixed frame (01) through a thrust verification support (4), one end of the thrust force measuring element (22) is connected with a piston rod of the thrust hydraulic cylinder (21), and the other end of the thrust force measuring element is used for being connected with the tail of the engine (04);
the 2 lift force loading assemblies (1) are arranged side by side along the axis direction of the engine (04), each lift force loading assembly (1) comprises a lift force hydraulic cylinder (11) and a lift force measuring element (12), the lift force hydraulic cylinders (11) are arranged on the thrust fixed frame (01), one end of each lift force measuring element (12) is connected with a piston rod of each lift force hydraulic cylinder (11), and the other end of each lift force measuring element is connected with the thrust movable frame (02);
the hydraulic station (5) is used for providing power for the thrust hydraulic cylinder (21) and the lift hydraulic cylinder (11);
the control unit (6) is used for adjusting the power provided by the hydraulic station (5) to the thrust hydraulic cylinder (21) in real time according to the force value of the thrust force measuring element (22) so that the force value of the thrust force measuring element (22) is equal to the standard force value required to be loaded; and the hydraulic station (5) is used for adjusting the power provided by the hydraulic station (5) to the lift hydraulic cylinder (11) in real time according to the force value of the lift force measuring element (12), so that the force value of the lift force measuring element (12) is equal to the standard force value required to be loaded.
2. The in-situ loading verification system for a three-component force-measuring device of claim 1, wherein: the thrust force measuring element (22) comprises a thrust standard force sensor (221) and 2 thrust flexible parts (222), one end of each thrust flexible part (222) is connected with two ends of the corresponding thrust standard force sensor (221), the other end of one thrust flexible part (222) is connected with a piston rod of the thrust hydraulic cylinder (21), and the other end of the other thrust flexible part (222) is connected with the tail of the engine (04).
3. The in-situ loading verification system for a three-component force-measuring device of claim 2, wherein: the lift force measuring element (12) comprises lift force standard force sensors (121) and 2 lift force flexible pieces (122), one ends of the 2 lift force flexible pieces (122) are respectively connected with two ends of the lift force standard force sensors (121), the other end of one lift force flexible piece (122) is connected with a piston rod of the lift force hydraulic cylinder (11), and the other end of the other lift force flexible piece (122) is connected with the thrust movable frame (02).
4. An in-situ loading verification system for a three-component force-measuring device according to any of claims 1 to 3, wherein: the thrust standard force sensor (221) and the lift standard force sensor (121) are the same in structure and are both s-shaped tension and compression bidirectional force sensors.
5. The in-situ loading verification system for a three-component force-measuring device of claim 4, wherein: the thrust flexible piece (222) and the lifting flexible piece (122) have the same structure and are universal flexible pieces.
6. The in-situ loading verification system for a three-component force-measuring device of claim 5, wherein: a first servo valve (51) is arranged between the hydraulic station (5) and the thrust hydraulic cylinder (21), and second servo valves (52) are arranged between the hydraulic station (5) and the 2 lift hydraulic cylinders (11);
the control unit (6) comprises a controller for receiving the signal of the thrust reference force sensor (221) and controlling the opening of the first servo valve (51) according to the signal, and for receiving the signal of the lift reference force sensor (121) and controlling the opening of the second servo valve (52) according to the signal.
7. An in-situ loading verification method for a three-component force-measuring device, characterized in that the in-situ loading verification system for a three-component force-measuring device of claim 1 is employed, the verification method comprising the steps of:
1) the engine (04) is installed on the thrust moving frame (02), the thrust loading assembly (2) is connected with the tail of the engine (04), the thrust loading assembly (2) loads along the axial direction of the engine (04), and the lift loading assembly (1) loads along the normal direction of the engine (04);
2) establishing a thrust verification model
The following thrust check formula is established according to the first-order fitting relationship between the three measured force values F1, F2 and F3 of the measured force sensor 03 and the three standard loading forces Fx2, Fy1 and Fy 3:
3) solving for the constant term F 0 Sum coefficient matrix A
a) The hydraulic station (5) applies power to the thrust hydraulic cylinder (21), and the control unit (6) adjusts the power provided by the hydraulic station (5) to the thrust hydraulic cylinder (21) in real time according to the force value of the thrust force measuring element (22) until the force value F of the thrust force measuring element (22) x2 Equal to the standard force value to be loaded, three measuring force sensors (03) of the three-component force measuring device respectively obtain a force F 1 、F 2 、F 3 (ii) a Loading multiple Fs x2 To obtain multiple sets of measuring forces F 1 、F 2 、F 3 A plurality of F x2 And sets of measurement forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 02 And of matrix A
b) The hydraulic station (5) applies power to one of the lift force hydraulic cylinders (11), and the control unit (6) adjusts the power provided by the hydraulic station (5) to the thrust hydraulic cylinder (21) in real time according to the force value of the lift force measuring element (12) matched with the lift force hydraulic cylinder (11) until the force value F of the thrust force measuring element (22) y1 The force value is equal to the standard force value to be loaded, and three measuring force sensors (03) of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Loading multiple Fs y1 To obtain multiple sets of measuring forces F 1 、F 2 、F 3 A plurality of F y1 And sets of measurement forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 01 And of matrix A
c) The hydraulic station (5) applies power to the other lift force hydraulic cylinder (11), and the control unit (6) adjusts the liquid in real time according to the force value of the lift force measuring element (12) matched with the lift force hydraulic cylinder (11)The pressure station (5) provides power to the thrust hydraulic cylinder (21) until the force value F of the thrust force measuring element (22) y3 The force value is equal to the standard force value to be loaded, and three measuring force sensors (03) of the three-component force measuring device respectively obtain force F 1 、F 2 、F 3 (ii) a Loading multiple Fs y3 Obtaining multiple sets of measured forces F 1 、F 2 、F 3 A plurality of F y3 And sets of measurement forces F 1 、F 2 、F 3 Substituting the thrust check formula to obtain a constant term F 03 And of matrix A
4) Expression for obtaining output value of standard force sensor
According to
Obtaining a matrix A and according to a constant term F 02 、F 01 、F 03 And obtaining an expression of the output value of the standard force sensor by the matrix A:
wherein i is 1,2, 3; j is 1,2, 3;
5) expression for checking output value of standard force sensor
The hydraulic station (5) simultaneously applies a force F to the thrust hydraulic cylinder (21) x2 ' and 2 lift hydraulic cylinders (11) apply a force F y1 ˊ、F y3 ' measuring the three measuring force sensors (03) of the three-component force measuring device to obtain measured values F 1 ″、F 2 ″、F 3 Substituting the expression of the step 4) to calculate the calculation standard force F x2 ″、F y1 ″、F y3 ", the standard force F will be calculated x2 ″、F y1 ″、F y3 "with application of force F x2 ˊ、F y1 ˊ、F y3 Comparing the force values;
if the two numerical values are correspondingly equal, the expression in the step 5) is accurate, and if the two numerical values are not equal, the step 3) is returned to reload the force.
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