Hydraulic impact load amplitude test device and correction method

Abstract

The application belongs to the field of impact load test of aircraft parts, and particularly relates to a hydraulic impact load amplitude test device and a correction method, which comprises: an actuating cylinder hinged to a wall surface, an output shaft of the actuating cylinder being provided with a force sensor, the force sensor being connected with a test piece; the actuating cylinder is connected with an oil source through an actuating cylinder pipeline; the actuating cylinder is further provided with a displacement sensor, the force sensor is further provided with a first acceleration sensor, and the method overall scheme separately corrects the impact force sensor, an adapter and the test piece. Finally, the results are superposed to correct the influence of inertial force on the impact load.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of impact load test of aircraft parts, and particularly relates to a hydraulic impact load amplitude test device and a correction method. BACKGROUND

[0002] Aero-engines will bear impact load under some extreme conditions, and impact load test of engine parts is usually carried out to examine the impact resistance of the parts, so as to carry out impact resistance verification of the parts in advance of major tests such as whole machine containment test, and provide an effective verification means for structure improvement of the parts.

[0003] During the impact load test of a structural part, the test piece is usually a flexible member, and a certain deformation will be generated in the test piece during the loading process, and the deformation will generate a large acceleration. In addition, for the impact load of the structural part, a connecting piece is usually installed between the force sensor and the loading position of the structural part, which is used to transmit the impact force, and the connecting piece generates displacement and acceleration along with the test piece. The accelerations of the test piece and the connecting piece will affect the impact force transmitted to the test piece, resulting in errors.

[0004] The present application solves two technical problems: 1) the force sensor itself bears different accelerations and motion displacements under large load impact conditions, which may cause deviation between the sensor indication and the actual acting force, and load correction is needed. 2) a connecting piece is usually used to connect the force sensor and the test piece in the test, and the connecting piece will generate inertial force due to acceleration while transmitting the impact load, which will affect the impact force and cause impact force test error.

[0005] The present application proposes a continuous frequency controllable impact load peak correction method combined with a controllable impact actuator. SUMMARY

[0006] The present application solves two technical problems: the force sensor itself bears different accelerations and motion displacements under large load impact conditions, which may cause deviation between the sensor indication and the actual acting force, and load correction is needed. A connecting piece is usually used to connect the force sensor and the test piece in the test, and the connecting piece will generate inertial force due to acceleration while transmitting the impact load, which will affect the impact force and cause impact force test error. The present application provides a hydraulic impact load amplitude test device, which comprises:

[0007] The actuating cylinder is hinged to the wall surface, the output shaft of the actuating cylinder is provided with a force sensor, the force sensor is connected with the test piece, the actuating cylinder is connected with an oil source through an actuating cylinder pipeline, the actuating cylinder is further provided with a displacement sensor, and the force sensor is further provided with a first acceleration sensor.

[0008] Preferably, the actuator pipe is connected to a valve, the valve is connected to a controller and the controller controls the valve size, and the controller is also connected to a force sensor and a displacement sensor to receive signals from the force sensor and the displacement sensor.

[0009] Preferably, the force sensor is connected to the test specimen via an adapter, and the adapter is equipped with a second acceleration sensor.

[0010] A method for correcting the amplitude of hydraulic impact loads, employing a hydraulic impact load amplitude testing device.

[0011] Step S1: Apply an impact force to the force sensor and the test piece through the actuating cylinder, and obtain the uncorrected impact force F generated by the equivalent mass of the sensor through the reading of the force sensor. 示 ;

[0012] Step S2: Remove the test piece, apply an impact force to the force sensor through the actuating cylinder, and obtain the inertial force F generated by the equivalent mass of the force sensor by measuring the reading of the force sensor. 传惯 The acceleration a reading from the first accelerometer. 传 ;

[0013] Step S3: Establish F 传惯 With acceleration a 传 The changing relationship curve: F 传惯 ;

[0014] Step S4: Through the relationship curve F 传惯 The original impact force F was corrected. 示 The corrected impact force F of the test specimen was obtained. 冲 .

[0015] Preferably, the impact force F before correction is corrected. 示 The specific method is as follows: obtain the impact force F 冲 The corresponding experimental acceleration, based on the relationship curve F 传惯 Obtain the experimental acceleration and acceleration a. 传 When they are the same, the corresponding F 传惯 The impact force F before correction 示 Subtract the corresponding F 传惯 Obtain the corrected impact force F 冲 .

[0016] A method for correcting the amplitude of a hydraulic impact load, employing a hydraulic impact load amplitude testing device, the method comprising:

[0017] Step S1: Apply impact force to the force sensor, test piece, and adapter through the actuating cylinder, and obtain the uncorrected impact force F generated by the equivalent mass of the force sensor through the reading of the force sensor. 示 ;

[0018] Step S2: remove the test piece, apply impact force to the force sensor and adapter by the actuator, and obtain the inertia force F generated by the equivalent mass of the force sensor through the reading of the force sensor 传转惯 and the reading of the first acceleration sensor 传 ;

[0019] Step S3: establish the relationship curve F 传转惯 versus the acceleration a 传 ; 传转惯 ;

[0020] Step S4: correct the pre-correction impact force F 传转惯 based on the relationship curve F 示 , and obtain the corrected impact force F 冲 .

[0021] Preferably, the method for correcting the pre-correction impact force F 示 is specifically: obtaining the impact force F 冲 corresponding to the test acceleration, obtaining the F 传转惯 corresponding to the acceleration a 传 based on the relationship curve F 传转惯 , and obtaining the corrected impact force F 示 by subtracting the corresponding F 传转惯 from the pre-correction impact force F 冲 .

[0022] A hydraulic impact load amplitude correction method, which uses a hydraulic impact load amplitude test device, and the method comprises the following steps:

[0023] Step S1: apply impact force to the force sensor, test piece and adapter by the actuator, and obtain the pre-correction impact force F 示 generated by the equivalent mass of the sensor through the reading of the force sensor;

[0024] Step S2: remove the test piece, apply impact force to the force sensor and adapter by the actuator, and obtain the inertia force F 传转惯 generated by the equivalent mass of the force sensor through the reading of the force sensor 转 and the reading of the second acceleration sensor; and establish the relationship curve F 传转惯 ;

[0025] Step S3: remove the adapter, apply impact force to the force sensor by the actuator, and obtain the inertia force F 传惯 generated by the equivalent mass of the force sensor through the reading of the force sensor 传 and the reading of the first acceleration sensor; and establish the relationship curve F 传惯 ;

[0026] Step S4: based on the relationship curve F 传转惯 with the relationship curve F 传惯 , the inertia force F 转惯 of the adapter 转 with the relationship curve F 转惯 ;

[0027] Step S4: through the relationship curve F 转惯 with the relationship curve F 传惯 correct the pre-correction impact force F 示 , to obtain the corrected impact force F 冲 of the test piece.

[0028] Preferably, the method for correcting the pre-correction impact force F 示 is specifically: obtaining the impact force F 冲 corresponding to the test acceleration, based on the relationship curve F 转惯 , obtaining the F 传 corresponding to the test acceleration and acceleration a 转惯 , obtaining the F 传 corresponding to the test acceleration and acceleration a 传惯 , subtracting the corresponding F 示 , the corresponding F 传惯 , the pre-correction impact force F 转惯 , and obtaining the corrected impact force F 冲 .

[0029] The advantages of the present application include:

[0030] 1. The hydraulic impact actuator as an impact loading device has the advantages of large load impact, fast speed, etc., and the most characteristic is that a closed-loop control system is formed by using a controller, a valve, a force sensor, etc. The sensor feeds back the impact force to the controller, and the controller outputs a control command to the valve to load or unload. The speed and acceleration of the piston rod movement of the impact actuator can be controlled.

[0031] 2. Before impact loading, the impact load calibration based on the actuator has the advantage of continuous frequency calibration, so as to obtain an impact load test correction method of the force sensor varying with frequency.

[0032] 3. Through the present application, the impact load test precision problem can be solved from the above two aspects at the same time. One is to solve the problem of precision change of the sensor itself with frequency, and the other is to solve the correction problem of the inertia force caused by the mass of the adapter. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a test installation drawing of a hydraulic impact load amplitude test device according to a preferred embodiment of the present application;

[0034] Figure 2 Figure 1 is a schematic diagram of a hydraulic impact load amplitude correction method according to an embodiment of the present application.

[0035] 1 - oil source; 2 - valve input pipeline; 3 - valve; 4 - actuator cylinder pipeline; 5 - actuator cylinder base; 6 - actuator cylinder; 7 - force sensor; 8 - first acceleration sensor; 9 - adapter; 10 - second acceleration sensor; 11 - test piece; 12 - third acceleration sensor; 13 - controller; 14 - valve command signal line; 15 - displacement sensor feedback signal line; 16 - force sensor feedback signal line; 17 - displacement sensor. DETAILED DESCRIPTION

[0036] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings. In the drawings, the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all of the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0037] The present application provides a hydraulic impact load amplitude test device, which comprises:

[0038] The actuator cylinder 6 is hinged to the wall surface, and the output shaft of the actuator cylinder 6 is provided with a force sensor 7, which is connected to the test piece 11. The actuator cylinder 6 is connected to the oil source 1 through the actuator cylinder pipeline 4. The actuator cylinder 6 is also provided with a displacement sensor 17, and the force sensor 7 is also provided with a first acceleration sensor 8.

[0039] Preferably, the actuator cylinder pipeline 4 is connected with a valve 3, the valve 3 is connected with a controller 13 and the valve size is controlled by the controller 13. The controller 13 is also connected with the force sensor 7 and the displacement sensor 17 to receive signals from the force sensor 7 and the displacement sensor 17.

[0040] Preferably, the force sensor 7 and the test piece 11 are connected through an adapter 9, and the adapter 9 is provided with a second acceleration sensor.

[0041] Embodiment one: a hydraulic impact load amplitude correction method, which adopts a hydraulic impact load amplitude test device,

[0042] During the impact process, in addition to the rapid impact force applied by the actuator, the sensor also experiences acceleration due to the deformation of the test piece, which in turn generates an inertial force on the sensor, affecting the impact force reading F on the force sensor. 示 Including the influence of inertial forces, the true reading of the sensor should exclude the influence of inertial forces.

[0043] The inertial force F generated by the equivalent mass of the sensor 传惯 The equivalent mass m of the inertial force generated by the sensor 传 It can be expressed as F 传惯 =m 传 a 传 Because the strain gauge in a strain gauge-type force sensor is installed in the middle of the sensor, not all of the sensor's inertial force is transmitted to the strain gauge and generates a response. Therefore, the equivalent mass m of the sensor is used. 传 This represents the mass that generates inertial force. It can be seen that the equivalent mass m... 传 It is difficult to measure, but the active impact actuator of this invention can achieve acceleration-controlled loading without the need for test pieces and adapters (i.e., Figure 1 Without installing adapter 9 and test piece 11, record the applied acceleration and the corresponding sensor readings to obtain F. 传惯 With acceleration a 传 The changing relationship curve: F 传惯 (a 传 );

[0044] Through the relationship curve F 传惯 (a 传 The original impact force F was corrected. 示 The corrected impact force F of the test specimen was obtained. 冲 .

[0045] Preferably, the impact force F before correction is corrected. 示 The specific method is as follows: obtain the impact force F 冲 The corresponding experimental acceleration, based on the relationship curve F 传惯 (a 传 ), obtain the test acceleration and acceleration a 传 When they are the same, the corresponding F 传惯 The impact force F before correction 示 Subtract the corresponding F 传惯 Obtain the corrected impact force F 冲 .

[0046] Example 2: A method for correcting the amplitude of a hydraulic impact load, using a hydraulic impact load amplitude testing device, the method comprising:

[0047] Step S1: Apply an impact force to the force sensor 7, test piece 11, and adapter 9 through the actuating cylinder 6, and obtain the uncorrected impact force F generated by the equivalent mass of the sensor through the reading of the force sensor 7. 示 ;

[0048] Step S2: Remove test piece 11, apply impact force to force sensor 7 and adapter 9 through actuator 6, and obtain the inertial force F generated by the equivalent mass of force sensor through the reading of force sensor 7. 传转惯 The acceleration a reading from the first acceleration sensor 8 传 ;

[0049] Step S3: Establish F 传转惯 With acceleration a 传 The relationship curve of change: F 传转惯 (a 传 The principle is: connect the adapter to the sensor without installing the test piece (i.e., ...). Figure 1 In the test piece 11), the force sensor is not under load from the test piece, but only under the inertial force of the force sensor and the adapter. The impact force reading of the force sensor is the force at acceleration a. 传 The inertial force correction value generated under the action. Similarly, the common inertial force correction result (F) for both the force sensor and the adapter can be obtained. 传转惯 With acceleration a 传 (Relationship curve of change):

[0050] Step S4: Through the relationship curve F 传转惯 (a 传 The original impact force F was corrected. 示 The corrected impact force F of the test specimen was obtained. 冲 .

[0051] Preferably, the impact force F before correction is corrected. 示 The specific method is as follows: Obtain the impact force F 冲 The corresponding experimental acceleration, based on the relationship curve F 传转惯 (a 传 ), obtain the test acceleration and acceleration a 传 When they are the same, the corresponding F 传转惯 The impact force F before correction 示 Subtract the corresponding F 传转惯 Obtain the corrected impact force F 冲 .

[0052] Example 3: A method for correcting the amplitude of a hydraulic impact load, using a hydraulic impact load amplitude testing device, the method comprising:

[0053] Step S1: Apply impact force to force sensor 7, test piece 11 and adapter 9 by actuator 6, and obtain the impact force F before correction generated by the equivalent mass of sensor through the reading of force sensor 7 示 ;

[0054] Step S2: Remove test piece 11, apply impact force to force sensor 7 and adapter 9 by actuator 6, and obtain the inertia force F generated by the equivalent mass of force sensor through the reading of force sensor 7 传转惯 and the reading of second acceleration sensor 10 to establish the relationship curve F 转 (a 传转惯 ) and establish the relationship curve F 转 (a 传惯 ) between inertia force F and acceleration a 传 of first acceleration sensor 8

[0055] Step S3: Remove adapter 9, apply impact force to force sensor 7 by actuator 6, and obtain the inertia force F generated by the equivalent mass of force sensor through the reading of force sensor 7 传惯 and the reading of first acceleration sensor 8 to establish the relationship curve F 传 (a 传转惯 ) between inertia force F and acceleration a 转 of adapter 9

[0056] Step S4: Based on the relationship curve F 传惯 (a 传 ) and the relationship curve F 转惯 (a 转 ), fit the relationship curve F 转惯 (a 转 ) between inertia force F and acceleration a 转惯 of adapter 9

[0057] Step S4: Correct the impact force F 转 before correction through the relationship curve F 传惯 (a 传 ) and the relationship curve F 示 (a 冲 ) to obtain the corrected impact force F 示 of test piece.

[0058] Preferably, the method for correcting the impact force F 冲 before correction is specifically: obtaining the test acceleration corresponding to impact force F 转惯 , obtaining the F 转 corresponding to the test acceleration and acceleration a 传 at the same time based on the relationship curve F 转惯 (a 传 ), obtaining the F 传惯 corresponding to the test acceleration and acceleration a 示Subtract the corresponding F 传惯 , the corresponding F 转惯 , to obtain the corrected impact force F 冲 .

[0059] The relationship between the inertia force of the test piece itself and the inertia force correction of the sensor

[0060] During the test, the deformation of the test piece itself will cause part of its mass (the equivalent mass of the inertia force of the test piece) to generate an inertia force under the action of acceleration, which acts on the sensor. That is:

[0061] F 试惯 = m 试 a 试 = F 试惯 (a 试 );

[0062] The corresponding true impact force acting on the test piece is:

[0063] F 冲 = F 示 -F 传转惯 (a 传 )-F 试惯 (a 试 )

[0064] Or F 冲 = F 示 -F 传惯 (a 传 )-F 转惯 (a 转 )-F 试惯 (a 试 );

[0065] In order to simulate the installation condition of the test piece, the installation position of the test piece is usually fixed and constrained, and not all the mass of the test piece generates the same inertia force, so the equivalent mass m 试 is also difficult to obtain directly.

[0066] It should be noted that the inertia force correction result of the test piece itself is recommended not to be used as a correction of the impact force of the sensor, but only as a content of response analysis of the impact force borne by the test piece. Because from the perspective of test impact force loading, the inertia force of the test piece belongs to its own response to the impact force, and this part of the inertia force should not be deducted from the sensor. Therefore, the relationship between the inertia force of the test piece itself and the inertia force correction of the sensor is described.

[0067] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hydraulic impact load amplitude correction method, characterized by, The hydraulic impact load amplitude test device comprises: The actuating cylinder (6) is hinged to the wall surface, and the output shaft of the actuating cylinder (6) is provided with a force sensor (7); the force sensor (7) is connected with a test piece (11); the actuating cylinder (6) is connected with an oil source (1) through an actuating cylinder pipeline (4); the actuating cylinder (6) is further provided with a displacement sensor (17); the force sensor (7) is further provided with a first acceleration sensor (8); the actuating cylinder pipeline (4) is connected with a valve (3); the valve (3) is connected with a controller (13) and controls the valve size; the controller (13) is further connected with the force sensor (7) and the displacement sensor (17) and is used for receiving signals of the force sensor (7) and the displacement sensor (17); The force sensor (7) and the test piece (11) are connected through a switching piece (9), and the switching piece (9) is provided with a second acceleration sensor; The method comprises: Step S1: Apply impact force to the force sensor (7), the test piece (11), and the adapter (9) by the actuator (6), and acquire the impact force F before correction generated by the equivalent mass of the sensor through the indication of the force sensor (7) 示 ; Step S2: remove the test piece (11), apply impact force to the force sensor (7) and the adapter (9) through the actuator (6), and obtain the inertial force F generated by the equivalent mass of the force sensor through the reading of the force sensor 传转惯 The reading acceleration a of the first acceleration sensor (8) 传 ; Step S3: Establish F 传转惯 With acceleration a 传 Relationship curve: F 传转惯 (a 传 ); Step S4: obtaining the impact force F 传转惯 (a 传 ) correcting the impact force F 示 , to obtain the corrected impact force F 冲 of the test piece The method for correcting the impact force F 示 before correction is specifically: obtaining the impact force F 冲 corresponding to the test acceleration based on the relationship curve F 传转惯 (a 传 ), obtaining the F 传 corresponding to the test acceleration and the acceleration a 传转惯 at the same time, subtracting the corresponding F 示 from the impact force F 传转惯 before correction to obtain the corrected impact force F 冲 .

2. A hydraulic impact load amplitude correction method, characterized by, The hydraulic impact load amplitude test device comprises: The actuating cylinder (6) is hinged to the wall surface, and the output shaft of the actuating cylinder (6) is provided with a force sensor (7); the force sensor (7) is connected with a test piece (11); the actuating cylinder (6) is connected with an oil source (1) through an actuating cylinder pipeline (4); the actuating cylinder (6) is further provided with a displacement sensor (17); the force sensor (7) is further provided with a first acceleration sensor (8); the actuating cylinder pipeline (4) is connected with a valve (3); the valve (3) is connected with a controller (13) and controls the valve size; the controller (13) is further connected with the force sensor (7) and the displacement sensor (17) and is used for receiving signals of the force sensor (7) and the displacement sensor (17); The force sensor (7) and the test piece (11) are connected through a switching piece (9), and the switching piece (9) is provided with a second acceleration sensor; The method comprises: Step S1: Apply impact force to the force sensor (7), the test piece (11), and the adapter (9) by the actuator (6), and acquire the impact force F before correction generated by the equivalent mass of the sensor from the indication of the force sensor (7) 示 ; Step S2: remove the test piece (11), apply impact force to the force sensor (7) and the adapter (9) through the actuator (6), and obtain the inertia force F generated by the equivalent mass of the force sensor through the indication of the force sensor 传转惯 The acceleration a indicated by the second acceleration sensor (10) 转 ; and establish a relationship curve F 传转惯 (a 转 ) Step S3: remove the adapter (9), apply impact force to the force sensor (7) through the actuator (6), and obtain the inertial force F generated by the equivalent mass of the force sensor (7) through the indication of the force sensor (7) 传惯 The indicated acceleration a of the first acceleration sensor (8) 传 ; and establish a relationship curve F 传惯 (a 传 ) Step S4: Based on the relationship curve F 传转惯 (a) 转 ) and the relationship curve F 传惯 (a) 传 The inertial force F of the fitting adapter (9) 转惯 The acceleration a of the adapter (9) 转 Relationship curve F 转惯 (a) 转 ); Step S4: correcting the impact force F 转惯 (a 转 ) by the relationship curve F 传惯 (a 传 ) to obtain the corrected impact force F 示 of the test piece 冲 ; The original impact force F was corrected. 示 The specific method is as follows: obtain the impact force F 冲 The corresponding experimental acceleration, based on the relationship curve F 转惯 (a) 转 ), to obtain the experimental acceleration and acceleration a 传 When they are the same, the corresponding F 转惯 Obtain the experimental acceleration and acceleration a. 传 When they are the same, the corresponding F 传惯 The impact force F before correction will be corrected. 示 Subtract the corresponding F 传惯 The corresponding F 转惯 The corrected impact force F is obtained. 冲 .

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