CN112014044A - Static stiffness tester and static stiffness testing method - Google Patents
Static stiffness tester and static stiffness testing method Download PDFInfo
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- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
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- G—PHYSICS
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Abstract
The invention discloses a static stiffness tester and a static stiffness test method, which are used for measuring static stiffness of an elastic supporting part, wherein the static stiffness tester comprises a fixing device, a loading device and a detection device, the mounting end of the loading device is fixed at the elastic supporting end of the elastic supporting part, the detection device comprises an eddy current displacement sensor and a voltage detection module, static load is loaded through the loading end of the loading device, so that the mounting end of the loading device generates displacement along the loading direction, the elastic supporting end of the elastic supporting part generates elastic deformation along the loading direction, and the voltage increment of the eddy current displacement sensor is measured through the voltage detection module, so that the displacement increment of the mounting end of the loading device along the loading direction is obtained according to the voltage increment of the eddy current displacement sensor and the load increment applied by the loading device, and then the elastic supporting zero-load increment is obtained according to the displacement increment of the mounting end of the loading device along the loading direction and the static load applied by the loading device Static stiffness of the member.
Description
Technical Field
The invention relates to the technical field of elastic support part machining, in particular to a static stiffness tester and a static stiffness testing method.
Background
The elastic supporting parts are designed by adopting an elastic damping supporting structure in the aircraft engine and also comprise squirrel-cage elastic supports, when the aircraft engine runs normally, the deformation of the elastic supports and the internal resistance of materials of the elastic supports can play a certain role in damping the rotor system, the more important role is to adjust the critical rotating speed of the rotor system, the rigidity of the rotor system has important influence on the dynamic characteristics of the rotor-bearing, serious accidents can be caused even due to unqualified rigidity, and the rigidity of the elastic supporting parts comprises static rigidity and dynamic rigidity. At present, the influence of the tolerance range of the machining dimension of an elastic support part on the static rigidity of the part is large, after the actually machined part is subjected to a static rigidity test, the test value of the static rigidity is deviated from the design value of the static rigidity, the static rigidity of the part needs to be adjusted by means of repair and the like, but the static rigidity error measured by the existing static rigidity tester is large, so that whether the deviation between the actual value of the static rigidity and the design value of the static rigidity of the part meets the requirement or not is difficult to judge.
Disclosure of Invention
The invention provides a static stiffness tester and a static stiffness testing method, which aim to solve the technical problem that an elastic supporting part has a larger static stiffness error measured by the conventional static stiffness tester.
According to an aspect of the present invention, there is provided a static stiffness tester for measuring static stiffness of an elastic support part, the static stiffness tester comprising a fixing device for simulating an actual application environment of the elastic support part and fixing a mounting end of the elastic support part, a loading device for loading a static load on an elastic support end of the elastic support part, and a detecting device for measuring static stiffness of the elastic support part according to the static load applied by the loading device and elastic deformation generated in a loading direction by the elastic support end of the elastic support part, the mounting end of the loading device being fixed to the elastic support end of the elastic support part, the detecting device comprising an eddy current displacement sensor having a probe end abutting against the mounting end of the loading device in the loading direction and a voltage detecting module connected to the eddy current displacement sensor and used for detecting a voltage change of the eddy current displacement sensor during loading, the static load is loaded through the loading end of the loading device, so that the mounting end of the loading device generates displacement along the loading direction, the elastic support end of the elastic support part generates elastic deformation along the loading direction, the probe end of the eddy current displacement sensor is driven by the mounting end of the loading device to synchronously move along the loading direction to increase the voltage, the voltage increment of the eddy current displacement sensor is measured through the voltage detection module, the displacement increment of the mounting end of the loading device along the loading direction is obtained according to the voltage increment of the eddy current displacement sensor and the load increment applied by the loading device, and the static rigidity of the elastic support part is obtained according to the displacement increment of the mounting end of the loading device along the loading direction and the static load increment applied by the loading device.
Further, the fixing device comprises a fixing platform, a rigid seat arranged on the fixing platform and a pressing ring used for pressing and fixing the mounting end of the elastic supporting part on the rigid seat.
Further, the loading device comprises a loading ring sleeved on the elastic supporting end of the elastic supporting part and a tray hung on the loading ring and used for placing weights to apply loads.
Furthermore, the tray is hung on a loading ring through a hook, and a nylon rope ring for installing the hook is arranged on the loading ring.
Furthermore, the detection device also comprises a data analysis processing module which is connected with the voltage detection module and is used for obtaining the static rigidity of the elastic supporting part after analysis processing is carried out according to the voltage increment detected by the voltage detection module and the increment of the static load applied by the loading device.
Furthermore, the detection device also comprises a mounting rack which is arranged on the fixing device and used for mounting the eddy current displacement sensor, and the eddy current displacement sensor is connected with the mounting rack in a sliding mode along the loading direction.
According to another aspect of the present invention, there is also provided a static stiffness test method for measuring static stiffness of an elastic support part, the method specifically comprising the steps of: mounting and fixing the mounting end of the elastic supporting part on the fixing device along the horizontal direction, mounting and fixing the mounting end of the loading device on the elastic supporting end of the elastic supporting part along the vertical direction so as to simulate the practical application environment of the elastic supporting part 1, and abutting the probe end of the eddy current displacement sensor on the mounting end of the loading device along the vertical direction; applying a static load to the elastic support end of the elastic support part along the vertical direction through the loading end of the loading device, so that the elastic support end of the elastic support part generates elastic deformation along the vertical direction, the mounting end of the loading device generates displacement along the vertical direction, and the displacement is synchronously transmitted to the eddy current displacement sensor, so that the voltage of the eddy current displacement sensor is increased, the increment of the voltage of the eddy current displacement sensor is detected through a voltmeter, and the displacement increment of the mounting end of the loading device is obtained according to the increment of the voltage of the eddy current displacement sensor detected by the voltmeter; and obtaining the static rigidity of the elastic supporting part according to the increment of the static load applied to the elastic supporting end of the elastic supporting part along the vertical direction and the displacement increment of the mounting end of the loading device.
Further, after the elastic supporting part is installed and before the displacement increment of the installation end of the loading device is obtained, the method further comprises the following steps: and preloading the elastic support end of the elastic support part along the vertical direction, and standing for 10-15min to eliminate the gap between the elastic support end of the elastic support part and the installation end of the loading device.
Further, the displacement increment of the mounting end of the loading device is obtained by adopting the following formula:
obtaining the static rigidity of the elastic supporting part by adopting the following formula:
Further, obtaining the static stiffness of the resilient support element comprises the steps of: and applying static load to the elastic support end of the elastic support part for multiple times in the same amount along the vertical direction, and recording the voltage increment of the eddy current displacement sensor detected by the voltage detection module each time, so that the displacement increment of the mounting end of the loading device under multiple static loads along the vertical direction is obtained, and the static rigidity of the elastic support part is obtained by fitting a regression equation.
The invention has the following beneficial effects:
the static stiffness tester of the invention fixes the mounting end of the elastic supporting part through the fixing device, and fixes the mounting end of the loading device at the elastic branch end of the elastic supporting part, thereby simulating the practical application environment of the elastic supporting part, and further loads static load through the loading end of the loading device, so that the mounting end of the loading device generates displacement along the loading direction, and the elastic branch end of the elastic supporting part generates elastic deformation along the loading direction, thereby truly simulating the practical stress state of the elastic supporting part in an engine, and by making the probe end of the eddy current displacement sensor abut against the mounting end of the loading device along the loading direction, the displacement generated by the mounting end of the loading device along the loading direction is synchronously transmitted to the probe end of the eddy current displacement sensor, thereby increasing the voltage of the eddy current displacement sensor, and measuring the increment of the voltage of the eddy current displacement sensor through the voltage detection module, therefore, the displacement increment of the mounting end of the loading device is obtained according to the voltage increment of the eddy current displacement sensor and the increment of the static load applied by the loading device, the static rigidity of the elastic supporting part is further obtained according to the displacement increment of the mounting end of the loading device and the static load loaded by the loading device, and the eddy current displacement sensor can more accurately and sensitively measure the elastic deformation of the elastic supporting end of the elastic supporting part along the loading direction, so that the static rigidity of the elastic supporting part can be more accurately measured, and the accuracy of the static rigidity test of the elastic supporting part is improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a stiffness tester according to a preferred embodiment of the present invention.
Illustration of the drawings:
1. an elastic support member; 2. a fixed platform; 3. a rigid mount; 4. pressing a ring; 5. a load ring; 6. a tray; 7. a nylon cord loop; 8. hooking; 9. an eddy current displacement sensor; 10. a mounting frame; 11. a pre-positioning device; 12. and a voltage detection module.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Fig. 1 is a schematic structural view of a stiffness tester according to a preferred embodiment of the present invention.
As shown in fig. 1, the static stiffness tester of the present embodiment is used for measuring static stiffness of the elastic supporting part 1, and the static stiffness tester includes a fixing device for simulating an actual application environment of the elastic supporting part 1 and fixing a mounting end of the elastic supporting part 1, a loading device for loading a static load on an elastic branch end of the elastic supporting part 1, and a detecting device for measuring static stiffness of the elastic supporting part 1 according to the static load applied by the loading device and elastic deformation generated in a loading direction by the elastic branch end of the elastic supporting part 1, the mounting end of the loading device is fixed to the elastic branch end of the elastic supporting part 1, the detecting device includes an eddy current displacement sensor 9 whose probe end abuts against the mounting end of the loading device in the loading direction, and a voltage detecting module 12 connected to the eddy current displacement sensor 9 and used for detecting a voltage change of the eddy current displacement sensor 9 during loading, the static load is loaded through the loading end of the loading device, so that the mounting end of the loading device generates displacement along the loading direction, the elastic branch end of the elastic supporting part 1 generates elastic deformation along the loading direction, the probe end of the eddy current displacement sensor 9 is driven by the mounting end of the loading device to synchronously move along the loading direction to increase the voltage, the increment of the voltage of the eddy current displacement sensor 9 is measured through the voltage detection module 12, the increment of the displacement of the mounting end of the loading device along the loading direction is obtained according to the increment of the voltage of the eddy current displacement sensor 9 and the increment of the load applied by the loading device, and the static rigidity of the elastic supporting part 1 is obtained according to the increment of the displacement of the mounting end of the loading device along the loading direction and the increment of the static load applied by the loading device.
As shown in FIG. 1, the static stiffness tester of the invention fixes the installation end of the elastic supporting part 1 by the fixing device, simulates the practical application environment of the elastic supporting part 1 by fixing the installation end of the loading device at the elastic supporting end of the elastic supporting part 1, further loads the static load by the loading end of the loading device, makes the installation end of the loading device generate displacement along the loading direction, and makes the elastic supporting end of the elastic supporting part 1 generate elastic deformation along the loading direction, thereby truly simulating the practical stress state of the elastic supporting part 1 in the engine, makes the probe end of the electric eddy current displacement sensor 9 contact with the installation end of the loading device along the loading direction, makes the displacement generated by the installation end of the loading device along the loading direction synchronously transfer to the probe end of the electric eddy current displacement sensor 9, thereby increasing the voltage of the electric eddy current displacement sensor 9, the voltage detection module 12 is used for measuring the voltage increment of the eddy current displacement sensor 9, so that the displacement increment of the mounting end of the loading device is obtained according to the voltage increment of the eddy current displacement sensor 9 and the increment of the static load applied by the loading device, the static rigidity of the elastic supporting part 1 is further obtained according to the displacement increment of the mounting end of the loading device and the static load loaded by the loading device, and the eddy current displacement sensor 9 can more accurately and sensitively measure the elastic deformation of the elastic supporting end of the elastic supporting part 1 along the loading direction, so that the static rigidity of the elastic supporting part 1 can be more accurately measured, and the accuracy of the static rigidity test of the elastic supporting part 1 is improved.
As shown in fig. 1, the fixing device includes a fixing table 2, a rigid mount 3 mounted on the fixing table 2, and a pressing ring 4 for press-fastening the mounting end of the elastic support member 1 to the rigid mount 3. The rigid mount 3 is provided with a fixing groove to be fitted with the mounting end of the elastic supporting member 1. The mounting end of the elastic support member 1 is press-fastened in the fixing groove by the pressing ring 4. The fixed platform 2 is provided with a T-shaped groove, and the rigid seat 3 is provided with a convex block matched with the T-shaped groove. The rigidity of the rigid seat 3 is much greater than that of the elastic supporting part 1.
As shown in fig. 1, the loading device includes a loading ring 5 for being fitted over the spring-supported end of the elastic support member 1 and a tray 6 suspended from the loading ring 5 for placing a weight to apply a load. Optionally, a hydraulic device is used to apply force to the loading end of the loading device. The tray 6 is hung on the loading ring 5 through a hook 8, and a nylon rope ring 7 for installing the hook 8 is arranged on the loading ring 5. The loading ring 5 is formed by splicing two half rings, the two half rings are clamped and fixed on the elastic supporting end of the elastic supporting part 1, a through hole for penetrating the nylon rope ring 7 is formed in the middle point of one half ring along the axial direction, and a contact plane for contacting with the probe end of the eddy current displacement sensor 9 is formed in the middle point of the other half ring. In this embodiment, two half rings are respectively located the top and the below of elastic support part 1, are fixed in the bullet end of elastic support part 1 through two half ring centre gripping, and nylon becket 7 is worn to be equipped with in the mid point department of the half ring that is located the below, and couple 8 hangs on nylon becket 7 to through placing the weight on tray 6, realize the loading along vertical direction to elastic support part 1, and prevent that the swing from influencing the accuracy of static rigidity test result. The hook 8 is fixed at a central position of the tray 6 so that the center of gravity of the tray 6 is located in the loading direction. The top end of the upper half ring is provided with a contact plane which is used for being in contact with the probe end of the eddy current displacement sensor 9. The loading direction of the loading device is the hanging direction of the tray 6, i.e. the vertical direction.
As shown in fig. 1, the static stiffness tester further includes an adjusting device for adjusting a position of a probe end of the eddy current displacement sensor, so as to ensure that the probe end of the eddy current displacement sensor abuts against a mounting end of the loading device in the loading direction. The adjusting device further comprises a supporting screw installed on the fixing device, a supporting screw upper pressing plate is erected on the supporting screw and a mounting frame installed on the pressing plate, the eddy current displacement sensor 9 is connected with the mounting frame in a sliding mode in the vertical direction, a kidney-shaped groove used for penetrating through the supporting screw is formed in the pressing plate in the horizontal direction, the pressing plate is adjusted in a moving mode in the horizontal direction, the sliding direction of the probe end of the eddy current displacement sensor 9 on the mounting frame is consistent with the hanging direction of the tray 6, and then the pressing plate is pressed and fixed through the cooperation of the fixing bolt and the supporting screw. Meanwhile, the rigid seat 3 is pressed and fixed on the fixed platform 2 through the pressing plate.
As shown in fig. 1, the detection device further includes a data analysis processing module connected to the voltage detection module 12 for obtaining the static stiffness of the elastic support part 1 after performing analysis processing according to the voltage variation value of the voltage detection module 12 and the increment of the static load applied by the loading device. The data analysis processing module is used for collecting and recording the voltage change value of the voltage detection module 12 and the load applied by the loading device, and processing and analyzing the data, so that the rigidity value of the elastic supporting part 1 can be quickly obtained. The detection device further comprises a pre-positioning device 11 for amplifying the voltage signal of the eddy current displacement sensor 9 and transmitting the amplified voltage signal to a voltage detection module 12. The detection device further comprises a mounting frame 10 which is arranged on the fixing device and used for mounting the eddy current displacement sensor 9, and the eddy current displacement sensor 9 is connected with the mounting frame 10 in a sliding mode along the loading direction.
The static stiffness test method of the embodiment is used for measuring the static stiffness of the elastic supporting part 1, and specifically comprises the following steps: mounting and fixing the mounting end of the elastic supporting part 1 on a fixing device along the horizontal direction, mounting and fixing the mounting end of a loading device on the elastic supporting end of the elastic supporting part 1 along the vertical direction so as to simulate the practical application environment of the elastic supporting part 1, and abutting the probe end of the eddy current displacement sensor 9 on the mounting end of the loading device along the vertical direction; applying a static load to the elastic branch end of the elastic supporting part 1 along the vertical direction through the loading end of the loading device, so that the elastic branch end of the elastic supporting part 1 generates elastic deformation along the vertical direction, the mounting end of the loading device generates displacement along the vertical direction, and the displacement is synchronously transmitted to the eddy current displacement sensor 9, so that the voltage of the eddy current displacement sensor 9 is increased, the increment of the voltage of the eddy current displacement sensor 9 is detected through a voltmeter, and the displacement increment of the mounting end of the loading device is obtained according to the increment of the voltage of the eddy current displacement sensor 9 detected by the voltmeter; the static stiffness of the elastic supporting part 1 is obtained from the increment of the static load applied to the spring support end of the elastic supporting part 1 in the vertical direction and the displacement increment of the mounting end of the loading device. When the voltage detection module 12 detects the voltage of the eddy current displacement sensor 9 and the initial voltage is subtracted from the stabilized voltage to obtain a voltage increment, the corresponding loaded static load is the increment of the static load.
After the elastic supporting part 1 is installed and before the displacement increment of the installation end of the loading device is obtained, the method further comprises the following steps: and preloading the elastic support end of the elastic support part 1 in the vertical direction, and standing for 10-15min to eliminate the gap between the elastic support end of the elastic support part 1 and the installation end of the loading device. In this embodiment, a plurality of weights are placed on the tray 6 and left standing for 10min to 15min, so that the clamping gap between the loading ring 5 and the spring support end of the elastic support part 1 is eliminated, and then the redundant weights are removed, leaving one weight, so that the probe end of the eddy current displacement sensor 9 is perpendicular to the contact plane of the top end of the loading ring 5.
Obtaining the displacement increment of the mounting end of the loading device by adopting the following formula:
the stiffness value of the elastic supporting part 1 is obtained by using the following formula:
Obtaining the static stiffness of the elastic supporting part 1, comprising the steps of: and (3) equally and repeatedly applying loads to the elastic support end of the elastic support part 1 along the vertical direction, and recording the voltage increment of the eddy current displacement sensor 9 detected by the voltage detection module 12 every time, so that the displacement increment of the installation end of the loading device along the vertical direction under various static loads is obtained, and the static rigidity of the elastic support part 1 is obtained by adopting regression equation fitting. The above operations are repeated to obtain a plurality of test values of the static rigidity of the elastic supporting part 1, and the average value of the plurality of test values is taken as the final result of the rigidity. In this embodiment, the weight is increased from 5Kg to 30Kg, each time with the 5Kg weight.
As can be understood from the above equation for obtaining the elastic deformation amount of the spring support end of the elastic support part 1 in the vertical direction and obtaining the stiffness value of the elastic support part 1, there is a linear relationship between the increment of the detected voltage of the voltage detection module 12 and the increment of the load applied to the spring support end of the elastic support part 1, that is, the slope is the static stiffness value of the elastic support part 1. Therefore, in order to reduce the measurement error, the test result adopts a method of regression equation fitting solution and multiple repeated measurement averaging, firstly, weights are loaded on the elastic supporting part 1 for multiple times by equal mass, voltage values and static loads of each time are respectively recorded, so that a group of test data is obtained, then, repeated operation is carried out to obtain multiple groups of test data, a linear regression equation is used for solving the test value of the rigidity of each group of data for each group of data, then, the average value of the test values of the rigidity of the multiple groups of data is taken as the actual rigidity value of the elastic supporting part 1, and the calculation formula of the rigidity value of each group of data is as follows:
wherein mg is the gravity of the weight loaded each time, n is the number of tests, U is the voltage value detected by the voltage detection module 12, and Ks is the test value of the stiffness of a set of data.
In this embodiment, a static stiffness test is performed on the elastic support part 1 by using a stiffness tester, which specifically includes the following steps: after the test is determined, the equipment states of the rigidity tester, the weight and the eddy current displacement sensor 9 are checked, the limit value of the loading static load of the part to be tested is checked in advance (the loading load of the elastic supporting part 1 is smaller than the quality of an assembled rotor), and the part to be tested is prevented from being permanently damaged in the loading process; the mounting end of the elastic supporting part 1 is fixed on the rigid seat 3 through the compression ring 4, the loading ring 5 is fixed at the elastic supporting end of the elastic supporting part 1, the top end plane of the loading ring 5 is kept at a horizontal position, and the tray 6 is hung on a nylon rope ring 7 at the bottom end of the loading ring 5 through a hook 8; electrifying the voltage detection module 12 and the eddy current displacement sensor 9, and adjusting the detection precision of the voltage detection module 12 to be 0.0001V; loading weights on the tray 6, standing for 10-15min to eliminate a clamping gap between the elastic supporting end of the elastic supporting part 1 and the loading ring 5, leaving a weight after the gap is eliminated, removing redundant weights, adjusting the probe end of the eddy current displacement sensor 9 to be perpendicular to the upper plane of the loading ring 5 and centered, and controlling the moving distance of the probe end of the eddy current displacement sensor 9 to stabilize the voltage of the eddy current displacement sensor 9 detected by the voltage detection module 12 at 5-7V; recording the voltage of the eddy current displacement sensor 9 detected by the voltage detection module 12 during the first loading as an initial voltage; the weight is loaded for a plurality of times in an equal mass mode, the voltage of the eddy current displacement sensor 9 detected by the voltage detection module 12 is recorded after the weight is loaded for each time, and the voltage is recorded as a first group of test data; repeating the test process of recording the initial voltage and loading the weight with equal mass for multiple times, and recording three groups of test data; and respectively carrying out regression equation fitting on the three groups of test data through a data analysis processing module to obtain three rigidity test values, and taking the average value of the single rigidity test value as the final test result of the static rigidity. In this embodiment, the static stiffness test method is used to perform a stiffness test on a plurality of elastic supporting parts 1, after the test is finished, each elastic supporting part 1 obtains three sets of data of the stiffness test, the three sets of repeated test data are compared, if the repeated error (the repeated error is the difference between the maximum value and the minimum value in the three tests divided by the average value) is greater than 9%, the three sets of data need to be obviously different from the other two sets, and then one set of repeated test is added until the repeated error is less than 9%. If the data with good repeatability can not be obtained for more than 3 times through the increase test, whether the design of the elastic support structure is reasonable or whether the processing meets the requirements needs to be analyzed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A static stiffness tester is used for measuring the static stiffness of an elastic supporting part (1) and is characterized in that,
the static stiffness tester comprises a fixing device for simulating the practical application environment of the elastic supporting part (1) and fixing the mounting end of the elastic supporting part (1), a loading device for loading static load on the elastic branch end of the elastic supporting part (1), and a detection device for measuring the static stiffness of the elastic supporting part (1) according to the static load applied by the loading device and the elastic deformation generated by the elastic branch end of the elastic supporting part (1) along the loading direction,
the mounting end of the loading device is fixed at the elastic supporting end of the elastic supporting part (1),
the detection device comprises an eddy current displacement sensor (9) with a probe end abutting against the mounting end of the loading device along the loading direction, and a voltage detection module (12) connected with the eddy current displacement sensor (9) and used for detecting the voltage change of the eddy current displacement sensor (9) during loading,
the static load is loaded through the loading end of the loading device, so that the mounting end of the loading device generates displacement along the loading direction, the elastic support end of the elastic support part (1) generates elastic deformation along the loading direction, the probe end of the eddy current displacement sensor (9) is driven by the mounting end of the loading device to synchronously move along the loading direction to increase the voltage, the increment of the voltage of the eddy current displacement sensor (9) is measured through the voltage detection module (12), the increment of the displacement of the mounting end of the loading device along the loading direction is obtained according to the increment of the voltage of the eddy current displacement sensor (9) and the increment of the load applied by the loading device, and the static rigidity of the elastic support part (1) is obtained according to the increment of the displacement of the mounting end of the loading device along the loading direction and the increment of the static load applied by the loading device.
2. The static stiffness tester according to claim 1,
the fixing device comprises a fixing platform (2), a rigid seat (3) arranged on the fixing platform (2) and a pressing ring (4) used for pressing and fixing the mounting end of the elastic supporting part (1) on the rigid seat (3).
3. The static stiffness tester according to claim 1,
the loading device comprises a loading ring (5) sleeved on the elastic supporting end of the elastic supporting part (1) and a tray (6) hung on the loading ring (5) and used for placing weights to apply load.
4. The static stiffness tester according to claim 3,
the tray (6) is hung on the loading ring (5) through a hook (8), and a nylon rope ring (7) for installing the hook (8) is arranged on the loading ring (5).
5. The static stiffness tester according to claim 1,
the detection device also comprises a data analysis processing module which is connected with the voltage detection module (12) and is used for obtaining the static rigidity of the elastic supporting part (1) after analysis processing is carried out according to the voltage increment detected by the voltage detection module (12) and the increment of the static load applied by the loading device.
6. The static stiffness tester according to claim 1,
the detection device further comprises a mounting frame (10) which is arranged on the fixing device and used for mounting the eddy current displacement sensor (9), and the eddy current displacement sensor (9) is connected with the mounting frame (10) in a sliding mode along the loading direction.
7. A static stiffness test method is used for measuring the static stiffness of an elastic supporting part (1), and is characterized by comprising the following steps:
mounting and fixing the mounting end of the elastic supporting part (1) on a fixing device along the horizontal direction, mounting and fixing the mounting end of a loading device on the elastic supporting end of the elastic supporting part (1) along the vertical direction so as to simulate the practical application environment of the elastic supporting part 1, and enabling the probe end of the eddy current displacement sensor (9) to be abutted against the mounting end of the loading device along the vertical direction;
applying a static load to the elastic support end of the elastic support part (1) along the vertical direction through the loading end of the loading device, enabling the elastic support end of the elastic support part (1) to generate elastic deformation along the vertical direction, enabling the installation end of the loading device to generate displacement along the vertical direction, and synchronously transmitting the displacement to the eddy current displacement sensor (9), so that the voltage of the eddy current displacement sensor (9) is increased, detecting the increment of the voltage of the eddy current displacement sensor (9) through a voltmeter, and obtaining the displacement increment of the installation end of the loading device according to the increment of the voltage of the eddy current displacement sensor (9) detected by the voltmeter;
and obtaining the static rigidity of the elastic supporting part (1) according to the increment of the static load applied to the elastic supporting end of the elastic supporting part (1) along the vertical direction and the displacement increment of the mounting end of the loading device.
8. The static stiffness test method according to claim 7, wherein after the elastic support part is installed and before the displacement increment of the installation end of the loading device is obtained, the method further comprises the following steps:
and preloading the elastic support end of the elastic support part (1) along the vertical direction, and standing for 10-15min to eliminate the gap between the elastic support end of the elastic support part (1) and the installation end of the loading device.
9. The static stiffness test method according to claim 7,
obtaining the displacement increment of the mounting end of the loading device by adopting the following formula:
obtaining the static stiffness of the elastic supporting part (1) by adopting the following formula:
10. The static stiffness test method according to claim 9, wherein obtaining the static stiffness of the elastic support part (1) comprises the steps of:
the static load is applied to the elastic support end of the elastic support part (1) in the vertical direction for multiple times in an equal amount, and the increment of the voltage of the eddy current displacement sensor (9) detected by the voltage detection module (12) every time is recorded, so that the displacement increment of the installation end of the loading device under multiple static loads in the vertical direction is obtained, and the static rigidity of the elastic support part (1) is obtained by fitting a regression equation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113176150A (en) * | 2021-05-17 | 2021-07-27 | 哈尔滨汽轮机厂有限责任公司 | Squirrel cage deformation test device and method |
| CN113804428A (en) * | 2021-10-20 | 2021-12-17 | 江南造船(集团)有限责任公司 | Multi-connected creep and static stiffness testing machine |
| CN114136618A (en) * | 2021-11-30 | 2022-03-04 | 中国航发哈尔滨轴承有限公司 | Outer ring special-shaped structure bearing rigidity measurement tool and method |
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| CN103245474A (en) * | 2013-05-21 | 2013-08-14 | 中国航空动力机械研究所 | Measuring device and method for rigidity of elastic supporting device |
| CN109556811A (en) * | 2018-12-03 | 2019-04-02 | 南京航空航天大学 | A kind of big rigidity mouse cage Static stiffness test device and test method |
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| CN103245474A (en) * | 2013-05-21 | 2013-08-14 | 中国航空动力机械研究所 | Measuring device and method for rigidity of elastic supporting device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113176150A (en) * | 2021-05-17 | 2021-07-27 | 哈尔滨汽轮机厂有限责任公司 | Squirrel cage deformation test device and method |
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