Excitation loading device considering thermal vibration coupling environment

Abstract

The invention discloses an excitation loading device considering a thermal vibration coupling environment, and relates to the technical field of vibration tests. The device comprises a force sensor, one side of the force sensor is detachably provided with a test piece loading assembly, the other side of the force sensor is detachably provided with an axial force transmission assembly, and the force sensor is used for realizing the detection of the transmission load of the vibration exciter. According to the invention, step-by-step connection of the test piece and the vibration exciter can be realized, the connection of the test piece can be independently completed without considering the connection and position of the other end of the connecting rod when the test piece is connected, and the two sides of the test piece are fixed through metal deformation, so that the connection is firmer, and the connecting rod is independently mounted on the vibration exciter. The screw rod and the connecting rod of the vibration exciter are connected through the axial force transmission module, the problem that a single rod is difficult to install is solved through step-by-step connection, the connecting efficiency and the connecting effect can be better improved, destructiveness of a thermal vibration coupling test to test equipment can be reduced, and all parts are simple in structure, easy to machine and replace and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of vibration testing, in particular to an excitation loading device in a thermal-vibration coupling environment. Background Art

[0002] High-speed aircraft will face severe thermal-vibration coupling conditions when in service, which will cause deformation and damage to the structure, thus affecting the performance and safety of the aircraft. In order to shorten the test cycle and save test costs, ground tests are usually used to study thermal-vibration coupling conditions. In order to apply random dynamic loads to different points, the use of an exciter is a more appropriate load loading method. However, in the thermal-vibration coupling test where the exciter applies loads, the connection between the exciter and the test piece brings great difficulties.

[0003] At present, the common exciter load connection system is a simple connection through a through hole and a nut. However, in the case where both sides of the test piece can be operated, the through hole and nut connection may result in a loose connection, loose connection during the vibration test, and failure of axial force transmission. In the case where both sides can be operated, if a threaded hole is used for connection, the distance between the exciter and the test piece will change during the connection process due to the relative movement of the connecting rod connection, resulting in assembly difficulties and damage to the test equipment. In the case where the interior of the test piece is a closed space, if a through hole and a nut connection is used, there will be assembly difficulties and loose connections. For this reason, the present invention proposes an excitation loading device that takes into account the thermal vibration coupling environment. Summary of the invention

[0004] The purpose of the present invention is to provide an excitation loading device taking into account the thermal vibration coupling environment, which can solve the problems of difficult adjustment of the ejector distance, great assembly difficulty, and loose assembly when the exciter is loading and exciting during the thermal vibration coupling test.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: Considering the excitation loading device in the thermal vibration coupling environment, it includes a force sensor, one side of the force sensor is detachably mounted with a test piece loading component, and the other side is detachably mounted with an axial force transmission component, which is used to detect the load transmitted by the exciter;

[0006] The test piece loading assembly includes a screw threadedly connected to one side of the force sensor, the outer surface of the screw is sleeved with a test piece, a hollow gecko expansion screw is installed between the test piece and the screw, and the test piece and the screw are installed and fixed by the hollow gecko expansion screw;

[0007] The axial force transmission assembly includes a first axial coupling threadedly connected to the force sensor, a second axial coupling is detachably mounted on an end of the first axial coupling, and a connecting rod is fixedly connected to an end of the second axial coupling.

[0008] Furthermore, a threaded hole is provided inside the hollow gecko expansion screw, and the threaded hole is threadedly connected to the screw rod.

[0009] Furthermore, a positioning nut is threadedly connected to the outer surface of the screw rod, and the positioning nut is located on a side of the test piece away from the hollow gecko expansion screw.

[0010] Furthermore, the first axial coupling and the second axial coupling are interlocked with each other, and the first axial coupling and the second axial coupling are detachably connected via bolts.

[0011] Furthermore, screw holes matched with bolts are provided on the side walls of the first axial coupling and the second axial coupling, and the screw holes on the first axial coupling and the second axial coupling are aligned with each other.

[0012] Furthermore, the connecting rod is coaxially arranged with the second axial coupling.

[0013] Furthermore, a fastening bolt is threadedly connected to the outer surface of the connecting rod, and the fastening bolt abuts against one side of the second axial coupling.

[0014] Furthermore, the free end of the connecting rod is connected to a vibration exciter.

[0015] Furthermore, a screw hole meshing with the screw is provided on one side of the force sensor facing the screw.

[0016] Furthermore, a stud is fixedly connected to a side of the force sensor facing the first axial coupling, and a screw hole matched with the stud is opened on the side wall of the first axial coupling.

[0017] The present invention has at least the following beneficial effects:

[0018] (1) The present invention can realize the step-by-step connection between the test piece and the exciter. When connecting the test piece, the test piece connection module can ignore the connection and position of the other end of the connecting rod and complete the connection at the test piece alone. The two sides of the test piece are fixed by metal deformation, making the connection tighter. The connecting rod is independently installed on the exciter. The screw rod and the connecting rod of the exciter are connected by an axial force transmission module. The problem of difficulty in single-rod installation is solved by step-by-step connection. Compared with the traditional exciter connection method, it can better improve the connection efficiency and achieve better connection effect.

[0019] (2) The present invention can realize adaptive adjustment according to the distance between the test piece and the vibrator. The traditional connecting rod is difficult to adapt to the change of the distance between the test piece and the connecting rod due to the fixed distance. The present invention can control the distance change by controlling the length of the screw screwed into the hollow gecko expansion screw, which has lower cost and simpler operation.

[0020] (3) The present invention realizes the process of fixing both ends of the test piece through a single-sided operation, thereby solving the problem of lack of installation space for some test pieces.

[0021] (4) The load applied in the present invention can be fed back through a force sensor to complete the detection and collection of the applied load during the test, which is convenient for subsequent data processing.

[0022] (5) The present invention realizes stable transmission of axial force through the axial force connection module, thereby ensuring the accuracy of load loading.

[0023] (6) The present invention reduces the destructiveness of the thermal vibration coupling test to the test equipment. The structure of each component is simple, easy to process and replace, and the cost is low. The damaged parts under high temperature and vibration can be directly replaced.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a side view schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a side view schematic diagram of the test piece connection module of the present invention;

[0027] Figure 3 is a side view schematic diagram of the axial force transmission module of the present invention;

[0028] Figure 4 It is a three-dimensional schematic diagram of the force sensor structure of the present invention.

[0029] Reference numerals:

[0030] 1. Test piece connection assembly; 2. Axial force transmission assembly; 3. Test piece; 4. Force sensor; 101. Hollow gecko expansion screw; 102. Positioning nut; 103. Screw; 201. First axial coupling; 202. Bolt; 203. Second axial coupling; 204. Fastening nut; 205. Connecting rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] See also Figure 1-Figure 4The present invention provides a technical solution: considering the excitation loading device under the thermal vibration coupling environment, including a force sensor 4, a test piece loading component 1 is detachably installed on one side of the force sensor 4, and an axial force transmission component 2 is detachably installed on the other side, which is used to realize the detection of the load transmitted by the exciter (not shown in the figure);

[0033] The test piece loading assembly 1 includes a screw 103 threadedly connected to one side of the force sensor 4, the outer surface of the screw 103 is sleeved with the test piece 3, a hollow gecko expansion screw 101 is installed between the test piece 3 and the screw 103, and the installation and fixation between the test piece 3 and the screw 103 is achieved by the hollow gecko expansion screw 101;

[0034] The axial force transmission assembly 2 includes a first axial coupling 201 threadedly connected to the force sensor 4 , a second axial coupling 203 is detachably mounted on the end of the first axial coupling 201 , and a connecting rod 205 is fixedly connected to the end of the second axial coupling 203 .

[0035] According to the technical solution of this embodiment, a threaded hole is provided inside the hollow gecko expansion screw 101, and the threaded hole is threadedly connected to the screw 103, and a positioning nut 102 is threadedly connected to the outer surface of the screw 103, and the positioning nut 102 is located on the side of the test piece 3 away from the hollow gecko expansion screw 101;

[0036] The hollow gecko expansion screw 101 is installed in the through hole of the test piece 3. The expansion screw is pulled to a deformed state using a pulling gun, and the deformation of the metal is used to fix the two sides of the test piece 3. The screw 103 is installed with a size corresponding to the hollow gecko expansion screw 101, and the positioning nut 102 determines the final position of the test piece 3, so that the position adjustment between the test piece 3 and the exciter can be achieved. The traditional connecting rod 205 is difficult to adapt to the distance change between the test piece 3 and the connecting rod 205 due to the fixed distance. Compared with the traditional method, this embodiment can control the distance change by controlling the length of the screw 103 screwed into the hollow gecko expansion screw 101, which has lower cost and simpler operation.

[0037] In addition, this embodiment can realize the step-by-step connection between the test piece 3 and the exciter. The test piece 3 connection module can ignore the connection and position of the other end of the connecting rod 205 when connecting the test piece 3, and complete the connection at the test piece 3 alone, and fix the two sides of the test piece 3 through metal deformation, so that the connection is tighter; the connecting rod 205 is independently installed on the exciter, and the screw 103 and the connecting rod 205 of the exciter are connected through the axial force transmission module. The problem of single-rod installation difficulty is solved through step-by-step connection. Compared with the traditional exciter connection method, it can better improve the connection efficiency and achieve better connection effect.

[0038] According to the technical solution of this embodiment, the first axial coupling 201 and the second axial coupling 203 are interlocked with each other, and the first axial coupling 201 and the second axial coupling 203 are detachably connected by bolts 202. Screw holes matching the bolts 202 are provided on the side walls of the first axial coupling 201 and the second axial coupling 203, and the screw holes on the first axial coupling 201 and the second axial coupling 203 are aligned with each other, which facilitates the installation and disassembly of the first axial coupling 201 and the second axial coupling 203.

[0039] According to the technical solution of this embodiment, the connecting rod 205 is coaxially arranged with the second axial coupling 203, and the free end of the connecting rod 205 is connected to the exciter, which can stably transmit the axial force and ensure the accuracy of load loading. The load applied by the exciter can be fed back through the force sensor 4 to complete the detection and collection of the applied load during the test, which is convenient for subsequent data processing.

[0040] According to the technical solution of this embodiment, the outer surface of the connecting rod 205 is threadedly connected with a fastening bolt 202, and the fastening bolt 202 abuts against one side of the second axial coupling 203. The fastening bolt 202 can enhance the connection strength between the connecting rod 205 and the second axial coupling 203.

[0041] According to the technical solution of this embodiment, a screw hole meshing with the screw 103 is provided on the side of the force sensor 4 facing the screw 103 , and the screw 103 and the force sensor 4 can be installed by screwing the screw 103 into the screw hole.

[0042] Furthermore, a stud is fixedly connected to the side of the force sensor 4 facing the first axial coupling 201, and a screw hole matching the stud is opened on the side wall of the first axial coupling 201. The screw hole on the first axial coupling 201 is installed on the stud, so that the force sensor 4 and the first axial coupling 201 can be installed. Each part used for the test has a simple structure, is easy to process and replace, and has low cost, and the damaged parts under high temperature and vibration can be directly replaced.

[0043] The use principle and process of the present invention are as follows: during installation, a hollow gecko expansion screw 101 is installed in the through hole on the test piece 3. The hollow gecko expansion screw 101 can be tightened on both sides by metal deformation. The screw 103 is threadedly connected in the hollow gecko expansion screw 101 to fix the position between the screw 103 and the test piece 3. Then, the positioning nut 102 is installed on the screw 103, and the other end of the screw 103 is threadedly connected to the force sensor 4. The force sensor 4 is threadedly connected to the first axial coupling 201, the connecting rod 205 is connected to the second axial coupling 203, and the connecting rod 205 is threadedly connected to the fastening nut 204 to enhance the connection strength between the connecting rod 205 and the second axial coupling 203, and the connecting rod 205 is threadedly connected to the fastening nut 204 to enhance the connection strength between the connecting rod 205 and the second axial coupling 203. The other end of the rod 205 is fixedly connected to the vibrator, and then the distance of the screw 103 is adjusted according to the actual distance, and then the first axial coupling 201 and the second axial coupling 203 are connected by the bolt 202, and then the positioning nut 102 and the fastening nut 204 are tightened according to the position; when disassembling, first loosen the positioning nut 102, the fastening nut 204 and the bolt 202 to separate the first axial coupling 201 and the second axial coupling 203, and disassemble the first axial coupling 201, the force sensor 4, the positioning nut 102, the screw 103 and the hollow gecko expansion screw 101 in turn at one end of the test piece 3, and disassemble the first axial coupling 201, the fastening nut 204 and the connecting rod 205 in turn on the side of the vibrator.

[0044] The vibration loading device proposed in the present invention taking into account the thermal vibration coupling environment can not only complete the fastening of both sides of the test piece 3 through a single-sided operation, but also complete the connection between the test piece 3 and the exciter through a step-by-step operation, and has the characteristics of a wide range of applications, a simple structure, and easy disassembly and transportation.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. Considering the excitation loading device in a thermal vibration coupling environment, including a force sensor (4), characterized in that: The force sensor (4) has a test piece loading assembly (1) detachably mounted on one side thereof and an axial force transmission assembly (2) detachably mounted on the other side thereof, for realizing detection of load transmitted by the vibration exciter; The test piece loading assembly (1) comprises a screw rod (103) threadedly connected to one side of the force sensor (4); the test piece (3) is sleeved on the outer surface of the screw rod (103); a hollow gecko expansion screw (101) is installed between the test piece (3) and the screw rod (103); and the test piece (3) and the screw rod (103) are installed and fixed by the hollow gecko expansion screw (101); The axial force transmission assembly (2) comprises a first axial coupling (201) threadedly connected to the force sensor (4), a second axial coupling (203) being detachably mounted on the end of the first axial coupling (201), and a connecting rod (205) being fixedly connected to the end of the second axial coupling (203).

2. The excitation loading device in a thermal-vibration coupling environment according to claim 1 is characterized in that: A threaded hole is provided inside the hollow gecko expansion screw (101), and the threaded hole is threadedly connected to the screw rod (103).

3. The excitation loading device in a thermal-vibration coupling environment according to claim 2 is characterized in that: The outer surface of the screw rod (103) is threadedly connected with a positioning nut (102), and the positioning nut (102) is located on a side of the test piece (3) away from the hollow gecko expansion screw (101).

4. The excitation loading device in a thermal-vibration coupling environment according to claim 2 is characterized in that: The first axial coupling (201) and the second axial coupling (203) are interlocked, and the first axial coupling (201) and the second axial coupling (203) are detachably connected via bolts (202).

5. The excitation loading device in a thermal-vibration coupling environment according to claim 4 is characterized in that: Screw holes matching the bolts (202) are provided on the side walls of the first axial coupling (201) and the second axial coupling (203), and the screw holes on the first axial coupling (201) and the second axial coupling (203) are aligned with each other.

6. The excitation loading device in a thermal-vibration coupling environment according to claim 5 is characterized in that: The connecting rod (205) and the second axial coupling (203) are coaxially arranged.

7. The excitation loading device in a thermal-vibration coupling environment according to claim 6 is characterized in that: The outer surface of the connecting rod (205) is threadedly connected with a fastening bolt (202), and the fastening bolt (202) abuts against one side of the second axial coupling (203).

8. The excitation loading device in a thermal-vibration coupling environment according to claim 9 is characterized in that: The free end of the connecting rod (205) is connected to the vibration exciter.

9. The excitation loading device in a thermal-vibration coupling environment according to claim 8, characterized in that: The force sensor (4) is provided with a screw hole meshing with the screw (103) on one side facing the screw (103).

10. The excitation loading device in a thermal-vibration coupling environment according to claim 9, characterized in that: A stud is fixedly connected to the side of the force sensor (4) facing the first axial coupling (201), and a screw hole matching the stud is provided on the side wall of the first axial coupling (201).

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