Vibration rod and its manufacturing method, high-temperature modal simulation test device and method

Abstract

The present invention discloses a vibration rod and a method for making the same, and relates to the technical field of high-temperature modal parameter measuring devices. The vibration rod includes a connecting member, a cooling member, and a supporting member that are fixedly connected in sequence. The end of the connecting member away from the cooling member is used for fixed connection with a test member, and the end of the supporting member away from the cooling member is used for fixed connection with an exciter. A cooling cavity is formed inside the cooling member, and a liquid inlet and a liquid outlet that are connected to the cooling cavity are provided on the cooling member. The cooling cavity is used for passing a flowing liquid cooling medium. The present invention also discloses a high-temperature modal simulation test device and a high-temperature modal simulation test method including the vibration rod; the vibration rod and its manufacturing method, the high-temperature modal simulation test device and method can realize the normal application of a vibration rod excitation signal at 750°C to 1200°C in a high-temperature environment.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature modal parameter measuring devices, and in particular to a vibration rod and a manufacturing method thereof, and a high-temperature modal simulation test device and method. Background Art

[0002] The exciter is a common device used to stimulate the test object to produce forced vibration in modal tests. The exciter converts the amplified electrical signal into mechanical energy and acts on the test piece through the excitation rod and force sensor. The exciter, the excitation rod and the force sensor axis must be in the same straight line. As the flight speed of hypersonic aircraft becomes higher and higher, higher temperature requirements are put forward for ground high-temperature modal simulation tests. When the hypersonic aircraft flies at a speed of more than 8Ma, the temperature of the wing front rafters, rudder wings and other structures will reach 1200℃; in thermal modal tests, the application of the excitation signal is mainly applied to the test piece through the exciter connected to the excitation rod. Therefore, the excitation rod needs to be in direct fixed contact with the test piece, thus exposing it to an ultra-high temperature environment. Existing thermal modal test excitation rods cannot work for a long time at such high temperatures. In the existing test methods, the maximum temperature that ordinary aluminum excitation rods can withstand is 300°C, and high-temperature resistant nickel-based alloy excitation rods can work below 750°C. When the temperature exceeds 750°C and reaches 1200°C, the strength of the high-temperature resistant nickel-based alloy decreases and the plasticity increases, resulting in a large change in the mechanical properties of the excitation rod, which cannot accurately transmit the applied excitation signal. The high temperature of the quartz lamp radiation heating will also be transmitted to the exciter through the excitation rod, causing damage to the dynamic coil of the exciter, affecting the smooth progress of the high-temperature modal test. Therefore, it is urgent to design a excitation rod that can effectively transmit force under the action of a high temperature of 1200°C to ensure the smooth progress of the ultra-high temperature modal test. Summary of the invention

[0003] The object of the present invention is to provide a vibration rod and its manufacturing method, a high-temperature modal simulation test device and method, so as to solve the problems existing in the above-mentioned prior art and realize the normal application of the vibration rod excitation signal in a high temperature environment (750℃~1200℃).

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an exciting rod, comprising a connecting member, a cooling member and a supporting member fixedly connected in sequence, wherein one end of the connecting member away from the cooling member is used for fixed connection with a test member, and one end of the supporting member away from the cooling member is used for fixed connection with an exciting device, a cooling cavity is formed inside the cooling member, and a liquid inlet and a liquid outlet connected to the cooling cavity are provided on the cooling member, and the cooling cavity is used for passing a flowing liquid cooling medium.

[0006] Preferably, the connecting member comprises a connecting rod and a sleeve, wherein one end of the connecting rod close to the cooling member is a first end, and the other end of the connecting rod is a second end, the sleeve is sleeved outside the first end, and the sleeve and the first end are both fixedly connected to the cooling member, and the second end extends out of the sleeve for fixed connection with the test piece;

[0007] Preferably, the second end is provided with an external thread section, and the external thread section is used to pass through the test piece and form a fixed connection with the test piece through a nut.

[0008] Preferably, the support member includes a support tube and a bottom plate, one end of the support tube is fixedly connected to the cooling member, the other end of the support tube is fixedly connected to the bottom plate, and the bottom plate is used to be fixedly connected to the exciter.

[0009] Preferably, a plurality of reinforcing ribs are provided for circumferential fixation at one end of the support tube for connection with the base plate, and the reinforcing ribs are all fixedly connected to the base plate.

[0010] Preferably, the connecting rod is a nickel-based stainless steel rod resistant to ultra-high temperature;

[0011] Preferably, the cooling member and the supporting member are both made of 304 stainless steel.

[0012] Preferably, the sleeve includes a cylinder and an end cover, the cylinder is sleeved outside the connecting rod, one end of the cylinder is connected to the cooling element, the other end of the cylinder is fixedly connected to the end cover, and the connecting rod passes through the end cover and is fixedly connected to the end cover.

[0013] Preferably, the connecting member and the supporting member are coaxially arranged.

[0014] The present invention also provides a high temperature modal simulation test device, comprising the exciting rod as described in any one of the above items.

[0015] The present invention also provides a high-temperature modal simulation test method, including installing an exciting rod as described in any of the above items, wherein one end of the connecting member away from the cooling member is fixedly connected to the test member, one end of the supporting member away from the cooling member is fixedly connected to the exciting device, and also includes introducing a flowing liquid cooling medium into the cooling cavity.

[0016] The present invention also provides a method for manufacturing an exciting rod, including manufacturing a connecting member and a supporting member, and also includes the steps of forming a cooling member with a cooling cavity inside and connecting the two ends of the cooling member to the connecting member and the supporting member respectively, and the cooling member is provided with a liquid inlet and a liquid outlet connected to the cooling cavity.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The excitation rod and its manufacturing method, and the high-temperature modal simulation test device and method provided in the present embodiment can effectively isolate the heat from being transferred from the connecting member to the supporting member by arranging a cooling member between the connecting member and the supporting member and passing a flowing liquid cooling medium into the cooling member, while also being able to cool the connecting member and the supporting member, so that the excitation rod can work normally in a high-temperature environment of 750°C to 1200°C, avoiding damage to the exciter dynamic coil caused by high temperature transmitted through the excitation rod, and realizing the normal application of the excitation rod excitation signal of 750°C to 1200°C in a high-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the axial side of the exciting rod provided by the present invention;

[0021] Figure 2 A front view of the exciting rod provided by the present invention;

[0022] Figure 3 for Figure 2 Left side view of the vibration rod in;

[0023] Figure 4 A main cross-sectional view of the exciting rod provided by the present invention;

[0024] Figure 5 A schematic structural diagram of a cooling member of the excitation rod provided by the present invention;

[0025] Figure 6 A schematic diagram of the structure of a high temperature modal simulation test device provided by the present invention;

[0026] In the figure: 10-excitation rod; 1-connecting piece; 11-connecting rod; 111-external threaded section; 12-sleeve; 121-cylinder; 122-end cover; 2-cooling piece; 21-cooling chamber; 22-liquid inlet pipe; 23-liquid outlet pipe; 24-first annular flange; 25-second annular flange; 26-through hole; 3-supporting piece; 31-supporting cylinder; 32-bottom plate; 33-reinforcement rib; 20-exciter; 30-test piece; 40-quartz lamp; 50-insulating asbestos felt; 60-ceramic rod; 70-metal rod; 80-acceleration sensor; 90-fixed column. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The object of the present invention is to provide a vibration rod and its manufacturing method, a high-temperature modal simulation test device and method, so as to solve the problems existing in the above-mentioned prior art and realize the normal application of the vibration rod excitation signal in a high temperature environment (750℃~1200℃).

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] This embodiment provides a vibration rod 10, such as Figure 1-6 As shown, it includes a connecting member 1, a cooling member 2 and a supporting member 3 which are fixedly connected in sequence. The end of the connecting member 1 away from the cooling member 2 is used for fixed connection with the test member 30, and the end of the supporting member 3 away from the cooling member 2 is used for fixed connection with the exciter 20. A cooling cavity 21 is formed inside the cooling member 2. The cooling member 2 is provided with a liquid inlet and a liquid outlet which are connected with the cooling cavity 21. The liquid cooling medium is introduced into the cooling cavity 21 from the liquid inlet through a liquid inlet pipe 22, and flows out from the liquid outlet through the liquid outlet pipe 23, so that the flowing liquid cooling medium is continuously introduced into the cooling cavity 21.

[0032] The excitation rod 10 provided in this embodiment is in a vertical state when in use, and a cooling member 2 is provided between the connecting member 1 and the supporting member 3, and a flowing liquid cooling medium is introduced into the cooling member 2, which can effectively isolate the heat from being transferred from the connecting member 1 to the supporting member 3, and can also realize cooling of the connecting member 1 and the supporting member 3, so that the excitation rod 10 can work normally in a high temperature environment of 750℃~1200℃, avoiding the damage of the moving coil of the exciter 20 by the high temperature transmitted through the excitation rod 10, and realizing the normal application of the excitation signal of the excitation rod 10 in a high temperature environment (750℃~1200℃). The liquid cooling medium can be selected according to the needs, and can be water.

[0033] The connecting member 1 includes a connecting rod 11 and a sleeve 12. The end of the connecting rod 11 close to the cooling member 2 is the first end, and the other end of the connecting rod 11 is the second end. The sleeve 12 is sleeved outside the first end, and the sleeve 12 and the first end are both fixedly connected to the cooling member 2. The second end extends out of the sleeve 12 for fixed connection with the test member 30. Since the connecting rod 11 is a slender metal rod, the material properties are reduced when subjected to high temperature, and it is easy to deform and affect the transmission of vibration signals. The sleeve 1 is fixedly sleeved on the connecting rod 11 to fix and support the connecting rod 11, so that the connecting rod 11 is not easy to deform, and the overall stiffness and strength of the connecting member 1 can be increased, so that the vibration signal can be better transmitted. The sleeve 12 and the first end are both welded to the upper end of the cooling member 2.

[0034] The second end of the connecting rod 11 is provided with an external thread to form an external thread section 111, and the external thread section 111 is used to pass through the test piece 30 and form a fixed connection with the test piece 30 through a nut. Preferably, there is a clearance fit between the external thread section 111 and the hole on the test piece 30 to prevent the failure of assembly due to processing errors, and the external thread section 111 is fixed by threading two nuts on the upper and lower parts of the test piece 30 respectively.

[0035] The support member 3 includes a support tube 31 and a bottom plate 32. One end of the support tube 31 is fixedly connected to the cooling member 2, and the other end of the support tube 31 is fixedly connected to the bottom plate 32. The bottom plate 32 is used to be fixedly connected to the vibrator 20. The thin-walled structure of the support tube 31 can effectively reduce the overall mass of the excitation rod 10, and avoid reducing the thrust of the vibrator 20 due to the excessive mass of the excitation rod 10. Preferably, the upper end of the support tube 31 is welded to the lower end of the cooling member 2, and the lower end of the support tube 31 is welded to the bottom plate 32. The bottom plate 32 and the flange of the vibrator 20 are fixed by bolts, and the safety factor of the connecting bolts is greater than 2. During the high-temperature modal test, the controller sends an electrical signal to drive the vibrator 20 to perform mechanical vibration, and the excitation rod 10 moves with the vibration of the flange of the vibrator 20, so that the excitation spectrum parameters set by the controller are applied to the test piece 30, and the modal parameters of the test piece 30 are excited.

[0036] A plurality of reinforcing ribs 33 are fixedly arranged circumferentially on one end of the support tube 31 for connection with the bottom plate 32, and the reinforcing ribs 33 are all fixedly connected with the bottom plate 32. Preferably, the reinforcing ribs 33 are welded to the support tube 31 and the bottom plate 32.

[0037] The connecting rod 11 is a super-high temperature resistant nickel-based stainless steel rod, has high elasticity and high tensile strength, and can work in a high temperature environment of 750°C to 1200°C.

[0038] The sleeve 12 includes a cylinder body 121 and an end cover 122. The cylinder body 121 is sleeved outside the connecting rod 11. One end of the cylinder body 121 is connected to the upper end of the cooling member 2, and the other end of the cylinder body 121 is fixedly connected to the end cover 122. The connecting rod 11 passes through the end cover 122 and is fixedly connected to the end cover 122. The end cover 122 is connected to the connecting rod 11 and the cylinder body 121.

[0039] The cooling element 2, the supporting tube 31, the bottom plate 32, the reinforcing ribs 33 and the sleeve 12 are all made of 304 stainless steel, and have the characteristics of high elasticity, high tensile strength, high temperature resistance and the like.

[0040] The welding connection positions of each part adopt 2mm continuous welds, and adopt reasonable welding sequence and direction to reduce welding deformation.

[0041] The connecting member 1 and the supporting member 3 are coaxially arranged. After the exciting rod 10 is welded, it is necessary to ensure that the overall coaxiality is no greater than 2 mm and the flatness of the bottom plate 32 is no greater than 0.5 mm to ensure the effective transmission of the exciting force load.

[0042] The cooling member 2 of the exciting rod 10 in this embodiment is a cylindrical tube body with closed ends, and the cylindrical tube body is coaxially arranged with the connecting member 1 and the supporting member 3. The inner wall of the cylindrical tube body forms a cooling cavity 21. In order to increase the connection strength between the cooling member 2 and the connecting member 1 and the supporting member 3, a first annular flange 24 and a second annular flange 25 are respectively formed on the two axial outer end surfaces of the cylindrical tube body along the axial direction outward, one end of the connecting rod 11 is arranged in the first annular flange 24 and is circumferentially welded to the end of the connecting rod 11, a cylinder 121 is arranged outside the first annular flange 24 and is circumferentially welded to the cylinder 121, and a support cylinder 31 is arranged outside the second annular flange 25 and is circumferentially welded to the support cylinder 31;

[0043] In order to facilitate the connection of the liquid inlet pipe 22 and the liquid outlet pipe 23, the cylindrical tube body is circumferentially provided with four through holes 26. Two of the through holes 26 can be selected as the water inlet and the water outlet according to the actual installation position of the exciting rod 10, and the liquid inlet pipe 22 and the liquid outlet pipe 23 are installed respectively, and the axes of the liquid inlet pipe 22 and the liquid outlet pipe 23 are preferably made collinear; the four through holes 26 are all threaded holes. During installation, a pagoda joint is threadedly connected in each of the four threaded holes, and the two collinear pagoda joints are directly blocked with a plugging head, and the other two pagoda joints are respectively put on the liquid inlet pipe 22 and the liquid outlet pipe 23 and then clamped with a clamp. The liquid inlet pipe 22 and the liquid outlet pipe 23 can be selected as a hose, and the pagoda joint is selected for connection. The mating surface of the hose and the joint is relatively deep, and at the same time, it is tightened with the clamp, and the double tightening effectively improves the connection strength.

[0044] The profiles used for each part of the exciting rod 10 should be flat, free of rust and distortion, and the wall thickness deviation of the sleeve 12 and the supporting tube 31 should not exceed ±0.2mm to ensure the processing accuracy.

[0045] Embodiment 2

[0046] This embodiment provides a high temperature modal simulation test device, such as Figure 6 As shown, it includes the excitation rod 10 in the first embodiment, the lower end of the excitation rod 10 is fixedly connected to the exciter 20, preferably, the support tube 31, the bottom plate 32, and the reinforcing rib 33 are welded together and fixedly connected to the flange of the exciter 20 by screws, the upper end of the excitation rod 10 is fixedly connected to the test piece 30, and the test piece is fixedly connected to the fixed column 90; according to the requirements, the high temperature modal simulation test device can also be selected to include but not limited to quartz lamps 40, thermal insulation asbestos felt 50, ceramic rods 60, metal rods 70 and acceleration sensors 80. During the high temperature modal test, the controller sends an electrical signal to drive the exciter 20 to perform mechanical vibration, and the excitation rod 10 moves with the vibration of the flange of the exciter 20, so that the excitation spectrum parameters set by the controller are applied to the test piece 30, and the modal parameters of the test piece 30 are excited. Normal temperature flowing water flows into the cooling element 2 from the liquid inlet pipe 22 , and flows out from the liquid outlet pipe 23 after cooling the cooling element 2 , taking away most of the heat, thereby achieving the effect of cooling the cooling element 2 .

[0047] The high-temperature modal simulation test device provided in this embodiment enables the excitation rod 10 to work normally in a high-temperature environment of 750°C to 1200°C, avoids damage to the moving coil of the exciter 20 caused by the high temperature being transmitted through the excitation rod 10, and realizes the normal application of the excitation signal of the excitation rod 10 in a high-temperature environment (750°C to 1200°C).

[0048] It should be noted that the excitation rod and high-temperature modal simulation test device provided by the present invention are not limited to the above-mentioned parameter design, and can be adaptively changed according to experimental requirements; the cooling part is not limited to a cylindrical tube body, as long as the flowing liquid cooling medium can be passed into the cooling cavity and the heat can be effectively isolated from being transferred from the connecting part to the supporting part; the number of through holes is not limited to 4, and can be set according to actual installation needs; the cooling medium can also be selected according to needs.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A vibration rod, characterized in that: It comprises a connecting member, a cooling member and a supporting member which are fixedly connected in sequence, wherein one end of the connecting member away from the cooling member is used for fixed connection with the test member, and one end of the supporting member away from the cooling member is used for fixed connection with the exciter, a cooling cavity is formed inside the cooling member, and a liquid inlet and a liquid outlet which are connected with the cooling cavity are arranged on the cooling member, and the cooling cavity is used for passing a flowing liquid cooling medium; The connecting member comprises a connecting rod and a sleeve, wherein one end of the connecting rod close to the cooling member is a first end, and the other end of the connecting rod is a second end, the sleeve is sleeved outside the first end, and the sleeve and the first end are both fixedly connected to the cooling member, and the second end extends out of the sleeve for fixed connection with the test member; the second end is provided with an external thread section, and the external thread section is used to pass through the test member and form a fixed connection with the test member through a nut; The support member includes a support tube and a bottom plate, one end of the support tube is fixedly connected to the cooling member, the other end of the support tube is fixedly connected to the bottom plate, the bottom plate is used to be fixedly connected to the exciter, the sleeve includes a cylinder and an end cover, the cylinder is sleeved outside the connecting rod, one end of the cylinder is connected to the cooling member, the other end of the cylinder is fixedly connected to the end cover, and the connecting rod passes through the end cover and is fixedly connected to the end cover; in, The cooling element is a cylindrical tube body with both ends closed, and a first annular flange and a second annular flange are respectively formed on the two axial outer end surfaces of the cylindrical tube body with both ends closed axially outward, one end of the connecting rod is arranged in the first annular flange and is circumferentially welded to the end of the connecting rod, the cylinder body is arranged outside the first annular flange and is circumferentially welded to the cylinder body, and the support cylinder is arranged outside the second annular flange and is circumferentially welded to the support cylinder.

2. The exciting rod according to claim 1, characterized in that: A plurality of reinforcing ribs are fixedly arranged circumferentially on one end of the support tube for connection with the base plate, and the reinforcing ribs are all fixedly connected to the base plate.

3. The exciting rod according to claim 1, characterized in that: The connecting rod is a nickel-based stainless steel rod resistant to ultra-high temperature; the cooling member and the supporting member are both made of 304 stainless steel.

4. The exciting rod according to claim 1, characterized in that: The connecting member and the supporting member are coaxially arranged.

5. A high temperature modal simulation test device, characterized in that: The invention comprises the exciting rod as claimed in any one of claims 1 to 4.

6. A high temperature modal simulation test method, characterized in that: It includes installing the excitation rod according to any one of claims 1 to 4, wherein the end of the connecting member away from the cooling member is fixedly connected to the test piece, the end of the supporting member away from the cooling member is fixedly connected to the exciter, and also includes introducing a flowing liquid cooling medium into the cooling cavity.

7. A method for manufacturing a vibration rod according to any one of claims 1 to 4, characterized in that: The method includes making a connecting member and a supporting member, and also includes the steps of forming a cooling member with a cooling cavity inside and connecting the two ends of the cooling member to the connecting member and the supporting member respectively, and the cooling member is provided with a liquid inlet and a liquid outlet connected to the cooling cavity.

Images