Modal test hammering point positioning device

Abstract

The utility model relates to a modal test hammering point positioning device which comprises a force hammer, the force hammer comprises a hammering head and a laser positioning instrument, the hammering head is used for hammering a to-be-tested point, the laser positioning instrument is used for emitting laser rays to irradiate the to-be-tested point, the laser positioning instrument is movably connected to the hammering head, and the hammering head is used for hammering the to-be-tested point. Therefore, the direction of the laser ray emitted by the laser locator can be adjusted. According to the modal test hammering point positioning device provided by the invention, the hammering position precision can be improved, and the test efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of modal testing technology in the field of NVH (Noise, Vibration, Harshness) testing, and particularly relates to a modal testing hammer strike point positioning device. Background Art

[0002] A mode is an inherent characteristic of an object and can be measured by a force hammer through the hammer strike method. When conducting a modal test using the hammer strike method, it is necessary for the test personnel to hold the force hammer and strike a certain position of the test specimen multiple times in order to measure the frequency response function of the test specimen at that position, and then calculate the mode.

[0003] Currently, when conducting a modal test using a force hammer through the hammer strike method, it is necessary for experienced test personnel to find a suitable preset hammer drop position after repeated hammer strike attempts. Among them, the preset hammer drop position refers to a starting position where the test personnel start to swing the force hammer to ensure that the force hammer can just strike the point to be measured. Then, the formal hammer strike test begins. Before each hammer drop, it is necessary for the test personnel to move the force hammer to the preset hammer drop position by experience. However, this testing technology cannot ensure that the test personnel can move the force hammer to the preset hammer drop position every time, which may lead to a deviation in the actual hammer strike position, and it may be necessary to discard this test and increase the number of tests. This will not only affect the test accuracy but also result in low test efficiency. Utility Model Content

[0004] Based on this, it is necessary to provide a modal testing hammer strike point positioning device that can improve the accuracy of the hammer strike position and the test efficiency.

[0005] A modal testing hammer strike point positioning device, the modal testing hammer strike point positioning device includes a force hammer, the force hammer has a hammer strike head and a laser locator. The hammer strike head is used to strike the point to be measured, and the laser locator is used to emit a laser ray to irradiate the point to be measured. Moreover, the laser locator is movably connected to the hammer strike head so that the direction of the laser ray emitted by the laser locator can be adjusted.

[0006] In one embodiment, the force hammer further includes a connecting rod. One end of the connecting rod is provided with a first ball head, and the connecting rod is rotatably connected to the laser locator through the first ball head; the other end of the connecting rod is provided with a second ball head, and the connecting rod is rotatably connected to the side wall of the hammer strike head through the second ball head.

[0007] In one embodiment, a first ball head seat is installed on the side wall of the laser locator, the first ball head is rotatably connected to the first ball head seat, a second ball head seat is installed on the side wall of the hammer strike head, and the second ball head is rotatably connected to the second ball head seat.

[0008] In one embodiment, the hammer head includes a main body section and a hammering section axially located at one end of the main body section. The diameter of the hammering section is smaller than that of the main body section, and the end of the hammering section facing away from the main body section is used for hammering the point to be measured.

[0009] In one embodiment, the end of the hammering section facing away from the main body section contracts towards the direction close to its own axis and forms a conical head.

[0010] In one embodiment, the main body section and the hammering section are integrally formed.

[0011] In one embodiment, the impact hammer further includes a handle, and the handle is connected to the hammer head and is used for the tester to hold.

[0012] In one embodiment, the laser locator and the handle are respectively connected to the outer peripheral wall of the hammer head, and along the circumferential direction of the hammer head, the laser locator and the handle are arranged staggeredly.

[0013] In one embodiment, the modal test hammering point positioning device further includes a positioning member, the positioning member is attached to the point to be measured, and a positioning mark is provided on the surface of the positioning member, and the positioning mark is used for the laser ray emitted by the laser locator to irradiate and position.

[0014] In one embodiment, a coding mark is further provided on the positioning member, and the coding mark is used for numbering multiple points to be measured.

[0015] Compared with the prior art, the modal test hammering point positioning device provided by the present application can ensure that during the formal hammering test by the tester, the impact hammer can be moved to the preset hammering position each time through the cooperation of the laser locator and the point to be measured. Thus, it can ensure that each time the impact hammer is swung from the preset hammering position, the hammer head can just hammer on the point to be measured, which can not only improve the test accuracy but also improve the test efficiency. Specifically, the process of the tester using the modal test hammering point positioning device provided by the present application for the hammering test is as follows: Before starting the formal hammering test, after repeated hammering attempts by the tester, a suitable preset hammering position is found. It should be noted that the preset hammering position refers to a certain starting position where the tester starts to swing the impact hammer and ensures that the hammer head can just fall on the point to be measured. When the impact hammer is at the preset hammering position, adjust the angle of the laser locator so that the laser ray emitted by the laser locator irradiates on the position to be measured. Then, conduct the formal hammering test. During the formal hammering test, before each hammering, the tester moves the impact hammer so that the laser ray emitted by the laser locator irradiates on the position to be measured. In this way, it can ensure that the impact hammer is just moved to the preset hammering position, so that each time the tester swings the impact hammer from the preset hammering position, the hammer head can just hammer on the point to be measured. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the modal test hammering point positioning device provided by the present application;

[0018] Figure 2 It is a schematic diagram of the assembly of the connecting rod, the laser locator and the cone head in one of the embodiments provided by the present application;

[0019] Figure 3 It is a schematic diagram of the positioning member attached to the object to be measured.

[0020] Reference numerals: 100, modal test hammering point positioning device; 10, force hammer; 11, hammering head; 111, main body section; 112, hammering section; 113, cone head; 114, second ball head seat; 12, laser locator; 121, first ball head seat; 13, connecting rod; 131, first ball head; 132, second ball head; 14, handle; 40, positioning member; 41, positioning mark; 42, coding mark; 200, object to be measured; 210, point to be measured. Detailed Embodiments

[0021] To make the above objects, features and advantages of the present application more obvious and understandable, the following will give a detailed description of the specific embodiments of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In this application, unless otherwise clearly specified and defined, the first feature may be in direct contact with the second feature or in indirect contact with the second feature through an intermediate medium when the first feature is "on" or "under" the second feature. Moreover, when the first feature is "above", "over" or "on top of" the second feature, the first feature may be directly above or diagonally above the second feature, or merely indicate that the first feature has a higher horizontal height than the second feature. When the first feature is "below", "beneath" or "underneath" the second feature, the first feature may be directly below or diagonally below the second feature, or merely indicate that the first feature has a lower horizontal height than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0026] Please refer to Figures 1 to 3 , this application provides a modal test hammering point positioning device 100. The modal test hammering point positioning device 100 includes a force hammer 10. The force hammer 10 has a hammering head 11 and a laser locator 12. One end of the hammering head 11 along the axis is used for hammering a point to be measured 210, and the laser locator 12 is used for emitting a laser ray to irradiate the point to be measured 210. Moreover, the laser locator 12 is movably connected to the hammering head 11 so that the angle between the laser ray emitted by the laser locator 12 and the axis of the hammering head 11 is adjustable.

[0027] By setting up the laser locator 12 and cooperating the laser locator 12 with the point to be measured 210, it can ensure that during the formal hammering test by the tester, the force hammer 10 can be moved to the preset hammer-drop position each time, so as to ensure that swinging the force hammer 10 from the preset hammer-drop position each time can make the hammer head 11 just hammer on the point to be measured 210, which can not only improve the test accuracy but also improve the test efficiency. Specifically, the process of the tester using the modal test hammering point positioning device 100 provided by this application for the hammering test is as follows: Before starting the formal hammering test, after repeated hammering attempts by the tester, a suitable preset hammer-drop position is found. It should be noted that the preset hammer-drop position refers to the starting position where the tester starts to swing the force hammer 10 and ensures that the hammer head 11 can just fall on the point to be measured 210. When the force hammer 10 is at the preset hammer-drop position, adjust the angle of the laser locator 12 so that the laser ray emitted by the laser locator 12 irradiates on the position to be measured. Then, conduct the formal hammering test. During the formal hammering test, before each hammering, the tester moves the force hammer 10 so that the laser ray emitted by the laser locator 12 irradiates on the position to be measured. In this way, it can be ensured that the force hammer 10 is just moved to the preset hammer-drop position, so that when the tester swings the force hammer 10 from the preset hammer-drop position each time, the hammer head 11 can just hammer on the point to be measured 210.

[0028] Among them, the laser locator 12 is movably connected to the hammer head 11 through the connecting rod 13.

[0029] Optionally, in one embodiment, as Figure 2 shown, one end of the connecting rod 13 is provided with a first ball head 131, and the connecting rod 13 is rotationally connected to the laser locator 12 through the first ball head 131. The other end of the connecting rod 13 is provided with a second ball head 132, and the connecting rod 13 is rotationally connected to the side wall of the hammer head 11 through the second ball head 132. Through the first ball head 131 and the second ball head 132, the laser locator 12 can be adjusted in angle along multiple directions. Of course, in other embodiments, it can also be that only the first ball head 131 is provided at one end of the connecting rod 13, or only the second ball head 132 is provided at one end of the connecting rod 13.

[0030] Furthermore, a first ball head seat 121 is installed on the side wall of the laser locator 12, the first ball head 131 is rotationally connected to the first ball head seat 121, a second ball head seat 114 is installed on the side wall of the hammer head 11, and the second ball head 132 is rotationally connected to the second ball head seat 114.

[0031] Optionally, in other embodiments, the connecting rod 13 may also be configured to bend in response to an external force. In this way, the tester can bend the connecting rod 13 by bending it, thereby changing the installation position of the laser locator 12 relative to the hammer head 11, and further changing the direction of the laser beam emitted by the laser locator 12, which is relatively simple to operate.

[0032] The connecting rod 13 is made of aluminum alloy, carbon fiber or copper. Aluminum alloy, carbon fiber and copper are all easily bent by force. The connecting rod 13 made of the above materials is convenient for the test personnel to bend the connecting rod 13 in the required direction.

[0033] See also Figure 1 , the specific structure of the hammer head 11 is introduced below.

[0034] The hammer head 11 includes a main body section 111 and a hammer section 112 axially located at one end of the main body section 111. The diameter of the hammer section 112 is smaller than the diameter of the main body section 111, and the end of the hammer section 112 away from the main body section 111 is used to hammer the test point 210. By providing a hammer section 112 with a smaller diameter, the contact area between the hammer section 112 and the object 200 to be tested can be reduced, so that the hammer section 112 can hammer on the test point 210 more accurately.

[0035] Specifically, the main body section 111 and the hammer section 112 are coaxially arranged, and the main body section 111 and the hammer section 112 are integrally formed. This is conducive to ensuring the structural strength of the hammer head 11.

[0036] Furthermore, the end of the hammer section 112 away from the main section 111 shrinks toward the direction close to its own axis and forms a cone head 113. In this way, the contact area between the hammer section 112 and the object to be measured 200 can be further reduced, so that the hammer section 112 can hammer on the point to be measured 210 more accurately.

[0037] The hammer 10 further includes a handle 14 , which is connected to the hammer head 11 and is used for a tester to hold.

[0038] Exemplarily, in the embodiment, the handle 14 is connected to the outer peripheral wall of the hammer head 11 and is arranged perpendicular to the axis of the hammer head 11. Along the direction from the hammer head 11 to the handle 14, the cross-sectional area of ​​the handle 14 gradually increases.

[0039] In one embodiment, the laser locator 12 is connected to the outer peripheral wall of the hammer head 11, and the laser locator 12 and the handle 14 are staggered along the circumference of the hammer head 11. In this way, the laser locator 12 and the handle 14 can be prevented from interfering with each other, so that the user can adjust the laser locator 12 conveniently.

[0040] like Figure 1and Figure 3 As shown in Figure 3 , the modal test hammering point positioning device 100 further includes a positioning member 40. The positioning member 40 is attached to the point to be measured 210, and a positioning mark 41 is provided on the surface of the positioning member 40. The positioning mark 41 is used for the laser ray emitted by the laser locator 12 to irradiate and locate.

[0041] Optionally, in one embodiment, the positioning member 40 is configured as a sticker, and the positioning mark 41 is configured as a cross mark. The laser ray emitted by the laser locator 12 irradiates at the intersection of the cross mark. In other embodiments, the positioning mark 41 can also be configured as a dot, a triangle mark, etc., as long as it is convenient for the tester to identify.

[0042] An encoding mark 42 is further provided on the positioning member 40. The encoding mark 42 is used to number multiple points to be measured 210.

[0043] Optionally, the encoding mark 42 can adopt digital encoding, letter encoding, or a combination of digital and letter encoding.

[0044] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0045] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A modal test hammer point positioning device, characterized in that: The modal test hammer point positioning device comprises a force hammer (10), wherein the force hammer (10) has a hammer head (11) and a laser locator (12), wherein the hammer head (11) is used for hammering a point to be measured, and the laser locator (12) is used for emitting laser rays to illuminate the point to be measured, and the laser locator (12) is movably connected to the hammer head (11) so that the direction of the laser rays emitted by the laser locator (12) can be adjusted.

2. The modal test hammer point positioning device according to claim 1, characterized in that: The hammer (10) further comprises a connecting rod (13), one end of which is provided with a first ball head (131), and the connecting rod (13) is rotatably connected to the laser locator (12) via the first ball head (131), and the other end of the connecting rod (13) is provided with a second ball head (132), and the connecting rod (13) is rotatably connected to the side wall of the hammer head (11) via the second ball head (132).

3. The modal test hammer point positioning device according to claim 2, characterized in that: A first ball head seat (121) is mounted on the side wall of the laser locator (12), and the first ball head (131) is rotatably connected to the first ball head seat (121); a second ball head seat (114) is mounted on the side wall of the hammer head (11), and the second ball head (132) is rotatably connected to the second ball head seat (114).

4. The modal test hammer point positioning device according to claim 1, characterized in that: The hammer head (11) comprises a main body section (111) and a hammer section (112) located at one end of the main body section (111) along the axial direction, the diameter of the hammer section (112) is smaller than the diameter of the main body section (111), and the end of the hammer section (112) away from the main body section (111) is used for hammering a point to be measured.

5. The modal test hammer point positioning device according to claim 4, characterized in that: The end of the hammer section (112) away from the main section (111) shrinks toward the direction close to its own axis and forms a cone head (113).

6. The modal test hammer point positioning device according to claim 4, characterized in that: The main body section (111) and the hammer section (112) are integrally formed.

7. The modal test hammer point positioning device according to claim 1, characterized in that: The force hammer (10) further comprises a handle (14), wherein the handle (14) is connected to the hammer head (11) and is used for being held by a tester.

8. The modal test hammer point positioning device according to claim 7, characterized in that: The laser locator (12) and the handle (14) are respectively connected to the outer peripheral wall of the hammer head (11), and along the circumference of the hammer head (11), the laser locator (12) and the handle (14) are staggered.

9. The modal test hammer point positioning device according to claim 1, characterized in that: The modal test hammer point positioning device also includes a positioning member (40), the positioning member (40) is attached to the point to be tested, and a positioning mark (41) is provided on the surface of the positioning member (40), and the positioning mark (41) is used for irradiation positioning by laser rays emitted by the laser positioning device (12).

10. The modal test hammer point positioning device according to claim 9, characterized in that: The positioning member (40) is also provided with a coding mark (42), and the coding mark (42) is used to number a plurality of points to be measured.

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