CN114608779B - Plate-level vibration test device and test method - Google Patents
Plate-level vibration test device and test method Download PDFInfo
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- CN114608779B CN114608779B CN202210526152.XA CN202210526152A CN114608779B CN 114608779 B CN114608779 B CN 114608779B CN 202210526152 A CN202210526152 A CN 202210526152A CN 114608779 B CN114608779 B CN 114608779B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The invention discloses a board-level vibration test device and a test method, wherein the board-level vibration test device comprises a plurality of supporting and limiting parts and a reinforcing component, the supporting and limiting parts comprise connecting parts detachably connected with a test piece, all the connecting parts are arranged along the circumferential direction of the test piece, the reinforcing component comprises a first adjusting part and a second adjusting part, the first adjusting part and the second adjusting part are arranged in an operation space, and the distance between the first adjusting part and the second adjusting part is adjustable and used for clamping the test piece. First adjusting piece and second adjusting piece are fixed need not trompil on the test piece to the centre gripping of test piece, avoid installing or the appearance of the not enough installation condition, make the vibration condition of test piece more press close to the actual use condition of test piece, can effectively improve experimental accuracy and validity. Meanwhile, the first adjusting piece and the second adjusting piece can clamp or not clamp the test piece according to needs, and the use is flexible.
Description
Technical Field
The invention relates to the technical field of performance test equipment, in particular to a board-level vibration test device and a board-level vibration test method.
Background
The vibration test is used for evaluating the vibration resistance of the equipment in the expected transportation and use environment, and aims to find defects in product design, process and manufacture, fully master the stress response characteristics and weak links of the product and judge whether the product is qualified or not.
The clamp for the plate-level vibration test needs to consider the installation mode of the test piece in the actual use process so as to truly simulate the vibration environment of the test piece during transportation and use. Due to the characteristic of low rigidity of the PCB, the accuracy and the effectiveness of a test result can be influenced by over-installation or under-installation in the test process. Meanwhile, due to the fact that the arrangement difference of the components on different circuit boards is large, the clamp for adjusting the pretightening force of different positions on the PCB board can be adjusted to have universality according to the arrangement of the components.
Traditional experimental anchor clamps are mainly two kinds, it is first fixed with PCB test piece both sides, PCB board level subassembly after fixing can simplify to corresponding a supporting beam structure, but along with the increase of PCB board size, its natural frequency can descend, when receiving random vibration stress, the PCB board resonates more easily, make the circuit board more fragile, in the in-service use, often can keep away from the position of fastening point at the board, increase sticky mode and increase the strong point to the board, the motion of about board inner region, increase the natural frequency of PCB board. But the gluing mode is not favorable for repeated assembly and disassembly of the PCB, and the glue is easy to loosen in the vibration process, so that the test accuracy is influenced; the second fixture avoids the surface element device, and applies pressing force to the 'return' type area on the PCB around the surface element device, and the periphery of the PCB is completely pressed by the fixture, so that the leading-out end reserved on the periphery of the PCB is also covered by the fixture. The end of drawing forth can't use for in carrying out the vibration test process, the PCB board can't be connected with external circuit, such as circuits such as power, signal excitation, signal reception, can only test the PCB board that is not in operating condition promptly, and the fastening power area that the test piece received is greater than practical application's the condition, has appeared the condition of installing promptly. The vibration magnitude that the test piece actually received can be less than actual conditions through the installation, has reduced the experimental validity of carrying out the simulation to practical application, has also influenced experimental accuracy.
Disclosure of Invention
Therefore, the invention aims to overcome the problems in the prior art and provide the plate-level vibration test device and the test method which can improve the test accuracy.
The technical scheme is as follows:
a board level vibration testing apparatus, comprising:
the device comprises a plurality of supporting and limiting pieces, wherein each supporting and limiting piece comprises a connecting part which is detachably connected with a test piece, and all the connecting parts are arranged along the circumferential direction of the test piece; and
the reinforcing assembly comprises a first adjusting piece and a second adjusting piece, and the distance between the first adjusting piece and the second adjusting piece is adjustable and used for clamping the middle of the test piece.
Above-mentioned board level vibration test device, connecting portion that usable support locating part carries out circumference to the test piece fixedly, the convenience will vibrate when carrying out the vibration test and transmit for the test piece through supporting the locating part, simultaneously the distance between first adjusting piece and the second adjusting piece is adjustable and can carry out the centre gripping to the middle part of test piece fixed, the centre gripping through first adjusting piece and second adjusting piece also can transmit the vibration to the middle part of test piece, and first adjusting piece and second adjusting piece are fixed need not the trompil on the test piece to the centre gripping of test piece, avoid the appearance of installation or the underinstallation condition, the actual use condition of test piece is more pressed close to the vibration condition of messenger's test piece, can effectively improve experimental accuracy and validity. Meanwhile, the first adjusting piece and the second adjusting piece can clamp or not clamp the test piece according to needs, and the use is flexible.
In one embodiment, the plate-level vibration testing apparatus further includes a base, the supporting and limiting member and the reinforcing member are disposed on the base, and positions of the reinforcing member and the supporting and limiting member on the base are adjustable.
In one embodiment, the reinforcing assembly further comprises a supporting beam, the supporting beam comprises a vertical part and a transverse part which are connected, a plurality of positioning parts which are arranged at intervals are arranged on the base, the vertical part and the second adjusting part are respectively matched with different positioning parts, so that the vertical part and the second adjusting part are respectively detachably connected with the base, when the vertical part is arranged on the base, the transverse part and the base are arranged at intervals, the first adjusting part is movably arranged on the transverse part, and the distance between the first adjusting part and the second adjusting part is adjustable.
In one embodiment, the plate-level vibration testing apparatus further includes a first fixing member and a second fixing member, the positioning portion is an opening formed in the base, the first fixing member penetrates through the vertical member and is in threaded engagement with the positioning portion, the first fixing member is a screw or a bolt, the second fixing member penetrates through the second adjusting member and is in threaded engagement with the positioning portion, and the second fixing member is a screw or a bolt.
In one embodiment, a stepped hole is formed in the transverse member, the stepped hole comprises a first hole section and a second hole section which are sequentially arranged along the direction close to the second adjusting member, the aperture of the first hole section is larger than that of the second hole section, and the outer wall of the first adjusting member is in threaded fit with the aperture of the second hole section.
In one embodiment, the plate-level vibration test apparatus further includes a third fixing member, the base is provided with a plurality of assembly holes, the third fixing member penetrates through the supporting limiting member and is in threaded fit with the assembly holes, and the third fixing member is a screw or a bolt.
In one embodiment, the supporting and limiting member further includes an adjusting portion, the adjusting portion is connected to the connecting portion, a strip-shaped hole is formed in the adjusting portion, and the third fixing member penetrates through the strip-shaped hole and can slide along the length direction of the strip-shaped hole.
In one embodiment, a first buffer member is disposed at an end of the first adjusting member close to the second adjusting member, a second buffer member is disposed at an end of the second adjusting member close to the first adjusting member, and when the test piece is clamped between the first adjusting member and the second adjusting member, the first buffer member and the second buffer member respectively abut against two sides of the test piece.
A method of testing comprising the steps of:
modeling a test piece to obtain a model of the test piece;
introducing the fixing mode of the test piece and the vibration stress information in the use environment into the model as parameters, and performing vibration simulation on the model;
obtaining the vibration magnitude distribution of the model in the vibration simulation process;
when the vibration magnitude distribution has an area with the vibration magnitude larger than the preset magnitude, a fixed fulcrum is added at the position, corresponding to the area, in the model, and the vibration magnitude distribution of the model in the vibration simulation process is obtained again until the area with the vibration magnitude larger than the preset magnitude does not exist in the vibration magnitude distribution.
According to the test method, the test piece can be modeled, the vibration simulation of the model can simulate the vibration test of the test piece by introducing the fixed mode of the test piece and the vibration stress information of the use environment into the modeled model, whether the region with the vibration magnitude larger than the preset magnitude exists in the vibration simulation process of the model can be known by acquiring the vibration magnitude distribution of the model in the vibration simulation process and comparing the vibration magnitude distribution with the preset magnitude, the fixed pivot is added to the region with the vibration magnitude larger than the preset magnitude, the vibration simulation is carried out again until the region with the vibration magnitude larger than the preset magnitude does not exist in the vibration magnitude distribution of the model, and the vibration simulation of the model is close to the use environment of the test piece at the moment, so that the accuracy and the effectiveness of the test can be improved.
In one embodiment, the testing method further comprises the following steps:
when no region with the vibration magnitude larger than the preset magnitude exists in the vibration magnitude distribution, performing vibration test on the test piece, wherein the fixing mode of the test piece is the same as that of the model in the vibration simulation process;
obtaining the vibration magnitude distribution of the test piece in the vibration test process and comparing the vibration magnitude distribution with the vibration magnitude distribution of the model in the vibration simulation process;
and when the error value is larger than a preset difference value, changing the fixing mode of the test piece and the model and repeating the steps until the error value is smaller than the preset difference value.
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 are not intended to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of a plate level vibration testing apparatus according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a schematic structural diagram of a support beam according to an embodiment of the present invention;
FIG. 5 is a side view of a second trim element in accordance with an embodiment of the present invention;
FIG. 6 is a top view of FIG. 5;
fig. 7 is an enlarged view at B in fig. 2.
Description of reference numerals:
100. supporting a limiting piece; 110. a connecting portion; 120. an adjustment part; 121. a strip-shaped hole; 200. a reinforcement assembly; 210. a first adjustment member; 220. a second adjustment member; 221. a contact portion; 222. a first section; 223. a second section; 224. mounting holes; 230. a support beam; 231. a vertical member; 232. a cross member; 232a, a stepped hole; 300. a base; 301. a positioning part; 400. a third fixing member; 510. a first buffer member; 520. a second buffer member; 10. and (5) testing the test piece.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
As shown in fig. 1 to fig. 3, an embodiment discloses a board level vibration testing apparatus, which includes a supporting limiting member 100 and a reinforcing member 200. The number of the supporting stoppers 100 is plural. The support limit member 100 includes connecting portions 110 for detachable connection with the test piece 10, and all the connecting portions 110 are arranged along the circumferential direction of the test piece 10. The reinforcing assembly 200 includes a first adjusting member 210 and a second adjusting member 220, and a distance between the first adjusting member 210 and the second adjusting member 220 is adjustable and used for clamping the middle portion of the test piece 10.
Above-mentioned board level vibration test device, connecting portion 110 that usable support locating part 100 carries out circumference to test piece 10 fixedly, conveniently will vibrate when carrying out the vibration test and transmit for test piece 10 through supporting locating part 100, simultaneously the distance between first adjusting piece 210 and the second adjusting piece 220 is adjustable and can carry out the centre gripping to test piece 10 fixed, centre gripping through first adjusting piece 210 and second adjusting piece 220 also can transmit the vibration to the middle part of test piece 10, and first adjusting piece 210 and second adjusting piece 220 are fixed need not to trompil on test piece 10 to the centre gripping of test piece 10, avoid the appearance of installing or the underinstallation condition, make the vibration condition of test piece 10 more press close to the actual service condition of test piece 10, can effectively improve experimental accuracy and validity. Meanwhile, the first adjusting member 210 and the second adjusting member 220 can be used for clamping or not clamping the test piece 10 according to the requirement, and the use is flexible.
Optionally, the plate-level vibration testing apparatus further includes a vibration table, and the supporting limiting member 100 and the reinforcing member 200 are both directly or indirectly disposed on the vibration table, and transmit the vibration of the vibration table to the test piece 10 for performing the vibration test.
In this embodiment, the test piece 10 is a plate, such as a PCB, and in other embodiments, the test piece 10 may have other shapes, such as a rod, a column, etc.
When the test piece 10 is a plate, different support position limiters 100 are respectively connected to each corner of the test piece 10, so that the test piece 10 is sufficiently fixed.
In one embodiment, as shown in fig. 1 to 3, the board level vibration testing apparatus further includes a base 300, and the supporting limiting member 100 and the reinforcing member 200 are disposed on the base 300. The positions of the reinforcing member 200 and the supporting position-limiting member 100 on the base 300 are adjustable. At this time, the positions of the reinforcing component 200 and the supporting and limiting member 100 on the base 300 can be adjusted according to the situation to adjust the fixed pivot of the test piece 10, so that the test piece 10 is closer to the actual use condition of the test piece 10 in the vibration test, and the accuracy of the vibration test is improved.
Optionally, the base 300 is provided on a vibration table. Specifically, the base 300 is detachably connected to the vibration table, the supporting and limiting member 100 and the reinforcing member 200 can be installed on the base 300, and then the base 300 is connected to the vibration table, which facilitates assembly.
In one embodiment, as shown in fig. 1-4, the reinforcement assembly 200 further includes a support beam 230, the support beam 230 including a vertical member 231 and a transverse member 232 connected thereto. The base 300 is provided with a plurality of positioning portions 301 arranged at intervals. The vertical member 231 and the second adjusting member 220 are respectively matched with different positioning portions 301, so that the vertical member 231 and the second adjusting member 220 are respectively detachably connected with the base 300. When the vertical member 231 is disposed on the base 300, the horizontal member 232 is spaced apart from the base 300. The first adjustment member 210 is movably disposed on the cross member 232 such that the distance between the first adjustment member 210 and the second adjustment member 220 is adjustable. After the reinforcing assembly 200 is assembled with the test piece 10, the vertical member 231 is located at one side of the test piece 10, and the horizontal member 232 may extend to the middle of the test piece 10, so that the first adjusting member 210 and the second adjusting member 220 are conveniently matched to clamp the middle of the test piece 10, and no position interference occurs. Meanwhile, the vertical piece 231 and the second adjusting piece 220 are matched with different positioning parts 301 respectively, so that the positions of the supporting beam 230 and the second adjusting piece 220 can be adjusted, the device is convenient to adapt to test pieces 10 of different specifications and adjust the positions of fixed supporting points on the test pieces 10, the fixing effect on the test pieces 10 is better, and the accuracy of vibration testing can be improved.
Optionally, the number of the reinforcing members 200 may be one or at least two, and may be selected according to actual situations. Specifically, the support beam 231 and the second adjustment member 220 may be one; or at least two of the support beam 231 and the second adjusting member 220 may be provided.
Optionally, the number of the vertical members 231 is two, and the two vertical members 231 are respectively connected with two ends of the transverse member 232, so that the structure of the supporting beam 230 is more stable, the first adjusting member 210 and the second adjusting member 220 can provide a larger clamping force, and the clamping effect on the test piece 10 is better.
In this embodiment, the supporting beam 230 and the second adjusting member 220 are independently disposed, and the supporting beam 230 and the second adjusting member 220 can be respectively adjusted on the base 300. In other embodiments, the support beam 230 is coupled to the second adjustment member 220 such that when the support beam 230 and the second adjustment member 220 are adjusted on the base 300, the position between the support beam 230 and the second adjustment member 220 is not changed, thereby facilitating the alignment of the first adjustment member 210 and the second adjustment member 220.
In other embodiments, the position of the reinforcing member 200 on the base 300 can be adjusted by sliding fit with the base 300; or a plurality of parallel inverted T-shaped grooves are formed in the base 300, and after the position of the reinforcing component 200 on the base 300 is adjusted, the reinforcing component 200 can be fixed by using the matching of the bolt component and the inverted T-shaped grooves.
Optionally, a plurality of matching portions are arranged on the transverse member 232 along the length direction, the number of the first adjusting members 210 is at least two, the number of the first adjusting members 210 corresponds to that of the second adjusting members 220, the first adjusting members 210 are detachably connected with the matching portions, and one pair or at least two pairs of the first adjusting members 210 and the second adjusting members 220 can be selected as required to fix the middle part of the test piece 10 at a single point or at least two points.
In one embodiment, as shown in fig. 1 to 3, the plate-level vibration testing apparatus further includes a first fixing member and a second fixing member. The positioning portion 301 is an opening formed in the base 300, and the first fixing member penetrates through the vertical member 231 and is in threaded fit with the positioning portion 301. The first fixing piece is a screw or a bolt. The second fixing member is inserted through the second adjusting member 220 and is in threaded engagement with the positioning portion 301. The second fixing piece is a screw or a bolt. The first and second fixing members are engaged with the positioning portion 301 by threads, so that the support beam 230 and the second adjusting member 220 can be assembled and disassembled, and the operation is convenient.
The first fixing piece and the second fixing piece can be the same or have different specifications.
Optionally, as shown in fig. 5 and 6, the second adjusting element 220 includes a contact portion 221, a first subsection 222 and a second subsection 223, the first subsection 222 and the second subsection 223 are respectively located at two sides of the contact portion 221, the first subsection 222 and the second subsection 223 are both provided with elongated mounting holes 224, the second fixing element penetrates through the mounting holes 224 and is in threaded fit with the positioning portion 301, the second fixing element can slide along the length direction of the mounting holes 224, and after the second fixing element is in threaded fit with the positioning portion 301, the position of the second adjusting element 220 can be finely adjusted through the fit between the mounting holes 224 and the second fixing element, so as to improve the accuracy of the test.
In one embodiment, as shown in fig. 2 and 7, a stepped hole 232a is formed on the transverse member 232, the stepped hole 232a includes a first hole section and a second hole section which are sequentially arranged along a direction close to the second adjusting member 220, a hole diameter of the first hole section is larger than a hole diameter of the second hole section, and an outer wall of the first adjusting member 210 is in threaded fit with a hole wall of the second hole section. The stepped hole 232a of the transverse member 232 facilitates alignment and installation of the first adjusting member 210, and the joint of the first hole section and the second hole section can limit the first adjusting member 210, so as to prevent the first adjusting member 210 from moving to cause an excessive influence on the test piece 10.
In one embodiment, as shown in fig. 1 to 3, the plate-level vibration testing apparatus further includes a third fixing member 400, a plurality of assembly holes are formed on the base 300, the third fixing member 400 penetrates through the supporting limiting member 100 and is in threaded engagement with the assembly holes, and the third fixing member 400 is a screw or a bolt. The third fixing member 400 may pass through the supporting and limiting member 100 and be in threaded fit with different assembling holes, so as to adjust the position of the supporting and limiting member 100 on the base 300, so as to adjust the fixing fulcrum of the test piece 10 and adapt to test pieces 10 of different specifications.
Optionally, the positioning portion 301 is the assembly hole, and the positions of the reinforcing component 200 and the support limiting member 100 on the base 300 can be adjusted by bolts or screws at this time, so that the operation is convenient, and the processing of the base 300 is simpler.
In one embodiment, as shown in fig. 1 to fig. 3, the supporting and limiting member 100 further includes an adjusting portion 120, the adjusting portion 120 is connected to the connecting portion 110, a strip-shaped hole 121 is formed in the adjusting portion 120, and the third fixing member 400 penetrates through the strip-shaped hole 121 and can slide along the length direction of the strip-shaped hole 121. After the third fixing member 400 is in threaded fit with the assembling hole, the position of the supporting and limiting member 100 can be adjusted by unscrewing the third fixing member 400 and sliding the adjusting portion 120 and the third fixing member 400 relatively, which is more convenient to operate.
In one embodiment, as shown in fig. 2 and 7, a first buffering member 510 is disposed at an end of the first adjusting member 210 close to the second adjusting member 220, a second buffering member 520 is disposed at an end of the second adjusting member 220 close to the first adjusting member 210, and when the first adjusting member 210 and the second adjusting member 220 clamp the test piece 10, the first buffering member 510 and the second buffering member 520 respectively abut against two sides of the test piece 10. At this time, the first and second buffers 510 and 520 can clamp the test piece 10 without damaging the components on the test piece 10.
An embodiment discloses a test method, comprising the following steps:
modeling the test piece 10 to obtain a model of the test piece 10;
the fixing mode of the test piece 10 and the vibration stress information in the use environment are taken as parameters to be introduced into a model, and the model is subjected to vibration simulation;
obtaining vibration magnitude distribution of the model in a vibration simulation process;
and when the vibration magnitude distribution has an area with the vibration magnitude larger than the preset magnitude, adding a fixed pivot at the position corresponding to the area in the model, and obtaining the vibration magnitude distribution of the model in the vibration simulation process again until the area with the vibration magnitude larger than the preset magnitude does not exist in the vibration magnitude distribution.
According to the test method, the test piece 10 can be modeled, the fixed mode of the test piece 10 and the vibration stress information of the use environment are introduced into the modeled model, so that the vibration simulation of the model can simulate the vibration test of the test piece 10, the vibration magnitude distribution of the model in the vibration simulation process is obtained and compared with the preset magnitude, whether the region with the vibration magnitude larger than the preset magnitude exists in the vibration simulation process of the model can be known, the fixed pivot is added to the region with the vibration magnitude larger than the preset magnitude, the vibration simulation is carried out again until the region with the vibration magnitude larger than the preset magnitude does not exist in the vibration magnitude distribution of the model, at the moment, the vibration simulation of the model is close to the use environment of the test piece 10, and the accuracy and the effectiveness of the test can be improved.
Optionally, the initial fixing manner of the test piece 10 is to use a plurality of support limiting members 100, the support limiting members 100 include connecting portions 110 for being detachably connected with the test piece 10, and all the connecting portions 110 are arranged along the circumferential direction of the test piece 10.
Alternatively, when there is a region having a vibration magnitude larger than a predetermined magnitude in the vibration magnitude distribution, a fixed pivot may be added to a position corresponding to the region in the model, and the region may be clamped and fixed by the first adjusting member 210 and the second adjusting member 220 of the reinforcing assembly 200.
In one embodiment, the testing method further comprises the following steps:
when no region with the vibration magnitude larger than the preset magnitude exists in the vibration magnitude distribution, performing vibration test on the test piece 10, wherein the fixing mode of the test piece 10 is the same as that of the model in the vibration simulation process;
obtaining the vibration magnitude distribution of the test piece 10 in the vibration test process and comparing the vibration magnitude distribution with the vibration magnitude distribution of the model in the vibration simulation process;
and when the error value is larger than the preset difference value, changing the fixing mode of the test piece 10 and the model and repeating the steps until the error value is smaller than the preset difference value.
When the vibration magnitude distribution does not have the area with the vibration magnitude larger than the preset magnitude, the test piece 10 is fixedly installed according to the fixing mode of the model in the vibration simulation process, the test piece 10 is subjected to vibration testing, the vibration magnitude distribution of the test piece 10 in the vibration testing process is obtained and compared with the vibration magnitude distribution of the model in the vibration simulation process, if the error value is larger than the preset difference value, the difference between the vibration simulation of the model and the use environment of the test piece 10 is larger, the fixing mode of the test piece 10 and the model is changed, the vibration simulation and the vibration testing are carried out again until the error value is smaller than the preset difference value, at the moment, the vibration simulation of the model is close to the use environment of the test piece 10, and the accuracy and the effectiveness of the test can be improved.
The difference between the vibration magnitudes of the test piece 10 and the model at the corresponding positions is an error value, specifically, a position on the test piece 10 is used as a sampling point to obtain the vibration magnitude of the sampling point, and the model is obtained by modeling according to the test piece 10, so that the model has a simulation point corresponding to the sampling point to obtain the vibration magnitude of the simulation point, and the difference between the vibration magnitude of the sampling point and the vibration magnitude of the simulation point can be used as the error value.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
Claims (7)
1. A board level vibration test device, characterized by includes:
the device comprises a plurality of supporting and limiting pieces, wherein each supporting and limiting piece comprises a connecting part which is detachably connected with a test piece, and all the connecting parts are arranged along the circumferential direction of the test piece;
the supporting and limiting part is arranged on the base, the position of the supporting and limiting part on the base is adjustable, and a plurality of positioning parts arranged at intervals are arranged on the base; and
strengthen the subassembly, strengthen the subassembly and include first adjustment piece, second adjustment piece and a supporting beam, a supporting beam is including the vertical piece and the horizontal piece of connection, the vertical piece reaches the second adjustment piece respectively with the difference location portion cooperation makes the vertical piece with the second adjustment piece respectively with the connection can be dismantled to the base, works as the vertical piece is located when on the base, the horizontal piece with the base interval sets up, first adjustment piece is portable to be located on the horizontal piece, makes first adjustment piece with distance between the second adjustment piece is adjustable, just first adjustment piece with the second adjustment piece is used for the centre gripping the middle part of test piece.
2. The board-level vibration testing device according to claim 1, further comprising a first fixing member and a second fixing member, wherein the positioning portion is an opening formed in the base, the first fixing member penetrates through the vertical member and is in threaded fit with the positioning portion, the first fixing member is a screw or a bolt, the second fixing member penetrates through the second adjusting member and is in threaded fit with the positioning portion, and the second fixing member is a screw or a bolt.
3. The plate-level vibration testing device of claim 1, wherein a stepped hole is formed in the cross member, the stepped hole comprises a first hole section and a second hole section which are sequentially arranged in a direction close to the second adjusting member, the diameter of the first hole section is larger than that of the second hole section, and the outer wall of the first adjusting member is in threaded fit with the wall of the second hole section.
4. The plate-level vibration testing device of claim 1, further comprising a third fixing member, wherein a plurality of assembly holes are formed in the base, the third fixing member penetrates through the supporting and limiting member and is in threaded fit with the assembly holes, and the third fixing member is a screw or a bolt.
5. The plate-level vibration test device of claim 4, wherein the supporting and limiting member further comprises an adjusting portion, the adjusting portion is connected with the connecting portion, a strip-shaped hole is formed in the adjusting portion, and the third fixing member penetrates through the strip-shaped hole and can slide along the length direction of the strip-shaped hole.
6. The plate-level vibration testing device according to any one of claims 1 to 5, wherein a first cushion member is provided at an end of the first adjusting member close to the second adjusting member, a second cushion member is provided at an end of the second adjusting member close to the first adjusting member, and the first cushion member and the second cushion member abut against both sides of the test piece when the test piece is sandwiched between the first adjusting member and the second adjusting member.
7. A testing method, characterized in that the plate-level vibration testing apparatus according to any one of claims 1 to 6 is used, comprising the steps of:
modeling a test piece to obtain a model of the test piece;
introducing the fixing mode of the test piece and the vibration stress information in the use environment into the model as parameters, and performing vibration simulation on the model;
obtaining the vibration magnitude distribution of the model in the vibration simulation process;
when an area with the vibration magnitude larger than the preset magnitude exists in the vibration magnitude distribution, a fixed fulcrum is added at a position corresponding to the area in the model, and the vibration magnitude distribution of the model in the vibration simulation process is obtained again until the area with the vibration magnitude larger than the preset magnitude does not exist in the vibration magnitude distribution;
when no region with the vibration magnitude larger than the preset magnitude exists in the vibration magnitude distribution, performing vibration test on the test piece by using the plate-level vibration testing device, wherein the fixing mode of the test piece is the same as that of the model in the vibration simulation process;
obtaining the vibration magnitude distribution of the test piece in the vibration test process and comparing the vibration magnitude distribution with the vibration magnitude distribution of the model in the vibration simulation process;
and when the error value is larger than a preset difference value, changing the fixing mode of the test piece and the model and repeating the steps until the error value is smaller than the preset difference value.
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