CN214121407U - Be used for whole car sound cavity modal testing arrangement - Google Patents
Be used for whole car sound cavity modal testing arrangement Download PDFInfo
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- CN214121407U CN214121407U CN202120282264.6U CN202120282264U CN214121407U CN 214121407 U CN214121407 U CN 214121407U CN 202120282264 U CN202120282264 U CN 202120282264U CN 214121407 U CN214121407 U CN 214121407U
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Abstract
The utility model relates to a be used for whole car sound cavity modal testing arrangement belongs to car vibration noise detection field. A modal testing device for an acoustic cavity of a finished automobile comprises: four tripod bases; the bottom ends of the four support frames are respectively sleeved with the four tripod bases and are fixed through the rod frame adjusting bolts; two ends of the longitudinal rod are respectively fixed with the tops of the two support frames through the double-wire fixing clamp; two ends of the transverse rod are respectively connected with the two longitudinal rods through the double-wire fixing clamp; the microphone fixing frame is sleeved on the transverse rod. The utility model discloses following beneficial effect has: 1. the accuracy and the reliability of the data are effectively ensured; 2. the carrying is easy; 3. the space position can be adjusted through the fixity of the double-wire fixing clamp to the microphone fixing support, and the range from the bottom to the end part of the rod piece can be adjusted.
Description
Technical Field
The utility model relates to a be used for whole car sound cavity modal testing arrangement belongs to car vibration noise detection field.
Background
With the continuous development of social life, people have increasingly strengthened environmental awareness, automobile noise becomes an important performance index of automobiles, and people put forward higher and higher requirements on the acoustic characteristics and riding comfort of vehicles, so that how to reduce the noise of the automobiles becomes a problem to be solved urgently.
The automobile noise is roughly divided into two aspects, one is air noise which is mainly the engine noise, and the air intake and exhaust noise and the like are transmitted into the automobile through air; the second is structural noise, which is mainly resonance rolling generated by frequency coupling of an engine, a vehicle body metal plate and a reinforcing beam. And the research on the structural noise needs to use the whole vehicle sound cavity mode.
The effect of the whole vehicle sound cavity mode has two aspects: on one hand, the method can be used for establishing a sound cavity finite element model by combining simulation in the early stage of the whole vehicle development, guiding the design of a vehicle body and avoiding the frequency coupling of the whole vehicle sound cavity mode with a vehicle body metal plate and a stiffening beam in the later stage; on the other hand, the method can also be used as a theoretical basis for solving certain problems in the later automobile vibration noise development period.
However, most of the existing mechanisms adopt a transverse rod and a plurality of microphones additionally arranged on the transverse rod when measuring the mode of the sound cavity, and the transverse rod is repeatedly moved in different directions to determine the spatial position of the microphone, so that the efficiency is low, the transverse rod is not easy to fix, the accuracy and the reliability of the obtained data are not high, and the accuracy of the data is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: to the defect that exists among the above prior art, the utility model provides a be used for putting in order car sound chamber modal testing arrangement, it both can diversely adjust the transverse bar and confirm microphone spatial position fast, but the fixed transverse bar of efficient again. Through the utility model discloses a when the device can solve the whole car sound cavity mode of test, the poor fixed problem of microphone spatial position inefficiency problem and transverse bar is confirmed to the not equidirectional removal transverse bar of repetition, has guaranteed the accuracy and the reliability of data effectively to improve convenience, the accuracy of experimental operation on this basis, testing arrangement's commonality, repeatability have reduced the objective condition restriction.
The technical scheme is as follows: a modal testing device for an acoustic cavity of a finished automobile comprises:
four tripod bases;
the bottom ends of the four support frames are respectively sleeved with the four tripod bases and are fixed through the rod frame adjusting bolts;
two ends of the longitudinal rod are respectively fixed with the tops of the two support frames through double-wire fixing clamps;
two ends of the transverse rod are respectively connected with the two longitudinal rods through the double-wire fixing clamp;
and the microphone fixing frame is sleeved on the transverse rod.
Further, the tripod base comprises:
the bottom of the base body is a round table, three rectangular hole surfaces are uniformly distributed in the middle of the periphery of the round table, a cylindrical sleeve extends upwards from the top surface of the round table, the cylindrical sleeve is provided with a cylindrical blind hole, the inner diameter of the cylindrical blind hole is matched with the diameter of the bottom of the support frame, and a first screw hole matched with the rod frame adjusting bolt is formed in the middle of the cylindrical sleeve;
and one end of each of the three support legs is clamped with the three rectangular hole surfaces.
Further, the supporting leg is provided with a spring cap capable of rebounding when being loosened, and the spring cap is matched with the rectangular hole surface.
Further, the support frame includes:
the length of the first supporting pipe is 50cm, and a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the first supporting pipe;
the bottom end of the second supporting pipe is internally sleeved at the upper end of the first supporting pipe and is screwed and fixed through the rod frame adjusting bolt, a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the second supporting pipe, and the length of the second supporting pipe is 60 cm;
and the bottom of the third supporting pipe is internally sleeved at the upper end of the second supporting pipe and is screwed and fixed through the rod frame adjusting bolt, a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the third supporting pipe, and the length of the third supporting pipe is 50 cm.
Further, the transverse bar comprises:
a first transverse cannula having a length of 60 cm;
a third transverse cannula having a length of 60 cm;
and the length of the second transverse sleeve is 70cm, third screw holes matched with the rod frame adjusting bolts are formed in two ends of the second transverse sleeve, and two ends of the second transverse sleeve are respectively sleeved outside one end of the third transverse sleeve and are screwed and fixed through the rod frame adjusting bolts.
Further, the double-wire fixing clip includes:
a sleeve portion;
the double wires are arranged at the top of the sleeve part, and butterfly bolts are arranged on the double wires and used for tightening the double wires;
the friction skin is arranged on two opposite inner side surfaces of the double filaments.
Furthermore, two ends of the longitudinal rod are respectively sleeved with the double wires of the double-wire fixing hoop and are fixed through butterfly bolts;
the sleeve part of the double-wire fixing hoop is sleeved on the top of the support frame and is screwed and fixed through the rod frame adjusting bolt.
Furthermore, two ends of the transverse rod are respectively sleeved with a sleeve part of the double-wire fixing hoop, and double wires of the two double-wire fixing hoops are respectively sleeved with the longitudinal rod and fixed through butterfly bolts.
Further, the microphone fixing frame includes:
the device comprises a sleeve part, a connecting rod and a connecting rod, wherein a rod frame adjusting bolt for fixing is arranged on the sleeve part, and a rectangular through hole is formed in the bottom of the sleeve part;
and the U-shaped clamping groove is used for fixing the microphone, the U-shaped clamping groove is connected with one end of the connecting piece, and the other end of the connecting piece is connected with the bottom of the sleeve part.
Furthermore, the longitudinal rod is formed by sequentially sleeving a plurality of longitudinal sleeves, and two adjacent longitudinal sleeves are screwed and fixed through the rod frame adjusting bolt.
Furthermore, the longitudinal rod is formed by sequentially sleeving four longitudinal sleeves, wherein the length of three longitudinal sleeves is 100cm, and the length of one longitudinal sleeve, namely the longitudinal sleeve, is 110 cm.
Has the advantages that: the utility model discloses a be used for whole car sound cavity modal testing arrangement has following beneficial effect:
1. the accuracy and the reliability of data are effectively guaranteed, the convenience and the accuracy of experimental operation are improved on the basis, the universality and the repeatability of a testing device are improved, and the objective condition limit is reduced;
2. the support frame, the transverse rod and the longitudinal rod can be detached;
3. the space position of the microphone fixing support can be adjusted through the fixity of the double-wire fixing hoop, and the space position can be adjusted from the bottom to the end part of the rod piece, the microphone fixing support can be sleeved with a plurality of transverse rods to be matched with the longitudinal rods to move randomly in a vehicle space through the double-wire fixing hoop (the longitudinal rod sleeve supporting rod can move up and down, and the transverse rod sleeve longitudinal rod can move back and forth, wherein the sleeve is realized through the double-wire hoop). Meanwhile, as long as the sensors are enough, a transverse rod and a longitudinal rod can be added. Simultaneously, the whole test can be measured at one time.
Drawings
Fig. 1 is a schematic diagram of a device for testing a sound cavity mode of a whole vehicle according to the present invention;
FIG. 2 is a schematic view of a tripod base;
FIG. 3 is a schematic view of the assembled tripod base and support stand;
FIG. 4 is a schematic view of the connection between the microphone holder and the lever adjusting bolt;
FIG. 5 is a schematic view of a dual wire retaining clip;
wherein:
1: tripod base
1-1: rectangular hole surface 1-2: supporting leg
1-3: cylindrical sleeve 1-4: first screw hole
2: 2-1 of a support frame: second screw hole
3: transverse bar
4: longitudinal rod
5: microphone fixing frame
5-1: 5-2 of U-shaped clamping groove: rectangular via hole
6: adjusting bolt for rod frame
7: double-thread fixing clamp
7-1: 7-2 of butterfly bolt: double filament
7-3: friction leather
The specific implementation mode is as follows:
the following describes the embodiments of the present invention in detail.
As shown in fig. 1 to 5, a device for testing the modal of an acoustic cavity of a whole vehicle includes:
four tripod bases 1;
the bottom ends of the four support frames 2 are respectively sleeved with the four tripod bases 1 and are fixed through the rod frame adjusting bolts 6;
two ends of the longitudinal rods 4 are respectively fixed with the tops of the two support frames 2 through double-wire fixing clamps 7;
two ends of the transverse rod 3 are respectively connected with the two longitudinal rods 4 through the double-wire fixing clamp 7;
and the microphone fixing frame 5 is sleeved on the transverse rod 3.
Further, the tripod base 1 includes:
the bottom of the base body is a round table, three rectangular hole surfaces 1-1 are uniformly distributed in the middle of the periphery of the round table, a cylindrical sleeve 1-3 extends upwards from the top surface of the round table, the cylindrical sleeve 1-3 is provided with a cylindrical blind hole, the inner diameter of the cylindrical blind hole is matched with the diameter of the bottom of the support frame 2, and a first screw hole 1-4 matched with a rod frame adjusting bolt 6 is formed in the middle of the cylindrical sleeve 1-3;
one end of each of the three support legs 1-2 is clamped with the three rectangular hole surfaces 1-1.
Further, the supporting leg 1-2 is provided with a spring cap which can rebound when being loosened, and the spring cap is matched with the rectangular hole surface 1-1.
Further, the support frame 2 includes:
the length of the first supporting pipe is 50cm, and a second screw hole 2-1 matched with the rod frame adjusting bolt 6 is formed in the upper end of the first supporting pipe;
the bottom end of the second supporting pipe is internally sleeved at the upper end of the first supporting pipe and is screwed and fixed through the rod frame adjusting bolt 6, a second screw hole 2-1 matched with the rod frame adjusting bolt 6 is formed in the upper end of the second supporting pipe, and the length of the second supporting pipe is 60 cm;
the bottom of the third supporting pipe is internally sleeved at the upper end of the second supporting pipe and is screwed and fixed through a rod frame adjusting bolt 6, a second screw hole 2-1 matched with the rod frame adjusting bolt 6 is formed in the upper end of the third supporting pipe, and the length of the third supporting pipe is 50 cm.
Further, the transverse bar 3 comprises:
a first transverse cannula having a length of 60 cm;
a third transverse cannula having a length of 60 cm;
and the length of the second transverse sleeve is 70cm, third screw holes matched with the rod frame adjusting bolts 6 are formed in two ends of the second transverse sleeve, and two ends of the second transverse sleeve are respectively sleeved outside one end of the third transverse sleeve and are screwed and fixed through the rod frame adjusting bolts 6.
Further, a double wire fixing clip 7, comprising:
a sleeve portion;
the double-wire 7-2 is arranged at the top of the sleeve part, a butterfly bolt 7-1 is arranged on the double-wire 7-2, and the butterfly bolt 7-1 is used for tightening the double-wire 7-2;
the friction skin 7-3 is arranged on two opposite inner side surfaces of the double filaments 7-2.
Furthermore, two ends of the longitudinal rod 4 are respectively sleeved with the double wires 7-2 of the double-wire fixing hoop 7 and are fixed through butterfly bolts 7-1;
the sleeve part of the double-thread fixing clamp 7 is sleeved on the top of the support frame 2 and is screwed and fixed through the rod frame adjusting bolt 6.
Further, both ends of the transverse rod 3 are respectively sleeved with a sleeve part of a two-wire fixing clamp 7, and two wires 7-2 of the two-wire fixing clamps 7 are respectively sleeved with the longitudinal rod 4 and fixed through butterfly bolts 7-1.
Further, the microphone holder 5 includes:
the sleeve part is provided with a rod frame adjusting bolt 6 for fixing, and the bottom of the sleeve part is provided with a rectangular through hole 5-2;
and the U-shaped clamping groove 5-1 is used for fixing the microphone, the U-shaped clamping groove 5-1 is connected with one end of the connecting piece, and the other end of the connecting piece is connected with the bottom of the sleeve part.
Further, the longitudinal rod 4 is formed by sequentially sleeving a plurality of longitudinal sleeves, and two adjacent longitudinal sleeves are screwed and fixed through the rod frame adjusting bolt 6.
Furthermore, the longitudinal rod 4 is formed by sequentially sleeving four longitudinal sleeves, wherein three longitudinal sleeves have a length of 100cm, and one longitudinal sleeve has a length of 110 cm.
When the double-wire fixing clamp 7 is used, the double-wire fixing clamp 7 is sleeved on the supporting rod 2 or the longitudinal rod 4, the butterfly bolt 7-1 is used for rotating to push the two ends of the double wire 7-2 to separate, so that the sleeve hole is shrunk, and the friction skin 7-3 on the double wire 7-2 gradually clings to the supporting rod 2 or the longitudinal rod 4 so as to fix the position through clamping force.
The installation process is as follows:
the utility model discloses an installation divide into three steps: the lower base is vertically connected, the upper rod piece is horizontally connected, and the upper rod piece is fixedly installed;
the lower base is vertically connected: the support legs 1-2 of the tripod base 1 can be firmly stretched and stand on the floor of the vehicle, and the support rods 2 can be vertically inserted into the upper round hole columns 1-3 of the tripod base 1 and fixed by using the rod frame fixing bolts 6.
Secondly, horizontally connecting the upper rod pieces: the support rod 2 is adjusted to a proper height and is sized through a plurality of rod frame adjusting bolts 6; adjusting the transverse rod 3 to a proper width and fixing the dimension by a plurality of rod frame adjusting bolts 6; the longitudinal bars 4 are adjusted to the appropriate length by a plurality of bar-holder adjusting bolts 6 to size. The moment of the upper horizontal connection middle rod frame adjusting bolt 6 is at least more than 8N, so that the reasonable fixation can be ensured.
And thirdly, fixedly mounting an upper rod piece: the dimension adjustment and fixation of the support rod 2, the transverse rod 3 and the longitudinal rod 4 are realized through a rod frame adjusting bolt 6; the transverse rod 3 moves up, down, front and back, the butterfly bolt 7-1 is used for rotationally pushing two ends of the double wire 7-2 to separate through the double wire fixing hoop 7 so as to enable the trepanning to shrink, and the friction skin 7-3 on the double wire 7-2 gradually clings to the support rod 2 or the longitudinal rod 4 so as to fix the position through clamping force; the longitudinal rod 4 moves up, down, front and back by the working principle of the double-wire fixing hoop 7. The moment of the butterfly bolt 7-1 in the double-thread fixed hoop 7 in the fixed installation of the upper rod piece can be at least more than 8N to ensure reasonable fixation.
The embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by a person of ordinary skill in the art.
Claims (10)
1. The utility model provides a be used for whole car sound cavity modal testing arrangement which characterized in that includes:
four tripod bases;
the bottom ends of the four support frames are respectively sleeved with the four tripod bases and are fixed through the rod frame adjusting bolts;
two ends of the longitudinal rod are respectively fixed with the tops of the two support frames through double-wire fixing clamps;
two ends of the transverse rod are respectively connected with the two longitudinal rods through the double-wire fixing clamp;
and the microphone fixing frame is sleeved on the transverse rod.
2. The modal testing device for a finished vehicle acoustic cavity of claim 1 wherein the tripod base comprises:
the bottom of the base body is a round table, three rectangular hole surfaces are uniformly distributed in the middle of the periphery of the round table, a cylindrical sleeve extends upwards from the top surface of the round table, the cylindrical sleeve is provided with a cylindrical blind hole, the inner diameter of the cylindrical blind hole is matched with the diameter of the bottom of the support frame, and a first screw hole matched with the rod frame adjusting bolt is formed in the middle of the cylindrical sleeve;
and one end of each of the three support legs is clamped with the three rectangular hole surfaces.
3. The modal testing device for the sound cavity of the whole vehicle as recited in claim 2, wherein the supporting leg is provided with a spring cap which can rebound when released, and the spring cap is adapted to the rectangular hole surface.
4. The modal testing device for the acoustic cavity of a finished vehicle of claim 1, wherein the support frame comprises:
the length of the first supporting pipe is 50cm, and a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the first supporting pipe;
the bottom end of the second supporting pipe is internally sleeved at the upper end of the first supporting pipe and is screwed and fixed through the rod frame adjusting bolt, a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the second supporting pipe, and the length of the second supporting pipe is 60 cm;
and the bottom of the third supporting pipe is internally sleeved at the upper end of the second supporting pipe and is screwed and fixed through the rod frame adjusting bolt, a second screw hole matched with the rod frame adjusting bolt is formed in the upper end of the third supporting pipe, and the length of the third supporting pipe is 50 cm.
5. The modal testing assembly for a finished vehicle acoustic cavity of claim 1 wherein the cross bar comprises:
a first transverse cannula having a length of 60 cm;
a third transverse cannula having a length of 60 cm;
and the length of the second transverse sleeve is 70cm, third screw holes matched with the rod frame adjusting bolts are formed in two ends of the second transverse sleeve, and two ends of the second transverse sleeve are respectively sleeved outside one end of the third transverse sleeve and are screwed and fixed through the rod frame adjusting bolts.
6. The modal testing device for the acoustic cavity of a finished vehicle of claim 1, wherein the dual wire clamp comprises:
a sleeve portion;
the double wires are arranged at the top of the sleeve part, and butterfly bolts are arranged on the double wires and used for tightening the double wires;
the friction skin is arranged on two opposite inner side surfaces of the double filaments.
7. The modal testing device for the sound cavity of the whole vehicle as recited in claim 6, wherein two ends of the longitudinal rod are respectively sleeved with the double wires of one double-wire fixing hoop and fixed through butterfly bolts;
the sleeve part of the double-wire fixing hoop is sleeved on the top of the support frame and is screwed and fixed through the rod frame adjusting bolt.
8. The modal testing device for the acoustic cavity of the whole vehicle as recited in claim 6, wherein two ends of the cross bar are respectively sleeved with a sleeve portion of the two-wire fixing clamp, and two wires of the two-wire fixing clamp are respectively sleeved with the longitudinal bar and fixed through butterfly bolts.
9. The modal testing device for a finished vehicle acoustic cavity of claim 1, wherein the microphone mount comprises:
the device comprises a sleeve part, a connecting rod and a connecting rod, wherein a rod frame adjusting bolt for fixing is arranged on the sleeve part, and a rectangular through hole is formed in the bottom of the sleeve part;
and the U-shaped clamping groove is used for fixing the microphone, the U-shaped clamping groove is connected with one end of the connecting piece, and the other end of the connecting piece is connected with the bottom of the sleeve part.
10. The modal testing device for the sound cavity of the whole vehicle as recited in claim 1, wherein the longitudinal rod is formed by sequentially sleeving a plurality of longitudinal sleeves, and two adjacent longitudinal sleeves are screwed and fixed through a rod frame adjusting bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120282264.6U CN214121407U (en) | 2021-02-01 | 2021-02-01 | Be used for whole car sound cavity modal testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120282264.6U CN214121407U (en) | 2021-02-01 | 2021-02-01 | Be used for whole car sound cavity modal testing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214121407U true CN214121407U (en) | 2021-09-03 |
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ID=77496198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120282264.6U Active CN214121407U (en) | 2021-02-01 | 2021-02-01 | Be used for whole car sound cavity modal testing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214121407U (en) |
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2021
- 2021-02-01 CN CN202120282264.6U patent/CN214121407U/en active Active
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