CN112067290A - New energy electric vehicle driving shaft vibration testing device, system and method - Google Patents
New energy electric vehicle driving shaft vibration testing device, system and method Download PDFInfo
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Abstract
The invention provides a device, a system and a method for testing the vibration of a driving shaft of a new energy electric automobile, wherein the testing device comprises a dynamometer, a rotating hub and a supporting frame; the dynamometer is fixedly arranged on the support frame and is connected with wheels of the electric automobile through a driving shaft, and an arrangement included angle a is formed between the driving shaft and the horizontal plane where the wheels are located; the dynamometer drives the wheels to rotate through the driving shaft according to a preset program; by adopting the technical scheme, the influence of the arrangement angle of the driving shaft on the acceleration jitter of the whole vehicle can be verified in the early design verification stage of the pure electric vehicle, so that the problem of the acceleration jitter of the whole vehicle caused by the arrangement angle of the driving shaft can be avoided; according to the scheme provided by the invention, the testing device, the testing system and the testing method are simple and convenient to operate, the measuring accuracy is good, the design requirements of the current pure electric vehicle can be met, the performance of the pure electric vehicle is improved, and the development of new energy vehicles is promoted.
Description
Technical Field
The invention belongs to the technical field of vibration testing of a new energy automobile driving shaft, and particularly relates to a device, a system and a method for testing vibration of a new energy electric automobile driving shaft.
Background
In recent years, with the development of pure electric vehicles, more and more new energy vehicles are in turn transported. The existing new energy automobile is developed to remove the design of the three electric parts, most of automobile enterprises still refer to the design experience of the traditional automobile, but part of new energy automobile structural parts are developed and designed to cause systematic NVH (noise, vibration and harshness) problems such as acceleration and vibration if referring to the design experience of the traditional automobile, the existing pure electric automobile always pursues the dynamic property, the total output torque of the electric automobile is relatively large, the arrangement angle requirement of the driving shaft of the traditional automobile is generally less than 6-7 degrees, if the pure electric automobile is designed identically, the larger the output torque of the pure electric automobile is, the larger the additional bending moment applied to the input shaft bell housings at the two ends of the universal joint and the output shaft star-shaped sleeve is, and the vibration phenomenon of the whole automobile in the acceleration running process of the whole automobile is more obvious.
Based on the technical problems existing in the design process of the arrangement angle of the driving shaft of the existing electric automobile, no relevant solution is provided; there is therefore a pressing need to find effective solutions to the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the device, the system and the method for testing the vibration of the driving shaft of the new energy electric vehicle, which can verify the influence of the arrangement angle of the driving shaft on the acceleration jitter of the whole vehicle in the early design verification stage of the pure electric vehicle, so that the problem of the acceleration jitter of the whole vehicle caused by the arrangement angle of the driving shaft can be avoided.
The invention provides a vibration testing device for a new energy electric automobile driving shaft, which can be used for design testing of the existing new energy electric automobile driving shaft; the test device comprises a dynamometer, a rotating hub and a supporting frame; the dynamometer is fixedly arranged on the support frame and is connected with wheels of the electric automobile through a driving shaft, and an arrangement included angle a is formed between the driving shaft and the horizontal plane where the wheels are located; the dynamometer drives the wheels to rotate through the driving shaft according to a preset program.
Further, the drive shaft includes a first drive shaft and a second drive shaft; one side of the dynamometer is connected with one side of the first wheel through a first driving shaft, and the other side of the dynamometer is connected with one side of the second wheel through a second driving shaft; the other side of the first wheel is connected to the support frame through a load spring and is positioned on one side of the dynamometer; the other side of the second wheel is connected to the support frame through a load spring and is positioned on the other side of the dynamometer; the first wheel and the second wheel are respectively placed on the rotating hub and are positioned on two sides of the dynamometer.
Furthermore, a vibration sensor is arranged at the joint of the output end of the driving shaft and the wheel, and the vibration sensor is electrically connected with a computer of the testing device; the vibration sensor is used for collecting vibration sensor signals in the driving shaft torque output process and transmitting the vibration sensor signals to the computer of the testing device.
Furthermore, the vibration sensor is respectively used for acquiring vibration signals of the inner structure x, y and z of the universal joint at the output end of the driving shaft; the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal, and compares the vibration curve with a target curve for analysis, so that the optimal arrangement angle of the driving shaft is obtained; the dynamometer is input to a controller of the dynamometer according to a full-accelerator acceleration torque output strategy of the electric automobile, and the dynamometer simulates the torque output of the whole automobile through the full-accelerator acceleration torque output strategy by controlling a driving shaft.
Furthermore, a lifting structure is arranged on the supporting frame, and the dynamometer is arranged on the lifting structure and can move up and down along with the dynamometer arranged on the lifting structure; the dynamometer moves up and down so as to adjust an arrangement included angle a formed by the driving shaft and a horizontal plane where the wheels are located.
Furthermore, the lifting structure comprises a left supporting rod, a right supporting rod and a connecting rod; the two ends of the connecting rod are respectively arranged on the left supporting rod and the right supporting rod along the horizontal direction and can move up and down along the vertical direction along with the left supporting rod and the right supporting rod.
Further, the dynamometer is fixedly connected to the connecting rod through a fixing rod; one end of the wheel is connected to the connecting rod through a load spring, so that the load force of the wheel is ensured to be constant.
Correspondingly, the invention also provides a vibration testing system for the driving shaft of the new energy electric automobile, which comprises a lifting structure, a dynamometer, a rotating hub and a vibration sensor; two sides of the dynamometer are respectively connected with wheels of the electric automobile through a driving shaft, and the wheels are driven to rotate through the driving shaft according to a preset program; the dynamometer is arranged on the lifting structure and can move up and down along with the lifting structure; the dynamometer moves up and down so as to adjust a horizontal plane where the driving shaft and the wheels are located to form a layout included angle a; the vibration sensor is arranged at the joint of the output end of the driving shaft and the wheel and is electrically connected with a computer of the testing device; the vibration sensor is used for collecting a vibration sensor signal in the torque output process of the driving shaft and transmitting the vibration sensor signal to the computer of the testing device; and the computer can calculate and form a vibration curve of the inner structure order of the universal joint according to the vibration signal and compare and analyze the vibration curve with a target curve, so that the optimal arrangement angle of the driving shaft is obtained.
Correspondingly, the invention also provides a vibration testing method for the driving shaft of the new energy electric vehicle, which is applied to the testing device; the method is characterized by comprising the following steps:
s1: the method comprises the following steps that wheels of the electric automobile are placed on rotating hubs respectively, a dynamometer is connected with the wheels of the electric automobile through a driving shaft, and a layout included angle a is formed between the driving shaft and a horizontal plane where the wheels are located; the dynamometer drives the wheels to rotate through a driving shaft according to a preset program;
s2: a vibration sensor at the joint of the output end of the driving shaft and the wheels collects vibration signals in the torque output process of the driving shaft and transmits the vibration signals to a computer of the testing device;
s3: and the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal and compares the vibration curve with a target curve so as to obtain the optimal arrangement angle of the driving shaft.
Further, in the step S3, when the tested vibration curve is different from the target curve, the height of the dynamometer is adjusted by adjusting the lifting structure on the supporting frame, so as to adjust the arrangement included angle a formed by the driving shaft and the horizontal plane where the wheels are located, and the vibration signal in the torque output process of the driving shaft is collected again and transmitted to the computer of the testing device, and the computer calculates and forms the vibration curve of the inner structure step of the universal joint according to the vibration signal and compares the vibration curve with the target curve until the optimal arrangement angle of the driving shaft is obtained.
By adopting the technical scheme, the influence of the arrangement angle of the driving shaft on the acceleration jitter of the whole vehicle can be verified in the early design verification stage of the pure electric vehicle, so that the problem of the acceleration jitter of the whole vehicle caused by the arrangement angle of the driving shaft can be avoided; according to the scheme provided by the invention, the testing device, the testing system and the testing method are simple and convenient to operate, the measuring accuracy is good, the design requirements of the current pure electric vehicle can be met, the performance of the pure electric vehicle is improved, and the development of new energy vehicles is promoted.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention will be further explained with reference to the drawings, in which:
fig. 1 is a schematic structural diagram of a vibration testing device for a new energy electric vehicle driving shaft according to the invention.
In the figure: 1. a wheel; 2. a dynamometer; 3. rotating the hub; 4. a support frame; 5. a load spring; 6. a drive shaft; 7. a vibration sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the invention provides a new energy electric vehicle drive shaft vibration testing device, which can be used for design testing of an existing new energy electric vehicle drive shaft; the testing device comprises a dynamometer 2, a rotating hub 3 and a supporting frame 4; the dynamometer 2 is fixedly arranged on the support frame 4 and is used for driving wheels to rotate; specifically, the dynamometer 2 is connected with wheels of the electric automobile through a driving shaft 6, and an arrangement included angle a is formed between the driving shaft 6 and a horizontal plane where the wheels are located, namely, an included angle exists in the connection process of the driving shaft 6 and the wheels 1, the included angle is the arrangement included angle of the driving shaft 6, and the arrangement included angle can be reasonably designed according to the vibration value of the electric automobile; further, the dynamometer 2 drives the wheels to rotate through the driving shaft according to a preset program; the method specifically comprises the following steps: in the testing process, the full-throttle acceleration torque output strategy of the pure electric vehicle is input to a controller of the dynamometer 2, the dynamometer 2 simulates the torque output of the whole vehicle according to the strategy, vibration testing equipment collects vibration signals in the torque output process, and after data collection is completed, the three directions of the slice curves x, y and z of the internal structure order of the universal joint tested in the group are analyzed and compared, and the slice curves are vibration curves; judging whether the arrangement included angle a is optimal or not according to the vibration conditions of the slicing curve and the target curve; the testing device provided by the invention can verify the influence of the arrangement angle of the driving shaft on the acceleration jitter of the whole automobile in the early design verification stage of the pure electric automobile, so that the problem of the acceleration jitter of the whole automobile caused by the arrangement angle of the driving shaft can be avoided.
Preferably, in combination with the above, as shown in fig. 1, the driving shaft includes a first driving shaft and a second driving shaft; one side of the dynamometer 2 is connected with one side of a first wheel of the electric automobile through a first driving shaft, and the other side of the dynamometer 2 is connected with one side of a second wheel of the electric automobile through a second driving shaft; the other side of the first wheel is connected to the support frame 4 through a load spring 5 and is positioned at one side of the dynamometer 2; the other side of the second wheel is connected to the support frame 4 through a load spring 5 and is positioned on the other side of the dynamometer 2, and the load spring 5 can adapt to rigidity adjustment to ensure that the load force is unchanged so as to reduce the arrangement angle of the driving shaft 6; the first wheel and the second wheel are respectively placed on the rotating hub 3 and are positioned on two sides of the dynamometer 2, so that the operation of the wheels on two actual sides of the pure electric automobile is simulated.
Preferably, in combination with the above solution, as shown in fig. 1, a vibration sensor 7 is provided at the connection between the output end of the driving shaft 6 and the wheel 1, and the vibration sensor 7 is electrically connected with the computer of the testing device; the vibration sensor 7 is used for collecting a vibration sensor signal in the driving shaft torque output process, transmitting the vibration sensor signal to a computer of the testing device, and obtaining a vibration curve through computer calculation and analysis; specifically, the vibration sensor 7 is used for acquiring vibration signals of the inner structure x, y and z of the universal joint at the output end of the driving shaft 6 respectively; the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal, and compares the vibration curve with a target curve for analysis, so that the optimal arrangement angle of the driving shaft 6 is obtained; the target curve is a reference curve pre-stored in the computer; the dynamometer 2 is input to a controller of the dynamometer 2 according to a full-accelerator acceleration torque output strategy of the electric automobile, and the dynamometer 2 simulates the torque output of the whole automobile through the full-accelerator acceleration torque output strategy by controlling the driving shaft 6, so that the running state of the pure electric automobile is accurately measured.
Preferably, in combination with the above scheme, as shown in fig. 1, a first vibration sensor is arranged at a connection between an output end of the first driving axle and the first wheel, the vibration sensor is electrically connected with a computer of the testing device, and the first vibration sensor is used for acquiring a vibration sensor signal in a torque output process of the first driving axle and transmitting the vibration sensor signal to the computer of the testing device; furthermore, a second vibration sensor is arranged at the joint of the output end of the second driving shaft and the second wheel and electrically connected with a computer of the testing device, and the second vibration sensor is used for acquiring vibration signals in the torque output process of the second driving shaft and transmitting the vibration signals to the computer of the testing device.
Preferably, in combination with the above solution, as shown in fig. 1, the supporting frame 4 is provided with a lifting structure, and the dynamometer 2 is arranged on the lifting structure and can move up and down along with the dynamometer 2 arranged on the lifting structure; the dynamometer 2 moves up and down to adjust an arrangement included angle a formed by a driving shaft and a horizontal plane where wheels are located; specifically, in the testing process, if the tested vibration curve is superior to the target vibration curve, the current driving shaft arrangement included angle a can be selected as the driving shaft arrangement angle of the vehicle type under study, if the tested vibration curve is different from the target vibration curve, the height of the left and right vertical supporting rods of the lifting structure is reduced, and meanwhile, the load spring 5 can adapt to the adjustment of rigidity to ensure that the load force is unchanged, so that the arrangement angle of the driving shaft 6 is reduced, the smaller the theoretical angle is, the smaller the additional bending moment is, and the more stable the power output is; in the testing process, repeatedly adjusting the height of the lifting structure until the optimal driving shaft arrangement angle a is obtained; specifically, the drive shaft adds a bending moment (taking a constant velocity joint as an example): the constant velocity universal joint is characterized in that the input and output torques at two ends are the same, and equal torque output can be realized; when the shafts at the two ends of the universal joint are not collinear (assuming that the included angle is a), additional bending moments T1 and T2 exist on the input shaft bell housing and the output shaft star sleeve, and the additional bending moments T1 and T2 are equal to each other, and the formula is as follows:
the T is universal joint input torque, and the formula shows that when the included angle of shafts at two ends of the universal joint is smaller (namely the arrangement angle of a driving shaft), the accessory bending moment is smaller, so that the excitation of front and rear support positions of the universal joint can be effectively reduced, the support stress condition is optimized, and the stable operation of a transmission system is facilitated.
Preferably, in combination with the above solution, as shown in fig. 1, the lifting structure of the supporting frame 4 includes a left supporting rod 41, a right supporting rod 42 and a connecting rod 43; the two ends of the connecting rod 43 are respectively arranged on the left supporting rod 41 and the right supporting rod 42 along the horizontal direction, and can move up and down along the vertical direction along with the left supporting rod 41 and the right supporting rod 42, so as to adjust the vertical height of the dynamometer 2.
Preferably, in combination with the above solution, as shown in fig. 1, the dynamometer 2 is fixedly connected to the connecting rod 43 through a fixing rod; one end of the wheel 1 is connected to the connecting rod 43 through the load spring 5, so that the load force of the wheel is ensured to be constant.
Correspondingly, in combination with the above scheme, as shown in fig. 1, the invention further provides a vibration testing system for a driving shaft of a new energy electric vehicle, which comprises a lifting structure, a dynamometer 2, a rotating hub 3 and a vibration sensor 7; the two sides of the dynamometer 2 are respectively connected with wheels 1 of the electric automobile through a driving shaft 6, and the wheels are driven to rotate through the driving shaft according to a preset program; further, the dynamometer 2 is arranged on the lifting structure and can move up and down along with the lifting structure; the dynamometer 2 moves up and down to adjust an arrangement included angle a formed by the driving shaft 6 and a horizontal plane where the wheels 1 are located; the vibration sensor 7 is arranged at the joint of the output end of the driving shaft 6 and the wheel 1, and the vibration sensor 7 is electrically connected with a computer of the testing device; the vibration sensor 7 is used for acquiring a vibration sensor signal in the torque output process of the driving shaft 6 and transmitting the vibration sensor signal to a computer of the testing device; and the computer can calculate and form a vibration curve of the inner structure order of the universal joint according to the vibration signal and compare and analyze the vibration curve with a target curve, so that the optimal arrangement angle a of the driving shaft is obtained.
Correspondingly, in combination with the above scheme, as shown in fig. 1, the invention further provides a vibration testing method for the driving shaft of the new energy electric vehicle, which is applied to the testing device; the method specifically comprises the following steps:
s1: the wheels of the electric automobile are respectively placed on the rotating hubs 3, the dynamometer 2 is connected with the wheels 1 of the electric automobile through the driving shaft 6, and the driving shaft 6 and the horizontal plane where the wheels 1 are located form an arrangement included angle a; the dynamometer 2 drives the wheels 1 to rotate through the driving shaft 6 according to a preset program;
s2: a vibration sensor 7 at the joint of the output end of the driving shaft 6 and the wheel 1 collects vibration signals in the torque output process of the driving shaft and transmits the vibration signals to a computer of the testing device;
s3: and the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal and compares the vibration curve with a target curve so as to obtain the optimal arrangement angle of the driving shaft.
Preferably, in combination with the above scheme, as shown in fig. 1, in step S3, when the tested vibration curve is different from the target curve, the height of the dynamometer 2 is adjusted by adjusting the lifting structure on the supporting frame 4, so as to adjust the arrangement included angle a formed by the driving shaft 6 and the horizontal plane where the wheel 1 is located, and the vibration signal in the torque output process of the driving shaft 6 is collected again and transmitted to the computer of the testing device, and the computer calculates the vibration curve of the inner structural step of the universal joint according to the vibration signal and compares the vibration curve with the target curve until the optimal arrangement angle of the driving shaft is obtained.
Specifically, in the above test process, if the tested vibration curve is superior to the target vibration curve, the current driving shaft arrangement included angle a can be selected as the driving shaft arrangement angle of the vehicle under study, and if the tested vibration curve is inferior to the target vibration curve, the height of the left and right vertical support rods of the lifting structure is reduced, and meanwhile, the load spring 5 can adapt to the adjustment of rigidity to ensure that the load force is unchanged, so that the arrangement angle of the driving shaft 6 is reduced, and the smaller the theoretical angle is, the smaller the additional bending moment is, the more stable the power output is; in the testing process, repeatedly adjusting the height of the lifting structure until the optimal driving shaft arrangement angle a is obtained; specifically, the drive shaft adds a bending moment (taking a constant velocity joint as an example): the constant velocity universal joint is characterized in that the input and output torques at two ends are the same, and equal torque output can be realized; when the shafts at the two ends of the universal joint are not collinear (assuming that the included angle is a), additional bending moments T1 and T2 exist on the input shaft bell housing and the output shaft star sleeve, and the additional bending moments T1 and T2 are equal to each other, and the formula is as follows:
the T is universal joint input torque, and the formula shows that when the included angle of shafts at two ends of the universal joint is smaller (namely the arrangement angle of a driving shaft), the accessory bending moment is smaller, so that the excitation of front and rear support positions of the universal joint can be effectively reduced, the support stress condition is optimized, and the stable operation of a transmission system is facilitated.
Preferably, in combination with the above solution, as shown in fig. 1, one side of the dynamometer 2 is connected with one side of the first wheel through the first driving shaft, and the other side of the dynamometer 2 is connected with one side of the second wheel through the second driving shaft; the other side of the first wheel is connected to the support frame 4 through a load spring 5 and is positioned at one side of the dynamometer 2; the other side of the second wheel is connected to the support frame 4 through a load spring 5 and is positioned on the other side of the dynamometer 2; the first wheel and the second wheel are respectively placed on the rotating hub 3 and are positioned on two sides of the dynamometer.
By adopting the technical scheme, the influence of the arrangement angle of the driving shaft on the acceleration jitter of the whole vehicle can be verified in the early design verification stage of the pure electric vehicle, so that the problem of the acceleration jitter of the whole vehicle caused by the arrangement angle of the driving shaft can be avoided; according to the scheme provided by the invention, the testing device, the testing system and the testing method are simple and convenient to operate, the measuring accuracy is good, the design requirements of the current pure electric vehicle can be met, the performance of the pure electric vehicle is improved, and the development of new energy vehicles is promoted.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (10)
1. A vibration testing device for a driving shaft of a new energy electric automobile is characterized by comprising a dynamometer (2), a rotating hub (3) and a supporting frame (4); the dynamometer (2) is fixedly arranged on the support frame (4), the dynamometer (2) is connected with wheels (1) of an electric automobile through a driving shaft, and an arrangement included angle a is formed between the driving shaft (6) and a horizontal plane where the wheels (1) are located; the dynamometer (2) drives the wheels to rotate through the driving shaft (6) according to a preset program.
2. The new energy electric vehicle drive shaft vibration testing device according to claim 1, characterized in that the drive shaft (6) comprises a first drive shaft and a second drive shaft; one side of the dynamometer (2) is connected with one side of a first wheel through the first driving shaft, and the other side of the dynamometer (2) is connected with one side of a second wheel through a second driving shaft; the other side of the first wheel is connected to the support frame (4) through a load spring (5) and is positioned on one side of the dynamometer (2); the other side of the second wheel is connected to the supporting frame (4) through a load spring (5) and is positioned on the other side of the dynamometer (2); the first wheel and the second wheel are respectively placed on the rotating hub (3) and are positioned on two sides of the dynamometer (2).
3. The new energy electric vehicle driving shaft vibration testing device is characterized in that a vibration sensor (7) is arranged at the joint of the output end of the driving shaft (6) and the wheel (1), and the vibration sensor (7) is electrically connected with a computer of the testing device; the vibration sensor (7) is used for collecting vibration sensor signals in the torque output process of the driving shaft (6) and transmitting the vibration sensor signals to a computer of the testing device.
4. The new energy electric vehicle driving shaft vibration testing device according to claim 3, characterized in that the vibration sensors (7) are respectively used for acquiring vibration signals of the internal structure x, y and z of the universal joint at the output end of the driving shaft (6); the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal, and compares the vibration curve with a target curve for analysis, so that the optimal arrangement angle of the driving shaft is obtained; the dynamometer (2) is input to a controller of the dynamometer according to a full-throttle acceleration torque output strategy of the electric automobile, and the dynamometer (2) simulates the torque output of the whole automobile through the full-throttle acceleration torque output strategy by controlling the driving shaft (6).
5. The new energy electric vehicle driving shaft vibration testing device according to claim 1, characterized in that a lifting structure is arranged on the supporting frame (4), and the dynamometer (2) is arranged on the lifting structure and can move up and down along with the dynamometer (2) arranged on the lifting structure; the dynamometer (2) moves up and down to adjust an arrangement included angle a formed by the driving shaft and a horizontal plane where the wheels are located.
6. The new energy electric vehicle driving shaft vibration testing device is characterized in that the lifting structure comprises a left supporting rod (41), a right supporting rod (42) and a connecting rod (43); the two ends of the connecting rod (43) are respectively arranged on the left supporting rod (41) and the right supporting rod (42) along the horizontal direction and can move up and down along the vertical direction along with the left supporting rod (41) and the right supporting rod (42).
7. The new energy electric vehicle driving shaft vibration testing device as claimed in claim 6, characterized in that the dynamometer (2) is fixedly connected to the connecting rod (43) through a fixing rod; one end of the wheel is connected to the connecting rod (43) through a load spring, so that the load force of the wheel is ensured to be constant.
8. A vibration testing system for a driving shaft of a new energy electric automobile is characterized by comprising a lifting structure, a dynamometer (2), a rotating hub (3) and a vibration sensor (7); two sides of the dynamometer (2) are respectively connected with wheels of the electric automobile through a driving shaft, and the wheels are driven to rotate through the driving shaft according to a preset program; the dynamometer (2) is arranged on the lifting structure and can move up and down along with the lifting structure; the dynamometer (2) moves up and down to adjust an arrangement included angle a formed by the driving shaft and a horizontal plane where the wheels are located; the vibration sensor (7) is arranged at the joint of the output end of the driving shaft (6) and the wheel (1), and the vibration sensor (7) is electrically connected with a computer of the testing device; the vibration sensor (7) is used for collecting a vibration sensor signal in the torque output process of the driving shaft (6) and transmitting the vibration sensor signal to a computer of the testing device; and the computer can calculate and form a vibration curve of the inner structure order of the universal joint according to the vibration signal and compare the vibration curve with a target curve for analysis, so that the optimal arrangement angle of the driving shaft is obtained.
9. A vibration testing method for a driving shaft of a new energy electric vehicle is applied to the testing device of any one of the claims 1 to 7; the method is characterized by comprising the following steps:
s1: the method comprises the following steps that wheels of an electric automobile are respectively placed on a rotating hub (3), a dynamometer (2) is connected with the wheels (1) of the electric automobile through a driving shaft (6), and an arrangement included angle a is formed between the driving shaft (6) and a horizontal plane where the wheels (1) are located; the dynamometer (2) drives the wheel (1) to rotate through the driving shaft (6) according to a preset program;
s2: the vibration sensor (7) at the joint of the output end of the driving shaft (6) and the wheel (1) collects vibration signals in the torque output process of the driving shaft (6) and transmits the vibration signals to the computer of the testing device;
s3: and the computer calculates and forms a vibration curve of the inner structure order of the universal joint according to the vibration signal and compares the vibration curve with a target curve so as to obtain the optimal arrangement angle of the driving shaft (6).
10. The new energy electric vehicle driving shaft vibration testing method according to claim 9, characterized in that in the step S3, when the tested vibration curve is different from a target curve, the height of the dynamometer (2) is adjusted by adjusting the lifting structure on the supporting frame (4) so as to adjust the arrangement included angle a formed by the driving shaft and the horizontal plane where the wheels are located, and the vibration signal in the torque output process of the driving shaft (6) is collected again and transmitted to the computer of the testing device, and the computer calculates a vibration curve of the inner structural order of the universal joint according to the vibration signal and compares the vibration curve with the target curve until the optimal arrangement angle of the driving shaft is obtained.
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