Noise measurement system for new energy tire

Abstract

The invention relates to the technical field of noise measurement systems, in particular to a noise measurement system for a new energy tire, which comprises a tire positioning and driving unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit and a man-machine interaction and display unit, the tire positioning and driving unit simulates different loads, different speeds and different road conditions of a tire by using a rack type tire positioning device, and drives the tire to rotate by using a brushless mute motor, so that a high-speed rotating effect without introducing extra mechanical noise is realized; the sensor unit is arranged on the two sides of the tire and at the position close to the ground through an acoustic sensor free field type condenser microphone array, is fixed to the suspension support through an acceleration sensor and is used for collecting vibration signals; the running states of the tire under different loads, speeds and road conditions are accurately simulated, noise data of the tire under various actual working conditions are obtained, and the measurement result is closer to the real situation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of noise measurement systems, in particular to a noise measurement system for new energy tires. BACKGROUND

[0002] With the increasing emphasis on environmental protection and sustainable development worldwide, the new energy vehicle industry has ushered in an unprecedented development opportunity, showing an explosive growth trend. As a key component of new energy vehicles, new energy tires have also received widespread attention and rapid development. In the process of rapid development of new energy tires, noise problems have gradually become a key factor restricting further improvement of quality and user experience. Tire noise not only affects the comfort of the driver and passengers in the vehicle, reducing the riding experience, but also may cause noise pollution to the external environment, affecting the quality of life of surrounding residents.

[0003] Currently, in the measurement of tire noise, such as the prior art with patent number CN206488931U, the utility model provides a tire noise testing device, relating to the technical field of tire noise testing, comprising a vehicle body, a traction part, a load, a soundproof cover and a noise detection device; the traction part is connected with the vehicle body, and the load is installed on the vehicle body; the vehicle body is provided with a mounting position for mounting a tire, and the soundproof cover is connected with the vehicle body and covers the mounting position, so that the tire on the mounting position is contained in the soundproof cover; the noise detection device for detecting the noise of the tire is installed in the soundproof cover. The technical problem of high testing cost of the drum method and the sliding method is solved, and the soundproof cover can isolate environmental noise during testing.

[0004] In the use of the existing system, it is found that the existing system has poor operation convenience and flexibility in measuring tire noise, and the weight adjustment of the vehicle body is relatively complex, which reduces the measurement efficiency. SUMMARY

[0005] To solve the above technical problems, the present application provides a noise measurement system for new energy tires, which can accurately simulate the running state of the tire under different load, speed and road conditions, obtain noise data of the tire under various actual working conditions, make the measurement results closer to the real situation, improve the flexibility and convenience of load and road condition adjustment of the tire, improve the measurement efficiency, obtain more comprehensive acoustic information, and avoid signal loss or distortion caused by single position collection.

[0006] The noise measurement system for new energy tires of the present application comprises a tire positioning and driving unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit and a man-machine interaction and display unit. The tire positioning and driving unit utilizes a bench-type tire positioning device to simulate different loads, speeds, and road conditions of the tire, and drives the tire to rotate by using a brushless silent motor, so as to realize high-speed rotation without introducing additional mechanical noise. The sensor unit utilizes an acoustic sensor free-field type condenser microphone array arranged on both sides of the tire and near the ground, and utilizes an acceleration sensor fixed to a suspension bracket to collect vibration signals, which can be used as auxiliary information to help identify noise sources and provide more comprehensive data support for subsequent noise analysis. The angular velocity and displacement change of the tire are collected by a speed sensor and a displacement sensor, so as to realize time alignment of the noise signal and the tire state and lay a foundation for subsequent data processing and analysis. The data acquisition and synchronization unit is used to receive the collected data of multiple sensors, and perform real-time filtering, dynamic gain control, and anti-aliasing processing on the collected data, so as to improve the data quality. Meanwhile, multi-channel high-speed A / D conversion and GPS / optical fiber synchronous timing are adopted to reduce the synchronization error between multiple sensors and ensure the high consistency of the collected data in time and space. The data processing unit utilizes a noise separation algorithm, combined with blind source separation, spectral subtraction, and a convolutional neural network denoising model, to accurately extract single tire noise components from complex signals. This processing process can effectively remove other interference factors and provide pure tire noise data for subsequent noise analysis. The data analysis unit analyzes the tire noise component data extracted by the data processing unit and outputs 1 / 3 octave spectrum, A-weighted sound pressure level, and rolling noise sound source positioning map. This unit supports cloud or local computing switching mode to meet the use requirements of different users. Meanwhile, it supports remote monitoring and data playback functions to facilitate users to view and analyze test data anytime and anywhere. The man-machine interaction and display unit utilizes a touch screen to display sound pressure level curve, spectrum, waterfall plot, and noise source positioning heat map in real time. Users can easily obtain various key data of tire noise through an intuitive graphical interface, which is convenient for real-time monitoring and operation. The bench-type tire positioning device is used to accurately simulate the running state of the tire under different loads, speeds, and road conditions, so as to obtain noise data of the tire under various actual working conditions, make the measurement results closer to the real situation, improve the flexibility and convenience of load and road condition adjustment of the tire, and improve the measurement efficiency. The free-field type condenser microphone array is arranged on both sides of the tire and near the ground to capture noise signals generated by the tire in all directions. By arranging microphone arrays at multiple positions, more comprehensive acoustic information can be obtained, and signal loss or distortion caused by single position collection can be avoided, so that the actual situation of tire noise can be more accurately reflected.

[0007] Preferably, the tire positioning and driving unit further comprises an environment simulation expansion module. The environmental simulation extension module achieves different measurement effects of tire noise by designing replaceable asphalt, concrete, and snow and ice road surfaces. It simulates driving environments in rainy, snowy, and hot weather by designing a spray and temperature and humidity control system. It also simulates the impact of high-altitude or low-pressure environments on noise by designing an adjustable pressure chamber. This further increases the diversity of tire environment simulation and improves measurement results.

[0008] Preferably, in the sensor unit, the microphone array is arranged in a semi-circular ring on the outside of the target tire, at a fixed distance of 0.2m to 0.3m from the tire tread. The array angle is kept parallel to the road surface to minimize airflow and road surface reflection interference and ensure the accuracy of acoustic signal acquisition.

[0009] Preferably, the benchtop tire positioning device includes a simulation device, a tensioning device, a first guide frame, a sliding seat, a mounting shaft, a first motor, and a first hydraulic cylinder. The sliding seat is slidably mounted on the first guide frame, the mounting shaft is rotatably mounted on the sliding seat, the tire is fixedly mounted on the front end of the mounting shaft, the first motor is mounted on the outer wall of the sliding seat, and the output end of the first motor is connected to the mounting shaft. The first hydraulic cylinder is mounted on the inner wall of the first guide frame, and the top end of the first hydraulic cylinder contacts the bottom of the sliding seat. The simulation device is located below the mounting shaft and is used to simulate different road surfaces. The tensioning device is connected to the sliding seat and is used to simulate different tire loads. When installing the tire, the first... A hydraulic cylinder supports the sliding seat to move upwards, then the tire is installed at the end of the mounting shaft. An acoustic sensor free-field capacitor microphone array is arranged around the tire. By controlling the downward extension and retraction of the moving end of the first hydraulic cylinder, the sliding seat moves downwards under gravity, thereby bringing the tire into contact with the simulation device. A tension device provides a downward tension to the sliding seat, thus simulating different tire load conditions. The first motor drives the mounting shaft to rotate, causing the mounting shaft to rotate the tire, thus simulating the tire's driving effect on the road surface. By adjusting the simulation device, it is easy to simulate different road surfaces and operating environments under different temperatures, improving the diversity of simulations and the convenience of adjustment operations.

[0010] Preferably, the simulation device comprises a moving device, a second guide frame, a slider, a cylinder, an annular cylinder, an electric heating pipe, an exhaust pipe and a conveying box, the second guide frame is installed on the moving device, the moving device is used for driving the second guide frame to move horizontally, two groups of sliders are installed on the second guide frame and slide up and down, a plurality of cylinders are connected with each other, two ends of the cylinders on the two sides are rotatably installed on the two groups of sliders, the right cylinder is provided with an exhaust hole, the annular cylinder is fixedly installed on the outer side wall of the slider and is rotatably connected with the right cylinder, the exhaust hole of the right cylinder is communicated with the annular cylinder, the electric heating pipe is installed on the inner side wall of the left cylinder, the exhaust pipe is installed on the slider and extends into the right cylinder, the conveying box is installed on the outer side wall of the slider and is communicated with the exhaust pipe, and the conveying box and the annular cylinder are communicated with external cooling equipment, and a plurality of road surface simulation layers are arranged on the outer side walls of the plurality of cylinders; the tire is supported by the plurality of cylinders, the cylinder is driven to rotate by friction when the tire rotates, the tire is in contact with different road surface simulation layers, so that different road surface environments are simulated, the left cylinder is heated by the electric heating pipe, so that the left cylinder heats one of the road surface simulation layers, so that the tire driving on a high-temperature road surface is simulated, the external cooling equipment sends cold air into the conveying box, so that the conveying box sends the cold air into the right cylinder through the exhaust pipe, so that the cold air circulates in the cylinder, so that the right cylinder cools one of the road surface simulation layers through heat conduction, so that the tire driving on a low-temperature road surface is simulated, and the middle cylinder is used to simulate the normal temperature environment, so that the effect of quickly switching the simulation under different temperatures is improved, and the diversity of the tire noise measurement is improved.

[0011] Preferably, the tension device comprises a supporting device, a support, a guide wheel, a traction rope, a hanging bracket and a counterweight, two groups of guide wheels are installed on the outer side walls of the support and the sliding seat respectively, the front end of the traction rope is connected with the bottom end of the sliding seat, the middle part of the traction rope is guided by the two groups of guide wheels, the rear end of the traction rope is connected with the top end of the hanging bracket, the lower part of the hanging bracket is inserted into a plurality of counterweights, corresponding insertion holes are arranged between the hanging bracket and the plurality of counterweights, the bolt is inserted into the insertion hole, the supporting device is arranged at the bottom of the plurality of counterweights, and the supporting device is used for supporting the plurality of counterweights; the bolt is inserted into the insertion hole in different positions, so that the bolt penetrates between the hanging bracket and one of the counterweights, when the supporting device stops supporting the counterweight, the counterweight provides downward tension to the hanging bracket, the hanging bracket drives the sliding seat to move downward through the traction rope, and the sliding seat simulates the weight of the tire, and the bolt is inserted into the counterweight in different positions, so that the hanging bracket lifts different amounts of counterweights, and different weight effects are simulated.

[0012] Preferably, the first telescopic rod and the second hydraulic cylinder are both mounted on the outer side wall of the second guide frame, the first telescopic rod and the second hydraulic cylinder are arranged at the bottom end of the base, the eccentric wheel is rotatably mounted on the outer side wall of the base, the sleeve set is rotatably sleeved on the outer side wall of the eccentric wheel, the second motor is mounted on the outer side wall of the base, and the output end of the second motor is connected with the rotating end of the eccentric wheel; the base is driven to move upwards by controlling the second hydraulic cylinder, so that the base drives the eccentric wheel to move upwards, thereby the top of the sleeve set contacts with the bottom of the cylinder body, the eccentric wheel is driven to rotate by the second motor, and the sleeve set is driven to reciprocatingly move up and down after the eccentric wheel rotates, thereby the sleeve set supports the cylinder body to reciprocatingly float up and down, the tire is supported to reciprocatingly float up and down, and thus the road surface undulating effect in the use process of the tire is simulated conveniently.

[0013] Preferably, the support device comprises a second telescopic rod, a third hydraulic cylinder, a bottom plate and a support plate, a plurality of groups of second telescopic rods and a plurality of groups of third hydraulic cylinders are both mounted on the bottom plate, the support plate is mounted on the moving end of the plurality of groups of second telescopic rods and the plurality of groups of third hydraulic cylinders, and a plurality of groups of counterweights are placed on the top end of the support plate; by controlling the telescopic length of the plurality of groups of third hydraulic cylinders, the support plate can support and adjust the plurality of groups of counterweights, and the convenience of simulating and adjusting the different loads of the tire is improved.

[0014] Preferably, the moving device comprises a guide seat and a fourth hydraulic cylinder, the second guide frame is slidingly mounted on the guide seat, the fourth hydraulic cylinder is mounted on the outer side wall of the guide seat, and the output end of the fourth hydraulic cylinder is connected with the second guide frame; the second guide frame is driven to slide horizontally by the fourth hydraulic cylinder, and the convenience of moving the different road surface simulation layers to the lower side of the tire is improved.

[0015] Preferably, the heat insulation layer is further arranged between the plurality of groups of road surface simulation layers; the heat insulation effect between the plurality of groups of road surface simulation layers is improved, and the convenience of simulating different temperatures by the different road surface simulation layers is improved.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows: by adopting the gantry type tire positioning device, the running state of the tire under different loads, speeds and road conditions is accurately simulated, the noise data of the tire under various actual working conditions is obtained, the measurement result is closer to the actual situation, the flexibility and convenience of load and road condition adjustment of the tire are improved, the measurement efficiency is improved, the free field type condenser microphone array is arranged on both sides of the tire and near the ground, the noise signals generated by the tire are captured in all directions, more comprehensive acoustic information is obtained by arranging the microphone array at multiple positions, signal loss or distortion caused by single position collection is avoided, and the actual situation of the tire noise is more accurately reflected. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a system structure schematic diagram of the present application; Figure 2 is a structural schematic diagram of a tire positioning and driving unit and an environment simulation extension module and the like; Figure 3 is a structural schematic diagram of a sensor unit and a data acquisition and synchronization unit and the like; Figure 4 is an axonometric structural schematic diagram of the connection of a support and a guide wheel and the like; Figure 5 is an axonometric local structural schematic diagram of the connection of a sliding seat and a first motor and the like; Figure 6 is an axonometric structural schematic diagram of the connection of a second guide frame and a guide seat and the like; Figure 7 is an axonometric local structural schematic diagram of the connection of a cylinder and a road surface simulation layer and the like; Figure 8 is an axonometric local structural schematic diagram of the connection of a cylinder and an electric heating pipe and the like; Figure 9 is an axonometric local structural schematic diagram of the connection of a traction rope and a hanger and the like; Figure 10 is an axonometric local structural schematic diagram of the connection of an eccentric wheel and a second motor and the like; Figure 11 is an axonometric structural schematic diagram of the connection of a first guide frame and a sliding seat and the like.

[0018] In the drawings, 101 is a first guide frame; 102 is a sliding seat; 103 is a mounting shaft; 104 is a first motor; 105 is a first hydraulic cylinder; 201 is a second guide frame; 202 is a sliding block; 203 is a cylinder; 204 is an annular cylinder; 206 is an electric heating pipe; 207 is an exhaust pipe; 208 is a conveying box; 209 is a road surface simulation layer; 301 is a support; 302 is a guide wheel; 303 is a traction rope; 304 is a hanger; 305 is a counterweight; 306 is a bolt; 401 is a first telescopic rod; 402 is a second hydraulic cylinder; 403 is a base; 404 is an eccentric wheel; 405 is a sleeve; 406 is a second motor; 501 is a second telescopic rod; 502 is a third hydraulic cylinder; 503 is a bottom plate; 504 is a support plate; 601 is a guide seat; 602 is a fourth hydraulic cylinder; 701 is a heat insulation layer. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Example 1

[0020] As Figures 1 to 11The application discloses a new energy tire noise measurement system, which comprises a tire positioning and driving unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit and a man-machine interaction and display unit. The tire positioning and driving unit utilizes a bench-type tire positioning device to simulate different loads, different speeds and different road conditions of the tire, and drives the tire to rotate by using a brushless silent motor, so that the high-speed rotation effect without introducing additional mechanical noise is realized. The sensor unit utilizes a free-field type capacitive microphone array of an acoustic sensor, is arranged at both sides of the tire and a position close to the ground, and is fixed to a suspension support by using an acceleration sensor, so as to collect vibration signals, the vibration signals can be used as auxiliary information to help identify noise sources, provide more comprehensive data support for subsequent noise analysis, and collect the angular velocity and displacement change of the tire by using a speed sensor and a displacement sensor, so that the time alignment of the noise signal and the tire state is realized, and a foundation for subsequent data processing and analysis is laid. The data acquisition and synchronization unit is used for receiving the collected data of the multiple sensors, and performing real-time filtering, dynamic gain control and anti-aliasing processing on the collected data, improving the data quality, and reducing the synchronization error between the multiple sensors by using multi-channel high-speed A / D conversion and GPS / optical fiber synchronous timing, and ensuring the high consistency of the collected data in time and space. The data processing unit utilizes a noise separation algorithm, combines blind source separation, spectral subtraction and a convolutional neural network denoising model, accurately extracts a single tire noise component from complex signals, and the processing process can effectively remove other interference factors, so as to provide pure tire noise data for subsequent noise analysis. The data analysis unit analyzes the tire noise component data extracted by the data processing unit, and outputs 1 / 3 octave spectrum, A-weighted sound pressure level and rolling noise sound source positioning map, supports cloud or local computing switching mode, meets the use requirements of different users, supports remote monitoring and data playback functions, and facilitates users to view and analyze test data at any time and any place. The man-machine interaction and display unit utilizes a touch screen to display sound pressure level curves, spectrum, water fall diagram and noise source positioning heat map, users can easily obtain key data of tire noise through an intuitive graphical interface, and real-time monitoring and operation are facilitated. The tire positioning and driving unit further comprises an environment simulation expansion module. The environment simulation expansion module realizes different measurement effects of tire noise by designing replaceable asphalt, concrete and ice and snow simulation road surfaces, simulates rainy, snowy and hot driving environments by designing a spraying and temperature and humidity control system, and simulates the influence of highland or low-pressure environment on noise by designing an adjustable air pressure cabin. In the sensor unit, the microphone array is arranged in a semi-circular ring form outside the target tire, with a fixed distance of 0.2m~0.3m from the tread, the array angle is parallel to the road surface, the airflow and road surface reflection interference are minimized, and the accuracy of acoustic signal acquisition is ensured. In the embodiment, by adopting the gantry type tire positioning device, the running state of the tire under different loads, speeds and road conditions is accurately simulated, the noise data of the tire under various actual working conditions is obtained, the measurement result is closer to the actual situation, the flexibility and convenience of load and road condition adjustment of the tire are improved, the measurement efficiency is improved, the free field type capacitive microphone array is arranged on both sides of the tire and near the ground position, the noise signals generated by the tire are captured in all directions, by arranging the microphone array at multiple positions, more comprehensive acoustic information is obtained, signal loss or distortion caused by single position acquisition is avoided, the actual situation of the tire noise is more accurately reflected, the diversity of tire environment simulation is further increased, and the measurement effect is improved. Embodiment 2

[0021] On the basis of embodiment 1, the noise measurement system of the new energy tire of the application, the gantry type tire positioning device comprises a simulation device, a tension device, a first guide frame 101, a sliding seat 102, an installation shaft 103, a first motor 104 and a first hydraulic cylinder 105, the sliding seat 102 is slid downwardly installed on the first guide frame 101, the installation shaft 103 is rotatably installed on the sliding seat 102, the tire is fixedly installed at the front end of the installation shaft 103, the first motor 104 is installed on the outer side wall of the sliding seat 102, the output end of the first motor 104 is connected with the installation shaft 103, the first hydraulic cylinder 105 is installed on the inner side wall of the first guide frame 101, the top end of the first hydraulic cylinder 105 is in contact with the bottom of the sliding seat 102, the simulation device is arranged below the installation shaft 103, the simulation device is used for simulating different road surfaces, the tension device is connected with the sliding seat 102, and the tension device is used for simulating different loads of the tire. The simulation device comprises a moving device, a second guide frame 201, sliders 202, barrels 203, an annular barrel 204, an electric heating pipe 206, an exhaust pipe 207 and a conveying box 208, the second guide frame 201 is installed on the moving device, the moving device is used for driving the second guide frame 201 to move horizontally, two groups of sliders 202 are installed on the second guide frame 201 in an up-down sliding mode, a plurality of barrels 203 are connected with each other, two ends of the barrels 203 on the right are rotatably installed on the two groups of sliders 202, the right barrel 203 is provided with an exhaust hole, the annular barrel 204 is fixedly installed on the outer sidewall of the slider 202, the annular barrel 204 is rotatably connected with the right barrel 203, the exhaust hole of the right barrel 203 is communicated with the annular barrel 204, the electric heating pipe 206 is installed on the inner sidewall of the left barrel 203, the exhaust pipe 207 is installed on the slider 202 and extends into the right barrel 203, the conveying box 208 is installed on the outer sidewall of the slider 202 and is communicated with the exhaust pipe 207, and the conveying box 208 and the annular barrel 204 are communicated with external cooling equipment, and a plurality of pavement simulation layers 209 are arranged on the outer sidewalls of the plurality of barrels 203 respectively. The first telescopic rod 401 and the second hydraulic cylinder 402 are both installed on the outer sidewall of the second guide frame 201, the first telescopic rod 401 and the second hydraulic cylinder 402 are arranged at the bottom end of the base 403, the eccentric wheel 404 is rotatably installed on the outer sidewall of the base 403, the sleeve 405 is rotatably sleeved on the outer sidewall of the eccentric wheel 404, the second motor 406 is installed on the outer sidewall of the base 403, and the output end of the second motor 406 is connected with the rotating end of the eccentric wheel 404. The support device comprises a second telescopic rod 501, a third hydraulic cylinder 502, a bottom plate 503 and a support plate 504, a plurality of second telescopic rods 501 and a plurality of third hydraulic cylinders 502 are both installed on the bottom plate 503, the support plate 504 is installed on the moving end of the plurality of second telescopic rods 501 and the plurality of third hydraulic cylinders 502, and a plurality of counterweight blocks 305 are placed on the top end of the support plate 504. The moving device comprises a guide seat 601 and a fourth hydraulic cylinder 602, the second guide frame 201 is slidably installed on the guide seat 601, and the fourth hydraulic cylinder 602 is installed on the outer sidewall of the guide seat 601 and connected with the second guide frame 201. The heat insulation layer 701 is further arranged between the plurality of pavement simulation layers 209. In the embodiment, when the tire is installed, the sliding seat 102 is supported by the first hydraulic cylinder 105 to move upward, then the tire is installed at the end of the installation shaft 103, and the acoustic sensor free field type condenser microphone array is arranged around the tire. By controlling the first hydraulic cylinder 105 to move the end to retract downward, the sliding seat 102 is moved downward by gravity, so that the tire is in contact with the simulation device, and the sliding seat 102 is provided with downward tension by the tension device, so as to simulate different load conditions of the tire. The installation shaft 103 is rotated by the first motor 104, so that the installation shaft 103 drives the tire to rotate, so as to simulate the driving effect of the tire on the road surface. By adjusting the simulation device, the use environment of different road surfaces and different temperatures is simulated, the diversity of simulation is improved, the convenience of transformation and adjustment operation is improved, the tire is supported by the plurality of cylinder bodies 203, the cylinder body 203 is rotated by friction when the tire rotates, the tire is in contact with different road surface simulation layers 209, so as to simulate different road surface environments, the left cylinder body 203 is heated by the electric heating pipe 206, so that the left cylinder body 203 heats one of the road surface simulation layers 209, so as to simulate the driving of the tire on the high-temperature road surface, the cold air is sent into the conveying box 208 by the external cooling equipment, the cold air is sent into the right cylinder body 203 by the exhaust pipe 207, the cold air circulates in the cylinder body 203, so that the right cylinder body 203 cools one of the road surface simulation layers 209 by heat conduction, so as to simulate the driving of the tire on the low-temperature road surface, and the middle cylinder body 203 is used to simulate the normal temperature environment, so as to improve the effect of rapid switching of the tire in different temperatures, and improve the diversity of tire noise measurement. Embodiment 3

[0022] On the basis of embodiment 2, a new energy tire noise measurement system of the application, the tension device comprises a supporting device, a support 301, a guide wheel 302, a traction rope 303, a hanger 304 and a counterweight 305, two groups of guide wheels 302 are respectively installed on the outer side walls of the support 301 and the sliding seat 102, the front end of the traction rope 303 is connected with the bottom end of the sliding seat 102, the middle part of the traction rope 303 is guided through the two groups of guide wheels 302, the rear end of the traction rope 303 is connected with the top end of the hanger 304, the lower part of the hanger 304 is inserted into a plurality of groups of counterweights 305, corresponding insertion holes are arranged between the hanger 304 and the plurality of groups of counterweights 305, the insertion hole is inserted into the insertion hole, the supporting device is arranged at the bottom of the plurality of groups of counterweights 305, and the supporting device is used for supporting the plurality of groups of counterweights 305; the plug 306 is inserted into the insertion hole in different positions, so that the plug 306 is inserted through between the hanger 304 and one of the counterweights 305, when the supporting device stops supporting the counterweight 305, the counterweight 305 provides downward tension to the hanger 304, the hanger 304 drives the sliding seat 102 to move downward through the traction rope 303, and the sliding seat 102 simulates the weight of the tire, by inserting the plug 306 into the counterweight 305 in different positions, so that the hanger 304 lifts different amounts of counterweights 305, and different weight effects are simulated.

[0023] The main functions realized by the application are: 1. By adopting the gantry type tire positioning device, the running state of the tire under different loads, speeds and road conditions is accurately simulated, the noise data of the tire under various actual working conditions is obtained, and the measurement result is closer to the real situation; 2. Improve the flexibility and convenience of the load and road condition adjustment of the tire, and improve the measurement efficiency; 3. The free-field type condenser microphone array is arranged on both sides of the tire and near the ground, and the noise signals generated by the tire are captured in all directions, so that more comprehensive acoustic information is obtained, and signal loss or distortion caused by single position collection is avoided.

[0024] The first motor 104, the first hydraulic cylinder 105, the electric heating pipe 206, the second hydraulic cylinder 402, the second motor 406, the third hydraulic cylinder 502 and the fourth hydraulic cylinder 602 of the new energy tire noise measurement system of the application are purchased on the market, and the technical personnel in the industry only need to install and operate according to the attached instruction manual, without the creative labor of the technical personnel in the field.

[0025] The above only describes the preferred embodiments of the application, and it should be noted that for ordinary technical personnel in the technical field, several improvements and modifications can be made without departing from the technical principles of the application, and these improvements and modifications should also be regarded as the protection scope of the application.

Claims

1. A noise measurement system for a new energy tire, characterized in that, It includes a tire positioning and drive unit, a sensor unit, a data acquisition and synchronization unit, a data processing unit, a data analysis unit, and a human-machine interaction and display unit; The tire alignment and drive unit utilizes a benchtop tire alignment device to simulate different tire loads, speeds, and road conditions. By using a brushless silent motor to drive the tire rotation, it achieves a high-speed rotation effect without introducing additional mechanical noise. The sensor unit utilizes an acoustic sensor free-field type capacitor microphone array, which is deployed on both sides of the tire and near the ground. An accelerometer is fixed to the suspension bracket to collect vibration signals. A speed sensor and a displacement sensor collect tire angular velocity and displacement changes to achieve time alignment between noise signals and tire status. The data acquisition and synchronization unit is used to receive data from multiple sensors and perform real-time filtering, dynamic gain control and anti-aliasing processing on the acquired data. At the same time, it adopts multi-channel high-speed A / D conversion and GPS / fiber synchronization timing to reduce synchronization errors between multiple sensors and ensure high consistency of the acquired data in time and space. The data processing unit uses noise separation algorithms, combined with blind source separation, spectral subtraction and convolutional neural network denoising models, to accurately extract single tire noise components from complex signals. The data analysis unit analyzes the tire noise component data extracted by the data processing unit and outputs 1 / 3 octave band spectrum, A-weighted sound pressure level, and rolling noise source location map. This unit supports switching between cloud and local computing modes to meet the needs of different users. It also supports remote monitoring and data playback functions, making it convenient for users to view and analyze test data anytime and anywhere. The human-computer interaction and display unit uses a touch screen to display various information in real time, including sound pressure level curves, spectrum, waterfall diagrams, and noise source location heat maps. Users can easily obtain key data on tire noise through an intuitive graphical interface.

2. The noise measurement system for a new energy tire as described in claim 1, characterized in that, The tire positioning and drive unit also includes an environmental simulation extension module; The environmental simulation extension module achieves different tire noise measurement effects by designing replaceable asphalt, concrete, and ice and snow simulated road surfaces. It simulates rainy, snowy, and hot driving environments by designing a spray and temperature and humidity control system. It also simulates the impact of high-altitude or low-pressure environments on noise by designing an adjustable pressure chamber.

3. The noise measurement system for a new energy tire as described in claim 1, characterized in that, In the sensor unit, the microphone array is arranged in a semi-circular ring on the outside of the target tire, at a fixed distance of 0.2m to 0.3m from the tire tread. The array angle is kept parallel to the road surface to minimize airflow and road surface reflection interference and ensure the accuracy of acoustic signal acquisition.

4. The noise measurement system for a new energy tire as described in claim 1, characterized in that, The benchtop tire positioning device includes a simulation device, a tensioning device, a first guide frame (101), a sliding seat (102), a mounting shaft (103), a first motor (104), and a first hydraulic cylinder (105). The sliding seat (102) is slidably mounted on the first guide frame (101), and the mounting shaft (103) is rotatably mounted on the sliding seat (102). The tire is fixedly mounted on the front end of the mounting shaft (103). The first motor (104) is mounted on the outer wall of the sliding seat (102), and the output end of the first motor (104) is connected to the mounting shaft (103). The first hydraulic cylinder (105) is mounted on the inner wall of the first guide frame (101), and the top end of the first hydraulic cylinder (105) contacts the bottom of the sliding seat (102). The simulation device is located below the mounting shaft (103) and is used to simulate different road surfaces. The tensioning device is connected to the sliding seat (102) and is used to simulate different tire loads.

5. The noise measurement system for a new energy tire as described in claim 4, characterized in that, The simulation device includes a moving device, a second guide frame (201), sliders (202), cylinders (203), annular cylinders (204), heating tubes (206), exhaust pipes (207), and a conveying box (208). The second guide frame (201) is mounted on the moving device, which drives the second guide frame (201) to move horizontally. Two sets of sliders (202) are slidably mounted on the second guide frame (201). Multiple sets of cylinders (203) are interconnected. The two ends of the cylinders (203) on both sides are rotatably mounted on the two sets of sliders (202). An exhaust hole is provided on the right cylinder (203). The annular cylinder (204) is fixed. The ring cylinder (204) is rotatably connected to the right cylinder (203) and the exhaust port of the right cylinder (203) is connected to the inside of the ring cylinder (204). The heating tube (206) is installed on the inner side wall of the left cylinder (203). The exhaust pipe (207) is installed on the slider (202) and extends into the right cylinder (203). The conveying box (208) is installed on the outer side wall of the slider (202) and is connected to the exhaust pipe (207). The conveying box (208) and the ring cylinder (204) are connected to the external cooling equipment. Multiple sets of road surface simulation layers (209) are respectively set on the outer side walls of multiple sets of cylinders (203).

6. The noise measurement system for a new energy tire as described in claim 4, characterized in that, The tensioning device includes a support device, a bracket (301), guide wheels (302), a traction rope (303), a hanger (304), and counterweights (305). Two sets of guide wheels (302) are respectively installed on the outer walls of the bracket (301) and the sliding seat (102). The front end of the traction rope (303) is connected to the bottom end of the sliding seat (102). The middle part of the traction rope (303) is guided by two sets of guide wheels (302). The rear end of the traction rope (303) is connected to the top end of the hanger (304). The lower part of the hanger (304) is inserted into multiple sets of counterweights (305). Corresponding insertion holes are provided between the hanger (304) and the multiple sets of counterweights (305). Pins (306) are inserted into the insertion holes. The support device is set at the bottom of the multiple sets of counterweights (305) and is used to support the multiple sets of counterweights (305).

7. The noise measurement system for a new energy tire as described in claim 5, characterized in that, It also includes a first telescopic rod (401), a second hydraulic cylinder (402), a base (403), an eccentric wheel (404), a kit (405), and a second motor (406). The first telescopic rod (401) and the second hydraulic cylinder (402) are both installed on the outer wall of the second guide frame (201). The first telescopic rod (401) and the second hydraulic cylinder (402) are set at the bottom of the base (403). The eccentric wheel (404) is rotatably installed on the outer wall of the base (403). The kit (405) is rotatably fitted on the outer wall of the eccentric wheel (404). The second motor (406) is installed on the outer wall of the base (403). The output end of the second motor (406) is connected to the rotating end of the eccentric wheel (404).

8. The noise measurement system for a new energy tire as described in claim 6, characterized in that, The support device includes a second telescopic rod (501), a third hydraulic cylinder (502), a base plate (503), and a support plate (504). Multiple sets of second telescopic rods (501) and multiple sets of third hydraulic cylinders (502) are installed on the base plate (503). The support plate (504) is installed on the moving ends of multiple sets of second telescopic rods (501) and multiple sets of third hydraulic cylinders (502). Multiple sets of counterweights (305) are placed on the top of the support plate (504).

9. The noise measurement system for a new energy tire as described in claim 5, characterized in that, The moving device includes a guide seat (601) and a fourth hydraulic cylinder (602). A second guide frame (201) is slidably mounted on the guide seat (601), and the fourth hydraulic cylinder (602) is mounted on the outer wall of the guide seat (601). The output end of the fourth hydraulic cylinder (602) is connected to the second guide frame (201).

10. The noise measurement system for a new energy tire as described in claim 5, characterized in that, It also includes a heat insulation layer (701), with multiple heat insulation layers (701) set between multiple road surface simulation layers (209).

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