Simulation design of multi-sensor technology smart tire based on SolidWorks software application
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With the increase in the number of cars, traffic accidents, traffic jams, and environmental pollution have become more and more serious. They have become global social hazards, and they have also become important issues that engineers and technicians in the automotive engineering industry urgently need to solve.
Tires are indispensable and important parts of automobiles. Relevant statistics show that about 6% of traffic accidents are caused by tires (see Figure 1). The recent investigation report of the French Michelin Group shows that. Twenty-five percent of commercial vehicle failures are caused by tires, and 85% of them are caused by chronic tire leaks. Statistics from the U.S. Transportation Management Department in 2010 also show that more than two-thirds of cars have different degrees of tire underpressure (see Figure 2). The temperature and pressure of tires have a great influence on the safety of new cars, and it is of great significance to monitor the pressure and temperature of tires.
To this end, the author adopts multi-sensing technology, RFID electronic tags and mechanical transmission theory, and uses SolidWorks as a modeling platform to design a smart tire that can overcome many limitations and realize the intelligentization of tires.
1 Design plan
Smart tires include three aspects: real-time detection of tire performance, tire information recording and identification, and tire pattern changes.
1.1 Real-time monitoring of tire performance
The traditional tire structure is shown in Figure 3. First of all, the author analyzed the working environment of automobile tires and made it clear that the designed tires need to adapt to the working environment with high strength, high strength and large temperature difference. Traditional tire pressure, temperature status, air leakage, and fatigue levels are unknown. Generally, the safety of tires is judged by sensory experience. Due to the uncertainty of experience, many traffic accidents have been caused. Therefore, it is hoped that the pressure and temperature of the tires can be monitored in real time by installing pressure and temperature sensors inside the tires (see Figure 4). The car reads relevant inspection data through RFID technology, and the driver can clearly understand the performance of each tire (see Figure 5).
Figure 3 Tire structure
Figure 4 The pressure sensor is installed inside the tire
Figure 5 Signal transmission inside the tire
Secondly, if you want to change the tire pattern, you need to understand the real-time friction factor of the road surface and the basic measurement principle of the friction factor: the running state of the wheel is detected by the sensor, and the control part of the single-chip microcomputer is required to analyze the relevant parameters such as wheel speed and slip rate. To get the friction factor (see Figure 6).
Figure 6 Flow chart of ground friction factor measurement
1.2 Record of tire information
Recording and transportation are based on the Internet of Things technology. The comprehensive performance parameters of tires are recorded in the built-in RFID memory, and each tire has a unique electronic tag. The information is read by the reader/writer on the vehicle or on the road, and relevant operations are performed based on the information.
Set up the corresponding sensors, RFID electronic tags, and single-chip control circuit. According to the special environment of the car, parts that can resist vibration, pressure and high temperature are used in chip selection and circuit design to ensure that the system can operate in a complex driving environment. Can be used normally.
1.3 Tyre pattern changing device
According to the work requirements of smart tires, the pattern control link is designed. Due to the high requirements and importance of automobile tires, a reliable mechanical control method is adopted to control the shape and depth of the tire pattern.
The rotation speed signal of the wheel at any time is obtained from the rotation speed sensor, which is installed near the sensing gear rotating with the wheel axle and aligned with the ring gear. The gear wheel rotates with the wheel, and the tooth tip and tooth gap of the ring gear alternately oppose the sensor, causing the magnetic field in the induction coil to periodically change, and an alternating voltage signal is generated in the coil. This signal is analyzed by the control part to obtain the wheel speed. The tension sensor measures the friction between the tire and the ground. It is installed at the connection between the tie rod and the auxiliary shaft. When working, it can accurately reflect the interaction force at the connection and send it to the control part.
Once the friction factor is obtained, the tire pattern shape and depth can be controlled by mechanical transmission. Realize the adaptive effect of tires on different roads.
2 Modeling and simulation based on SolidWorks
In terms of pattern control, SolidWorks is mainly used as a modeling platform to establish a three-dimensional simulation effect. Using this method of design can reduce design time, increase accuracy, and improve design innovation, which can meet the needs of modern design development.
2.1 Introduction to SolidWorks computer software
SolidWorks is a modeling-based 3D mechanical design software researched and developed by SolidWorks in the United States. The CAD/CAE/CAM integrated system with SolidWorks as the core fully meets the integration requirements of product design, analysis, manufacturing, and product data management. SolidWorks is a kind of engineering software based on Windows with powerful 3D modeling function and engineering drawing, IPA animation production, physical rendering and other functions. With the continuous improvement of SolidWorks version, continuous enhancement of performance and continuous improvement of functions, SolidWorks has fully met the requirements of modern enterprise mechanical design, and has been widely used in various industries of mechanical design and mechanical manufacturing.
2.2 Application and characteristics of SolidWorks software in mechanical design
In traditional design, the designer first produces a three-dimensional image in his mind when designing, and then uses projection and various additional rules and standards to “translate” the three-dimensional image in his mind and draw it on the drawing as a two-dimensional image. drawing. The generation of computer three-dimensional software, such as SolidWorks software, enables the three-dimensional solid image produced in the designer’s mind to be directly simulated on the computer screen. Both visual and intuitive. Therefore, the application of three-dimensional software for design enables the designer’s ideas to be displayed intuitively without “translation”. It is a natural thinking process for people and can make the expression of ideas more intuitive, accurate and clear.
3 concluding remarks
Smart tires can change the shape and depth of the pattern according to the road conditions to optimize vehicle driving, tire wear, and driving safety; sensors can implement feedback tire pressure and temperature information to reduce the occurrence of tire blowouts; RFID technology can make tires Internet of Things , To realize the unique identification of tires. For manufacturers, it can facilitate tire recalls, reduce losses, and enable tire manufacturers to establish a good reputation among consumers.
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