Experimental Modal Study of Heavy-duty Tire Considering the Influence of Tire Inflated Pressure

Truck is an important tool for road transportation, and its safety has always been widely concerned by society; Tires are the only component in the contact between a car and the road, and the safety of high-speed driving is directly affected by their vibration characteristics; In generally speaking, the mechanical properties of tires have a crucial impact on the ride, handling stability, and safety of automobiles. At the same time, active and passive safety systems such as TCS, ABS, and ESC systems of automobiles are depended on the mechanical properties of tires. Taking the 12R22.5 heavy-duty tire as the research object, a multi-channel LMS vibration tester was used to conduct modal experiment on the tire through the testing method of free suspension, single-point input and multi-point vibration pickup (SIMO). The polyreference least squares complex frequency domain method (PolyMax) is used for modal parameter identification of the heavy-duty tires to explore the variation of tire modal parameters with inflation pressure and the influence of inflation pressure on the natural vibration mode of tires. The modal parameters involved in identification of the heavy-duty tires are the natural frequency and damping ratio of tires. The experimental results indicate that inflation pressure has a significant impact on the modal parameters of tires. As inflation pressure increases, each order natural frequency of tires increases; The tire damping ratio decreases with inflation pressure. The research content of this paper lays the foundation for the s safety of heavy-duty vehicles during high-speed driving, as well as the dynamic characteristics and modeling methods of tires.