Search Results

Easy-to-use tire models for vehicle dynamics analysis have been studied at various institutions. This paper presents a tire model consisting of theoretical and experimental equations representing the experimental characteristics of tires, by employing relatively simple theoretical equations (1), (2), (3) and (4)*, obtaining their coefficients through experiments, and adding further corrections. As a result, we have obtained a model representing the change of forces and moment generating in the tire, which are caused by slip angle, slip ratio, camber angle and load. This model has many advantages including easy correspondence to physical phenomena, higher possibilities of practical development and a possibility of rational correction of the errors during experiments.

As the progress is made in vehicle dynamics analysis, tire models for vehicle dynamics analysis that are broadly applicable have been increasingly sought. Therefore, following the previous paper, the method to formulate a tire model consisting of theoretical and experimental equations, that represents, with high accuracy, the experimental characteristics of a tire, based on relatively simple theoretical equations - by obtaining the coefficients through experiments and further adding to them appropriate collections - is investigated in this paper. In the previous paper, the procedure to formulate a model that shows the changes in lateral force, driving-braking force and aligning moment, generated on a tire running at a constant velocity, due to slip angle, slip ratio, camber angle and load was presented. However, the change due to velocity was not taken into consideration.

This report deals with the tests made on the hydroplaning phenomenon of car, truck and bus tires using the interior of a dynamic tire testing machine. For car tires, the relationship between braking force and slip ratio and between cornering force and slip angle as affected by hydroplaning were investigated. Studies were also made of the influence of the difference between radial-ply and cross-ply tires, inner pressure, load, thickness of the water film, etc.. Next, a study was conducted concerning the effect of hydroplaning on the cornering properties of truck and bus tires.

The cornering properties of tires while a vehicle is traveling generate a curve different from those in steady state derived from prevailing tire-testing devices. The objective of this paper is to clarify the cornering properties in order to simulate vehicular motions and to make the results applied to practical use. This paper presents experimental data on steady-state tire cornering properties at slip angles of 0 to 90 degrees and on transient tire cornering properties up to relatively large slip angles. This research deals with transient tire cornering properties at slip angles of 0 to 90 degrees.

Dynamic properties of motorcycles are, to a great extent, governed by motorcycle tire properties. In this study, the influences of various factors such as, internal pressure, load, tire make, width, etc., on tire dynamic properties are clarified through the experiments carried out on laboratory testing machines. It was found that tire dynamic properties are significantly influenced by these factors, and the experiments yielded some beneficial data for the improvement of motorcycle dynamic properties as well as tire dynamic properties.

A tire vibration model which helps to clarify a vibration characteristics of radial tire in affecting vehicle ride quality and road noise is studied. The model is based on cylindrical beam on an elastic foundation, and cylindrical beam is characterized by bending stiffness, tension force and mass of tread band with breaker. Elastic foundation correspond to radial and tangential direction stiffness of side wall. The natural frequencies under inflation pressure are determined analytically by using of this model, further, measurement techniques of fundamental values in the model are examined and experimented. It is found that the analytical natural frequencies of radial tire agree well with the corresponding experimental results in a wide range of inflation pressure. Finally, an effect of foundamental values of tire on natural frequencies is discussed.