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Running gear
Published in Andrew Livesey, Practical Motorsport Engineering, 2019
MacPherson strut suspension is a concentric arrangement of coil spring and damper unit, which is also the suspension upright member. It is used on many cars for both front and rear suspension. It allows for a large amount of suspension travel and can therefore provide a soft ride with a long stroke damper action. The mounting parts are well apart and so the load can be spread across the body/chassis components. This allows plenty of space between the struts for either an engine or luggage space; on the negative side a considerable height is needed to accommodate the struts – this constrains the vehicle height to a minimum figure. MacPherson strut suspension, which by its nature needs to be mounted with a small angle of inclination to the vertical, tends to give large amount of track width variation on bump or rebound. This creates a lateral force which is taken by the plunger arm such that it is susceptible to wear and may develop a coarseness in the steering. An anti-dive action is not usually incorporated.
Chassis
Published in Andrew Livesey, Advanced Motorsport Engineering, 2012
A MacPherson strut suspension is a concentric arrangement of coil spring and damper unit which is also the suspension upright member. It is used on many cars for both front and rear suspension. It allows for a large amount of suspension travel and can therefore provide a soft ride with a long stroke damper action. The mounting parts are well apart and so the load can be spread across the body/chassis components. This allows plenty of space between the struts for either an engine or luggage space, on the negative side a considerable height is needed to accommodate the struts, this constrains the vehicle height to a minimum figure. MacPherson strut suspension, which by its nature needs to be mounted with a small angle of inclination to the vertical, tends to give a large amount of track width variation on bump or rebound, this creates a lateral force which is taken by the plunger arm such that it is susceptible to wear and may develop a coarseness in the steering. An anti-dive action is not usually incorporated.
Road roughness estimation based on discrete Kalman filter with unknown input
Published in Vehicle System Dynamics, 2019
Sun-Woo Kang, Jung-Sik Kim, Gi-Woo Kim
The quarter-car model presented in Figure 3 has been widely used for the analysis of the vehicle vertical dynamics and the control of the suspension system in many researches. Although the actual suspension system has a very complex kinematic linkage structure (e.g. MacPherson strut suspension), this model can be successfully reduced the 2-D.O.F mass-spring-damper system [24]. The sprung mass (), which represents the vehicle body, is connected to the suspension system that consists of the suspension spring () and damper (). Additionally, this suspension system was linked by the unsprung mass () which represents the wheel with the tire. The tire with tire stiffness () contacts the road surface.
Self-steering performance of a new bogie with four independently rotating wheels using caster angle
Published in International Journal of Rail Transportation, 2023
Chao Yang, Ning Xu, Wenjing Wang, Wen Li, Zunsong Ren
The self-steering principle derives from the Macpherson strut suspension system in automobiles. As shown in Figure 1, the steering axis of the automobile is inclined relative to the vertical axis of the front wheel. The king pin inclination is beneficial to straighten the wheel with the help of gravity. The caster angle [18] makes contributions to the car steering by means of transverse forces. The spatial inclination which is backward and inward makes significant contributions to the stability and self-steering ability of automobiles [19].