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Understanding Interfaces between Vehicle Systems
Published in Vivek D. Bhise, Automotive Product Development, 2017
1.An important trade-off is balancing the size of the mechanical subsystem components that interface with the driveline components. Large calipers, pads, and rotors that are specially designed to increase braking friction and improve heat reduction are critical to meeting brake performance objectives. The wheel hub, wheel, and suspension all need to be designed to incorporate these components to ensure that proper brake performance measurements are met. Larger brake system components (i.e., calipers, brake pads, and rotors) can increase unsprung weight, which can affect vehicle ride and handling performance.
Chassis systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
Unsprung mass (sometimes described as unsprung weight) is usually the mass of the suspension components, the wheels and the springs. However, only 50% of the spring mass and the moving suspension arms is included. This is because they form part of the link between the sprung and unsprung masses. It is beneficial to have the unsprung mass as small as possible in comparison with the sprung mass (main vehicle mass). This is so that when the vehicle hits a bump the movement of the suspension will have only a small effect on the main part of the vehicle. The overall result is therefore improved ride comfort.
Suspension systems
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
In more recent years advances made in spring manufacturing technology have resulted in the limited use of single-leaf springs (Figure 23.26). This type of construction is similar in principle to the previously mentioned simple plate spring, but it avoids the excessive width disadvantage by having its single leaf varying in both width and thickness. Advantages generally claimed for this simplified form of construction are the useful reduction in unsprung weight and the elimination of interleaf friction, both of which contribute to improved ride comfort of the vehicle.
Prognosis of uncertain linear time-invariant discrete systems using unknown input interval observer
Published in International Journal of Control, 2020
E. I. Robinson, J. Marzat, T. Raïssi
A passive suspension system is composed of springs that absorb the shocks by oscillating, and dampers that limit excessive suspension movement by reducing the oscillations of the springs. The suspension model that is used in this work is represented in Figure 1, and the corresponding mathematical model that describes the system dynamics was obtained from the Newton's second law: where and are the vertical displacements of sprung and unsprung weight, and are their respective mass. While , , and are the stiffness and damping coefficients of the suspension and tire respectively. Finally, denotes the irregular excitations from the road surface.
Dynamic behaviors of composite leaf springs with viscoelastic cores
Published in Mechanics Based Design of Structures and Machines, 2023
Saman Jolaiy, Armin Yousefi, Mahmoud Mousavi Mashhadi, Mohammadreza Amoozgar, Mahdi Bodaghi
The automobile industry has attempted to reduce the overall weight of automobiles continually. Composite components are a viable alternative to steel parts from a weight reduction point of view. Steel leaf spring is a potential item with relatively high weight which can be replaced by composite parts (Kumar and Vijayarangan 2007b; Rajesh et al. 2016) as steel leaf spring accounts for 10%–20% unsprung weight of the automobile. Because of the unique properties of fiber-reinforced polymer (FRP) leaf springs, such as high strength to weight ratio, excellent fatigue resistance, outstanding corrosion resistance, and high elastic strain energy ratio, they gained credibility in the industry (Rajendran and Vijayarangan 2001; Hou et al. 2007; Polach and Hajžman 2011).