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Running gear and braking
Published in Andrew Livesey, Motorcycle Engineering, 2021
The purpose of the shock absorber is to dampen the spring action and reaction. The shock absorber stops the motorcycle from bouncing each time it hits a bump in the road. There are two types of shock absorbers – these are telescopic and lever arm – and they are easily identified by their shape and mountings. On vintage machines friction dampers were used. These are formed by tightening two moving plates together. The suspension movement has to overcome the friction between the two parts. Between the two parts is a large brass watcher to prevent wear.
Hydraulic Power Regulation
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
A hydraulic shock absorber is a hydraulic device that absorbs the kinetic energy carried by the impact-induced pressure waves. A typical shock absorber works in such a way that it first converts the kinetic energy into a heat form by forcing the pressurized flow to flow through an orifice and then dissipates the generated heat from the system. The energy transformation occurs as the fluid is forced through orifices at high velocities. A hydraulic fluid spring can be treated as a special type of shock absorber and is designed to provide a controlled soft stop to the piston to avoid jerky operations caused by sudden stops by applying extra resistance induced during the hydraulic energy absorption. It works in such a way that when an external force is applied to the device, it compresses the contained fluid to absorb and store the energy in the form of higher pressure, which will then develop an extra resistance in proportion to the stroke of the piston to slow down its motion. The amount of stored energy will be gradually released through the carefully designed orifices over time.
Suspension and Steering
Published in Andrew Livesey, Basic Motorsport Engineering, 2012
The purpose of the shock absorber is to dampen the spring action and reaction. The shock absorber stops the vehicle from bouncing each time it hits a bump in the road. There are two types of shock absorbers, these are telescopic and lever arm and they are easily identified by their shape and mountings.
Valve control of a hydraulically interconnected suspension system to improve vehicle handling qualities
Published in Vehicle System Dynamics, 2023
Behnam Jafari, Behrooz Mashadi
An interconnected suspension is one in which motion at one wheel station can produce forces at other wheel stations [1]. This is achieved by connecting the spring-damper elements in different stations to one another either hydraulically or mechanically. Interconnected systems have the theoretical capability of controlling the stiffness and damping of each suspension mode. This, however, depends on the arrangement of the interconnection system and its control method. Hydraulically interconnected suspension (HIS) systems typically contain a hydraulic cylinder at each wheel station, replacing the conventional shock absorber. A passive HIS has proved to be extremely resistant to handling manoeuvres and possesses intrinsic stability due to its ability to maintain lower and more stable roll characteristics [2].
LMI-based designs for robust state and output derivative feedback guaranteed cost controllers in reciprocal state space form
Published in International Journal of Control, 2021
Here, is the driver+seat mass and is the car mass. and are stiffness and damping elements of shock absorber, respectively. and are stiffness and damping elements of active seat suspension, respectively. Vibration attenuation performance can be improved by applying control inputs and . In Reithmeier and Leitmann (2003), it is assumed that accelerometers are used to measure and . The velocities and are estimated from acceleration signals. Therefore, derivative feedback controllers can be used.
Study on dynamic characteristic analysis of vehicle shock absorbers based on bidirectional fluid–solid coupling
Published in Engineering Applications of Computational Fluid Mechanics, 2021
Qiping Chen, Zhihui Xu, Mingming Wu, Yuan Xiao, Hao Shao
This is similar to the calculation of the damping coefficient of the recovery stroke, and the damping coefficient of the compression stroke can be calculated by formula (9): where is the area of the indicator characteristics chart of the compression stroke, and = 0.040 , so the calculated damping coefficient of the compression stroke is 0.615 . The damping coefficient of the recovery stroke is about 5.25 times greater than the damping coefficient of the compression stroke for the shock absorber. The damping force of the shock absorber is related to the damping coefficient. The greater the damping coefficient, the greater the damping force. Therefore, it can be seen from Figure 16 that the damping force of the recovery stroke is much greater than the damping force of the compression stroke, and the damping force of the recovery stroke is about six times the damping force of the compression stroke.