On the Control of the Friction Force

Edge, K A; Ghigliazza, R.

doi:10.1023/b:mecc.0000046335.46797.ce

Cited by 8 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, when the friction acts in the same direction as the spring force and the mass velocity, the friction is switched off to avoid the addition of the forces and subsequently an increase in the net mass acceleration. An almost identical control strategy has been used by Stammers and Sireteanu [11] and Guglielmino et al (2004) [12]. Stammers and Sireteanu [11] applied different strategies for forced and free vibration of the system.…”

Section: Benchmark Single Degree Of Freedommentioning

confidence: 99%

See 1 more Smart Citation

A Friction Control Strategy for Shock Isolation

Ismail¹,

Ferguson²

2019

IJMEA

View full text Add to dashboard Cite

A control strategy is presented incorporating friction which can be adapted within a cycle of vibration. During base shock input, the friction is switched on and off based on specified response parameters. The predicted response of a semi active system is compared with that of a passive isolation system. The strategy is shown to produce an improved displacement reduction and a smaller maximum displacement compared to the base input; a result which cannot be obtained with a typical passive system. The models are then validated using an experimental rig, representing a two degree of freedom system, having an electromagnet to switch on and off friction via the control logic. Good agreement is obtained in addition to identifying optimum parameter choices.

show abstract

Section: Benchmark Single Degree Of Freedommentioning

confidence: 99%

“…Dash line: controlled system introduced in this paper. Dash dot line: controlled system widely published in the literature [11,12]. Nondimensional base input magnitude 10 , pulse length and non-dimensional friction .…”

Section: Benchmark System Responsementioning

confidence: 99%

A Friction Control Strategy for Shock Isolation

Ismail¹,

Ferguson²

2019

IJMEA

View full text Add to dashboard Cite

show abstract

“…Substituting equations (13) and (14) into equation (12), the dimensionless equation of motion is obtained as follows…”

Section: Dimensionless Equation Of Motionmentioning

confidence: 99%

“…Since Akbay and Aktan 9 proposed the first semi-active friction damper, various types of semiactive friction dampers have been researched. [10][11][12][13][14][15][16][17][18] All of these semi-active friction dampers are different to each other in terms of the actuator and control algorithm; however, the fundamental principle is the same; i.e. friction is controlled by varying the normal load between sliding surfaces.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and numerical studies of semi-active friction damper showing viscous-damper-like characteristics

Kado

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

To clarify the feasibility of a novel, semi-active friction damper, its damping characteristics were investigated theoretically and numerically. The proposed damper suppresses vibrations by changing the direction of the frictional force, in contrast to the conventional passive and semi-active friction dampers that only focus on the magnitude of the frictional force. The theoretical analysis indicates that the proposed damper can behave as a conventional friction damper or a viscous damper depending on the use conditions; further, its effective damping ratio can be controlled by the velocity of a friction plate moving in a direction orthogonal to the direction of the vibration. The numerical simulations clarified that damping characteristics can be controlled by the ratio of the amplitude of the excitation force to the frictional force. Finally, the design criteria of the proposed damper were derived.

show abstract

“…Even for nonlinear viscous dampers, approximate closed-form solutions for the optimal damper tuning exist (Main and Jones 2002). If a pure friction damper is used, investigations show that the friction force has to be adjusted in proportion to the damper displacement amplitude (Inaudi 1997, Guglielmino et al 2004, Boston et al 2009 in order to provide approximately amplitude independent damping to the cable and to avoid clamping (He et al 2003). Despite the amplitude proportional control of the friction force, the nonlinearity of the friction damper remains, and thereby leads to energy spillover from the excited mode to higher modes (Weber et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Energy based optimization of viscous–friction dampers on cables

Weber

Boston

2010

Smart Mater. Struct.

View full text Add to dashboard Cite

This investigation optimizes numerically a viscous-friction damper connected to a cable close to one cable anchor for fastest reduction of the total mechanical cable energy during a free vibration decay test. The optimization parameters are the viscous coefficient of the viscous part and the ratio between the friction force and displacement amplitude of the friction part of the transverse damper. Results demonstrate that an almost pure friction damper with negligibly small viscous damping generates fastest cable energy reduction over the entire decay. The ratio between the friction force and displacement amplitude of the optimal friction damper differs from that derived from the energy equivalent optimal viscous damper. The reason for this is that the nonlinearity of the friction damper causes energy spillover from the excited to higher modes of the order of 10%, i.e. cables with attached friction dampers vibrate at several frequencies. This explains why the energy equivalent approach does not yield the optimal friction damper. Analysis of the simulation data demonstrates that the optimally tuned friction damper dissipates the same energy per cycle as if each modal component of the cable were damped by its corresponding optimal linear viscous damper.

show abstract

On the Control of the Friction Force

Cited by 8 publications

References 11 publications

A Friction Control Strategy for Shock Isolation

A Friction Control Strategy for Shock Isolation

Theoretical and numerical studies of semi-active friction damper showing viscous-damper-like characteristics

Energy based optimization of viscous–friction dampers on cables

Contact Info

Product

Resources

About