This paper describes a semi-active vibration absorber (SVA) concept based on a real-time controlled magnetorheological damper (MR-SVA) for the enhanced mitigation of structural vibrations due to harmonic disturbing forces. The force of the MR damper is controlled in real-time to generate the frequency and damping controls according to the behaviour of the undamped vibration absorber for the act...

Abstract A crawler system provides much larger ground contact, leading to excellent terrain adaptability. Due its structural characteristics, high‐frequency vibration proportional the vehicle speed is generated during driving process. This a result of polygon and rolling effects between track wheels. field test tracked performed monitor movement signals chassis rocker arm. Their corresponding p...

This study presents a new approach to control the nonlinear dynamics of an adaptive absorber using shape memory alloy (SMA) element. Shape memory alloys are classified as smart materials that can remember their original shape after deformation. Stress and temperature-induced phase transformations are two typical behaviors of shape memory alloys. Changing the stiffness associated with phase tran...

Magnetorheological (MR) materials and shear thickening fluids are both smart material and their combination could offer both MR and ST effects. This study looks at the properties and behaviour of magnetorheological shear thickening fluid (MRSTF) in particular whilst applied as a semi-active energy absorber. A device with two forms of varying vibration control has been created and measured. The ...

This paper deals with the application of a linear dynamic vibration absorber (DVA) to a piecewise linear beam system to suppress its first harmonic resonance. Both the undamped and the damped DVAs are considered. Results of experiments and simulations are presented and show good resemblance. It appears that the undamped DVA is able to suppress the harmonic resonance, while simultaneously many s...

Vibrations in the aircraft assembly building will affect precision of robotic drilling system. A variable stiffness and damping semiactive vibration control mechanism with quasi-zero characteristics is developed. The realized by parallel connection four vertically arranged bearing springs two symmetrical horizontally negative elements. Firstly, parameters at static equilibrium position are obta...

Residual vibrations in machine tools hamper accuracy and productivity. The attenuation of residual has been an industrial concern for decades. Meanwhile, the vibrations' vibration pattern reveals that support foundation's damping capabilities predominantly influence them. Therefore, inserting dampers any other location on a tool (such as column) is ineffective. Hence, scope damper into foundati...