Effect of Particle Material, Size and Filling Percentage on Particle Damping Phenomenon for Gear Transmission System

Particle damping is a passive vibration control technology. At the present stage, particle damping technology is developing especially in machinery and aerospace fields. For studying the particle damping effect different parameters such as particle material, size and filling percentage is used. One of the applications for particle damping phenomenon is gear transmission system. For simulation of particle damping discrete element method (DEM) software is used. The simulation results have been validated by comparing with experimental results of a physical system. Find damping effect due to particle damping from simulation and experimentation.

Active-Passive Vibration Control for Fans in the Data Server

The work presented in this paper aims at developing a vibration control system for fans in data server. The methods used in the work includes numerical, experimental, and analytical approaches with goal placed on developing a mechatronic system that can be used in the data server to reduce structural-born vibrations affecting data access performance in hard disk drives (HDD). It was observed that with the proposed method and system, vibrations of the server structure, the chassis, can be significantly reduced by 88%, which also enhanced the disk drive data access performance.

On the concept of embedded resonators for passive vibration control of tyres

An investigation is carried out on structure-borne vibrations of tyre models at low frequencies. The idea is to use embedded resonant meta-materials to damp the tyres’ vibrations and thus reduce the transferred energy to the main attached structures. A simplified tyre model is used, being the investigation of the effects of the embedded substructures the main target of the work; internal pressure and tyre rotation effects are neglected at this stage. Different configurations are tested targeting different natural modes of the tyre, while mechanical excitation is assumed on one section of the tyres. The results show how the proposed designs open new possible and feasible solutions for the vibration control.

Self-Reinforced Nylon 6 Composite for Smart Vibration Damping

Passive vibration control using polymer composites has been extensively investigated by the engineering community. In this paper, a new kind of vibration dampening polymer composite was developed where oriented nylon 6 fibres were used as the reinforcement, and 3D printed unoriented nylon 6 was used as the matrix material. The shape of the reinforcing fibres was modified to a coiled structure which transformed the fibres into a smart thermoresponsive actuator. This novel self-reinforced composite was of high mechanical robustness and its efficacy was demonstrated as an active dampening system for oscillatory vibration of a heated vibrating system. The blocking force generated within the reinforcing coiled actuator was responsible for dissipating vibration energy and increase the magnitude of the damping factor compared to samples made of non-reinforced nylon 6. Further study shows that the appropriate annealing of coiled actuators provides an enhanced dampening capability to the composite structure. The extent of crystallinity of the reinforcing actuators is found to directly influence the vibration dampening capacity.

Modeling and Control of Torsional Vibration in Rotating System Using Dual Loop Controllers

A torsional rotating system is considered for the investigation of passive vibration control using dual loop controllers Proportional-Integral-Derivative (PID) with derivative (D) gain and Proportional – Derivative (PD) with Integral (I) controllers. The controllers are used as low pass filters. Simulation of the models using Matlab-Simulink have been built in this work for torsional vibration control. A comparison between the two controllers with uncontrolled system have been carried out. Results show that the PD – I control is the best method which gives better stability response than the PID – D control.