Piezoelectric Suspension Research Articles

Stress-activated friction in sheared suspensions probed with piezoelectric nanoparticles.

A hallmark of concentrated suspensions is non-Newtonian behavior, whereby the viscosity increases dramatically once a characteristic shear rate or stress is exceeded. Such strong shear thickening is thought to originate from a network of frictional particle-particle contact forces, which forms under sufficiently large stress, evolves dynamically, and adapts to changing loads. While there is much evidence from simulations for the emergence of this network during shear thickening, experimental confirmation has been difficult. Here, we use suspensions of piezoelectric nanoparticles and exploit the strong local stress focusing within the network to activate charge generation. This charging can then be detected in the measured ac conductance and serve as a signature of frictional contact formation. The direct link between stress-activated frictional particle interactions and piezoelectric suspension response is further demonstrated by tracking the emergence of structural memory in the contact network under oscillatory shear and by showing how stress-activated friction can drive mechano-transduction of chemical reactions with nonlinear reaction kinetics. Taken together, this makes the ac conductance of piezoelectric suspensions a sensitive in-situ reporter of the micromechanics associated with frictional interactions.

Vibration isolation and damping using a piezoelectric flextensional suspension with a negative capacitance shunt

A suspension combining a piezoelectric component and a mechanical amplifier is studied in view to reducing vibration transmission over a wide frequency band. The principle and design of the piezoelectric suspension are approached using electromechanical and finite element models. The aim is to combine high damping at resonant frequency and high isolation at high frequency. The electromechanical coupling of the transducer allows implementing mechanical damping and electric damping with different shunts based on resistive and negative capacitance. The first design of the device is tested experimentally.

Design & Development of Multiple Alternative Energy Car

As a result of excessive air pollution caused from the vehicles the automobile industry is shifting its focus from traditional I.C. engine powered vehicle to electrically propelled vehicles. Although this shift is eco friendly when compared, it has its demerits too. Among these the range of an EV is preeminent. This research paper counters this downside of the EV by focusing on the depletion rate of the batteries, used to power the vehicle. Renewable energies like- Solar Energy & Wind Energy are used as the chief form of alternate energies by which power can be generated and connected with EV in order to help sustain and reduce the depletion rate of batteries. Along with these energies we can also use different technologies such as-Regenerative Braking, piezoelectric suspension system, etc. for reducing the depletion rate. These technologies can also be directly used for powering the secondary units such as headlights, horn, indicators, etc. This research paper revolves around this core idea and also to backhand this research we have fabricated a basic EV along with Solar & Wind module, namely the MAE-Car (Multiple Alternative Energy Car).

A high bandwidth piezoelectric suspension for high track density magnetic data storage devices

Maintaining the trend towards higher track densities and data rates in magnetic recording devices requires track following servo systems of increasing bandwidth for reliable storage and retrieval of data. The increase in bandwidth is limited by the presence of mechanical resonance modes and other nonlinearities in the voice coil motor (VCM) actuators. One approach to overcoming the problem is by using a dual-stage servo mechanism. In such a mechanism, a VCM is used as a primary stage while a microactuator is used as a secondary stage. The paper proposes a planar piezoelectric actuator design and a piezoelectric suspension made of the planar piezoelectric actuator. The design has a high bandwidth, simple structure and low cost. A prototype of the piezoelectric suspension is designed, fabricated and tested. The experimental results demonstrate that the piezoelectric suspension can satisfy the requirements for the dual-stage servo system.