Vibration analysis and pull-in instability behavior in a multiwalled piezoelectric nanosensor with fluid flow...

Area of Science:

• Nanoscience and Nanotechnology
• Materials Science
• Mechanical Engineering

Background:

• Fluid-conveying multiwalled piezoelectric nanosensors (FC-MWPENSs) are vital for sensing applications.
• Surface and interface effects significantly influence the behavior of nanoscaled devices.
• Understanding these effects is critical for accurate performance prediction and design.

Purpose of the Study:

• To investigate the impact of surface/interface effects on the pull-in voltage and natural frequency of FC-MWPENSs.
• To analyze the influence of viscous fluid velocity on the dimensionless natural frequency.
• To examine the role of nonlinear van der Waals and electrostatic forces in the nanosensor's behavior.

Main Methods:

• Utilized Gurtin-Murdoch surface/interface theory for nanosensor analysis.
• Employed Hamilton's principle to derive governing and boundary conditions.
• Applied the assumed mode method to convert partial differential equations into ordinary differential equations.

Main Results:

• Quantified the influence of surface/interface parameters (Lame's constants, residual stress, piezoelectric constants, mass density) on natural frequency.
• Demonstrated the relationship between viscous fluid velocity, pull-in voltage, and the dimensionless natural frequency.
• Highlighted the significance of surface effects in the dynamic response of FC-MWPENSs.

Conclusions:

• Surface/interface effects are critical determinants of the dynamic characteristics of FC-MWPENSs.
• Fluid velocity and pull-in voltage significantly alter the natural frequency, necessitating careful consideration in sensor design.
• The study provides a theoretical framework for optimizing FC-MWPENS performance by accounting for nanoscale phenomena.