Design of optimized piezoelectric HDD-sliders

Paulo H. Nakasone; Jeonghoon Yoo; Emilio C. N. Silva

doi:10.1117/12.847668

9 April 2010 Design of optimized piezoelectric HDD-sliders

Paulo H. Nakasone, Jeonghoon Yoo, Emilio C. N. Silva

Proceedings Volume 7643, Active and Passive Smart Structures and Integrated Systems 2010; 76431L (2010) https://doi.org/10.1117/12.847668
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

As storage data density in hard-disk drives (HDDs) increases for constant or miniaturizing sizes, precision positioning of HDD heads becomes a more relevant issue to ensure enormous amounts of data to be properly written and read. Since the traditional single-stage voice coil motor (VCM) cannot satisfy the positioning requirement of high-density tracks per inch (TPI) HDDs, dual-stage servo systems have been proposed to overcome this matter, by using VCMs to coarsely move the HDD head while piezoelectric actuators provides fine and fast positioning. Thus, the aim of this work is to apply topology optimization method (TOM) to design novel piezoelectric HDD heads, by finding optimal placement of base-plate and piezoelectric material to high precision positioning HDD heads. Topology optimization method is a structural optimization technique that combines the finite element method (FEM) with optimization algorithms. The laminated finite element employs the MITC (mixed interpolation of tensorial components) formulation to provide accurate and reliable results. The topology optimization uses a rational approximation of material properties to vary the material properties between 'void' and 'filled' portions. The design problem consists in generating optimal structures that provide maximal displacements, appropriate structural stiffness and resonance phenomena avoidance. The requirements are achieved by applying formulations to maximize displacements, minimize structural compliance and maximize resonance frequencies. This paper presents the implementation of the algorithms and show results to confirm the feasibility of this approach.

Citation Download Citation

Paulo H. Nakasone, Jeonghoon Yoo, and Emilio C. N. Silva "Design of optimized piezoelectric HDD-sliders", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76431L (9 April 2010); https://doi.org/10.1117/12.847668

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KEYWORDS

Optimization (mathematics)

Head

Actuators

Chemical elements

Finite element methods

Data storage

Polarization

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