Denny K. Miu

California Institute of Technology, Pasadena, California, United States

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Publications (18)20.88 Total impact

  • Shuyun Wu · Viktoria Temesvary · Yu-Chong Tai · Denny K. Miu
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    ABSTRACT: This paper presents results related to the design, fabrication and static/dynamic testing of a silicon micromachined integrated suspension system. This novel magnetic read/write head suspension with its built-in electrodes has been developed especially for automated assembly with miniaturized slider bearings. The one-piece construction silicon microgimbal and the polyimide-reinforced silicon load-beam are designed to have minimum profile, maximum pitch and roll compliances, maximum in-plane stiffness and maximum shock resistance, all of which are important operational requirements for the emerging small-form-factor magnetic recording rigid disk drive market.
    No preview · Article · Jul 1996 · Sensors and Actuators A Physical
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    ABSTRACT: It is projected that by the year 2001, the disk drive industry will be shipping products with track density on the order of 25,000 tracks-per-inch, which would require a servo bandwidth of at least 3 kHz. This paper presents initial fabrication results of an industry and government supported research project at Caltech and UCLA to develop piggyback electromagnetically driven microactuators for such applications, which are fabricated using the state-of-the-art silicon micromachining techniques
    No preview · Article · Dec 1995 · IEEE Transactions on Magnetics
  • Denny K. Miu · Yu-Chong Tai
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    ABSTRACT: Silicon micromachining technology will play an important role in the fabrication of high-bandwidth servo controlled microelectromechanical (mechatronic) components for super-compact disk drives. At the University of California, Los Angeles, and the California Institute of Technology, for the last three years, we have initiated a number of industry-supported joint research projects to develop the necessary technology building blocks for an integrated drive design of the future. These efforts include a silicon read/write head microgimbal with integrated electrical and mechanical interconnects, which targets the next-generation 30% form factor pico-sliders, and an electromagnetic piggyback microactuator in super-high-track-density applications, both of which utilize state-of-the-art silicon micromachining fabrication techniques
    No preview · Article · Jul 1995 · IEEE Transactions on Industrial Electronics
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    ABSTRACT: This paper documents results related to design optimization, fabrication process refinement, and micron-level static/dynamic testing of silicon micromachined microgimbals that have applications in super-compact computer disk drives as well as many other engineering applications of microstructures and microactuators requiring significant out-of-plane motions. The objective of the optimization effort is to increase the in-plane to out-of-plane stiffness ratio in order to maximize compliance and servo bandwidth and to increase the displacement to strain ratio to maximize the shock resistance of the microgimbals, while that of the process modification effort is to simplify in order to reduce manufacturing cost. The testing effort is to characterize both the static and dynamic performance using precision instrumentation in order to compare various prototype designs
    Preview · Article · Apr 1995 · Journal of Microelectromechanical Systems
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    Denny K. Miu · Yu-Chong Tai
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    ABSTRACT: Advances in VLSI and software technology have been the primary engines for the ongoing information revolution. But the steady stream of technical innovations in magnetic disk recording technology are also important factors contributing to the economic strengths of the computer and information industry. One important technology trend for the disk drive industry has been that of miniaturization. As this trend continues, future disk drives will have the same form factor as VLSIs, storing gigabytes of data. Silicon micromachining technology will play an important role in the fabrication of high-bandwidth servo-controlled microelectromechanical components for future super-compact disk drives. At UCLA and Caltech, for the past two years (1992-94) we have initiated a number of industry-supported joint research projects to develop microstructures and microactuators for future generation super compact magnetic recording rigid disk drives, including one to design and fabricate silicon read/write head microsuspensions with integrated electrical and mechanical interconnects, which target the next generation 30% form factor pico-sliders, and one for electromagnetic piggyback microactuators in super high-track-density applications, both of which utilize state-of-the-art silicon micromachining fabrication techniques.
    Preview · Conference Paper · Jan 1995
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    ABSTRACT: Surface micromachined out-of-plane permalloy actuator arrays are developed for controlling the rolling moment of a tail-less delta-wing. The actuator consists of a millimeter sized electroplated permalloy plate with supporting polysilicon beams and is driven by an external magnetic field. Large angular deflections and vertical deflections are demonstrated. The magnetic forces and flow loading involved in the flap operation is on the order of hundred's of μN. Wind-tunnel tests confirm that a rolling moment on the wing can be generated by the flap operation.
    Full-text · Conference Paper · Jan 1995
  • Denny K. Miu · Bingen Yang
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    ABSTRACT: In our previous work, it was shown that for simple control systems with mechanical flexibilities such as spring-mass systems or uniform cross-section linear elastic beams, the complex conjugate transfer function zeros can be interpreted as the resonances of a sub-portion of the flexible structure with additional constraints imposed by the sensor and actuator. In this paper, the aforementioned intuitive physical observation is verified mathematically for general lumped and distributed parameter flexible control systems with colocated sensor/actuator.
    No preview · Article · Mar 1994 · Journal of Dynamic Systems Measurement and Control
  • Denny K. Miu
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    ABSTRACT: In Part I, we have discussed various topics relevant to electromechanics which is the study of energy interaction between electrical and mechanical components. We demonstrated that the dynamics of complex electromechanical systems can be best understood by identifying the interaction between various energy storage and energy dissipation elements, some of which can be purely electrical (capacitance, inductance, resistance), some purely mechanical (compliance, inertia, damping), and some are in fact electromechanical (magnetic and piezoelectric coupling, etc.). In Part II, we shall discuss various topics related to contromechanics which is the study of energy interaction between control and electromechanical components. The purpose of control, as we have mentioned already, is to enhance the performance of the electromechanical systems.
    No preview · Chapter · Jan 1993
  • S.P. Bhat · D.K. Miu
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    ABSTRACT: An analytical procedure to implement optimal smoothing of the finite-time control waveform for point-to-point control problem is presented, which minimizes an optimality constraint consisting of a linear combination of the quadratic norms of its time derivatives. It is shown that the resulting control input is essentially the minimum norm solution augmented to satisfy some additional continuity requirements in the time domain. Application of the proposed technique to finite-time maneuvering of flexible structures is experimentally demonstrated and performances are compared using control torques evaluated based on different order of the smoothness constraint and order of the truncated plant model.
    No preview · Article · Sep 1992 · Journal of Dynamic Systems Measurement and Control
  • Denny K. Miu · Sudarshan P. Bhat
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    ABSTRACT: Analytical and experimental results dealing with power optimal control strategies for the point-to-point slewing of motor-driven flexible structures which would result in zero residual vibration are presented. Two optimality criteria to uniquely define the control input are discussed. An algebraic synthesis technique is introduced for composing the finite-time point-to-point control waveform. Experiments are performed on a laboratory flexible beam and a small disk drive. The results show that the Laplace domain synthesis technique is very effective in eliminating residual vibration in point-to-point positioning operations
    No preview · Article · Dec 1991 · IEEE Transactions on Magnetics
  • S. P. Bhat · M. Tanaka · D. K. Miu
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    ABSTRACT: When lightly damped flexible structures are used in high bandwidth applications, the elimination of residual vibration during point-to-point positioning is an important engineering problem. Using the Laplace domain synthesis technique introduced in earlier publications, experiments on the precise point-to-point position control of a flexible beam have been performed. In Part I of this two-part paper, results related to open-loop control are presented. A variety of candidate control functions are evaluated and performance issues related to robustness and sensitivity are investigated.
    No preview · Article · Sep 1991 · Journal of Dynamic Systems Measurement and Control
  • Sudarshan P. Bhat · Denny K. Miu
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    ABSTRACT: Using the Laplace domain synthesis technique documented in earlier publications, experiments on the closed-loop point-to-point position control of a flexible beam are presented. The approach presented here is basically an iterative open-loop control. Solution to the robustness problems encountered during actual implementation is also documented.
    No preview · Conference Paper · Jul 1991
  • Gou-Jen Wang · Denny K. Miu
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    ABSTRACT: Unsupervised adaptive control strategies based on neural-networks are presented. The tasks are performed by two independent networks which act as the plant identifier and the system controller. A new learning algorithm using information embedded in the identifier to modify the action of the controller has been developed. Simulation results are presented showing that this system can learn to stabilize a difficult benchmark control problem, the inverted pendulum, without requiring any external supervision.
    No preview · Conference Paper · Jul 1991
  • Sudarshan P. Bhat · Denny K. Miu
    [Show abstract] [Hide abstract]
    ABSTRACT: An analytical procedure to implement optimal smoothing of the finite-time control waveform for point-to-point control problem is presented, which minimizes an Optimality constraint consisting of a linear combination of the quadratic norms of its time derivatives. It is shown that the resulting control input is essentially the minimum norm solution augmented to satisfy some additional continuity requirements in the time domain. Application of the proposed technique to finite-time maneuvering of flexible structure is experimentally demonstrated and performances are compared using control torques evaluated based on different orders of the smoothness constraint and those of the truncated plant model.
    No preview · Conference Paper · Jul 1991
  • S. P. Bhat · D. K. Miu
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    ABSTRACT: Control strategies to accomplish precise point-to-point positioning of flexible structures are discussed. First, the problem is formulated and solved in closed form using a linear quadratic optimal control technique for a simple system with only one rigid and one flexible mode; the resulting analytical solutions are examined in both the time and frequency domain. In addition, the necessary and sufficient condition for zero residual vibration is derived which simply states that the Laplace transform of the time bounded control input must vanish at the system poles. This criteria is then used to highlight the common features of existing techniques and to outline an alternative design procedure for precise position control of more complicated structures having multiple flexible modes.
    No preview · Article · Dec 1990 · Journal of Dynamic Systems Measurement and Control
  • Sudarshan P. Bhat · Denny K. Miu
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    ABSTRACT: Using finite-time Laplace transform, the governing differential equations of linear, time invariant point-to-point control problems are converted into an equivalent set of linear algebraic equations embedded with the desired boundary conditions, characterizing the entire set of optimal and sub-optimal solutions. A linear programming technique for synthesizing the control inputs using selected sets of basis functions is presented. A new concept of feedback control which involves a recursive evaluation of the open-loop input is also developed.
    No preview · Conference Paper · Jun 1990
  • G.-J. Wang · Denny K. Miu
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    ABSTRACT: Unsupervising learning control systems based on neural networks are discussed. The tasks are carried out by two neural networks which act as the plant identifier and system controller, respectively. A novel learning algorithm that can adapt the controller's control action by using information stores in the identifying network has been developed. This learning control system can learn without supervising to perform the dynamic control of a difficult-learning control problem such as the inverted pendulum. Robustness can be seen from its ability to adapt large parameter changes and from its high fault tolerance. Simulation results are encouraging
    No preview · Article · Jan 1990
  • D.K. Miu · S. Wu · V. Temesvary · Y.-C. Tai

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