Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"stiction"”.
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Factors contributing to stiction in high performance disk drives
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Mode I and Mode II Measurements For Stiction Failed Micro-Electro-Mechanical Systems
… (MEMS), the most common type of failure is stiction. Stiction is the unintended adhesion between two surfaces when they are in close proximity to each other. Various studies have been conducted in recent years to study stiction. Our research group has shown the in-service repair of the …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
… NanoElectroMechanical Systems (NEMS) - a.k.a. stiction-failure. The adhesive forces between MEMS devices leading to stiction failure are characterized in this dissertation analytically and experimentally. Specifically, the adhesion energy of poly-Si μcantilevers are determined experimentally …
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Modelling tribology of slider and disk in a computer hard drive system
… loss and allow higher areal density. Friction, stiction and wear between the slider and disk in a hard drive were studied using Accelerated Friction Test (AFT) apparatus. Contact Start Stop (CSS) and constant speed drag tests were performed using commercial rigid disks and two different air …
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Performance assessment of multivariate control systems
… plant performance are bad controller tuning and stiction in control valves. Concerning the former problem, most process controls in industrial environments use a proportional-integral (PI) algorithm. There exists a large body of literature on PI controller diagnosis and retuning, and one aim of …
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Design and Optimization of Tunneling Nanoelectromechanical Switches
… challenges such as high actuation voltages, stiction, and slower switching speeds compared to CMOS. One promising strategy to mitigate these issues is the integration of a self-assembled monolayer (SAM) to create tunneling NEM switches. Such switches could achieve nanometer-scale mechanical …
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Cross-Linked PDMS Expansion Due to Submersion in Liquid and Supercritical CO2
… fabrication, CO2 is often used in the release of stiction for sensitive microstructures. The experimental method was classified as low temperature techniques (less than 100 degrees Celsius). Commonly, the composite exhibits expansion ratio from 2.5% to 20%, exhibiting more sensitivity to the …
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A frequency reconfigurable slot antenna with a conductive microfluidic switching mechanism
… RF MEMS have issues with self-actuation and stiction. Fluidic reconfiguration mechanisms provide an alternative to these devices which do not suffer from the same effects due to their passive behavior that is not influenced by RF signal strength. In order to investigate the suitability of …
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Electrostatic Micro Gas Pumping for Micro Gas Chromatography Systems---Fabrication and Experiments
… with two passive valves tends to suffer in-use stiction, and challenges and suggestions are made to overcome these problems. Successfully developed devices are tested with various actuation voltages and various duty cycles, and corresponding stroke volume and flow rates are measured.
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Analysis of hybrid electrothermomechanical microactuators with integrated electrothermal and electrostatic actuation
… it may be used to overcome common problems like stiction that occur in MEMS switches.
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Study of a Modified Friction Device for the control of civil structures
… using the LuGre friction model that takes the stiction and Stribeck effect into account in the dynamic behavior. Then, several simulations have been run to evaluate how the device behaves and how it dissipates energy in a structure under seismic and wind loads. Three interesting results …
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Nonlinear springs with applications to flow regulation valves and mechanisms
… of the current production valve, yet resist stiction commonly associated with the freezing of the valve's internal components. The valve regulates the PCV system, which ventilates corrosive gases from the crankcase. Using the nonlinear spring design principles developed here, a valve has been …
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Electromechanical modulation of electrical conduction through organic thin films for switching applications
… the electrostatic force is removed, mitigating stiction-induced failure. In this thesis, the feasibility of the proposed switching mechanism is investigated through theoretical analysis of two- and three-terminal devices, demonstrating the possibility of energy efficient operation in the sub-1 V …
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Nonlinear dynamic model and simulation of a high pressure monotube shock absorber using the bond graph method
… pressurization, the amount of entrained air, and stiction are conducted in order to demonstrate the affects of these parameters on system performance. Results indicate the fundamental characteristics of shock absorbers are produced by the interaction of resistive and capacitive elements inherent …
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A study of reciprocating compressor finger valve dynamics
… were of good quality when the effects of oil stiction were taken into account. Also, the comparisons of the intake valve positions were of good quality after adjustments were made in the theoretical force on the valve calculation. The adjustments entailed accounting for flow-induced forces on …
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Development of an actively compliant underwater manipulator
… manipulator exhibiting no backlash, low stiction/friction, high backdriveability, wide dynamic range, and possessing a large work envelope. By reducing the inherent dynamic nonlineari ties, a wide range of joint compliances can realistically be achieved. This feature is important when …
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Design of ultra precision fixtures for nano-manufacturing
… of precision fixtures; (1) Elimination of stiction via integrated compliance, (2) Integration of sensors and actuators to enable correction of systematic and time variable alignment errors, and (3) Improvement of fixture contacts' stability and longevity via hard coatings. Conceptual and …
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Tunneling nanoelectromechanical switches based on compressible self-assembled molecules
… results in high hysteresis and the risk of stiction failure, thereby bringing about an inevitably high actuation voltage and unfavorable dynamic power consumption in practical device designs. The low switching speed, poor reliability and absence of scalable manufacturing technique also set …
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Molecular simulations of surfactants and silanes: Self-assembly in solutions and on surfaces, and friction between monolayers
… on the silica surfaces to address the problem of stiction induced failure in MEMS. A detailed molecular level examination of the structure of these films is limited with the available experimental methods. Therefore, this work undertakes an investigation of the structure and properties of …
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Fabrication of critical-angle transmission gratings for high efficiency x-ray spectroscopy
… and process latitude. A stress-induced grating stiction problem during wet hydrofluoric acid (HF) release is analyzed using finite element modeling (FEM) of a thin grating plane between support structures on top of oxide in compressive stress. I successfully fabricated the CAT gratings with 574 …
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