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Control of spool position of on/off solenoid operated hydraulic valve by sliding-mode controller
Springer Science and Business Media LLC - Tập 29 - Trang 5395-5408 - 2015
The use of on/off solenoid operated hydraulic valves instead of proportional valves has been attracting the interest of many researchers and engineers. However, there exist difficulties in controlling the on/off valve because of highly nonlinear characteristics including hysteresis and saturation. This paper considers the application of on/off solenoid operated hydraulic valves to control position......
Modified breathing mechanism model and phase waterfall plot diagnostic method for cracked rotors
Springer Science and Business Media LLC - Tập 32 - Trang 2527-2539 - 2018
Transverse breathing cracks are a primary damage mode in rotor systems and seriously influence the safety and reliability of equipment operation. The vibration characteristics exhibited by cracked rotors when passing through critical speeds serve as important evidence in the diagnosis of cracks, and a breathing mechanism model without weight dominance is needed to study these resonant characterist......
Contributions of the lower extremity joint on the support moment in normal walking and in unexpected step-down walking
Springer Science and Business Media LLC - Tập 19 - Trang 371-376 - 2005
ARelative contributions of lower extremity joints on the support moment were investigated in this study Three-dimensional gait analyses were performed in normal walking and in unexpected step-down walking For both gait studies, inverse dynamics were performed to obtain each joint moment of the lower extremity, which was applied to the forward dynamics simulation to determine the contributions on t......
Design and performance verification of compound CVTs with 2K-H I type differential gear
Springer Science and Business Media LLC - - 2006
Injection profile effects on low speed axial compressor stability enhancement
Springer Science and Business Media LLC - Tập 25 - Trang 1501-1507 - 2011
This study presents stability enhancement of a four-stage low speed axial compressor with different injection profiles. The injection profiles include one-step injection, multi-step injection, and continuous injection. For the tip injection, eight Coanda-shaped nozzles have been installed at eight equally spaced circumferential locations upstream of the first stage rotor. Two external blowers inje......
Numerical and experimental analysis of coupled transverse and longitudinal vibration of a marine propulsion shaft
Springer Science and Business Media LLC - Tập 30 - Trang 5405-5412 - 2016
An appropriate assessment of the dynamic behavior of marine propulsion shaft in ships is essential to enable optional delivery of power to the propeller and to minimize unnecessary vibration. Various vibrations coupling with each other can significantly influence the dynamical behavior of the shaft and threaten the reliability of ships. This paper presents a finite element analysis model with mult......
Numerical analysis of distortions by using an incorporated model for welding-heating-cutting processes of a welded lifting lug
Springer Science and Business Media LLC - Tập 32 - Trang 5855-5862 - 2018
A lifting lug is a widely used welded structure in the shipbuilding industry. Welded lugs with holes that are attached to heavy blocks are hooked onto and transported by a crane. The lugs are cut away after the heavy blocks are set up at the right position. In this study, a new thermal compensation method was proposed to improve the productivity of removing a lifting lug by band saw cutting. A lif......
Evaluation of the effects of machining parameters on MQL based surface grinding process using response surface methodology
Springer Science and Business Media LLC - Tập 31 - Trang 3907-3916 - 2017
Grinding is a precision machining process widely used for close tolerance and good surface finish. Due to aggregate of geometrically undefined cutting edges and material removal in the form of microchips, grinding requires more specific energy as friction is greater in the grinding interface. The optimum use and proper penetration of coolant is the prime requirement which is achieved by effective ......
Effect of magnetic field on thermal conductivity and viscosity of a magnetic nanofluid loaded with carbon nanotubes
Springer Science and Business Media LLC - Tập 30 - Trang 809-815 - 2016
The present work examines experimentally the effect of magnetic field on the viscosity and thermal conductivity of a hybrid nanofluid containing tetramethylammonium hydroxide (TMAH) coated Fe3O4 nanoparticles and Gum arabic (GA) coated carbon nanotubes (CNTs). The hybrid nanofluid was prepared by using ultrasonic dispersion method. Magnetic field was created by a pair of spaced apart magnet plates......
Phase extraction formula for glass thickness measurement using Fizeau interferometer
Springer Science and Business Media LLC - Tập 35 - Trang 1623-1632 - 2021
The thickness variation of transparent optical flats has become a crucial parameter owing to the development of display and semiconductor technologies. Systematic offset phase errors can be generated when the absolute thickness of samples is profiled using a Fizeau interferometer. In this study, a novel 11-sample phase extraction formula was developed to suppress offset phase errors during thickne......
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