A5038760192- Turbomachinery Performance and Optimization
- Tribology and Lubrication Engineering
- Magnetic Bearings and Levitation Dynamics
- Rocket and propulsion systems research
- Thin-Film Transistor Technologies
- GaN-based semiconductor devices and materials
- Refrigeration and Air Conditioning Technologies
- Heat Transfer and Optimization
- Combustion and flame dynamics
- Thermal properties of materials
- 3D IC and TSV technologies
- Advanced Aircraft Design and Technologies
- Fuel Cells and Related Materials
- Advancements in Solid Oxide Fuel Cells
- Flow Measurement and Analysis
- Bladed Disk Vibration Dynamics
- Advanced Sensor Technologies Research
- Computational Fluid Dynamics and Aerodynamics
- Aerospace Engineering and Control Systems
- Hydraulic and Pneumatic Systems
- Electromagnetic Launch and Propulsion Technology
- Thermal Radiation and Cooling Technologies
- Wind Turbine Control Systems
- Guidance and Control Systems
- Advanced Combustion Engine Technologies
National Yunlin University of Science and Technology
2023-2024
National Taiwan University Hospital
2023-2024
National Chin-Yi University of Technology
2011-2021
National Tsing Hua University
2002-2010
National Taiwan University of Science and Technology
2004
Finite element analysis models were developed to investigate the dynamic characteristics of single- and dual-rotor-bearing turbomachinery systems. When an inertial coordinate system was used, rotor-bearing systems included gyroscopic moments, rotary inertias, bending shear deformations. The analyzed predict natural frequencies, produce critical speed maps, estimate bearing stiffnesses. These analyses then applied both single-rotor dual-rotor applications. In application, a small turbojet...
Both jet impingement and forced convection are attractive cooling mechanisms widely used in gas turbine blades. Convective heat transfer from impinging jets is known to yield high local area averaged coefficients. Impingement of particular interest the components where advancement relies on ability dissipate extremely large loads. Current research concerned with measurement comparison both Reynolds number range 10,000 30,000. This study aimed at experimentally testing two different setups...
Because of their high efficiency and very low emissions, fuel cells have been one the choice areas research in current energy development. The solid oxide cell (SOFC) is a type high-temperature cell. It has characteristic operating temperature 1,027°C (1,300 K). SOFC main advantage performance (more than 50%) but also exhaust temperatures. Current studies point out that combination gas turbine (GT) can produce more 60%. this hybrid power system be as 227–327°C (500–600 With waste heat...
The cooling coefficient of performance (COPR) and energy efficiency ratio (EER) refrigerant R-134a compressors (single- double-compressors) with different tonnage (200, 250, 300, 380, 500, 700 RT) for centrifugal Maglev change operating load percentages (10–100%), constant-frequency variable-frequency operation, resulting in differences. In particular, a water chiller can have fixed inlet temperature 32 °C variable between 18.33 °C. According to the actual test results, commercial code...
It is very common for aircraft engines to have dual rotor or even triple designs. Due the complexity of having multiple design, transfer matrix methods used in past deal with rotor-bearing systems. However, due method’s assumptions, sometimes resulted numerical stability problems root-missing problems. The purpose this paper develop a systematic theoretical analysis dynamic characteristics turbomachinery This system will start finite element (FEM) model, then using different verify results...
An investigation was conducted to perform study of small turbojet engine testing and analysis. This program mainly investigate the current steady dynamic performance a 12-pound thrust engine. As result, we can establish basis for future design guidelines. involved bench at both off-design conditions, in order baseline Using PC based data acquisition system, will be able test record different operating especially, during very rapid acceleration deceleration rates. Also, compressor map provide...
This paper focuses on the heat transfer and structural stress analysis of micro- scale packaging structure a high-power light emitting diode. The thermal-effect thermal-stress diode are determined numerically. Light is attached to silicon substrate through wire bonding process by using epoxy as die bond material. etched with holes at bottom filled high conductivity copper chip temperature increase input power consumption. micro mounted sink dissipation performance, decrease temperature,...
Dental air turbine handpieces have been widely used in clinical dentistry for over 30 years, however, little work has reported on their performance. In dental handpieces, the types of flow channel and blade shape can very different designs. These designs major influence torque, rotating speed, power This research is focused Using numerical simulation experiments, key design parameters which performance hand pieces be studied. Three with blades, nozzle angles, channels, shroud clearances were...
adsorption dust collection device (VADCD)The indoor air quality of a fully enclosed office can be improved by using an energy recovery ventilator (ERV) and voltage (VADCD).The effects the pollutant location equipment setup on pollutants are analyzed recording observing changes in concentration, simulation computational fluid dynamics (CFD) approach.The experimental analysis results show that CO 2 concentration increases with number people indoors.The diffusion gradually removed if ERV is...
This study focuses on the use of indium gallium nitride multichip for ultra-high power light emitting diode (LED) heat transfer and thermal cooling analysis. research approach is based LED experimental aluminum extrusion sink air-conditioning system-forced approach. An investigation characteristics phenomenon variation conducted to improve performance develop an system that can become a reference guideline design assembly. study's package structure silicon substrate material fill copper...
Turbomachinery shrouded rotor blade design has been widely used in fans, compressors, and turbines. By using shroud design, the structural damping can be increased to prevent flutter. However, will cause mode shapes complex, some cases both bending torsion components present at same time a single mode. Therefore, complex analysis was developed predict flutter with these combined system modes. Using natural frequencies from finite element model, aerodynamic flow-field, unsteady forces of...
An LED is solid-state lighting with low environmental impact and green technology.It has the advantages of high luminance, long life, structural strength, short reaction time.With continuous improvement in luminous efficiency, heat energy accumulates rapidly, resulting a chip-on-board (COB) array contact surface that easily exceeds specification temperature T j exhibits sharp drop light attenuation.Therefore, we blended graphene powder materials silicone oil to develop excellent grease (10,...
This study is focused on the dynamic characteristics of a vertical turbomolecular pump (TMP) rotor-bearing system. The research methods can be divided into two parts, which are numerical analysis and experimental measurements. In analysis, we use finite element software DyRoBeS ANSYS to construct two- three-dimensional models process, by using system assembly testing data, verify under different boundary conditions. Next, calculate Campbell diagram system, compare with results models....
In this study, a self-adjusting concentration of graphene thermal grease was developed to reduce the contact surface resistance 50 W light-emitting diodes (LEDs). The purpose identify an important type heat conduction material with high conductivity coefficient, which can be applied various high-heat sources or concentrated achieve seamless transfer extremely low state. reached highest K value 13.4 W/m·K 15 wt.% grease. This could continuously completely uniform and rapid diffusion energy....
Genome-wide association studies (GWASs) have linked RRBP1 (ribosomal-binding protein 1) genetic variants to atherosclerotic cardiovascular diseases and serum lipoprotein levels. However, how regulates blood pressure is unknown.To identify associated with pressure, we performed a genome-wide linkage analysis regional fine mapping in the Stanford Asia-Pacific Program for Hypertension Insulin Resistance (SAPPHIRe) cohort. We further investigated role of gene using transgenic mouse model human...
2-deoxy-D-glucose (2DG) is a glucose analog converted to 2-deoxy-D-glucose-6-phosphate (2DG-6P) by hexokinase in glycolysis. While 2DG commonly measures uptake, 2DG-6P detects utilization. Here, we present protocol measure utilization various tissues after entering mouse's body using radiolabeled 2DG. We describe steps for preparing mice and chemicals, extracting blood, adding dissolving tissue. then detail procedures calculating the trapezoid rule.
The concept of rapid thermal processing (RTP) has many potential applications in microelectronics manufacturing, but the detail chamber design remains an active area research. Within framework linearized thermoelasticity theory, temperature and stresses on wafer for RTP are solved by using a fully implicit finite difference approach Thomas algorithm conjunction with maximal shear stress failure criterion. results show that radial produces can often exceed yield silicon wafers, causing...
With high efficiency and very low emissions, fuel cells have been one of the choices research in current energy development. The Solid Oxide Fuel Cell (SOFC) is a temperature type cell. It has characteristic operating 1,027°C (1,300K). SOFC main advantage performance (over 50%), but also exhaust temperature. Current studies point out that combination Gas Turbine (GT) can produce more than 60%. this hybrid power system be as 227–327°C (500–600K). waste heat utilized, we further improve...
The relatively constant flow of the ocean currents carries large amounts energy that can be captured and converted to a usable form. In this paper, design performance simulation horizontal axial current turbine (OCT) are studied. Also, study on varying duct housing parameters series analyses were performed. Our model simulations with without compared existing literature results very good agreements obtained. also showed unducted power output is proportional cube speed. Therefore, if we...
A microturbine of 12-pound thrust was developed for the Unmanned Aerial Vehicle (UAV) applications. Recent tests microturbines reveal problems associated with rear ball bearing integrity after extended run times. The rotor design originally calls a critical speed margin at least 15∼20% to prevent excessive vibrations. However, using an existing turbocharger component unknown margins. Therefore, purpose this paper is perform both theoretical and experimental analyses dynamic characteristics...