A5021204078- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Innovative Energy Harvesting Technologies
- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Force Microscopy Techniques and Applications
- Advanced Sensor and Energy Harvesting Materials
- Electronic Packaging and Soldering Technologies
- 3D IC and TSV technologies
- Fluid Dynamics and Thin Films
- Metamaterials and Metasurfaces Applications
- Temporomandibular Joint Disorders
- Aluminum Alloys Composites Properties
- Advanced Antenna and Metasurface Technologies
- Acoustic Wave Resonator Technologies
- Additive Manufacturing and 3D Printing Technologies
- Surfactants and Colloidal Systems
- Osteoarthritis Treatment and Mechanisms
- Advanced Chemical Sensor Technologies
- Graphene research and applications
- Antenna Design and Analysis
- Shoulder Injury and Treatment
- Characterization and Applications of Magnetic Nanoparticles
- Gas Sensing Nanomaterials and Sensors
- Nanomaterials and Printing Technologies
Shanghai Jiao Tong University
2014-2025
Tongren Hospital
2018
A novel electromagnetic energy harvester structure with a highly efficient closed magnetic circuit is presented. An opposite polarity arrangement of permanent magnet pair results in the maximum change flux linkage solenoid when vibration. The strong coupling between stator iron cores and vibrating magnets leads to significantly enhanced output voltage power broadened operation bandwidth. Compared open circuits, can effectively improve power. root mean square 67 mV, working bandwidth 7.3 Hz,...
A novel nickel-based nonlinear electromagnetic energy harvester has been designed, fabricated, and characterized in this work. Electroplated nickel is very suitable for a stretching-based mechanism to broaden the bandwidth due its good process mechanical properties. strong hardening nonlinearity induced large deformation of thin based guided-beam structure. Combining merits both properties structure, shows performance. It found that increasing thickness central platform could guarantee...
This paper proposes an electrostatic actuator suspended on clamped-guided beams with inherent nonlinear behavior. Under large deflection, a flat beam is characterized by cubic force–displacement behavior without any additional auxiliary. We utilize the nonlinearity to reduce pull-in voltage, extend travel range and simplify configurations. The theoretical analyses voltage of spring were comprehensively implemented. In order examine proposed approach, actuators suspension linear spring,...
The "soft-landing" effect during the closure of RF-MEMS switches is crucial for improving their reliability. However, rebound suppression effectiveness has rather poor robustness against dimension deviations and waveform distortions resulting from micro-fabrication tolerance, wear tear, circuit aging in device's life-cycle. In contrast to traditional constant stiffness system, this letter proposes a novel self-adaptive approach, whereby system's increases markedly with increasing...
Anchorage is one of the most important treatments for severe temporomandibular joint disorder (TMD). Anchoring nails have shown great success in clinical trials; however, they can break under pressure and are difficult to remove. In this study, we aimed evaluate an improved anchoring nail its mechanical stability. The experiment consisted two parts: a tensile test finite element analysis (FEA). First, traditional were implanted into condylar cortical bone their strength was measured using...
In this study, we developed a new method to fabricate microcoils with narrow and high aspect ratio coil lines using TSV UV-LIGA technology in SU-8 mold. The combination of makes it possible microstructures ratio. resolved the difficulties electroplating We designed fabricated consisiting widths 15μm 2.
This paper presents a nonlinear electrostatic actuator which utilizes the mechanical properties of classical clamped-guided beam springs with large deformation to slow impact velocity movable plates. The initial stiffness spring is very small but increases significantly displacement. In this way, increased kinetic energy would be limited. At same time, because stiffness, lower driving voltage can generate enough overcome restoration force reach dynamical pull-in stage. experiments indicated...
This paper reports on a novel implanting micromachining technology. By using this method, for the first time, we could implant both ends of nano-scale materials into micro-scale metal at room temperature. Micro gas sensor with CNT bridging pair Au electrodes was fabricated. Direct contact and strong interactions between CNTs electrods contribute to its stable electronic performance (8,000 s 1% fluctuation resistance change exposed nitrogen). The micro sensors also exhibit high response, fast...
An inherent variable stiffness approach was proposed to suppress the rebound and impact of electrostatic switch due waveform deviations. A simple clamped-guided beam spring with large deflection, which generated cubic nonlinear restoring force, adopted for implementation approach. The initial is very small but increases significantly displacement. In this way, force mostly concentrated in second half operation stroke during closing switch, weakens sensitivity device performance actuation...
In this paper, we propose an inherent variable stiffness approach to suppress bounce of electrostatic actuator caused by the gap deviation which is unavoidable because micro-fabrication deviation, tear and wear in device life-cycle. The realized through simple clamped-guided beam with large deformations. It have been demonstrated that for 0.3 μm variation, fluctuation collision speed (from zero 2.7cm/s) 62% less than constant counterpart 7.18cm/s) under dual pulse voltage actuation....
Contact bounce, high driving voltage, and poor robustness to process deviations are the main bottlenecks that limit reliability of MEMS electrostatic switches. In this study, a variable stiffness strategy offers an optimized path reach closure position for movable electrode. proposed method, switching system's is low enough reduce voltage at initial stage but increases rapidly as electrode approaches braking. Our experimental results prove can suppress contact pull-in without compromising...
In this paper, we designed and fabricated a highly nonlinear suspension flexure with geometrically predetermined eighth order force-displacement relation for extension of the stable travel range electrostatic actuator. Its strong nonlinearity is obtained by rolling slide between customized curved trajectory ball at tip mandril. The behavior can be adjusted dominated trajectory. experimental result illustrates that restoring force proportional to power electrode displacement approximately,...