Force–displacement transducers are key components in situ nanoindentation systems. The current existing capacitance-type adopted state-of-the-art commercial systems restricted by limited maximum ranges, and strain gauge-type the have limitation of low resolution high values mass. In paper, we propose a mechanical design improvement low-mass force–displacement transducer capable performing measurements. mainly consisted parallelogram-shaped flexure hinge two gauges. Air resolution, mass...

Piezoelectric stick–slip drive nanopositioners are of central importance in situ SEM nanorobotic systems due to their high precise positioning, large stroke, speed, and compact structure. However, the output velocity under load will be seriously influenced. In this paper, a new piezoelectric nanopositioner with by introducing adjust bolts decouple driving unit moving is presented. A MATLAB simulation model has been created optimize for certain velocity, FEM used confirm that leaf hinge...

The piezoelectrically-actuated stick-slip nanopositioning stage (PASSNS) has been applied extensively, and many designs of PASSNSs have developed. friction force between the surfaces plays a critical role in successful movement stage, which influences load capacity, dynamic performance, positioning accuracy PASSNS. Toward solving influence problems force, this paper presents novel where flexure hinge-based adjusting unit was employed. Numerical analysis conducted to estimate static...

<title>Abstract</title> In the field of psychology and cognition within closed cabins, noncontact vital sign detection holds significant potential as it can enhance user experience by utilizing objective measurements to assess emotions, making process more sustainable easier deploy. To evaluate capability methods for emotion recognition in spaces, such submarines, this study proposes an method that employs a millimeter-wave radar capture respiration signals uses machine-learning framework...

In the field of psychology and cognition within closed cabins, noncontact vital sign detection holds significant potential as it can enhance user’s experience by utilizing objective measurements to assess emotions, making process more sustainable easier deploy. To evaluate capability methods for emotion recognition in spaces, such submarines, this study proposes an method that employs a millimeter-wave radar capture respiration signals uses machine-learning framework classification....

In order to investigate the deformation behavior of a plate during vertical-horizontal rolling process, thermo-mechanical coupling analysis is carried out by three-dimensional (3-D) rigid-plastic FEM simulate process. The metal flow and shape evolution are focused this investigation. thickness width agree well with measured values.

In order to realize effective laser communication on underwater mobile platforms, the active tracking and alignment technology of (UWLC) is studied. Firstly, servo control principle UWLC system analyzed. Secondly, aiming at disturbance, an adaptive fuzzy PID controller designed parameter self-tuning, thereby improving system’s anti-disturbance ability. The algorithm was simulated, simulation results show that has better ability performance than traditional PID. Finally, experimental platform...

Nanopositioning stage is of central importance in the nanorobitic system. The working principle piezoelectric stick-slip actuating combines merits and a preferable option to design nanopositioning with advantage high resolution, large stoke compact mechanical structure. However, existing techniques driving paid little attention adjustable friction force which significantly affects motion properties load capability. Our goal was develop novel that can be adjusted, consequently, speed are...

Instrumented indentation test inside SEM has become a versatile method for nanomechanical characterization and studying of deformation failure mechanisms coating materials at nano-to micro-scale thickness. However, the existing SEM-based nanoindentation instrument cannot acquire surface roughness thickness before morphology residual imprints in real-time after nanoindentation. To overcome those two limitations, new integrated with AFM function been developed. This paper presents miniature...

The process parameters including the mandrel structure of radial-axial ring rolling is in close relationship with forming defects such as over-high axial spread and folding defect connecting part big small ring. In this paper, a 3D rigid-plastic coupled thermal-mechanical finite-element model (FEM) for large-scale T-sectioned was developed using commercial software DEFORM-3D. By changing chamfer radius mandrel's work roll, effects on height which considerably affects stability were...

The dynamic recrystallization (DRX) behavior of GH80A superalloy was investigated by isothermal compression tests on a Gleeble1500 thermomechanical simulator. True stress-strain curves and deformed specimens were obtained at the temperature range 1273-1473K strain rate 0.01-5s -1 . Experimental results show that low display typical DRX characteristic. By regression analysis experimental results, Materials constant n , activation energy Q Zener-Hollomon ( Z ) parameter determined, critical...

Abstract To meet the application requirements of zero boil-off storage cryogenic liquid krypton propellant in process completing deep space exploration missions by electric propulsion system, it is important to study thermodynamic changes tanks under different environments. The gas phase and material model working fluid, gas-liquid change at interface layers, heat transfer between wall internal fluid are established ANSYS-Fluent. energy source term, phase, mass saturation temperature tank...

Abstract This paper presents a novel piezoelectric hybrid-driven nanopositioner using combined leaf-spring-shaped and C-shaped flexure hinge mechanism. The combines the stick-slip-driven scanner in single compact device. advance can decrease size of nanoscratch-AFM hybrid system make compatible with limited space SEM vacuum chamber. A combining mechanism is developed to improve load capability nanopositioner. Unlike existing methods improving load-capability by decreasing kinetic friction...

In the present study, TA1 titanium alloy sheets with a thickness of 0.8mm were welded by electron beam welding. Microstructure region was investigated using optical microscope and backscattered diffraction. Then, tensile test conducted to analyse behavior as well fractography fracture surfaces. It is shown that mean grain size in heat-affected zone smaller than fusion base material. The strength metal lower zone. average values yield strength, elongation specimens are 224MPa, 335MPa 35%,...