Piezo-driven precision positioning platforms with large stroke are greatly demanded in both scientific research and industrial applications. Although various principles have been proposed to design piezo-driven platforms, the problem of backward motion commonly exists, hindering their To suppress motion, this paper, an idea by generating a forward frictional force balance reversed was proposed. Correspondingly, specific arc-shape flexure hinge designed generate via its elastic recovery....

China has the largest output of litchi in world. However, at present, is mainly picked manually, fruit farmers have high labor intensity and low efficiency. This means intelligent unmanned picking system broad prospects. The precise location main stem point very important for path planning an system. Some researchers identified branches litchi; however, there relatively little research on litchi. So, this paper presents a new open-access workflow detecting accurate locations stems data used...

DE MOF-derived ZnO nanoclusters with tunable surface oxygen vacancies are synthesized. Comprehensive characterization techniques and DFT calculations indicate that effectively promote the TMA sensing performance.

To elucidate the effect of chrysin on α-haemolysin production by Staphylococcus aureus and protection against pneumonia in a murine model.Haemolysis, Western blot real-time RT-PCR assays were performed to evaluate secretion Staph. aureus. The efficacy human alveolar epithelial cell injury was tested using live/dead staining or measuring lactate dehydrogenase activity. Furthermore, we determined protective through histopathology experiments mouse model. inhibited when presented with an...

Motion speed is an important parameter of stick-slip piezoelectric actuators. However, most the existing actuators achieve a high motion by operating under quite driving frequency. Operation frequency will affect stability and as well accelerate wear contact surfaces. To realize relatively low operation frequency, here specific L-shape flexure hinge was employed to design actuator. Its structure design, working principle processes, selection, output performances were studied in detail. The...

Backward motion commonly exists in the stick-slip linear piezoelectric actuator, resulting deterioration of output performance and limiting their applications. To solve problem, a actuator with suppressed backward motion, achieved using an active-locking mechanism (ALM) two mechanisms, is proposed this paper. One involves driving, while other actively suppresses by clamping slider during driving process through efficient control. A prototype was designed manufactured to verify feasibility...

Multi-degree of freedom piezoelectric actuators are strongly needed for industrial applications, especially when manipulating a large and heavy mirror or lens in an optical system. A novel three-degree-of-freedom actuator, which is driven by two pairs piezo-stack actuator with spatial compliant mechanisms designed to guide the motion preload actuators, herein proposed. The structure working principle proposed illustrated its kinematic characteristic analyzed. stiffness modeled, dynamic...

To determine the antimicrobial activity of costus (Saussurea lappa) oil against Staphylococcus aureus, and to evaluate influence subinhibitory concentrations on virulence-related exoprotein production in staph. aureus.Minimal inhibitory (MICs) were determined using a broth microdilution method, MICs 32 Staph. aureus strains ranged from 0.15 0.6 μl ml(-1) . The MIC(50) MIC(90) 0.3 , respectively. Western blot, haemolytic, tumour necrosis factor (TNF) release real-time RT-PCR assays performed...

Existing kinds of stepping piezoelectric actuators have difficulty in maintaining smooth characteristics motion, especially with applied loads, because they are limited by their driving principle and structural design. However, non-smooth not only reduce the output performance but also greatly limit applications actuators. In this paper, a bipedal cooperative drive method for stick-slip actuator is proposed to improve achieve motion under different conditions. Two flexible feet alternately...

This paper presents a stick–slip piezoelectric actuator with high consistency in performances of forward and reverse motions. It is achieved by developing an integrated stator which bonds two lead zirconate titanate ceramic plates to symmetrical flexible hinge mechanism. The working principle the was introduced, optimized finite-element analysis. Experimental results showed that proposed had excellent output motions or without external load. positioning resolution, maximum speed, loading...

The sucking outflow phenomena of a passive piezoelectric pump under the square wave driving is studied and hydrodynamics model vibration are built to analyze theoretically physical process process.Then,an open height formula exiting valve in processing derived.The measured during different frequencies 0.4,0.8,6,45 Hz,and other factors effecting on verified.In theoretical analysis,it points out that flow inertia root cause for phenomena,and inertial also exists draining process.The experiment...

Correction for ‘High-performance trimethylamine gas sensors based on defect-engineering MOF-derived ZnO nanoclusters with tunable surface oxygen vacancies’ by Shaoyuan Yu et al. , J. Mater. Chem. A 2022, https://doi.org/10.1039/D2TA07048K.

Abstract In order to reduce the regression phenomenon of piezoelectric stick-slip actuator, and improve output performance, a actuator with regular octagonal flexible hinge mechanism is proposed in this paper. The pseudo-rigid body method used analyze driving foot respectively.A prototype fabricated test working performance results demonstrate that minimum step 0.01μm, maximum speed 145251μrad/s, load carrying capacity 500g. experimental show parasitic motion suppresses improves stability.

Piezoelectric actuation is widely used for the active vibration control of smart structural systems, and corresponding research has largely focused on linear electromechanical devices. This paper investigates design analysis a novel piezoelectric actuator that uses cantilever beam with loading spring to produce displacement outputs. device special nonlinear property relating converting between kinetic energy potential energy, it can be increase output at lower voltage. The system...

Piezoelectric accurate actuation plays an important role in industrial applications. The intrinsic frequency of previous actuators is invariable. However, variable can approach the range near low-intrinsic-frequency and realize a high capability. frequency-variable linear rotary motion (FVLRM) principle proposed for rotor-blade-based two-degree-of-freedom driving. Inertial force generated by piezoelectric oscillators (FVPO), base vibration modes which are adjustable changeable mass position...

In order to solve the contradiction between lightweight and noise of a vibrating cantilever beam, active control actuated by piezoelectric ceramics is presented in this study. The dynamic model beam established finite element method (FEM). actuator excited signal bonded near fixed end suppress beam's first vibration mode. collected sensor processed quadratic optimal theory. Experiment results show that amplitude controlled reduced 48.2% than uncontrolled one under constant external excitation.