On the Driving Mechanism Design for Large Amplitude Electrostatic Actuation

2001 ◽  
Author(s):  
Jerwei Hsieh ◽  
Chien-Cheng Chu ◽  
Weileun Fang
Keyword(s):  
Mechanism Design ◽  
Large Amplitude ◽  
Driving Force ◽  
Driving Mechanism ◽  
Driving Voltage ◽  
Vibration System ◽  
Electrostatic Actuator ◽  
Output Amplitude ◽  
Actuator Design ◽  
Amplitude Amplification

Abstract This study intends to improve the performances of conventional electrostatic actuator regarding its amplitude and driving force. Two approaches including the oblique-comb actuator design and 2-DOF vibration system for amplitude amplification are proposed. The former has advantages in both generated force and allowable stroke, while the latter has the nature of larger output amplitude driven by smaller input stroke. Base on the advantages of both methods, the combination of these two designs can further improve the performance regarding output amplitude and driving voltage.

scholarly journals A force measuring microsystem bases on electrothermal V-shaped actuator

2020 ◽  
Author(s):  
Pham Hong Phuc
Keyword(s):  
Driving Force ◽  
Driving Voltage ◽  
Shaped Beam ◽  
Ansys Simulation ◽  
Melting Phenomenon ◽  
Beam Displacement ◽  
Previous Design ◽  
Amplification Mechanism ◽  
Measured Displacement

This paper describes design and calculation of an electrothermal V-shaped actuator (EVA) and an amplification mechanism integrated into a force measuring microsystem (FMMS), aims to apply for characterization of a micro beam. Displacement and driving force are generated by thermal expansion of the V-shaped silicon beams while applying a voltage to the electrodes of the EVA. ANSYS simulation helps to find out the relations between thermal force and displacement corresponding to driving voltage and determine the temperature of V-shaped beam at various applying voltages. In our simulation, with applying voltage Um = 38 volt for six pairs of V-shaped beam, the maximal temperature of the beam reaches approximately to 1100°C and causes a melting phenomenon of the silicon beam. The additional amplification mechanism allows actuator's displacement to be 6 times larger than before the improvement, thus the bending deformation of the micro beam can be seen perfectly, i.e. the force loading on the beam can be computed more exactly via a measured displacement of the beam tip. In addition, this FMMS has smaller size and supplies a larger beam's deformation at the same voltage in comparison with previous design.

scholarly journals Driving Mechanisms, Motion, and Mechanics of Screw Drive In-Pipe Robots: A Review

2019 ◽  
Vol 9 (12) ◽  
pp. 2514 ◽  
Author(s):  
Tao Ren ◽  
Yin Zhang ◽  
Yujia Li ◽  
Yonghua Chen ◽  
Qingyou Liu
Keyword(s):  
Mechanism Design ◽  
Driving Mechanism ◽  
Mechanical Behaviors ◽  
Pipe Inspection ◽  
Advantages And Disadvantages ◽  
Screw Drive ◽  
Driving Mechanisms ◽  
Pipe Networks ◽  
Design Requirements ◽  
Inspection Tasks

In recent years, interest in in-pipe robot research has been steadily increasing. This phenomenon reflects the necessity and urgency of pipe inspection and rehabilitation as several pipe networks have become outdated around the globe. In-pipe robots can be divided into several groups in accordance with their locomotion principles, each with its own advantages and best suited application scope. Research on the screw drive in-pipe robot (SDIR) has had a rising trend due to the robot’s simple driving mechanism design and numerous advantages. This study compares and analyzes the characteristics of various SDIRs from the aspects of mechanism design, driving principle, and motion and mechanical behaviors. Each SDIR has its own advantages and disadvantages depending on its design requirements and intended applications. A number of prototypes have been fabricated to verify their functionality and efficiency in inspection tasks. This study can provide an up-to-date reference for researchers to conduct further analysis on SDIRs.

Measuring vibration characteristics at large amplitude region of materials for high power ultrasonic vibration system

Ultrasonics ◽  
2000 ◽  
Vol 38 (1-8) ◽  
pp. 122-126 ◽  
Author(s):  
Kentaro Nakamura ◽  
Kiyotsugu Kakihara ◽  
Masahiko Kawakami ◽  
Sadayuki Ueha
Keyword(s):  
Ultrasonic Vibration ◽  
High Power ◽  
Large Amplitude ◽  
Vibration Characteristics ◽  
Vibration System ◽  
Power Ultrasonic

Mechanics of a Graphene Flake Driven by the Stiffness Jump on a Graphene Substrate

2017 ◽  
Vol 84 (8) ◽  
Author(s):  
Hong Gao ◽  
Hongwei Zhang ◽  
Zhengrong Guo ◽  
Tienchong Chang ◽  
Li-Qun Chen
Keyword(s):  
Molecular Dynamics ◽  
Analytical Model ◽  
Driving Force ◽  
Md Simulations ◽  
Driving Mechanism ◽  
Graphene Flake ◽  
Working Temperature ◽  
Directional Motion ◽  
Edge Force ◽  
Motion Behavior

Intrinsic driving mechanism is of particular significance to nanoscale mass delivery and device design. Stiffness gradient-driven directional motion, i.e., nanodurotaxis, provides an intrinsic driving mechanism, but an in-depth understanding of the driving force is still required. Based on molecular dynamics (MD) simulations, here we investigate the motion behavior of a graphene flake on a graphene substrate with a stiffness jump. The effects of the temperature and the stiffness configuration on the driving force are discussed in detail. We show that the driving force is almost totally contributed by the unbalanced edge force and increases with the temperature and the stiffness difference but decreases with the stiffness level. We demonstrate in particular that the shuttle behavior of the flake between two stiffness jumps on the substrate can be controlled by the working temperature and stiffness configuration of the system, and the shuttle frequency can be well predicted by an analytical model. These findings may have general implications for the design of nanodevices driven by stiffness jumps.

A Design of Innovative Experiment Platform Based on the Research of Flapping-Wing Aircraft

2014 ◽  
Vol 651-653 ◽  
pp. 587-592
Author(s):  
Bing Hao Zhu ◽  
Xiao Yi Jin ◽  
Li Li Zhao ◽  
Jing Yuan Zhang ◽  
Hua Cheng Tao
Keyword(s):  
Mechanism Design ◽  
Flapping Wing ◽  
Driving Mechanism ◽  
Experimental Platform ◽  
Experiment Platform ◽  
Design And Implementation ◽  
Design Scheme ◽  
Development Processes ◽  
Motion Parameters ◽  
Platform System

According to the fact that it need several tests to determine the size and motion parameters of the flapping-wing aircraft in the development processes, the paper proposed a design scheme of flapping wing system experimental platform. Separately from the scheme, the system platform, driving mechanism design, motion parameters change, described in detail the design and implementation of this innovation experiment platform. Users can simulate and debug the platform system to determine the performance of the flapping-wing mechanism.

Generalized stochastic resonance for a fractional harmonic oscillator with bias-signal-modulated trichotomous noise

2018 ◽  
Vol 32 (07) ◽  
pp. 1850072 ◽  
Author(s):  
Lifeng Lin ◽  
Huiqi Wang ◽  
Xipei Huang ◽  
Yongxian Wen
Keyword(s):  
Stochastic Resonance ◽  
Exact Expression ◽  
Order Moment ◽  
Periodic Signal ◽  
External Excitation ◽  
First Order ◽  
Trichotomous Noise ◽  
Output Amplitude ◽  
Fractional Harmonic Oscillator ◽  
Amplitude Amplification

For a fractional linear oscillator subjected to both parametric excitation of trichotomous noise and external excitation of bias-signal-modulated trichotomous noise, the generalized stochastic resonance (GSR) phenomena are investigated in this paper in case the noises are cross-correlative. First, the generalized Shapiro–Loginov formula and generalized fractional Shapiro–Loginov formula are derived. Then, by using the generalized (fractional) Shapiro–Loginov formula and the Laplace transformation technique, the exact expression of the first-order moment of the system’s steady response is obtained. The numerical results show that the evolution of the output amplitude amplification is nonmonotonic with the frequency of periodic signal, the noise parameters, and the fractional order. The GSR phenomena, including single-peak GSR, double-peak GSR and triple-peak GSR, are observed in this system. In addition, the interplay of the multiplicative trichotomous noise, bias-signal-modulated trichotomous noise and memory can induce and diversify the stochastic multi-resonance (SMR) phenomena, and the two kinds of trichotomous noises play opposite roles on the GSR.

Cooperative mechanism of resonant behaviors in a fluctuating-mass generalized Langevin system with generalized Mittag–Leffler memory kernel

2020 ◽  
Vol 34 (11) ◽  
pp. 2050109
Author(s):  
Lifeng Lin ◽  
Cong Chen ◽  
Huiqi Wang
Keyword(s):  
Stochastic Averaging ◽  
Order Moment ◽  
Generalized Langevin Equation ◽  
Driving Frequency ◽  
Wide Sense ◽  
Memory Kernel ◽  
Dynamical Mechanism ◽  
Output Amplitude ◽  
Bona Fide ◽  
Amplitude Amplification

In this study, we investigate the resonant behaviors in the fluctuating-mass generalized Langevin equation (GLE) with generalized Mittag–Leffler (M–L) memory kernel. By using the stochastic averaging method and Laplace transform, we obtain the exact expression of the first-order moment of system steady response, based on which we analyze the dynamical mechanism of the various non-monotonic phenomena. Based on tbe numerical results, we further discuss the dependence on various parameters systematically and study the interplay and cooperation between the generalized M–L memory kernel and trichotomous noise in terms of output amplitude amplification. The results reveal the coexistence of non-monotonic phenomena in the proposed system, such as bona fide stochastic resonance (SR), conventional SR and wide-sense SR. We even observe the stochastic multi-resonance (SMR) behaviors with five or six peaks in the evolution of output amplitude amplification varying with the driving frequency. It is worth emphasizing that quintuple-peak and sextuple-peak bona fide SR phenomena had never been observed in the previous literatures. Thus, these results will provide more extensive support for manipulating the resonant behaviors through system parameter control in the potential applications.

scholarly journals Study on a Large-Scale Three-Dimensional Ultrasonic Plastic Welding Vibration System Based on a Quasi-Periodic Phononic Crystal Structure

Crystals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 21 ◽  
Author(s):  
Jiyan Lin ◽  
Shuyu Lin
Keyword(s):  
Crystal Structure ◽  
Large Scale ◽  
Design Method ◽  
Phononic Crystal ◽  
Three Dimensional ◽  
Amplitude Distribution ◽  
Vibration System ◽  
Output Amplitude ◽  
Welding Surface ◽  
Plastic Welding

The uniformity of amplitude distribution and amplitude gain are two main factors affecting the performance of ultrasonic welding vibration system. In order to improve the uniformity of amplitude distribution and amplitude gain of welding surface to enhance the performance of the vibration system, a new design method of a large-scale three-dimensional ultrasonic plastic welding vibration system based on a quasi-periodic phononic crystal structure is proposed. In this method, the composite horn combined with a conical section and a cylindrical section can effectively improve the output amplitude gain of the welding surface. In addition, the method forms a quasi-periodic phononic crystal structure by slotting in a large-scale three-dimensional tool head, and utilizes the band gap property of the structure to effectively suppress lateral vibration of the tool head and improve the amplitude distribution uniformity of the tool head’s welding surface. However, when the size of the tool head is relatively large, the quasi-periodic phononic crystal structure cannot suppress the lateral vibration very well. Therefore, the paper processes fan-shaped slopes on the output surface of the tool head which can further improve the uniformity of the amplitude distribution and amplitude gain. Finally, the simulation analysis and experiments show that the design method can optimize the large-scale three-dimensional ultrasonic plastic welding system, improve the uniformity of the vibration distribution and increase the output amplitude gain of the welding surface.

Novel design, analytical and experimental studies of a piezoelectric ultrasonic linear actuator based on binate feet driving

2017 ◽  
Vol 29 (5) ◽  
pp. 787-799 ◽  
Author(s):  
Shupeng Wang ◽  
Weibin Rong ◽  
Lefeng Wang ◽  
Zhichao Pei ◽  
Lining Sun
Keyword(s):  
Experimental Studies ◽  
Experimental System ◽  
Step Length ◽  
Linear Actuator ◽  
Driving Mechanism ◽  
Driving Voltage ◽  
Loading Capacity ◽  
Driving Frequency ◽  
Element Analysis ◽  
Novel Design

This article presents the piezoelectric ultrasonic linear actuator based on binate feet driving. The actuator is equipped with a rhombus binate feet mechanism to generate two synchronous rectangle driving trajectories. With the help of the two synchronous trajectories, the proposed actuator can deliver stable long-range motion (the designed maximum stroke is 19 mm) accompanying with large loading capacity and high driving resolution. The configuration and operational principle are described in detail and the driving trajectory of the binate feet is analyzed. Finite element analysis is conducted to investigate the static deformation and stress status of the driving mechanism at every step. The experimental system is established to test the performance of the actuator prototype and the results indicate that the prototype can be operated stably step by step and all steps have high reproducibility. The driving resolution (minimum step length) of the actuator prototype is 25.9 nm. The maximum loading capacity and the maximum thrust are 37.2 and 3.2 N, respectively. The experimental results also confirm that the designed actuator can achieve various motion velocities by changing the driving voltage and driving frequency.

Observations of Large-Amplitude Mode-2 Nonlinear Internal Waves on the Australian North West Shelf

2019 ◽  
Vol 49 (1) ◽  
pp. 309-328 ◽  
Author(s):  
Matthew D. Rayson ◽  
Nicole L. Jones ◽  
Gregory N. Ivey
Keyword(s):  
Internal Waves ◽  
Large Amplitude ◽  
Transition Period ◽  
Local Mode ◽  
Driving Mechanism ◽  
Length Scale ◽  
North West ◽  
Nonlinear Internal Waves ◽  
Mode 2 ◽  
Amplitude Mode

AbstractLarge-amplitude mode-2 nonlinear internal waves were observed in 250-m-deep water on the Australian North West shelf. Wave amplitudes were derived from temperature measurements using three through-the-water-column moorings spaced 600 m apart in a triangular configuration. The moorings were deployed for 2 months during the transition period between the tropical monsoon and the dry season. The site had a 25–30-m-amplitude mode-1 internal tide that essentially followed the spring–neap tidal cycle. Regular mode-2 nonlinear wave trains with amplitudes exceeding 25 m, with the largest event exceeding 50 m, were also observed at the site. Overturning was observed during several mode-2 events, and the relatively high wave Froude number and steepness (0.15) suggested kinematic (convective) instability was likely to be the driving mechanism. The presence of the mode-2 waves was not correlated with the tidal forcing but rather occurred when the nonlinear steepening length scale was smaller than the distance from the generation region to the observation site. This steepening length scale is inversely proportional to the nonlinear parameter in the Korteweg–de Vries equation, and it varied by at least one order of magnitude under the evolving background thermal stratification over the observation period. Despite the complexity of the internal waves in the region, the nonlinear steepening length was shown to be a reliable indicator for the formation of large-amplitude mode-2 waves and the rarer occurrence of mode-1 large-amplitude waves. A local mode-2 generation mechanism caused by a beam interacting with a pycnocline is demonstrated using a fully nonlinear numerical solution.

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