- 标题
- 摘要
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- 实验方案
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Light- and humidity-driven actuators with programmable complex shape-deformations
摘要： Programmable complex shape-deformation, multi-responsive property and convenient fabrication are all crucial for the development of actuators. However, a simultaneous realization of all these advantages has not been reported. Here, we report a new type of light- and humidity-driven actuator with programmable complex shape-deformations. The fabrication employs a laser printing technology. The light-driven actuation is based on a dual-mode actuation mechanism which utilizes the water adsorption/desorption properties. When irradiated by near infrared light, the actuator shows a large bending actuation with a curvature up to 2.1 cm-1. More importantly, programmable complex shape-deformations can be realized by printing patterns with different/gradient grayscale distributions on the actuators. The bending rates and amplitudes of actuators can be programmed and controlled. Complex 3D shapes, such as an anomalous tube and a helical cylinder, are obtained. In addition, the actuator can also perform a curvature of 1.3 cm-1 when driven by humidity. Finally, a series of smart biomimetic devices with programmable complex shape-deformations are demonstrated, including a self-adjustment iris responding to incident light, a biomimetic hand demonstrating a complex “OK” gesture, and a lotus with folding petals of different bending rates. This new-type actuator will have great potential in robotics and biomimetic applications.
关键词： programmable,shape-deformation,biomimetic,actuator
更新于2025-09-23 15:21:01
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Design, Fabrication, and Testing of a New Compact Piezo-Driven Flexure Stage for Vertical Micro/Nanopositioning
摘要： This paper presents the design of a new compact one-degree-of-freedom (1-DOF) compliant stage driven by a piezoelectric actuator (PEA) for micro/nanopositioning in the vertical direction. An orthogonal compound bridge-type amplifier is introduced to amplify the displacement of the PEA. It significantly reduces the height of the stage and leads to a compact design. By analytical modeling of the mechanism, the design variables are determined, which are then optimized via the multiobjective genetic algorithm based on the finite-element analysis. Simulation results show that the 1-DOF stage is able to provide the maximum displacement of 181.18 μm in theory, which is more than 12 × the input displacement of PEA. Payload test results indicate that the stage can support a maximum load of about 80 N. Comparison study reveals that the presented vertical positioning stage offers a more compact structure than existing ones. A prototype is fabricated for experimental studies, and the deviation between the experimental and simulation results is discussed in detail. Moreover, closed-loop performance test exhibits a resolution of 10 nm for the developed vertical positioning stage.
关键词： flexure stage,piezoelectric actuator (PEA),micro/nanopositioning,Compliant mechanism,mechanism design
更新于2025-09-23 15:21:01
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Flexible and Electroactive Textile Actuator Enabled by PEDOT:PSS/MOF-Derivative Electrode Ink
摘要： Smart fabrics that integrate electronic devices with textiles are emerging as potential candidate for apparel and electronics industries. Soft actuators based on conducting polymers are promising for smart fabrics because of light weight, flexibility, and large deformation under low voltage. However, due to the distinct characteristics of textile and electronic components, the connection between textiles and electronic devices still keeps a challenge in development of smart fabrics. Here, we report an new strategy to prepare a flexible and electroactive textile actuator. The fabric electrolyte was directly coated with an electrode ink, which is composed of Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) doped with carbonized carbon nanotubes wired zeolite imidazolate framework-8 composite. A pre-treatment of the fabric was made by soaking hydrophobic poly(vinylidene fluoride-co-hexafluoropropylene) to increase the ionic conductivity (6.72 mS cm?1) and prevent the electrode ink from penetrating through the fabric. It was found that the textile actuator could work in air stably under a low voltage of 3 V and operate at frequencies from 0.1 to 10 Hz with large strain difference (0.28% at 0.1 Hz), fast strain rate (2.8% s?1 at 10 Hz) and good blocking force (0.62 mN at 0.1 Hz). The key to high performance originates from high ionic conductivity of fabric electrolyte and large specific surface area, good mechanical properties of the metal-organic framework derivative-based composite electrodes, which present insights into preparing other smart fabrics such as textiles sensors, flexible displays, and textile energy storage devices.
关键词： PEDOT:PSS,MOF derivative,textile actuator,i-EAP actuator,fabric electrolyte layer
更新于2025-09-23 15:19:57
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Tunable 2 ??m Fiber Laser Utilizing a Modified Sagnac Filter Incorporating Cascaded Polarization Maintaining Fibers
摘要： For a novel electric clutch actuator, a nonlinear feedforward–feedback control scheme is proposed to improve the performance of the position tracking control. The design procedure is formalized as a triple-step deduction, and the derived controller consists of three parts: steady-state-like control; feedforward control based on reference dynamics; and state-dependent feedback control. The structure of the proposed nonlinear controller is concise and is also comparable to those widely used in modern automotive control. Finally, the designed controller is evaluated through simulations and experimental tests, which show that the proposed controller satis?ed the control requirement. Comparison with proportional–integral–derivative control is given as well.
关键词： Automotive,position control,clutch actuator,nonlinear control
更新于2025-09-23 15:19:57
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Programmable graphene-based humidity and heat driven actuators prepared by one-step laser direct writing
摘要： Smart materials are gathering increasing attention and play important roles in intelligent actuators, among which films with Janus structure are widely used because of their intrinsic response ability. Herein, we report a highly simplified method, laser direct writing, for preparing GO (Graphene Oxide)/rGO (Reduced Graphene Oxide) Janus films. By adjusting the output power of laser, GO homogeneous films can be accurately reduced in a single step and a certain thickness can be controllably reduced to form GO/rGO Janus films. The structure and chemical composition of the resulting GO/rGO films were characterized. Their response to ambient temperature and humidity is determined experimentally. The response performance of Janus films with different thickness was tested, and the one with thickness of 15 μm performed the best. The Janus films are made into diverse actuators, including a bionic movable creeper and a grabber that can grab a leaf upon changing the humidity in a planned way. Furthermore, we designed a finger-guessing robot that can be programmed in advance and perform the predetermined actions.
关键词： reduced graphene oxide,actuator,Janus structure,graphene oxide,laser direct writing
更新于2025-09-23 15:19:57
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[IEEE 2019 7th International Youth Conference on Energy (IYCE) - Bled, Slovenia (2019.7.3-2019.7.6)] 2019 7th International Youth Conference on Energy (IYCE) - Design and Analysis of a Novel Solar Driven Multigeneration System for Providing Energy Requirement of A Building
摘要： For a novel electric clutch actuator, a nonlinear feedforward–feedback control scheme is proposed to improve the performance of the position tracking control. The design procedure is formalized as a triple-step deduction, and the derived controller consists of three parts: steady-state-like control; feedforward control based on reference dynamics; and state-dependent feedback control. The structure of the proposed nonlinear controller is concise and is also comparable to those widely used in modern automotive control. Finally, the designed controller is evaluated through simulations and experimental tests, which show that the proposed controller satis?ed the control requirement. Comparison with proportional–integral–derivative control is given as well.
关键词： Automotive,position control,clutch actuator,nonlinear control
更新于2025-09-23 15:19:57
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An Easily Fabricated Linear Piezoelectric Actuator Using Sandwich Longitudinal Vibrators With Four Driving Feet
摘要： A piezoelectric actuator using three sandwich longitudinal vibrators is proposed and tested. The two horizontal vibrators are parallel to each other and orthogonal to the vertical vibrator. The ends of the two horizontal vibrators serve as the four driving feet. The actuator has a simple fabricating process, which will shorten the period of fabrication. Two modes of the actuator are used to get the elliptical trajectories on the driving feet. The frequencies of the two modes are tuned to be about 21.60 kHz with modal analysis by the finite element method (FEM). The operating principle is also examined with transient analysis by FEM. A prototype is fabricated and its vibration characteristics are verified by using a scanning laser Doppler vibrometer. The prototype shows the best mechanical performance with the optimum working frequency and phase difference of 18.50 kHz and 60°, respectively. The typical output of the prototype is a no-load speed of 439.41 mm/s, a maximum thrust of 40 N, and a maximum power of 5.01 W at the voltage of 200 VP?P. The mechanical characteristics of the prototype show that the exciting voltages can be used for the speed control due to the approximately linear relationship between them.
关键词： resonant state,vibration test.,Linear piezoelectric actuator,sandwich longitudinal vibrators
更新于2025-09-19 17:15:36
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Non-Linear Piezoelectric Actuator with a Preloaded Cantilever Beam
摘要： 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 the design and analysis of a novel piezoelectric actuator that uses a piezoelectric cantilever beam with a loading spring to produce displacement outputs. This device has a special nonlinear property relating to converting between kinetic energy and potential energy, and it can be used to increase the output displacement at a lower voltage. The system is analytically modeled with Lagrangian functional and Euler–Lagrange equations, numerically simulated with MATLAB, and experimentally realized to demonstrate its enhanced capabilities. The model is validated using an experimental device with several pretensions of the loading spring, therein representing three interesting cases: a linear system, a low natural frequency system with a pre-buckled beam, and a system with a buckled beam. The motivating hypothesis for the current work is that nonlinear phenomena could be exploited to improve the effectiveness of the piezoelectric actuator’s displacement output. The most practical configuration seems to be the pre-buckled case, in which the proposed system has a low natural frequency, a high tip displacement, and a stable balanced position.
关键词： piezoelectric,cantilever,Hamilton’s principle,actuator,pretension,transducer
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Semi-Vectorial Optical Model of Quantum-Cascade Laser
摘要： The fault tolerant control problem is investigated for a class of uncertain networked control systems (NCSs) subject to actuator faults and actuator saturation in this paper. System parameter uncertainties are considered and a sector condition method is employed to deal with the saturation problem. Based on the network transmission environment, the NCSs can be modeled as a class of saturated discrete-time systems with time-varying delays and actuator faults. By using Lyapunov-Krasovskii (L-K) stability theory, a sufficient condition for the fault tolerant controller design of NCSs is derived in the form of linear matrix inequalities. Finally, simulation results are given to demonstrate the effectiveness of the proposed method.
关键词： actuator saturation,linear matrix inequalities,induced delays,Networked control systems,actuator faults
更新于2025-09-19 17:13:59
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Electricity-triggered Self-healing of Conductive and Thermostable Vitrimer Enabled by Paving Aligned Carbon Nanotubes
摘要： Electrically conducting films are important for the development of modern electronics. However, most of these conducting films become susceptible to structure fractures under the complex deformations or accidental damages, causing the devices to fail to work. Inspired by the self-healing capability of creatures, we developed a self-healing, thermostable, and electrically conducting film that can be healed by electricity by paving aligned carbon nanotube (CNT) sheets onto the surface of liquid-crystal elastomer composite films. The aligned CNT sheets make the composites conductive, so the composites can be healed not only by light, but also by electricity after breaking. The scratches on the self-healing film can be healed easily under a voltage of 1.18 V/mm because of the electro-thermal effect of aligned CNT sheets. The healed film has almost the same mechanical properties compared to the pristine sample. The electrical and mechanical self-heal of the film is derived from the electrical reconnection of carbon nanotubes and transesterification-induced topology change of the network, respectively. We further demonstrated soft actuators and high-performance supercapacitors based on the prepared self-healing conducting films. This method for preparing self-healing conducting films enables the development of self-healing electronics.
关键词： electro-thermal effect,soft actuator,self-healing conducting film,flexible electronics,carbon nanotube sheet
更新于2025-09-19 17:13:59