The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Limited travel constrains the widely application of XYZ parallel micro/nano-positioning stage. In this paper, a novel parallel-kinematics micro/nano-positioning stage is proposed with the goal of enlarging the travel range. In order to obtain a large input displacement for actuating the stage, voice coil motors (VCM) are adopted. For a large-travel parallel stage, the cross-axis motion increases the...
This paper presents the design, fabrication and testing of a micro-injector for precision injection of biological cells. Based on the specifications on travel range and injection speed, a single-axis translational motion mechanism is designed by using flexure mechanisms for precision motion guiding of the micro-injector. The mechanism parameters are designed and optimized to cater for the requirements...
This paper presents a cell recognition method aiming at guiding the implementation more simply and effectively for injecting multiple cells using biological cell injection systems. The cells are randomly placed in the field of view of a microscope. In particular, the method is proposed to guide the cell grasping device through computer vision to grasp multiple cells in a field of image region without...
This paper presents the mechanical design of a novel 3-PSS (P and S represent the prismatic and spherical joints, respectively) parallel-kinematic flexure nanopositioning stage. This stage provides a high-precision motion driven by three piezoelectric actuators. By employing the compound displacement amplifier and 3-PSS parallel mechanism, the flexure nanopositioning stage can deliver two rotational...
This paper reports on a novel 3D-printed polymeric compliant constant-force buffering gripping mechanism. The motivation of this work is to develop a buffering gripping mechanism to avoid the damage of manipulated biological object induced by excessive displacement output. The presented zero-stiffness mechanism is realized by connecting the negative-stiffness part and positive-stiffness part in parallel...
This paper presents the design of a flexure-based precision positioning micro-motion stage system with constant output force. The stage mechanism is devised using folded leaf flexure (FLF) to achieve positive-stiffness structure. Bistable beams are employed to design negative-stiffness structure by using their buckling characteristics. Two bistable beams and two FLFs are combined together as a zero-stiffness...
This paper proposes the design of a compliant constant-force gripper mechanism for manipulating biological objects. It can avoid the damage induced by excessive drive displacement during the manipulation. A zero-stiffness mechanism is realized by connecting the negative-stiffness mechanism and positive-stiffness mechanism in parallel. The negative stiffness is obtained by a bistable beam mechanism...
This paper proposes a novel controller to compensate for both the vibration and nonlinear hysteresis of a microgripper driven by piezoelectric actuators. The proposed control strategy includes two parts. The first part is an adaptive algorithm based on iterative learning control, and the second one is a feedback controller constructed by discrete-time sliding mode control. ILC has great properties...
This paper presents the design, modelling, and finite-element analysis of a new flexure-based compliant rotary stage dedicated to precision micropositioning application. As compared with previous work, the designed new rotary stage offers a larger rotational angle and more compact size. Based on the established analytical models, the dominant parameters of the stage are determined to satisfy the performance...
In this paper, an autonomous cell injection system based on vision and motion control is proposed for automatic batch injection of suspended biological cells. A plate for accommodating cells is specifically designed to hold and fix the suspended cells. The plate is fixed in a two-axis compliant micropositioning stage to transport cells to pre-planed positions. The cells are located using image-based...
This paper presents the design of a compact flexure-based parallel-kinematics XY precision positioning stage with constant-force output. One uniqueness of the stage is that it can produce a constant output force without using a force controller. The stage mechanism is devised using leaf flexures to achieve decoupled structures with positive stiffness. Bistable beams are used as negative-stiffness...
In this paper, the design and testing of a micro-syringe pump is carried out for precision delivery of liquid inside a tiny tube. A single-axis micro-motion pump is designed by using flexure mechanisms for precision drive of the micro-syringe. Based on the required specifications of travel range and load capability, a compliant translational motion mechanism is developed. The machine parameters are...
The conceptual design of a novel compliant microelectromechanical systems (MEMS)-based gripper equipped with elecrothermal actuating as well as electrothermal force sensing is introduced in this paper. By this design combination, the device possesses some unique characteristics including a small and compact footprint size, and a large and steady force from the thermal actuator. Simulation results...
This paper reports on a conceptual design for a modular XYZ micro/nano-positioning stage by employing bridge amplified flexure mechanism and piezoelectric actuators. The mechanism design and analysis of a new terse parallel flexure stage with three translational degrees-of-freedom (DOF) is presented. The FEA simulation of dynamics analysis and fatigue analysis are conducted to reveal the capacity...
This paper presents the design of a compact flexure-based parallel-kinematics precision positioning stage with constant force output. The stage mechanism is devised using multistage compound parallelogram flexures (MCPFs) to achieve decoupled and positive-stiffness structures. Bistable beams are used to design negative-stiffness structure. Four bistable beams and six MCPFs are combined together as...
In this paper, an innovative controller is proposed to compensate for both the nonlinear hysteresis and the vibration dynamics effects of a nanopositioning stage driven by piezoelectric actuators. With the increasing of operating bandwidth and range, large positioning errors are produced because of the hysteresis, vibration, external disturbance and noise, as well as uncompleted modeled dynamic errors...
This paper presents a new adaptive sliding mode control (ASMC) scheme with uncertainty and disturbance estimation (UDE) technique dedicated to precise motion tracking control of a piezoelectrically actuated nanopositioning stage. Unlike the conventional SMC scheme based on a discontinuous control, a smooth control action is devised based on UDE method to eliminate the use of nonlinear switching action...
This paper presents the design of a compliant constant force output gripper mechanism. The function of constant force output is achieved by using the negative stiffness effect of a buckled fixed-guided beam. One advantage is that it can eliminate the needs of complicated force-displacement combined control algorithm. Details of the nonlinear design process have been demonstrated. ANSYS APDL and MATLAB...
This paper presents a new piezo-driven cell injection system with integration of force and position control. The challenge of smooth transition between the force and position switching control is addressed by a weight coefficient method. Adaptive sliding mode control algorithm is adopted to tackle the nonlinear hysteresis and disturbance of piezoelectric actuator. Experiments are undertaken with NI...
In this paper, an innovative motion controller is proposed to compensate for both the nonlinear hysteresis and the vibration dynamics effects of a nanopositioning stage driven by piezoelectric actuators. With the increasing of operating bandwidth and motion range, large positioning errors are produced because of the hysteresis, vibration, external disturbance and noise, as well as uncompleted modeled...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.