A new type of a direct-drive valve system driven by a piezostack actuator and sliding spool

2014 ◽  
Vol 23 (7) ◽  
pp. 075002 ◽  
Author(s):  
Juncheol Jeon ◽  
Chulhee Han ◽  
Young-Min Han ◽  
Seung-Bok Choi
Keyword(s):  
Direct Drive ◽  
Valve System ◽  
New Type ◽  
Piezostack Actuator

scholarly journals A Piezoelectric Actuator-Based Direct-Drive Valve for Fast Motion Control at High Operating Temperatures

2018 ◽  
Vol 8 (10) ◽  
pp. 1806 ◽  
Author(s):  
Chulhee Han ◽  
Seung-Bok Choi ◽  
Young-Min Han
Keyword(s):  
High Temperatures ◽  
Piezoelectric Actuator ◽  
Input Voltage ◽  
Direct Drive ◽  
Valve System ◽  
System A ◽  
Different Temperatures ◽  
Hydraulic Cylinders ◽  
Fast Motion ◽  
Piezostack Actuator

This paper experimentally investigates the control performances of a piezostack actuator direct-drive valve (PADDV) operating at high temperatures. In this study, the PADDV system is designed based on special specifications featuring a high operating temperature (150 °C) and wide control bandwidth (200 Hz). After manufacturing the PADDV with design limitations such as size and maximum input voltage to the piezostack actuator, the displacement of a spool located inside the valve system, which is directly related to the flow rate, is controlled at several different temperatures and motion frequencies. In order to undertake this, the PADDV system is installed inside a heat chamber equipped with air vessels and pneumatic–hydraulic cylinders. The piezoelectric actuator is partially insulated using an aerogel to prevent permanent damage due to high temperatures above 120 °C, which is higher than the Curie temperature. To control the valve system, a PID (proportional–integral–derivative) controller is realized in which control gains are properly tuned using fuzzy logic according to the change of temperature and frequency. It is shown from the experimental results that the proposed PADDV with thermal insulation can provide the target dynamic motion of 200 Hz at 150 °C by implementing the fuzzy-based PID controller.

Control performances of a piezoactuator direct drive valve system at high temperatures with thermal insulation

2016 ◽  
Vol 25 (9) ◽  
pp. 097003 ◽  
Author(s):  
Yung-Min Han ◽  
Chulhee Han ◽  
Wan Ho Kim ◽  
Ho Yong Seong ◽  
Seung-Bok Choi
Keyword(s):  
High Temperatures ◽  
Thermal Insulation ◽  
Direct Drive ◽  
Valve System

A Robotic “Jack Spring”™ for Ankle Gait Assistance

2005 ◽  
Author(s):  
Kevin W. Hollander ◽  
Thomas G. Sugar ◽  
Donald E. Herring
Keyword(s):  
Peak Power ◽  
Energy Requirements ◽  
Linear Actuator ◽  
Direct Drive ◽  
Structure Control ◽  
New Type ◽  
Power And Energy ◽  
The Ideal

A Robotic ‘Jack Spring’™ is a new type of mechanical actuator, which is based upon the concept of structure control. A Jack Spring™ mechanism is used to create an adjustable Robotic Tendon, which is a spring based linear actuator in which the properties of a spring are crucial to its successful use in gait assistance. Like its human analog, the adjustable Robotic Tendon uses its inherent elastic nature to reduce both peak power and energy requirements for its motor. In the ideal example, peak power required of the motor for ankle gait is reduced from 250W to just 81 W. In addition, ideal energy requirements are reduced from nearly 36 Joules to just 25 Joules per step. Using this approach, an initial prototype is expected to provide 100% of the power and energy neccessary for ankle gait in a compact 0.84kg package. This weight is 8 times less than that predicted for an equivalent direct drive approach.

Kinematics and Dynamics Simulation of a New Type Direct-Drive NC Turret Tool Post

2013 ◽  
Vol 325-326 ◽  
pp. 247-251
Author(s):  
Yuan Xing Dai ◽  
Tian Rui Zhang ◽  
Xue Wei Zhang ◽  
Tian Biao Yu
Keyword(s):  
Axial Load ◽  
3D Model ◽  
Dynamics Simulation ◽  
Kinematics And Dynamics ◽  
Clamping Force ◽  
Actual Situation ◽  
Direct Drive ◽  
Kinematics Simulation ◽  
Motion Process ◽  
New Type

Building 3D model for a new type direct-drive NC Turret tool post, and introduce the model into ADAMS for further kinematics and dynamics simulation. In the kinematics simulation, observing the motion process of the direct-drive NC turret tool post and plots the trajectory of moving parts to a curve. Simulate the force condition of the NC turret tool post in actual situation, calculate the axial load and verify the clamping force in dynamics simulation.

Design of a new mechanism for jetting dispenser featuring piezoactuator

2008 ◽  
Vol 222 (4) ◽  
pp. 711-722 ◽  
Author(s):  
Q H Nguyen ◽  
Y M Han ◽  
S B Choi ◽  
S M Hong
Keyword(s):  
Experimental Test ◽  
Electronic Packaging ◽  
Dynamic Behaviour ◽  
Dynamic Models ◽  
Dynamic Modelling ◽  
Design Parameters ◽  
Mechanical Part ◽  
New Type ◽  
Static Modelling ◽  
Piezostack Actuator

This work presents both the static and dynamic models for a new type of jetting dispenser featuring a piezostack actuator, which is applicable to electronic packaging assembly. After describing the configuration of the dispensing mechanism and operational principle of the proposed piezostack-driven jetting dispenser, a static modelling for mechanical part is analysed by considering the piezostack behaviour, fluid compressibility, and structural deflection. Both linear and non-linear behaviours of the structural plate are analysed and incorporated. The dynamic modelling of the mechanical part is also performed by considering the dynamic behaviour of the piston and needle. After optimizing the design parameters, such as piston radius and so on, the behaviour of the needle motion is obtained and checked for adhesive dispensing applicability. In order to demonstrate the effectiveness of the proposed static and dynamic models, an experimental test is undertaken by showing needle displacement.

A New Type of Servo Direct Drive Turret Punch Press

2010 ◽  
Vol 139-141 ◽  
pp. 752-757 ◽  
Author(s):  
Kai He ◽  
Jiu Hua Li ◽  
Xie Feng Ou ◽  
Ru Xu Du
Keyword(s):  
Inverse Kinematics ◽  
Static Force ◽  
Kinematics Analysis ◽  
Direct Drive ◽  
Force Analysis ◽  
Output Force ◽  
Working Capability ◽  
New Type ◽  
Production Requirement ◽  
Punch Press

A new type of servo direct drive turret punch press is presented. A servomotor to drive the eccentric-toggle mechanism is used in our design, which combines the advantages of mechanical and hydraulic turret punch press. The displacement, velocity, and acceleration of the punch are calculated, through the kinematics analysis. So, the motion of the punch is controllable through the rotation of the servomotor. Then, the inverse kinematics analysis is studied in detail, and the corresponding motion of the servomotor can be gotten, for different punch motion curves, according to the production requirement. For example, when we design a motion of the punch for a particular stamping process, the motion of servomotor can be obtained through the inverse kinematics analysis. Finally, Output force is acquired by static force analysis, which decides the working capability of the mechanism.

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