On the Design of a Novel Controllable Mechanical Metal Forming Press Based on 2-DOF Planar Mechanism

2005 ◽  
Author(s):  
Zhenlin Jin ◽  
Kai He ◽  
R. Du
Keyword(s):  
Metal Forming ◽  
Energy Efficient ◽  
Experimental Testing ◽  
Ball Screw ◽  
Distribution Analysis ◽  
Planar Mechanism ◽  
Step Motion ◽  
The Press ◽  
New Type ◽  
And Control

It is known that the punch motion has a significant effect on sheet metal stamping operations. For example, for deep drawing operations long dwelling is desirable. For blanking operations, on the other hand, the two-step motion can reduce the noise [1]. However, the controlled punch motion cannot be realized using conventional mechanical presses, which has the advantage of being energy efficient, fast and easier to make / maintain. Servo mechanical presses solved some of the problems, but are not energy efficient (because they cannot use flywheels as the conventional mechanical presses). Following our previous research [2–4], this paper presents a new type of controllable mechanical press. It is a 2-DOF planar mechanism driven by a large constant speed motor (which takes 75% of the load) and a small servomotor (which takes 25% of the load). Though, unlike the first design, the new design uses the servomotor to drive a ball screw instead of a crank, which makes building the press simpler and controlling the press easier. The paper describes various issues in designing and controlling the press including (a) Kinematics and inverse kinematics; (b) Static force distribution analysis and parameter design; and (c) Punch motion programming and control. A 250 KN prototype has been built and the experimental testing results confirm that the press is working properly. Comparing to the existing technology, the new press is controllable and energy efficient. It is expected that it will have a significant value to the metal forming industry.

Design and Control of Active Magnetic Bearing System With Lorentz Force Type Axial Actuator

2003 ◽  
Author(s):  
Ha-Yong Kim ◽  
Chong-Won Lee
Keyword(s):  
High Performance ◽  
Permanent Magnets ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Distribution Analysis ◽  
New Type ◽  
Radial Forces ◽  
Space Limitation ◽  
Amb System ◽  
And Control

As the size of 5-axis active magnetic bearing (AMB) gets smaller, the space limitation for installation of axial magnetic bearing unit becomes stringent. In this paper, a new type of compact, high-performance 5-axis AMB with solid cores and rotor is proposed, which consists of four permanent magnets, four U-shaped cores and 16 control coils. The proposed homopolar AMB system is levitated by the Lorentz type axial as well as Maxwell type radial forces. Based on the magnetic flux distribution analysis, the control algorithm is designed to account for the coupled effect between the radial and axial control fluxes. Experiments are also carried out with a prototype AMB system to validate the new design concept.

A New Type of Controllable Mechanical Press: Motion Control and Experiment Validation

2004 ◽  
Vol 127 (4) ◽  
pp. 731-742 ◽  
Author(s):  
W. Z. Guo ◽  
K. He ◽  
K. Yeung ◽  
R. Du
Keyword(s):  
Motion Control ◽  
Metal Forming ◽  
Variable Speed ◽  
The Press ◽  
Experiment Validation ◽  
Mechanical Press ◽  
New Type ◽  
Key Dimensions ◽  
Angular Displacements ◽  
The Relationship

This paper is the second part of our study on designing a new type of metal forming press. In the first part of the study (Du, R., and Guo, W. Z., 2003, ASME J. Mech. Des., 125(3), pp. 582–592), a new controllable mechanical press is introduced that consists of a large constant-speed motor (CSM) and a small variable-speed servomotor (VSM). The CSM provides up to 80% of the power while the VSM tunes the motion of the ram. This new design has a number of advantages: it is flexible (i.e., its ram motion is programable), fast (its speed is limited only by the mechanical motion), and energy efficient (the CSM can use a large flywheel to ease the large instantaneous metal forming force). This paper focuses on the motion control and experiment validation. First, the inverse kinematics is presented, which gives the relationship between the ram travel and (i) the input angular displacements, velocities, and accelerations of the two motors. Next, a trajectory-planning method is given. Then, the sensitivity analysis is carried out, which helps to determine the key dimensions of the press and the error compensation scheme. Finally, two experiments are shown to demonstrate that the new press can accomplish different tasks.

Performance of 4G-LTE Communication and Navigation System in Blended Wing-Body UAS

2019 ◽  
Vol 8 (4) ◽  
pp. 9538-9542
Keyword(s):  
Satellite Communication ◽  
Line Of Sight ◽  
Multiple Factors ◽  
The World ◽  
New Type ◽  
Blended Wing Body ◽  
4G Lte ◽  
The Right ◽  
And Control ◽  
Technology Demonstrator

In vision of searching for the right Unmanned Aerial System (UAS) for a specific mission, there are multiple factors to be considered by the operator such as mission, endurance, type of payload and range of the telemetry and control. This research is focusing on extending control range of the UAS by using 4G-LTE network to enable beyond-line-of-sight flying for the commercial UAS. Major UAS such Global Hawk, Predator MQ-1 are able to fly thousands of kilometers by the use of satellite communication. However, the satellite communication annual license subscription can be very expensive. With this situation in mind, a new type of flight controller with 4G-LTE communication has been developed and tested. Throughout the research, blended-wing-body (BWB) Baseline B2S is used as the platform for technology demonstrator. Result from this analysis has proven that the proposed system is capable to control a UAS from as far as United Kingdom, with a latency less than 881 ms in average. The new added capability can potentially give the commercial UAS community a new horizon to be able to control their UAS from anywhere around the world with the availability of 4G-LTE connection

Development and Control of a Compliant Asymmetric Antagonistic Actuator for Energy Efficient Mobility

2016 ◽  
Vol 21 (2) ◽  
pp. 1080-1091 ◽  
Author(s):  
Wesley Roozing ◽  
Zhibin Li ◽  
Gustavo A. Medrano-Cerda ◽  
Darwin G. Caldwell ◽  
Nikos G. Tsagarakis
Keyword(s):  
Energy Efficient ◽  
And Control

Design and analysis of a novel seven-bar mechanical servo press with dual motors inputs

2016 ◽  
Vol 231 (20) ◽  
pp. 3855-3865
Author(s):  
Chen Liu ◽  
Sheng-Dun Zhao ◽  
Jing-Xiang Li
Keyword(s):  
Metal Forming ◽  
Theoretical Study ◽  
High Capacity ◽  
High Ratio ◽  
Measured Data ◽  
Servo Motor ◽  
Symmetric Structure ◽  
Servo Press ◽  
The Press ◽  
Dynamic Analyses

This paper proposes a novel high capacity servo press system with two servo motor inputs and high ratio force amplifier mechanism for metal forming. First, the press structure was expressed. The force amplifier was made of seven-bar mechanism which possesses quick-return character and high ratio force amplifier. The symmetric structure balanced the force in horizontal direction, and dispersed the forces on two transmission routes. In theoretical study of the new structure, kinematic and dynamic analyses were obtained by examining the geometry of the structure. The performance of press was discussed by example demonstration. Finally, the kinematic experiments and metal forming experiments were carried out on the prototype machine by using grating scale system. The measured data match the theoretical calculation well, which validates the feasibility of this new press mechanism.

Application of Load Sensing Technology in New Type of Steel Arch Installing Machine

2013 ◽  
Vol 655-657 ◽  
pp. 1456-1459
Author(s):  
Li Ping Xu ◽  
Chen Fei Zhan ◽  
De Zhi Ren
Keyword(s):  
Energy Efficient ◽  
Hydraulic System ◽  
Control Performance ◽  
Multiple Fault ◽  
Type Steel ◽  
Load Sensing ◽  
Sensing Technology ◽  
New Type ◽  
Actuator Control

Because ordinary hydraulic system exists multiple fault, power waste and hard controlling in actuators due to the complexity of actuators and variability of load. A new hydraulic system based on the load sensing technology is designed for the new type steel arch installing machine. The results of the simulation for forearm loop based on AMESim show that the designed hydraulic system is energy-efficient and load sensing function is effectively achieved, the actuator control performance is well.

Study on Novel Automatic Steel Bundling Machine Pneumatic Control System

2012 ◽  
Vol 490-495 ◽  
pp. 594-597
Author(s):  
Cheng Qun Li ◽  
Liang Gao
Keyword(s):  
Control System ◽  
Control Program ◽  
Control Flow ◽  
Pneumatic Control ◽  
The Core ◽  
New Type ◽  
Action Process ◽  
And Control

This paper introduces a new type of automatic steel bundling machine for bundling process, which includes a pneumatic action process, mainly do some researches on the pneumatic control system. The system chooses PLC as the core control component, puts forward the hardware of control system and control flow. Eventually we have been designed the control program.

Development of a biped walking robot actuated by a closed-chain mechanism

Robotica ◽  
2005 ◽  
Vol 24 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Hyeung-Sik Choi ◽  
Yong-Heon Park
Keyword(s):  
High Strength ◽  
Gear Ratio ◽  
Ball Screw ◽  
Walking Robot ◽  
Biped Walking ◽  
Link Mechanism ◽  
Closed Chain ◽  
Tracking Ability ◽  
New Type ◽  
Biped Walking Robot

We developed a new type of a human-sized BWR (biped walking robot) driven by the closed-chain type of a joint actuator. Each leg of the BWR is composed of three pitch joints and one roll joint. In all, a 12 degree-of-freedom robot, including four arm joints, was developed. The BWR was designed to walk autonomously; it is actuated by small 90W DC motors/drivers and is has DC batteries and controllers. A new type of the joint actuator for the BWR is composed of the four-bar-link mechanism driven by a ball screw which has high strength and high gear ratio despite its light weight.In this paper, analyses on the four-bar-link mechanism applied to the joint actuator and on the structure of the BWR are presented. Through walking experiments of the BWR, the superior trajectory-tracking ability of the proposed joint actuator is validated.

Sign in / Sign up

Export Citation Format

Share Document