Shaped phase-plane control for flexible structures with friction

2002 ◽  
Author(s):  
C. La-orpacharapan ◽  
L.Y. Pao
Keyword(s):  
Phase Plane ◽  
Flexible Structures ◽  
Phase Plane Control

A frequency domain stability analysis of a phase plane control system

1985 ◽  
Vol 8 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Alexander N. Penchuk ◽  
Philip D. Hattis ◽  
Edward T. Kubiak
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Frequency Domain ◽  
Phase Plane ◽  
Domain Stability ◽  
Phase Plane Control

Shaped Time-Optimal Feedback Controllers for Flexible Structures

2004 ◽  
Vol 126 (1) ◽  
pp. 173-186 ◽  
Author(s):  
Lucy Y. Pao ◽  
Chanat La-orpacharapan
Keyword(s):  
Phase Plane ◽  
Closed Loop ◽  
Flexible Structures ◽  
Input Shaping ◽  
Feedback Controllers ◽  
Control Laws ◽  
Loop Control ◽  
Flexible Mode ◽  
Time Optimal ◽  
Acceleration And Deceleration

This paper describes the design of closed-loop control laws for servomechanisms with one dominant flexible mode. An input shaping technique is employed to alter the rigid body phase-plane trajectory that is used in time-optimal servomechanisms. The resulting controllers lead to near time-optimal performance without unwanted residual vibrations. After the basic technique is outlined for a system with one undamped flexible mode, extensions are given considering different acceleration and deceleration capabilities, damping, and slew rate limits.

Phase Plane Control for Small Launch Vehicle

2013 ◽  
Vol 19 (6) ◽  
pp. 1641-1645
Author(s):  
Ping Sun ◽  
Hongtao Zhao
Keyword(s):  
Phase Plane ◽  
Launch Vehicle ◽  
Phase Plane Control

Stability Analysis of A Class of Second-Order Phase Plane Control Systems: A Simulation Study

2021 ◽  
Author(s):  
Zhihua Chen ◽  
Yongchun Xie ◽  
Yong Guo ◽  
Kai Zhang ◽  
Jinhua Guo ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Control Systems ◽  
Simulation Study ◽  
Phase Plane ◽  
Second Order ◽  
Phase Plane Control

Progress in high-resolution CRYO-SEM imaging of viral particles

1996 ◽  
Vol 54 ◽  
pp. 818-819
Author(s):  
Ya Chen ◽  
Geoffrey Letchworth ◽  
John White
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Structural Information ◽  
Signal To Noise Ratio ◽  
Flexible Structures ◽  
Simian Virus ◽  
Topographic Features ◽  
Viral Particles ◽  
Scanning Electron

Low-temperature high-resolution scanning electron microscopy (cryo-HRSEM) has been successfully utilized to image biological macromolecular complexes at nanometer resolution. Recently, imaging of individual viral particles such as reovirus using cryo-HRSEM or simian virus (SIV) using HRSEM, HV-STEM and AFM have been reported. Although conventional electron microscopy (e.g., negative staining, replica, embedding and section), or cryo-TEM technique are widely used in studying of the architectures of viral particles, scanning electron microscopy presents two major advantages. First, secondary electron signal of SEM represents mostly surface topographic features. The topographic details of a biological assembly can be viewed directly and will not be obscured by signals from the opposite surface or from internal structures. Second, SEM may produce high contrast and signal-to-noise ratio images. As a result of this important feature, it is capable of visualizing not only individual virus particles, but also asymmetric or flexible structures. The 2-3 nm resolution obtained using high resolution cryo-SEM made it possible to provide useful surface structural information of macromolecule complexes within cells and tissues. In this study, cryo-HRSEM is utilized to visualize the distribution of glycoproteins of a herpesvirus.

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