Design of a Closed Loop Computer Controlled System for Selective Area Laser Deposition. II. Laser Systems, Gasflow, and Substrate Temperature Control

1996 ◽  
Vol 11 (4) ◽  
pp. 703-725 ◽  
Author(s):  
W. Richards Thissell ◽  
Harris L. Marcus
Keyword(s):  
Substrate Temperature ◽  
Temperature Control ◽  
Closed Loop ◽  
Laser Deposition ◽  
Controlled System ◽  
Selective Area ◽  
Laser Systems ◽  
Computer Controlled

Elimination of membrane compliance in undrained triaxial testing.II. Mitigation by injection compensation

1993 ◽  
Vol 30 (5) ◽  
pp. 739-746 ◽  
Author(s):  
P.G. Nicholson ◽  
R.B. Seed ◽  
H.A. Anwar
Keyword(s):  
Large Scale ◽  
Closed Loop ◽  
Injection System ◽  
Triaxial Testing ◽  
Granular Soils ◽  
Confining Stress ◽  
Controlled System ◽  
Computer Controlled ◽  
Large Scale Tests ◽  
Correction System

A computer-controlled injection-correction system has been developed to continuously and completely mitigate the adverse effects of membrane compliance for undrained testing of granular soils. The system was developed with the explicit idea that it could be quickly and easily adapted to most any up to date triaxial testing apparatus. A relationship between effective confining stress and volumetric compliance can be predetermined, as volumetric-compliance errors have been shown to be a direct and repeatable function of effective confining stresses for a given material. The predetermination of volumetric-compliance errors represents a suitable basis for control of injection–removal compensation for membrane compliance during undrained testing. A closed-loop computer-controlled system continuously monitors changes in sample effective confining stresses such that precalculated volumetric-compliance errors can be continuously offset by injecting or removing volumes of water equal to those errors throughout the duration of each test. The validity of the injection system was verified by comparison of the compensated tests to results of large-scale (300 mm diameter) tests of the same materials, as compliance effects for large-scale tests of this material were negligible. Key words : membrane, penetration, compliance, undrained testing, triaxial, compensation, liquefaction.

scholarly journals Consumption of Cisatracurium in different age groups, using a closed loop computer controlled system

2014 ◽  
Vol 14 (1) ◽  
Author(s):  
Shehzaad Joomye ◽  
Donglai Yan ◽  
Haiyun Wang ◽  
Guoqiang Zhou ◽  
Guolin Wang
Keyword(s):  
Closed Loop ◽  
Age Groups ◽  
Controlled System ◽  
Computer Controlled

Direct growth of VO 2 nanoplatelets on glass and silicon by pulsed laser deposition through substrate temperature control

2017 ◽  
Vol 632 ◽  
pp. 119-127 ◽  
Author(s):  
S. Lafane ◽  
S. Abdelli-Messaci ◽  
M. Kechouane ◽  
S. Malek ◽  
B. Guedouar ◽  
...  
Keyword(s):  
Substrate Temperature ◽  
Pulsed Laser Deposition ◽  
Temperature Control ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Direct Growth

Reliability of nonlinear stochastic controlled systems considering the dynamics of sensors and actuators

2021 ◽  
pp. 107754632110037
Author(s):  
Sun Jiaojiao ◽  
Xia Lei ◽  
Ying Zuguang ◽  
Huan Ronghua ◽  
Zhu Weiqiu
Keyword(s):  
Closed Loop ◽  
First Passage Time ◽  
Hamiltonian Function ◽  
Small Time ◽  
Kolmogorov Equation ◽  
Sensors And Actuators ◽  
First Passage ◽  
Controlled System ◽  
Main Structure ◽  
Controlled Systems

A closed-loop controlled system usually consists of the main structure, sensors, and actuators. The dynamics of sensors and actuators may influence the motion of the main structure. This article presents an analytical study on the first-passage reliability of a nonlinear stochastic controlled system under the consideration of the dynamics of sensors and actuators. The coupled dynamic equations of the controlled systems with sensors and actuators are first given, which are further integrated into a controlled, randomly excited, dissipated Hamiltonian system. By applying the stochastic averaging method for quasi-Hamiltonian systems, a one-dimensional averaged differential equation for the Hamiltonian function is obtained. The backward Kolmogorov equation associated with the averaged equation is then derived for the first-passage reliability analysis, from which the approximate reliability function and probability density of first-passage time are obtained. The accuracy of the proposed procedure is demonstrated by an example. A comparative analysis of the reliability of the system with/without sensors and actuators is carried out, which indicates that ignoring sensors and actuators will make underestimation of the reliability of the closed-loop system with small time. However, when time increases, there appears the opposite trend. Our findings provide a reference for control strategy design.

The Design of Firing Mechanism Controlling Research of Natural Gas Vehicle Cylinder

2013 ◽  
Vol 333-335 ◽  
pp. 2044-2051
Author(s):  
Wei Pu Xu ◽  
Yi Ting Liu
Keyword(s):  
Natural Gas ◽  
Data Acquisition ◽  
Wireless Network ◽  
Fire Test ◽  
General Idea ◽  
Security Risks ◽  
Controlled System ◽  
Video Systems ◽  
Computer Controlled ◽  
Natural Gas Vehicle

This article described the current situation and the security risks of the natural gas vehicle cylinders, which introduced the principle of the fire test, proposed the general idea of the fire test equipment. Wireless network, video systems, data acquisition systems and computer-controlled system of the equipment researching are also introduced.

scholarly journals A Computer-Controlled System for Ice-Fabric Analysis on a Rigsby Stage

1988 ◽  
Vol 10 ◽  
pp. 92-94 ◽  
Author(s):  
Manfred A. Lange
Keyword(s):  
Tilt Angle ◽  
Ice Core ◽  
Data Bank ◽  
Integrated System ◽  
Controlled System ◽  
Thin Sections ◽  
Fabric Analysis ◽  
Data Files ◽  
Computer Controlled ◽  
Electronic Sensors

An integrated system for ice-fabric analysis on a Rigsby stage is described. The system consists of a regular Rigsby stage fitted with two opto-electronic sensors for assessment of azimuth and the tilt angle of each individual grain. Signals from the sensors are transmitted to a computer terminal via an interface box, which facilitates transformation of Gray-coded data to ASCII data records. The terminal is hooked up to a main-frame computer (VAX 750), where the digitized angles of the c-axis orientations of individual thin sections are stored in separate data files. These files are compatible with other already existing files containing additional ice-core data and thus become part of an extensive data bank. Appropriate software has been developed to produce, among other things, plots of c-axis orientations in a Schmidt net.

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