scholarly journals Report on Task USA A 0931 (A.252) Implementation of Fast, Front-End Electronics for Improved Low-Dead Time Neutron Counting

2019 ◽  
Author(s):  
Metodi Iliev ◽  
Kiril Dimitrov Ianakiev
Keyword(s):  
Dead Time ◽  
Front End ◽  
Neutron Counting

An ISOBUS-Networked Electronic Self-Leveling Controller for the Front-End Loader of an Agricultural Tractor

2017 ◽  
Vol 33 (6) ◽  
pp. 757-767 ◽  
Author(s):  
Chang-Joo Lee ◽  
Hak-Jin Kim ◽  
Jong-Woo Ha ◽  
Bong-Jin Cho ◽  
Duk-Soo Choi
Keyword(s):  
Dead Time ◽  
Electronic Control Unit ◽  
Ground Surface ◽  
Control Unit ◽  
Information And Communications Technology ◽  
Bench Test ◽  
Electronic Control ◽  
Hydraulic Systems ◽  
Velocity Feedback ◽  
Front End

Abstract. There has been a growing trend toward electronic control of hydraulic systems in agricultural machinery to improve operator comfort. Rapid advances in information and communications technology and the expansion of agricultural attachments have led to the introduction of control systems following the ISOBUS standard. Feedback control of a front-end loader (FEL) using electro-hydraulic proportional valves and sensors allows automatic activation of the boom and bucket cylinders and repetitive operational sequences of FEL functions. The mechanical self-leveling systems commonly used to prevent rollback have a limited range of operation and provide overcompensation beyond that range, therefore requiring considerable driver attention when operating the FEL. This article describes the development and evaluation of an ISOBUS-networked electronic self-leveling system that uses three electronic control units (ECUs), i.e., loader, joystick, and virtual terminal ECUs, to automatically adjust the orientation of the loader bucket with respect to the ground based on real-time measurements of bucket angle and angular velocity. Key improvements to the system, compared to a previous study that developed a proportional and integral (PI)–based self-leveling controller include the addition of a velocity feedback element and a dead-time effect computation to the control loop. An embedded electronic controller was implemented on agricultural tractors to test its ability to maintain the desired bucket angle regardless of varying ground slopes or the lifting or lowering motion of the boom. In laboratory testing with a FEL simulator, the use of the velocity feedback loop enabled the bucket angles to reach reference angles of +20°, showing reductions in rise times from 0.75 to 0.51 s and from 0.84 to 0.39 s on ascending and descending slopes, respectively, compared to the PI-based self-leveling algorithm. At a traveling velocity of 2.5 km/h, there was little change in bucket angle, with an almost constant level of <1°. However, at a velocity of 7.5 km/h, inflection points on the paved road caused relatively large deviations from the reference angle ranging from 3° to 5°, thus requiring the use of a look-ahead method to predict sudden changes in slope using a LIDAR sensor that can characterize the ground surface. In an outdoor bench test using a joystick to raise and lower the boom of a FEL, the self-leveling algorithm allowed the bucket angle to be maintained at the desired level, with RMSEs of 2.1±0.65° and 3.4±0.81° in the raising and lowering modes, respectively; thus, it could be implemented in an electronic self-leveling system for a FEL, which could then be employed in an ISOBUS-networked tractor offering the potential to eliminate the possibility of load rollback. Keywords: Dead-time computation, Electro-hydraulic proportional valve, Electronic control unit, Front-end loader, ISOBUS, Self-leveling, Velocity feedback.

scholarly journals Estimating the effective system dead time parameter for correlated neutron counting

2017 ◽  
Vol 871 ◽  
pp. 154-160 ◽  
Author(s):  
Stephen Croft ◽  
Steve Cleveland ◽  
Andrea Favalli ◽  
Robert D. McElroy ◽  
Angela T. Simone
Keyword(s):  
Dead Time ◽  
Time Parameter ◽  
Neutron Counting ◽  
Effective System

Dead-time free pixel readout architecture for ATLAS front-end IC

1999 ◽  
Vol 46 (3) ◽  
pp. 166-170 ◽  
Author(s):  
K. Einsweiler ◽  
A. Joshi ◽  
S. Kleinfelder ◽  
L. Luo ◽  
R. Marchesini ◽  
...  
Keyword(s):  
Dead Time ◽  
Front End

scholarly journals A LOW DEAD-TIME NEUTRON-COUNTING SYSTEM

1961 ◽  
Author(s):  
R.J. Epstein ◽  
D.C. Thompson
Keyword(s):  
Dead Time ◽  
Counting System ◽  
Neutron Counting

scholarly journals Measurement of the front-end dead-time of the LHCb muon detector and evaluation of its contribution to the muon detection inefficiency

2016 ◽  
Vol 11 (04) ◽  
pp. P04010-P04010
Author(s):  
L. Anderlini ◽  
M. Anelli ◽  
F. Archilli ◽  
G. Auriemma ◽  
W. Baldini ◽  
...  
Keyword(s):  
Dead Time ◽  
Muon Detector ◽  
Front End ◽  
Muon Detection

scholarly journals Design and Test of a 65nm CMOS Front-End with Zero Dead Time for Next Generation Pixel Detectors

2018 ◽  
Author(s):  
Davide Braga ◽  
Luigi Gaioni ◽  
David Charles Christian ◽  
Grzegorz Deptuch ◽  
Farah Fahim ◽  
...  
Keyword(s):  
Dead Time ◽  
Next Generation ◽  
Front End ◽  
Pixel Detectors

Dead-time free pixel readout architecture for ATLAS front-end IC

2002 ◽  
Author(s):  
K. Einsweiler ◽  
A. Joshi ◽  
S. Kleinfelder ◽  
L. Luo ◽  
R. Marchesini ◽  
...  
Keyword(s):  
Dead Time ◽  
Front End
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