Structural Characteristics Analysis and Optimization of Large Hydraulic Press Water Control System for Marine Engineering

2019 ◽  
Vol 94 (sp1) ◽  
pp. 332
Author(s):  
Mei Sun ◽  
Chengyan Zhang ◽  
Chaoyi Xie
Keyword(s):  
Control System ◽  
Structural Characteristics ◽  
Hydraulic Press ◽  
Water Control ◽  
Characteristics Analysis ◽  
Marine Engineering

Commissioning brownstock washing controls for an evaporator limited mill

TAPPI Journal ◽  
2016 ◽  
Vol 15 (7) ◽  
pp. 459-464
Author(s):  
RICARDO SANTOS ◽  
PETER HART
Keyword(s):  
Control System ◽  
Negative Impact ◽  
Black Liquor ◽  
Pulp Mill ◽  
Control Program ◽  
Separation Point ◽  
Water Control ◽  
Oxygen Delignification ◽  
Percentage Points

An automated shower water control system has been implemented to reduce the volume and variability of weak black liquor being sent from the pulp mill to the evaporators. The washing controls attempt to balance the need for consistent and low soda carryover to the bleach plant with consistently high weak black liquor solids being sent to the evaporators. The washer controls were implemented on two bleachable grade hardwood lines (one with oxygen delignification, one without oxygen delignification) and one pine line. Implementation of the control program resulted in an increase in black liquor solids of 0.6 percentage points for the hardwood lines. Significant foam reduction was realized on the pine line since the pine black liquor solids were able to be consistently maintained just below the soap separation point. Low black liquor solids excursions to the evaporators were eliminated. Bleach plant carryover was stabilized and no negative impact on chemical consumption was noticed when controlling weak black liquor solids to recovery.

Nutrient Input and Trophic Status of the “Neue Donau”, a High-Water Control System along the River Danube in Vienna, Austria

1990 ◽  
Vol 22 (5) ◽  
pp. 137-144 ◽  
Author(s):  
M. T. Dokulil ◽  
G. A. Janauer
Keyword(s):  
Water Quality ◽  
Control System ◽  
Trophic Status ◽  
High Water ◽  
Nutrient Concentrations ◽  
Nutrient Input ◽  
Water Control ◽  
Trophic Conditions ◽  
River Danube ◽  
High Nutrient

The system “Neue Donau” functions as a control system for high waters of the river Danube and is an important recreational area for many people. Water quality and trophic status of the water body is thereforeof prime importance. The high nutrient concentrations of the river Danube (P-tot 238±41µg/l, N-tot 2.53±0.78 mg/l) reach the system via groundwater seepage. Present conditions in the basin of Neue Donau are,as a result of this nutrient in-flux,eutrophic to hypertrophic. Average values during the summer period have declined from 366 µg/l total phosphorus to 78 µg/l, and from 86 µg/l chlorophyll-a tol7µg/l between the years 1985 and 1988. However, a dam which is planned in the river at Vienna will permanently raise the water level of the river thus increasing the the groundwater flow in the direction to the Neue Donau and therefore the nutrient input which will enhance trophic conditions in the impoundment. Since macrophytes play an important role in one part of the system macrophyte management together with measures along the river are some of the suggested strategies to keep the system Neue Donau at acceptable trophic conditions and good water quality.

Research of H∞ Robust Control for the Giant Die Forging Hydraulic Press’s Synchronous Control System under the Uncertainty Coefficient

2012 ◽  
Vol 190-191 ◽  
pp. 819-824 ◽  
Author(s):  
Ying Jian Deng ◽  
Zhong Wei Liu
Keyword(s):  
Control System ◽  
Robust Control ◽  
Control Algorithm ◽  
Hydraulic Press ◽  
National Defense ◽  
Synchronous Control ◽  
Performance Quality ◽  
System Synchronization ◽  
Uncertainty Coefficient

The giant hydraulic die press is our country national defense and the infrastructure essential equipment, the synchronous control system is the essential device to the giant forging hydraulic press, its synchronization control performance quality is good or bad will directly determine the quality of the product. This article through the proof of the theorem, gives the specific steps to achieve H∞ robust control algorithm. The simulation results show that: this control strategy has good inhibition to the change of system parameters, robustness is very strong, can well eliminate the system synchronization error.

Archaeological Operations

2018 ◽  
pp. 126-193
Author(s):  
Jonathan Kaplan ◽  
Federico Paredes Umaña
Keyword(s):  
Control System ◽  
Hierarchical Structure ◽  
Field Data ◽  
The South ◽  
Water Control ◽  
Long Distance ◽  
The North ◽  
Ancient Society ◽  
Preclassic Period

Chapter 4 abstracts and summarizes the very copious field data from the three lengthy field seasons at Chocolá, including the specific evidence obtained about the very extensive water control system that was discovered. Intensive grid excavations were undertaken in five operations: Mound 15, the northernmost part of the elite north sector, Mounds 6 and 7, in the southern part of the north sector, Mound 2, in the central administrative sector, and Mound 5, in the south sector. Accordingly, our three field seasons provide the specific evidence and artifacts we have been able to use to understand the clearly hierarchical structure of the ancient society and city. Of particular importance for a better understanding of the material underpinnings of Chocolá is our research at Mound 5, in the south, where we believe cacao arboriculture was developed for long-distance trade in the Preclassic period.

Irrigation Water Compensation Control System Based on Fuzzy Neural Network

2010 ◽  
Vol 108-111 ◽  
pp. 1386-1391
Author(s):  
Bo Wu ◽  
Bang Yan Ye ◽  
Chun Ling Wu ◽  
Cheng Zhong Zhang
Keyword(s):  
Neural Network ◽  
Control System ◽  
Irrigation Water ◽  
Fuzzy Neural Network ◽  
Experimental Result ◽  
Data Sampling ◽  
Water Control ◽  
Sampling Device ◽  
Fuzzy Neural ◽  
Water Compensation

This paper presents a Fuzzy Neural Network-based irrigation water control system for realizing accurate irrigation and water saving. The control system consists of a PC based server with a FNN-based control module, data sampling device, CAN bus communication network and remote irrigation units with sensors and controller. It can estimate irrigation water compensation according to the irrigation environments. By using Fuzzy Logic function and Fuzzy Neural Network, the controller module can fuse multi-source information that from Internet, sensors and other sources to make decision of irrigation water compensation on the control spot. Experimental result indicates that the compensation generated by FNN have higher precision than that by FL in this irrigation water control system.

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