scholarly journals Development of online monitor for substation 10 kV MOA

2019 ◽  
Vol 2019 (16) ◽  
pp. 701-704
Author(s):  
Xinming Song ◽  
Yunfeng Xia ◽  
Jianzong He ◽  
Zhidong Jia ◽  
Xilin Wang
Keyword(s):  
Online Monitor

Online Monitoring ICE Powers Based on the Crankshaft Angular Vibration

2011 ◽  
Vol 48-49 ◽  
pp. 773-778 ◽  
Author(s):  
Chun Rong Hua ◽  
Da Wei Dong ◽  
Bing Yan ◽  
Ming Heng Xu
Keyword(s):  
Reference Point ◽  
Online Monitoring ◽  
Vibration Mode ◽  
Vibration Displacement ◽  
Rotating Speed ◽  
Rigid Body Model ◽  
Angular Vibration ◽  
Cubic Polynomial ◽  
Experimental Researches ◽  
Online Monitor

A new method of online monitoring ICE powers based on the crankshaft angular vibration is proposed. It has deduced that when each cylinder works uniformly at a certain rotating speed, and the vth order angular vibration mode of crankshaft nears plane vibration mode such as “quasi-rigid body model” or “quasi-trapeziform model”, so a cubic polynomial can represent the relationship between the vth order angular vibration displacement amplitude of the crankshaft reference point and the engine powers, thereby the angular vibration of reference point could be used to online monitor engine powers. Through the simulation and experimental researches on a 6240 and a 4100 diesel engine, it shows that the engine powers fitted with the angular vibration displacement amplitudes of reference point are close to the measured or theoretical powers comparatively, and the maximum errors is only 2.95%, which verifies the feasibility and practicability of the method consequently.

scholarly journals Semi-continuous gas and inorganic aerosol measurements at a Finnish urban site: comparisons with filters, nitrogen in aerosol and gas phases, and aerosol acidity

2012 ◽  
Vol 12 (2) ◽  
pp. 4755-4796 ◽  
Author(s):  
U. Makkonen ◽  
A. Virkkula ◽  
J. Mäntykenttä ◽  
H. Hakola ◽  
P. Keronen ◽  
...  
Keyword(s):  
Particle Number ◽  
Road Traffic ◽  
Large Fraction ◽  
Inorganic Ions ◽  
Urban Site ◽  
Vehicle Exhaust ◽  
Gas Phases ◽  
Aerosol Acidity ◽  
Inorganic Aerosol ◽  
Online Monitor

Abstract. Concentrations of 5 gases (HCl, HNO3, HONO, NH3, SO2) and 8 major inorganic ions in particles (Cl−, NO3−, SO42−, NH4+, Na+, K+, Mg2+, Ca2+) were measured with an online monitor MARGA 2S in two size ranges, Dp < 2.5 μm and Dp < 10 μm, in Helsinki, Finland from November 2009 to May 2010. The results were compared with filter sampling, mass concentrations obtained from particle number size distributions, and a conventional SO2 monitor. The MARGA yielded lower concentrations than those analyzed from the filter samples for most ions. Linear regression yielded MARGA vs. filter slopes of 0.68, 0.89, 0.84, 0.52, 0.88, 0.17, 2.88, and 3.04 for Cl−, NO3−, SO42−, NH4+, Na+, K+, Mg2+, and Ca2+, respectively, and 0.90 for the MARGA vs. SO2 monitor. There were clear seasonal cycles in the concentrations of the nitrogen-containing gases: the median concentrations of HNO3, HONO, and NH3 were 0.09 ppb, 0.37 ppb, and 0.01 ppb in winter, respectively, and 0.15, 0.15, and 0.14 in spring, respectively. The gas-phase fraction of nitrogen decreased roughly with decreasing temperature so that in the coldest period from January to February the median contribution was 28% but in April to May 53%. There were also large fractionation variations that temperature alone cannot explain. HONO correlated well with NOx but a large fraction of the HONO-to-NOx ratios were larger than published ratios in a road traffic tunnel suggesting that a large amount of HONO had other sources than vehicle exhaust. Aerosol acidity was estimated by calculating ion equivalent ratios. The sources of acidic aerosols were studied with trajectory statistics that showed that continental aerosol is mainly neutralized and marine aerosol acidic.

Development of a Novel Comprehensive Online Monitor for MV Switchgears Based on Modbus

2018 ◽  
Author(s):  
Zhe Hou ◽  
Jingfeng Wu ◽  
Shuangzan Ren ◽  
Chuankai Yang ◽  
Chen Mao ◽  
...  
Keyword(s):  
Online Monitor

The Research of CNC Machine Monitoring System Based on OPC and Configuration

2013 ◽  
Vol 340 ◽  
pp. 809-813
Author(s):  
Ting Chen
Keyword(s):  
Machine Tool ◽  
Monitoring System ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Long Distance ◽  
Management Platform ◽  
Machine Monitoring ◽  
Opc Technology ◽  
Realtime Control ◽  
Online Monitor

At present, it is hard to integrate and monitor the CNC machine tool in enterprise produce workshop. This paper proposed one kind CNC machine monitoring system scheme based on OPC technology by analyzing OPC interface technology and MCGS technology. In this scheme, establish workshop monitoring management platform in host computer by MCGS, and realize the monitoring management to bottom CNC machine. The experiment validates the users can realize the online monitor and realtime control on long-distance CNC machine through this platform. The monitoring system has good realtime and reliable stability.

scholarly journals An online monitor of the oxidative capacity of aerosols (o-MOCA)

2017 ◽  
Vol 10 (2) ◽  
pp. 633-644 ◽  
Author(s):  
Arantzazu Eiguren-Fernandez ◽  
Nathan Kreisberg ◽  
Susanne Hering
Keyword(s):  
Oxidative Stress ◽  
Limit Of Detection ◽  
Ambient Air ◽  
Oxidative Capacity ◽  
Cellular Damage ◽  
In Vitro Assays ◽  
Time Resolved ◽  
Consumption Rates ◽  
Online Monitor

Abstract. The capacity of airborne particulate matter to generate reactive oxygen species (ROS) has been correlated with the generation of oxidative stress both in vitro and in vivo. The cellular damage from oxidative stress, and by implication with ROS, is associated with several common diseases, such as asthma and chronic obstructive pulmonary disease (COPD), and some neurological diseases. Yet currently available chemical and in vitro assays to determine the oxidative capacity of ambient particles require large samples, analyses are typically done offline, and the results are not immediate.Here we report the development of an online monitor of the oxidative capacity of aerosols (o-MOCA) to provide online, time-resolved assessment of the capacity of airborne particles to generate ROS. Our approach combines the Liquid Spot Sampler (LSS), which collects particles directly into small volumes of liquid, and a chemical module optimized for online measurement of the oxidative capacity of aerosol using the dithiothreitol (DTT) assay. The LSS uses a three-stage, laminar-flow water condensation approach to enable the collection of particles as small as 5 nm into liquid. The DTT assay has been improved to allow the online, time-resolved analysis of samples collected with the LSS but could be adapted to other collection methods or offline analysis of liquid extracts.The o-MOCA was optimized and its performance evaluated using the 9,10-phenanthraquinone (PQ) as a standard redox-active compound. Laboratory testing shows minimum interferences or carryover between consecutive samples, low blanks, and a reproducible, linear response between the DTT consumption rate (nmol min−1) and PQ concentration (µM). The calculated limit of detection for o-MOCA was 0.15 nmol min−1. The system was validated with a diesel exhaust particle (DEP) extract, previously characterized and used for the development, improvement, and validation of the standard DTT analysis. The DTT consumption rates (nmol min−1) obtained with the o-MOCA were within experimental uncertainties of those previously reported for these DEP samples. In ambient air testing, the fully automated o-MOCA was run unattended for 3 days with 3 h time resolution and showed a diurnal and daily variability in the measured consumption rates (nmol min−1 m−3).

The Remote Metrology of Water Pollution Source Online Monitor Based on 3G Technology

2013 ◽  
Vol 448-453 ◽  
pp. 371-375
Author(s):  
Yue Bing Sha ◽  
Hong He ◽  
Jian Wen Shao
Keyword(s):  
Water Pollution ◽  
Field Experiments ◽  
Pollution Source ◽  
Analog To Digital ◽  
Interaction Field ◽  
Client Software ◽  
Analog To Digital Conversion ◽  
Machine Interface ◽  
Machine Interaction ◽  
Online Monitor

In order to improve the efficiency of metrological ordinary work in water pollution source online monitor instrument and reduce the measurement personnel's labor intensity. 3G technology has been used to connect test instrument with the client's network through the study of the STM32 type microprocessor and analog-to-digital conversion to test instruments output current. DTU and 3G wireless network have been used to complete the testing data of the transmission, as well as formulate the corresponding server and client software,which perfect man-machine interface and facilitate man-machine interaction. Field experiments show that the system is stable and reliable, which can effectively meet the demand of the measurement and have a broad application prospect.

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