scholarly journals Real-Time Monitoring Method for Layered Compaction Quality of Loess Subgrade Based on Hydraulic Compactor Reinforcement

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4288 ◽  
Author(s):  
Tianyu Xu ◽  
Zhijun Zhou ◽  
Ruipeng Yan ◽  
Zhipeng Zhang ◽  
Linxuan Zhu ◽  
...  
Keyword(s):  
Real Time ◽  
Quadratic Function ◽  
Mobile Terminal ◽  
Elastic Half Space ◽  
Real Time Monitoring ◽  
Force Coefficient ◽  
Monitoring Method ◽  
Loess Area ◽  
The Relationship

Hydraulic compactor is an efficient reinforcement machine for loess subgrade. However, it is difficult to control the layered compaction quality of the subgrade. This research presents a real-time layered compactness monitoring method for hydraulic compactor reinforcement of subgrade in loess areas. The hydraulic force coefficient is first introduced, and the dynamic response model of the hydraulic rammer and soil is established. The relationship between the acceleration of the hydraulic rammer and the compactness of subgrade is then obtained based on the collision theory in elastic half space. A full-scale test using a hydraulic compactor to reinforce loess subgrade was also carried out. Results show that the hydraulic compactor obtains the effective influence depth for the reinforcement of loess subgrade. Within the effective reinforcement depth, the relationship between the peak acceleration of the rammer and the layered compactness of subgrade can be well fitted by a quadratic function model. The layered compactness of the subgrade and the working state of the hydraulic compactor can then be remotely monitored at a mobile terminal in real time. Furthermore, the monitoring technology was applied to Huangling-Yan’an Expressway in China, significantly improving the accuracy and efficiency of real-time monitoring of the layered compactness of subgrade in the loess area.

A measurement method for the overturning coefficient of high-speed trains passing through complex terrain sections under strong wind conditions

2019 ◽  
Vol 234 (8) ◽  
pp. 885-895
Author(s):  
Zhaijun Lu ◽  
Weijia Huang ◽  
Mu Zhong ◽  
Dongrun Liu ◽  
Tian Li ◽  
...  
Keyword(s):  
Real Time ◽  
Complex Terrain ◽  
High Speed ◽  
Suspension System ◽  
Strong Wind ◽  
Real Time Monitoring ◽  
Monitoring Method ◽  
High Speed Trains ◽  
Strong Winds ◽  
Pass Through

Real-time monitoring of overturning coefficients is very important for ensuring the safety of high-speed trains passing through complex terrain sections under strong wind conditions. In recent years, the phenomenon of “car swaying” that occurs when trains pass through the complex terrain has brought new challenges to ensuring the safety and riding comfort of passengers. In China, more and more high-speed trains are facing strong wind environments when running in complex terrain sections. However, due to the limitation of objective conditions, so far, only a few economical and effective methods of measurement have been developed that are suitable for real-time monitoring of the overturning coefficient of commercial vehicles. Therefore, considering the applicability and universality of such a monitoring method, this study presents a method for measuring the overturning coefficient of trains using the primary suspension system under strong winds. A vehicle test was carried out to verify the accuracy of the method. The results show that after correction, the overturning coefficient obtained from the primary suspension system is generally consistent with the overturning coefficient obtained from the instrumented wheelset. The method of measuring the overturning coefficient of trains in strong wind environments with the primary suspension system is, thus, proven feasible.

scholarly journals Real-Time Monitoring System for Shelf Life Estimation of Fruit and Vegetables

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1860 ◽  
Author(s):  
Roque Torres-Sánchez ◽  
María Teresa Martínez-Zafra ◽  
Noelia Castillejo ◽  
Antonio Guillamón-Frutos ◽  
Francisco Artés-Hernández
Keyword(s):  
Environmental Factors ◽  
Shelf Life ◽  
Real Time ◽  
Monitoring System ◽  
Rating Scales ◽  
Storage Temperature ◽  
Postharvest Quality ◽  
Real Time Monitoring ◽  
Perishable Product

The control of the main environmental factors that influence the quality of perishable products is one of the main challenges of the food industry. Temperature is the main factor affecting quality, but other factors like relative humidity and gas concentrations (mainly C2H4, O2 and CO2) also play an important role in maintaining the postharvest quality of horticultural products. For this reason, monitoring such environmental factors is a key procedure to assure quality throughout shelf life and evaluate losses. Therefore, in order to estimate the quality losses that a perishable product can suffer during storage and transportation, a real-time monitoring system has been developed. This system can be used in all post-harvest steps thanks to its Wi-Fi wireless communication architecture. Several laboratory trials were conducted, using lettuce as a model, to determine quality-rating scales during shelf life under different storage temperature conditions. As a result, a multiple non-linear regression (MNLR) model is proposed relating the temperature and the maximum shelf life. This proposed model would allow to predict the days the commodities will reduce their theoretical shelf-life when an improper temperature during storage or in-transit occurs. The system, developed as a sensor-based tool, has been tested during several land transportation trips around Europe.

Magnetoelastic Viscosity Sensor for Lubricant Oil Condition Monitoring

2011 ◽  
Vol 495 ◽  
pp. 71-74
Author(s):  
I. Bravo-Imaz ◽  
A. García-Arribas ◽  
E. Gorritxategi ◽  
M. Hernaiz ◽  
A. Arnaiz ◽  
...  
Keyword(s):  
Real Time ◽  
Condition Monitoring ◽  
Environmental Issues ◽  
Real Time Monitoring ◽  
Oil Viscosity ◽  
Lubricant Oil ◽  
On Line ◽  
Magnetoelastic Materials ◽  
Working Device

Actual trends in machinery maintenance point to the necessity of an on-line real-time monitoring of the condition of the lubricant oil. Excessive delay in replacing the lubricant oil can have catastrophic results, whereas doing it too early produces evident economic and environmental issues. Magnetoelastic materials offer a good sensing principle for assessing lubricant oil viscosity; which is one of the most important properties to assure its proper lubricant capacity. Among others, one of the most remarkable properties of this sensing principle is the capability of being used through a wide viscosity range. In this work, we describe the experiments performed to evaluate the usefulness of this technology for testing the viscosity of different test oils in order to develop a working device for on-line, real-time monitoring the quality of lubricant oils.

Stress Real-Time Monitoring of Marine Derrick Based on Environmental Loads

2012 ◽  
Vol 226-228 ◽  
pp. 2128-2131
Author(s):  
Tao Huang ◽  
Jun Pu Wang ◽  
Fu Wan ◽  
Shao Wei Chen ◽  
Yao Dong
Keyword(s):  
Finite Element ◽  
Real Time ◽  
Engineering Application ◽  
Design Feature ◽  
Environmental Load ◽  
Real Time Monitoring ◽  
Element Analysis ◽  
Monitoring Method ◽  
Environmental Loading ◽  
Finite Element Software

Aiming at the design feature and the operating of K-type derrick, an effective method used to stress real-time monitoring consider environmental loading is proposed. The challenge to the South China Sea offshore drilling derrick is a illustration. The derrick corrosion and wall thinning conditions is be considered, then using finite element software analyze derrick structure of static analysis, get the higher force about main member of derrick. Based on finite element analysis, select the key parts layout of measuring points, then monitor derrick stress under nine storms environmental loading and extreme work condition. The measured data results show that: the nine storms environmental load affect capacity of drilling significantly, the different parts of the main member stress have the different degrees of influence by environmental load, the maximum can reach 50.8%. This real-time monitoring method of stress, can protect the safety of marine operations, has a certain value of engineering application.

Mo1540 The New Real-Time Monitoring Method Using Capsule Endoscopy for Gastrointestinal Bleeding After Endoscopic Treatment

2014 ◽  
Vol 79 (5) ◽  
pp. AB476
Author(s):  
Hayato Sasaki ◽  
Minori Matsumoto ◽  
Yasuo Kakugawa ◽  
Yutaka Saito ◽  
Taku Sakamoto ◽  
...  
Keyword(s):  
Gastrointestinal Bleeding ◽  
Real Time ◽  
Capsule Endoscopy ◽  
Endoscopic Treatment ◽  
Real Time Monitoring ◽  
Monitoring Method
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