Autonomic Indoor Fire Extinguishing System

2011 ◽  
Vol 480-481 ◽  
pp. 841-844
Author(s):  
Dong Xing Wang ◽  
Su Chen
Keyword(s):  
Early Warning ◽  
Early Stage ◽  
Automated Guided Vehicle ◽  
Fire Extinguishing ◽  
Fire Extinguishing System

The most commonly used indoor fire extinguishing systems are automatic sprinkling fire extinguishing systems. However, such systems have disadvantages of difficult to maintenance and low in reliability. The design of a composite indoor fire distinguishing system has been proposed, which consists of a fixed fire early warning subsystem and a moveable fire detecting and extinguishing subsystem. The moveable fire detecting and extinguishing subsystem is established on an automated guided vehicle. The system is fully autonomic, robust, and easy to maintenance. In addition, it can promptly and precisely detect fire in its early stage, and extinguish it in time. Experiments have demonstrated that the system is applicable.

Early Warning Mechanism for the Surge of Passengers in Metro Systems Based on Automated Fare Collection Data: Case Study of Guangzhou, China

2019 ◽  
Vol 2673 (4) ◽  
pp. 917-929 ◽  
Author(s):  
Ning Huan ◽  
Enjian Yao ◽  
Binbin Li
Keyword(s):  
Early Warning ◽  
Traffic Control ◽  
Safety Management ◽  
Early Stage ◽  
Point Of View ◽  
Control Measures ◽  
Passenger Flow ◽  
Early Warning Mechanism ◽  
Metro Systems

Recently, surges of passengers caused by large gatherings, temporary traffic control measures, or other abnormal events have frequently occurred in metro systems. From the standpoint of the operation managers, the available information about these outside events is incomplete or delayed. Unlike regular peaks of commuting, those unforeseen surges pose great challenges to emergency organization and safety management. This study aims to assist managers in monitoring passenger flow in an intelligent manner so as to react promptly. Compared with the high cost of deploying multisensors, the widely adopted automated fare collection (AFC) system provides an economical solution for inflow monitoring from the application point of view. In this paper, a comprehensive framework for the early warning mechanism is established, including four major phases: data acquisition, preprocessing, off-line modeling, and on-line detection. For each station, passengers’ tapping-on records are gathered in real time, to be further transformed into a dynamic time series of inflow volumes. Then, a sequence decomposition model is formulated to highlight the anomaly by removing its inherent disturbances. Furthermore, a novel hybrid anomaly detection method is developed to monitor the variation of passenger flow, in which the features of inflow patterns are fully considered. The proposed method is tested by a numerical experiment, along with a real-world case study of Guangzhou metro. The results show that, for most cases, the response time for detection is within 5 min, which makes the surge phenomenon observable at an early stage and reminds managers to make interventions appropriately.

Проблема защиты высокостеллажных складов спринклерными автоматическими установками пожаротушения

2020 ◽  
Author(s):  
Sergey Kopylov ◽  
Leonid Meshman ◽  
Leonid Tanklevsky ◽  
Alexander Bondar
Keyword(s):  
Early Stage ◽  
Side Surface ◽  
Spray Angle ◽  
Stored Products ◽  
Building Structures ◽  
Fire Load ◽  
Electric Cars ◽  
Fire Extinguishing ◽  
Start Up ◽  
Irrigation Intensity

Рассмотрены вопросы обнаружения и тушения пожара при высокостеллажном складировании продукции, являющейся пожарной нагрузкой, с использованием пожарных извещателей и автоматических установок пожаротушения (АУП). Проанализированы различные схемы АУП и подачи огнетушащих веществ (ОТВ), их преимущества и недостатки. Исходя из особенностей пожара на стеллажных складах, показана необходимость скорейшего его обнаружения и подачи ОТВ. Сформулированы задачи, решение которых позволит добиться максимальной эффективности применения АУП на высокостеллажных складах.Currently, there is a tendency to equip objects (warehouses, shopping centers) with racks for storing various products. The stored products represent a significant fire load (combustible packaging, products themselves, etc.). Racks can be of a great height (more than 10 m), be located both in isolation and in groups, and even be load-bearing as a part of the power frame of the building. The technology of racks loading and unloading provides for the use of electric cars with special lifts (stacker). The result of a fire at an object with high-rack storage (HRS) is a large material damage due to the destruction of stored products and damage (collapse) of the building as well as risk to people and undesirable socio-psychological resonance. Due to rapid flame spread on a vertical in case of fire on the object with HRS, the most important condition for the effective use of automatic fire extinguishing systems is to minimize the time both of fire detection and of commencement of extinguishing agent supply by appropriate sprinklers. It can be achieved by means: a) of special heat-accumulating screens above the racks at a large distance from the top of the stored goods to the ceiling that ensure the speedy operation of heat detectors; b) of satellite detectors which provide a compulsory start-up of the sprinklers. For the purpose of selective operation each satellite fire detector is equipped with a deflector or diaphragm so that the field of view of the detector agrees with the irrigated area. To concentrate the fire extinguishing agent supply directly to the high-rise rack and to provide increased irrigation intensity at the border of the sprayed stream, the spray angle of the sprinkler is limited by the flow shaper. Most often, the sprayed water flow is supplied to the upper tier of the rack and its side surface. Thus, this article presents the features of effective fire fighting at objects with HRS of products that are a fire load at an early stage of fire ignition. Various schemes of automatic fire extinguishing systems and their start-up are analyzed. In the future, it is necessary to carry out a calculated justification of the sprinkler installation sites to ensure the fire extinguishing agent supply both to the upper part and side surface of the burning rack as well as to protect neighbour racks and building structures.

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