Study On Design Of Fire Evacuation Instruction System In Industrial Plant

All the time,the fire safety of industrial plant has been paid too much attention in the society.The huge economic losses and casualties caused by the fire are shocking.After analyzing a large number of cases about fire safety in China and abroad,it was concluded that when the fire and other emergency emergencies occurred,the number of casualties was closely related to the evacuation indication system in the building.At present,the guidance path of evacuation indication system adopted in China is inflexible,the layout of industrial plant is complex and the environment is chaotic.When the fire occurs,the best escape path should also change with the spread of the fire and the change of the field environment.And the traditional evacuation indication system can not meet the need of escape personnel to quickly identify the escape path under the changing environment.Therefore,a new fire evacuation indication system was designed in this study.First,the existing virtual reality technology was studied,and its related concepts and technical characteristics were understood.The visual system and cognitive system of human were understood,including the structure of human’s eyes,the levels of visual cognitive and the process and principle of human brain in processing the information.The current national standards and reality related to emergency evacuation were understand.Second,3d Max was used to build the same factory building model as a motor packaging factory and V-ray software was used to perform photorealistic rendering.Unity was developed to achieve the same factory scene as the real world,and C#language was used to achieve the interaction between people and scenes under VR equipment.At the same time,the visual effect of fire and the auditory effect of alarm were set by adjusting the parameters of particle system in the scene.Virtual reality simulation experiments were performed in this scenario.The experiment recruited 24 participants,each of them participated in 3 groups of experiments,to explore the most appropriate colors in red,green,and blue in a state of emergency as an escape indication,the escape efficiency of the fire emergency display device brightness at 5cd/m~2,150cd/m~2 and 300cd/m~2 and the escape efficiency of the key information flashing frequencies at 1 Hz,15Hz and 30Hz in a state of fire emergency.The results showed that:green was the most color for participants to choose,and get the most approval in view of color semantics.With the brightness increased,the escape efficiency increased as well,but statistically after the post-test,there was no significant difference in escape time under high and medium brightness,so the lower energy consumption of 150cd/m~2 brightness was chose as the brightness considered in the design.In the range of human eye recognition,with the increase of flicker frequency required escape time,30 Hz flicker frequency was escape efficiency,so the design considered 30 Hz flicker frequency.Then the scheme design of fire evacuation indication system was carried out based on the experimental results.By reading the literature and related materials,the design requirements and market trends of evacuation indication system were summarized.The system consisted of three modules:central control system,cloud server and display terminal.The central controller system coordinated with other modules to identify and transmit fire conditions and escape paths to escapees.The design of the application end display equipment was carried out from the factors of function,material and technology,modeling,structure,man-machine and so on,and the physical model was made.The display equipment modeling mainly referred to the factory specific environment and fire prevention function;the interface was mainly designed referring to the experimental results,the design conformed to the human visual cognition system,achieved the effect of receiving information efficiently;the layout of the factory indication system was based on the guiding system design principle,and provided information to the escapees at the decision point.Finally,the efficiency of this design was compared with that of the original factory instruction system through virtual reality experiments.The usability of the system was evaluated by the availability questionnaire,which was approved by most participants.