钢厂噪声特性分析

为了研究钢厂噪声污染情况,采用噪声测试系统对钢厂内各个主控室和质量检测车间、炼钢车间、轧钢车间各个设备的噪声进行了信号数据采集,采样频率为44,100 Hz,通过FORTRAN编程计算处理最终得出噪声信号的倍频程图和总声压级,分析确定出各个设备噪声的频率分布规律。实验结果表明,质量检测车间的砂轮切割床、炼钢车间的RH炉和轧钢车间的矫直工艺流程噪声最大,噪声强度分别达到了98.46 dB(A)、101.04 dB(A)和100.44 dB(A),噪声主要频率范围分别为250~8000 Hz、1000~16,000 Hz、250~8000 Hz,占总声能的比例分别为76.56%、64.68%、76.67%。钢厂各个休息室中连铸主控室的噪声最大,总声级达到了87.54 dB(A),主要噪声频段为63~2000 Hz,占总声能的73.09%。因此,应对三个车间和主控室设计降噪方案,在车间内保证工人作业时佩戴隔音耳塞,在主控室内安装隔声墙,隔声窗等。

Design of Intelligent Fire Alarm System for Large Storage Places Based on AVRmega128 Single Chip Microcomputer

With principles of reliability, independence, practicality and economical effi- ciency, a set of intelligent fire alarm system based on AVRmega128 single chip microcomputer was designed to solve problems of fire alarm system in many large- scale warehouses. Using advanced flame sensor, 485 bus communication, computer interactive software and related peripheral devices, this intelligent fire alarm system has functions of sound-light alarm and intelligent fire extinguishing. The human-com- puter interactive software was adopted for the remote control of the alarm main control panel through the 485 bus communication. This design of intelligent fire alarm system shows high reference and practical value to the development of intel- ligent alarm products with high integration and high reliability.