The Development Of The Instrument Of Alarm For Small Scale Outside Work

Safety is the key in the railway transportation. In order to ensure the safety ofrailway, the railway's departments of serving must be often check the communicationand signal device; also the check and repair should not break off the normal busytransportation. So before work in the past, it is necessary to setup a defense districtbeforehand in order to guarantee the safety of working people, and assign two peopleto stand at the end of district to watch the train. Because the various condition of thecircumstance climate and situation, sometimes the working people can't get thealarm signal of train-approaching, it will cause the incident. So it is very necessary todesign a safe alarm of train-approaching . There are many methods to carry out the train-approaching alarm, and here wemake use of the sound alarm. Through the conduction of rail, the sound sensor cangather the signal of sound produced by the interaction of the track and wheels, andthen to process and analysis on it, so that to acquire the coming train's signal andalarm. The instrument can be placed at the working site instead of the edge ofprotection district. The key of this task is how to acquire the character of train-running signals, andthe acquiring signals mixed with a lot of noise, and it is very feeble also. A kind ofdata acquisition and processing method based on DSP system is presented, aiming atthe speed limitation of traditional data acquisition systems. To process the acquisitionsound signal from the rail-way, The system is of some advantages such as betteranti-jamming, good real-time performance, high reliability, low-power dissipationand so on . - 6 -哈尔滨理工大学工学硕士学位论文 In this paper, some methods are introduced, and according to the meansintroduced, diversified signals are primary analyzed. Except these, it designed theinstrument's hardware and software and made it.