Study Of The Volume Control Of Car Horn Based On Safe Spacing

With the increase in vehicles ownership in recent years,traffic congestion often occurs in the large and medium cities.Due to the driver's driving level,quality and road driving conditions are limited,the city's traffic whistle frequent and the volume of the horns are too high.The pedestrians is often disturbed by the whistle.There are reports of traffic accidents caused by car whistle.The whistle exacerbates the noise level of the road traffic.Therefore,the society and people have been paid much attention to the noise of car horn.In order to make the car horn remind pedestrians,cause other vehicles attention and bring litter noise pollution to the city environment.The article analyzes the types of automobile horns,the characteristics of horn noise.The investigation and analysis of the whistle spacing,vehicle whistle and roadside whistle noise of the vehicle in the city.Found that the city's vehicle whistle spacing is relatively short,most of the 4~12m range.77.42% of the people in the city are too harsh and panic for the high volume of the car horn.The volume of the horns measured are too high during the day and night.In order to get the appropriate horn volume control model.The article investigates the subjective troubles of the horn,and uses the fuzzy mathematics method to calculate the threshold of annoyance for the day and night.And Ridit is used to test,verify the rationality of the horn trouble threshold.The calculation formula of horn sound attenuation is analyzed.The safe spacing model under the condition of emergency braking is studied,and the safe spacing model between the vehicle and the vehicle is analyzed,and the safe spacing model used in this paper is finally determined.The article combines the human ear for the horn sound annoyance threshold,sound attenuation model and safe spacing model established the whistle horn volume model.In order to further verify the rationality of the volume model of the whistle horn,LMS Virtual.Lab Acoustics is used to analyze the ground,unilateral buildings and both sides of the building.The horn volume model is corrected according to the simulation results.The volume control device is designed according to the speaker volume model.As the volume control model is designed for the pedestrian annoyance threshold on the road,At the end of the paper,the influence of the engine,the window sound and the use time of the vehicle on the noise value of the driver's ear is measured by the experiment.It is verified that the horn volume model can remind the driver of the front vehicle.