What causes the sound of a train whistle blowing?

Introduction

The sound of a train whistle is a distinctive and recognizable noise that serves both functional and safety purposes. Understanding the causes behind this sound involves examining the mechanisms of sound production and the factors influencing the characteristics of the whistle.

Key Insights

Point Source of Sound: Train whistles are considered point sources of sound, meaning the sound radiates outward from a single point. This is in contrast to engine and track noise, which are considered line sources due to their extended nature along the length of the train.
Frequency and Pressure Relationship: The frequency of the sound produced by a whistle is almost linearly dependent on the rate of fluid flow (air or water) through the whistle. This means that as the pressure of the air applied to the whistle increases, the frequency of the sound also increases.

Conclusion

The sound of a train whistle is primarily caused by the escape of air through the whistle, which acts as a point source of sound. The frequency of the whistle's sound is closely related to the rate of air flow and the pressure applied. This understanding helps in comprehending the distinct and variable nature of train whistle sounds.

What causes the sound of a train whistle blowing?

Summary

Introduction

Key Insights

Conclusion

Sources and full results

Noise Levels due to Trains

Whistles are point sources, engines and track noise are line sources, and passenger engines show marked changes in noise level due to exaggerated power changes.

A Vortex Whistle

The vortex whistle produces sound by the escape of a vortex from an open end of a tube, operating equally well on air or water, with frequency nearly linearly dependent on flow rate and pressure applied to the whistle.

Experiments Concerning the Vortex Whistle

The vortex whistle in air and water is caused by a circular distribution of dipoles, with its frequency being related to the angular velocity of steady fluid motion, and acoustic feedback from surfaces remote from the flow does not influence it.

Intelligent Whistling System of Rail Train Based on YOLOv4 and U-Net

The intelligent whistle system for railway trains based on deep learning accurately adjusts the whistle volume based on road conditions, reducing traffic accidents and noise pollution.

Community noise model for train warning horn

Train warning horns at grade crossings cause significant noise in communities, and reducing their use may help reduce noise levels.

INDIVIDUAL AND SITUATIONAL CORRELATES OF WHISTLE‐BLOWING

Whistle-blowing is more likely among employees who hold professional positions, have positive work experiences, longer service, recent recognition for good performance, are male, part of larger work groups, and work for organizations perceived as responsive to complaints.

Potential Predictors of Whistle-Blowing: A Prosocial Behavior Perspective

Whistle-blowing is a form of prosocial behavior, with personality and situational variables being predictive factors in individuals who choose to report organizational wrongdoing.

Organizational dissidence: The case of whistle-blowing

Organizational whistle-blowing is influenced by members' motivations, power relationships, and the reactions of authorities, with variables affecting both decisions and responses.

Whistle blowing

Medical students are subliminally taught not to blow the whistle, potentially affecting their decision-making and physical and emotional health.

Whistle blowing

Medical students are subliminally taught not to blow the whistle, potentially affecting their decision-making and emotional well-being.

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