Automatic monitoring of noise in functional areas

Automatic monitoring of noise in functional areas refers to the technology of continuous and real-time monitoring of noise levels in specific functional areas such as cities, industrial zones, and transportation arteries through intelligent devices. Its core objective is to assess the status of noise pollution, ensure compliance with national or local acoustic environmental quality standards, and provide data support for noise control.

Automatic noise monitoring in functional areas is a technology that uses noise monitoring equipment installed in specific functional areas to detect the noise level in real-time and automatically upload data, so that relevant departments can take timely measures to reduce noise pollution. It adopts technical means such as acoustic sensors, data acquisition systems, and computer processing systems to achieve real-time monitoring, data analysis, and reporting of environmental noise.

1、 Technical principles

1. Acoustic sensor: capable of real-time collection and recording of sound signals in the environment.

2. Data acquisition system: Collect sound signals collected by acoustic sensors and convert them into digital signals for further processing.

3. Computer processing system: receives and processes digital signals, analyzes and processes data through computer software, obtains results, and performs subsequent processing effects such as display or alarm.

2、 System composition

1. Noise sensor: a high-precision microphone used to collect raw noise signals.

2. Data collector: Convert sound signals into digital signals, record parameters such as equivalent sound level (Leq), maximum sound level (Lmax), and spectral analysis.

3. Transmission module: Real time data is wirelessly transmitted to the cloud or local servers via 4G/5G, fiber optic, or LoRa.

4. Data processing platform: for data cleaning, storage, analysis, generating statistical reports and over limit alarms.

5. Auxiliary equipment: meteorological sensors (temperature and humidity, wind speed), lightning protection devices, solar power supply systems, etc.

3、 Application scenarios

（1） Environmental Protection Department

Detecting noise in the surrounding environment, monitoring and analyzing noise sources and distribution, noise levels and frequency distribution, etc. By utilizing monitoring data, environmental protection departments can take reasonable control measures based on specific situations, control noise pollution, and reduce its impact on surrounding residents.

（2） Urban planning

Assess the impact of noise and consider it in urban planning to fundamentally avoid the generation of noise pollution. For example, industrial and commercial areas with high noise requirements can be separated from residential areas during planning to prevent noise from spreading to residential areas. Monitoring data can be used to conduct regular inspections and adjustments based on actual conditions.

（3） Traffic management

Monitor the status of urban traffic noise and provide support for urban traffic management. For example, monitoring the level and temporal distribution of traffic noise can adjust traffic operation strategies appropriately, reduce traffic noise pollution, and improve urban environmental quality.

4、 System advantages

1. Efficiency: It can automatically collect, record, analyze, and alert, improving efficiency and greatly reducing workload.

2. Accuracy: Measurement data has a high degree of accuracy and stability. The accuracy of its monitoring results is also guaranteed during long-term continuous monitoring.

3. Visualization: The system has intuitive data visualization and alarm functions, which can update the changes in noise in real time, making it convenient for monitoring personnel to control and manage.

4. Portability: It has the characteristics of portability and easy installation, suitable for application and movement in different environments, and can provide effective solutions for different monitoring scenarios.

The system mainly consists of a noise monitoring substation (all-weather outdoor microphone, noise collection and analysis unit, communication unit, power supply system, meteorological monitoring module, etc.), a central server sound environment automatic monitoring data statistical analysis platform, etc. It can monitor and analyze the characteristics of environmental noise, determine the source of noise, and achieve remote data telemetry, noise event monitoring, system automatic calibration through wireless or wired network transmission, ultimately forming multiple reports.

The system complies with the requirements of GB/T3785.1 for Level 1 sound level meters, and the equipment has functions including automatic calibration, recording, and 1/1 octave and 1/3 octave frequency spectrum analysis of the microphone. It meets the requirements of GB3096-2008 "Sound Environment Quality", HJ906-2017 "Technical Specification for Automatic Monitoring of Sound Environment Quality in Functional Areas", and HJ907-2017 "Technical Requirements for Automatic Monitoring System of Environmental Noise"Automatic monitoring of noise in functional areasThe requirements.