DIN 70021 Passenger Car Tyre Noise Test
The DIN 70021 passenger car tyre noise test is a critical procedure that evaluates the acoustical performance of tyres, ensuring they meet stringent European standards for quieter and more comfortable driving experiences. This test is pivotal in automotive quality assurance and compliance with EU regulations aimed at reducing road traffic noise.
Developed by the German Institute for Standardization (Deutsches Institut für Normung or DIN), the DIN 70021 standard sets out detailed methodologies to measure tyre noise levels, focusing on the outer groove noise generated during rolling. This parameter is crucial as it directly impacts passenger comfort and contributes to a quieter driving environment.
The test involves measuring the sound pressure level (SPL) of the outer grooves while the tyre is in motion on a specially designed test rig. The apparatus used includes a rolling road, a noise measurement system compliant with ISO 9612 or IEC 60651 standards for sound level meters, and a calibrated microphone array.
Compliance with DIN 70021 is mandatory for all passenger car tyres sold in the European Economic Area (EEA). This ensures that tyre manufacturers adhere to stringent noise levels set by EU directives. The test results are reported as decibels (dB) at different rolling speeds, typically ranging from 45 km/h to 95 km/h, reflecting real-world driving conditions.
For quality managers and compliance officers, this test is essential for ensuring that products meet regulatory requirements before they reach the market. R&D engineers can utilize these results to refine tyre designs and materials for better noise control. For procurement teams, it provides a benchmark against which suppliers are evaluated.
The DIN 70021 standard also emphasizes the importance of consistent test conditions to ensure accurate comparisons between different tyre models. This includes standardized rolling speeds, tyre temperatures, and road surface characteristics to simulate real-world driving scenarios accurately.
Real-world applications highlight the significance of this test in reducing noise pollution from vehicles, contributing positively to urban environments. By adhering to DIN 70021, manufacturers can enhance brand reputation through quieter tyres, which are not only more environmentally friendly but also offer a better driving experience for consumers.
- Industry Applications: Passenger car tyre manufacturing, R&D in automotive engineering, quality assurance departments, and procurement teams.
- International Acceptance and Recognition: DIN 70021 is widely recognized across the EEA and beyond. It aligns with EU directives on reducing noise pollution from road traffic.
Scope and Methodology
The scope of DIN 70021 encompasses the measurement of the acoustical performance of tyres, particularly focusing on outer groove noise. The test is conducted on a rolling road with a predefined set of conditions to ensure consistency across different tyre models.
Methodologically, the test involves placing a calibrated microphone array around the tyre's circumference at specific intervals. As the tyre rolls, sound pressure levels are captured and analyzed using advanced signal processing techniques. This ensures accurate measurement and minimization of errors due to external factors like wind interference.
The rolling road is equipped with sensors that monitor tyre temperature and speed continuously during testing. These variables are crucial as they directly influence the noise generation characteristics of the tyres. The test is typically conducted at various speeds, reflecting different driving conditions encountered by consumers.
Acceptance criteria for DIN 70021 stipulate that the outer groove noise must not exceed specified decibel limits. Compliance with these limits ensures that the tyre meets the stringent requirements set by EU directives on reducing road traffic noise. Failure to meet these standards can result in non-compliance penalties and potential recalls.
The test results are reported as a comprehensive acoustic profile of the tyre, including sound pressure levels at different rolling speeds. This data is used by manufacturers for product improvement and marketing purposes, ensuring that consumers receive tyres that not only comply with regulations but also offer superior driving experiences.
Industry Applications
- Passenger car tyre manufacturing: Ensuring compliance with international standards.
- R&D in automotive engineering: Innovating quieter, more efficient tyres.
- Quality assurance departments: Verifying product performance against regulatory requirements.
- Procurement teams: Evaluating suppliers based on test results and compliance.
The DIN 70021 tyre noise test plays a crucial role in the automotive industry by providing data that is essential for several key applications. Manufacturers use this information to develop quieter tyres, which are not only environmentally friendly but also enhance driving comfort. Quality assurance teams rely on these results to ensure product reliability and compliance with regulatory standards.
For procurement departments, test results from DIN 70021 are critical in selecting suppliers who meet stringent noise performance criteria. This ensures that the tyres used in vehicles conform to international standards, thereby contributing to a quieter driving experience for consumers. Additionally, R&D teams leverage this data to innovate and refine tyre designs, focusing on reducing noise generation while maintaining or improving other key performance indicators.
International Acceptance and Recognition
- DIN 70021 is widely recognized across the European Economic Area (EEA).
- The standard aligns with EU directives on reducing road traffic noise.
- It is accepted by tyre manufacturers globally for compliance purposes.
- International acceptance extends to quality assurance and R&D teams worldwide.
DIN 70021 enjoys a high degree of international recognition, particularly within the European Economic Area (EEA). Its alignment with EU directives on reducing road traffic noise makes it an essential standard for tyre manufacturers operating in EEA countries. This standard is not only widely accepted but also recognized by quality assurance and R&D teams globally.
The acceptance of DIN 70021 extends beyond the EEA, with many international tyre manufacturers adopting this test as a benchmark for compliance. By adhering to this standard, manufacturers can ensure that their products meet stringent noise performance criteria, thereby enhancing consumer satisfaction and contributing positively to urban environments.
International recognition of DIN 70021 is further underscored by its alignment with global trends towards more sustainable and quieter vehicles. This standard provides a framework for tyre manufacturers to innovate and refine their products, focusing on reducing noise generation while maintaining or improving other key performance indicators.
