GB11871-2009

Limits of airborne noise emitted by marine diesel engines

船用柴油机辐射的空气噪声限值

GB 11871-2009 est une norme nationale chinoise obligatoire en vigueur : Limits of airborne noise emitted by marine diesel engines. Secteur : Automobile. Thème principal : Méthodes d’essai. Entrée en vigueur : 1 août 2009.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

This standard applies specifically to marine diesel engines during bench testing (testbed conditions). It defines the A-weighted sound power level limits for airborne noise radiated by these engines. It is important to note that this standard is strictly applicable to bench test scenarios and does not cover in-situ vessel operations.

Exigences techniques

Chapter 3 of this standard is mandatory and establishes the upper limit values for airborne noise radiation. Instead of a traditional tabular format, the standard utilizes a formula method to calculate the maximum allowable A-weighted sound power level ($L_{w}$) based on the engine's rated power and rated speed. The calculation incorporates a specific constant, C, which varies depending on whether the engine's rated power is below or above 736 kW, and further adjusts based on whether the rated speed is under or over 300 r/min. Manufacturers must ensure their engine's calculated noise limit is precise to one decimal place to meet compliance.

Méthodes d’essai

The standard mandates that noise measurement procedures follow the engineering method outlined in the referenced standard GB/T 9911. If the acoustic test environment cannot satisfy the strict requirements of the engineering method, the quasi-engineering method may be utilized as an alternative, provided there is mutual agreement between the buyer and supplier, and it is explicitly documented in the final test report.

Questions fréquentes

What products and testing phases are regulated under GB 11871-2009?

It applies to marine diesel engines during bench testing (testbed conditions), specifically evaluating the A-weighted sound power level of airborne noise radiated during rated power and rated speed operations.

Are there any significant updates from the previous GB 11871-1989 version?

The updated version transitions from a tabular method to a formula method for calculating noise limits. Additionally, the precision of the limit values has been improved to one decimal place, and the overall noise limits for marine diesel engines have been revised.

How is the airborne noise measured according to this standard?

The standard mandates that measurements be conducted using the engineering method specified in GB/T 9911. If the acoustic test environment does not meet engineering method requirements, a quasi-engineering method may be used upon mutual agreement between the supplier and buyer, provided it is clearly stated in the test report.

The summary above provides a high-level overview of GB 11871-2009. To ensure complete compliance for your marine engines entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 11871-2009 today to access all detailed calculation parameters, constant values, and testing procedures.

Indications d’applicabilité

Type: Protection de l’environnement
CCS: U44
ICS: 47.020.20
Autorité compétente: Ministry of Ecology and Environment
Comité technique: Ministry of Ecology and Environment

Relations

Remplace:GB 11871-1989