ISO/TS 13471-1:2017 音響—タイヤ/ロードノイズ測定に対する温度の影響—パート1：CPX法でテストする際の温度の補正 | ページ 6

3.1.1

タイヤ/ロードノイズ

タイヤと路面の相互作用によって発生する騒音

3.1.2

CPX法

近接法

タイヤ/ロードノイズ (3.1.1) が 支配的でパワーユニットのノイズがあまり重要ではない条件下で、道路舗装の特性が車両および交通騒音に及ぼす影響を評価するために設計された測定手順

注記 1:この方法は ISO 11819-2 で規定されています。

注記 2: 測定は、特別な試験車両に搭載された 1 つ以上の試験タイヤの近くに配置されたマイクを使用して行われます。

3.1.3

CPXレベル

近接レベル

L _{_}

CPX 法 (3.1.2 ) によって決定されるタイヤ/ロードノイズの時間平均 A 特性音圧レベル (SPL) (3.1.1 )、必要に応じて広帯域またはスペクトル帯域のいずれか

注記 1: CPX レベルはデシベルで表されます。より多くの情報を提供するために、追加の接尾辞が使用されます。 CPX メソッドが説明されている ISO 11819-2 where 参照してください。

3.2.1

reference tyre

test tyre specified for the purpose of representing certain features in tyre/road sound emission, designed and constructed for use in the CPX method (3.1.2) with specified and reproducible standard properties

Note 1 to entry: The reference tyres are specified in ISO/TS 11819-3.

3.2.2

road surface

surface course

upper course of the pavement, which is in contact with the tyres

Note 1 to entry: Various main types of road surfaces are described in Annex B.

3.3.1

air temperature

ambient air temperature

temperature of the air surrounding the tyres under test, but measured in such a way that the sensor is exposed to the airflow and protected from direct solar radiation

Note 1 to entry: The air temperature is expressed in degree Celsius.

3.3.2

road temperature

road surface temperature

static temperature of the part of the road that is in contact with the tyre(s) rolling on the road ここで, static means that it is the temperature that changes only with pavement convection, sun radiation and meteorological conditions

Note 1 to entry: The road temperature is expressed in degree Celsius.

3.3.3

tyre temperature

general term for the temperature of the reference tyre (3.2.1) , which influences noise emission

Note 1 to entry: The tyre temperature is expressed in degree Celsius.

Note 2 to entry: Tyre temperature varies substantially between different parts of the tyre, as well as with the tyre operating conditions. In this document, distinction is not made between these different parts, but the tyre is seen as a unit with a temperature that influences noise emission in a particular way.

3.3.4

tyre tread temperature

temperature of the surface of the tread of the reference tyre (3.2.1)

Note 1 to entry: The tyre tread temperature is expressed in degree Celsius.

Note 2 to entry: In this document, this is considered the temperature of the centre one-third of the tread width.

3.3.5

reference temperature

T_ref

air temperature (3.3.1) of 20,0 °C representing a hypothetical, ideal measurement case, to which actual measurements are normalized

Note 1 to entry: The reference temperature is expressed in degree Celsius.

3.3.6

temperature correction term

C_T,t

term used for correcting the CPX level (3.1.3) for temperature T for tyre t

Note 1 to entry: The temperature correction term is expressed in decibels.

3.3.7

temperature coefficient

coefficient used for correcting the CPX level (3.1.3) for the effect of temperature for tyre t

Note 1 to entry: The temperature coefficient is expressed in decibels per degree Celsius.