7. General
7.1 Test Preparation—-Condition new tires by running them at or near their rated load and inflation pressure on the test vehicle (or on another suitable vehicle) at normal traffic speeds for at least 200 miles (300 km) or equivalent before they are used for test purposes. Prior to each series of tests, warm up the tire by traveling for at least 5 miles (10 km) at normal traffic speeds. Inspect the tire for flat spots, damage, or other irregularities that may affect test results, and replace if it has been damaged or is worn beyond the wear line. Check the test-wheel load (if adjustable) and adjust, if necessary, prior to each test series to within the value specified in 4.3. Set the test tire inflation pressure at 24 6 0.5 psi (165 6 3 kPa) at ambient temperature just before the 5-mile (10-km) warmup.
7.2 Test Sections—-Test sections shall be defined as sections of pavement of uniform age and uniform composition that have been subjected to essentially uniform wear. For instance, sharp curves and steep grades shall not be included in the same test section with level tangent sections, nor shall passing lanes be included with traffic lanes. Take skid-resistance measurements only on pavements that are free of obvious contamination.
7.3 Skid Resistance of a Test Section—-Make at least five determinations of the skid resistance, at intervals not greater than 0.5 mile (1 km), in each test section with the test vehicle at the same lateral position in any one lane and at each specified test speed. Consider the arithmetic average of all determinations to be the skid resistance of the test section. If statistical or other criteria applied to the skid number for a long test section indicate that it cannot be considered to be uniform, treat the section as two or more sections. For treatment of the results of faulty tests, see Section 10.
7.4 Lateral Positioning of Test Vehicle on Highway—-Normally, testing shall be done in the center of the left wheel track of a traffic lane of a highway. A skid number for a highway surface may be quoted without qualification, only if the test vehicle was so positioned during the test.
7.5 Test Speeds—-The standard test speed shall be 40 mph (65 km/h), and tests shall normally be conducted at that speed. Where the legal maximum speed is less than 40 mph, the tests may have to be conducted at a lower speed. Where the legal speed is considerably in excess of 40 mph, tests may be made at the prevailing traffic speed, but it is recommended that at the same locations, additional tests be made at 40 mph. Maintain test speeds within 61 mph (1.5 km/h).
7.5.1 The test speed and the type tire are to be cited when quoting the obtained skid number. This is to be done by adding the test speed in miles per hour and the letter R for rib tire or S for smooth tire after SN. For example, SN40R indicates that the test was run at a test speed of 40 mph with a Specification E 501 Standard Rib Tire for Pavement Skid Resistance Test, and SN50S indicates that the test was run at a test speed of 50 mph with a Specification E 524 Standard Smooth Tire for Pavement Skid Resistance Test. When the SI system is used, the test speed shall be in parentheses. For example, SN(65)R indicates that the test was run at a test speed of 65 km/h with an E501 Standard Rib for Pavement Skid Resistance Test.
7.6 Skid-Resistance Speed Gradient Determination—- Report the change of the skid number with speed as the slope of the SN versus speed curve which is plotted from at least three speeds in increments of approximately 10 mph (15 km/h). The standard speed gradient shall be defined as the slope of the SN-speed curve at 40 mph (65 km/h) and shall be so indicated.
7. 일반 7.1 테스트 준비--실행 하 여 그들에 또는 근처에 그들의 정격된 부하 및 인플레이션 압력 테스트 차량 (또는 다른 적당 한 차량)에 적어도 200 마일 (300 킬로미터) 또는 상응 하는 정상적인 소통량 속도에서 테스트 목적으로 사용 하기 전에 새 타이어를 조건. 테스트의 각 시리즈, 이전 정상 트래픽 속도에서 5 마일 (10 킬로미터) 이상 여행 하 여 타이어 따뜻한. 평면, 손상, 또는 교체 손상 되었습니다 또는 착용 선 넘어 착용 하는 경우 테스트 결과 영향을 미칠 수 있는 다른 비리에 대 한 타이어를 검사 합니다. (조정 가능한) 경우 테스트-휠 부하를 확인 하 고 조정, 필요 하다 면, 각 테스트 시리즈 4.3에 지정 된 값에서 이전. 24 6에서 테스트 타이어 인플레이션 압력을 설정 0.5 psi (165 6 3 kPa) 5 마일 (10 킬로미터) 평가 전 직전 주위 온도에. 7.2 테스트 섹션--테스트 섹션 본질적으로 균일 한 마모를 받게 되었습니다 일정 한 나이 및 균일 한 조성의 포장의 부분으로 정의 한다. 예를 들어, 날카로운 곡선 및 가파른 급료 수준 탄젠트 섹션, 동일한 테스트 섹션에 포함 되지 한다도 교통 차선 포함 되어야 차선을 전달 한다. 분명 오염 무료 포장에만 미끄럼 저항 측정을 수행. 7.3 스키 드 저항 테스트 섹션의--스키 드 저항 하지 어떤 한 차선에서 같은 가로 위치에서 테스트 차량으로 각 테스트 섹션에서 0.5 마일 (1 킬로미터), 보다 큰 간격의 적어도 5 개의 결정을 확인 하 고 각 테스트 속도 지정. 테스트 섹션의 스키 드 저항 될 모든 결정의 산술 평균을 고려 하십시오. 긴 테스트 섹션의 스키 드 번호에 적용 된 통계 또는 다른 조건을 경우 균일 한 것으로 간주 될 수 없습니다, 두 개 이상의 섹션으로 섹션을 처리 합니다. 잘못 된 테스트 결과의 처리, 섹션 10 참조. 7.4 옆 고속도로에 테스트 차량의 위치--일반적으로, 테스트 한다 할 고속도로의 교통 차선의 왼쪽된 바퀴 궤도의 센터에서. 도 표면에 대 한 미끄럼 번호 테스트 차량 테스트 하는 동안 그래서 위치한 경우에 자격 없이 인용 될 수 있습니다. 7.5 속도 테스트--표준 테스트 속도 40 mph (65 km/h), 여야 하 고 그 속도에서 정상적으로 테스트를 실시 한다. 법적 최대 속도 미만 40 mph, 테스트는 낮은 속도에서 실시 할 수 있습니다. 법적 속도 상당히 40 mph를 초과 하는, 일반적인 트래픽 속도에서 테스트를 만들 수 있습니다 하지만 동일한 위치에 추가 검사가 속도로 40 mph. 유지 테스트 61 mph (1.5 k m/h) 내에서 만들 수 것이 좋습니다. 7.5.1 테스트 속도 및 유형 타이어 획득된 스키 드 번호를 인용 하는 때 인용 될 것 이다. 이것은 SN 후 시간과 매끄러운 타이어에 대 한 갈비뼈 타이어 또는 S R 편지 당 마일에서 테스트 속도 추가 하 여 할 것. 예를 들어 SN40R 나타냅니다 포장 미끄럼 저항 테스트에 대 한 규격 E 501 표준 리브 타이어와 40 mph의 테스트 속도에서 테스트가 실행 했다 SN50S 포장 미끄럼 저항 테스트를 위한 테스트 사양 E 524 표준 부드러운 타이어와 50 mph의 테스트 속도에서 실행 했다 나타냅니다. SI 시스템을 사용 하는 경우 테스트 속도 괄호로 여야 한다입니다. 예를 들어 SN (65) R 포장 미끄럼 저항 테스트를 위한 테스트 E501 표준 갈비뼈와 65km/h의 테스트 속도에서 실행 했다 나타냅니다. 7.6 스키 드 저항 속도 그라데이션 결정--대략 10 mph (15 km/h)의 단위로 3 개 이상 속도에서 플롯 속도 곡선 대 SN의 경사로 속도와 스키 드 수의 변화를 보고. 표준 속도 그라데이션 40 mph (65 km/h)에서 SN-속도 곡선의 기울기로 정의 한다 그리고 이렇게 표시 한다.
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7. 일반
7.1 시험 준비 - 최소 200 마일 (300km) 또는 이전에 상응하는 정상 트래픽 속도 또는 테스트 차량에 정격 하중과 인플레이션 압력 근처 (또는 다른 적절한 차량)를 실행하여 신품 타이어 그들은 테스트를 위해 사용된다. 시험의 각 시리즈에 앞서, 정상 트래픽의 속도로 최소 5 마일 (10km)에 대한 여행으로 타이어를 따뜻하게. 시험 결과에 영향을 미칠 수있는 평평한 장소, 손상 또는 기타 부정의 타이어를 점검하고, 손상되었거나 마모 라인을 넘어 마모 된 경우 교체합니다. 필요한 경우, 4.3에 규정 값 내에 각 테스트 시리즈에 앞서, 테스트 륜 하중을 점검 (조정되는 경우) 및 조정. 단지 5 마일 (10 킬로미터) 워밍업 전에 상온에서 24 ± 0.5 PSI (165 6 3 kPa의)에서 테스트 타이어 공기압을 설정합니다.
7.2 테스트 섹션 - 테스트 섹션은 균일 한 시대의 포장 도로의 부분으로 정의되어야한다 본질적으로 균일 한 마모를 거친 균일 한 조성물. 예를 들어, 날카로운 곡선 가파른 성적 레벨 접선 부와 동일한 시험 부에 포함되지 않는다 않으며 통과 차선 차선에 포함되어야한다. . 단지 명백한 오염의 무료 포장 도로에 미끄럼 저항 측정을
테스트 섹션의 7.3 미끄럼 저항 - 각 테스트 섹션에서 0.5 마일 (1km)보다 크지 간격으로 미끄럼 저항의 적어도 다섯 결정을, 확인 어느 하나의 차선에 각각 규정 된 시험 속도에서 동일한 횡 방향 위치에서의 시험 차량. 시험 부분의 미끄럼 저항으로 모든 결정의 산술 평균을 고려하십시오. 긴 테스트 섹션 스키드 번호인가 통계적 또는 다른 기준이 균일 한 것으로 간주 될 수 없다는 것을 표시하는 경우, 둘 이상의 섹션으로 섹션을 치료. 결함 검사 결과의 처리 용, 10. 볼
고속도로 시험 차량의 횡 방향 위치를 7.4 - 일반적으로, 테스트 도로의 차선의 좌측 차륜 용 트랙의 중심에서 수행되어야한다. . 고속도로 표면 미끄럼 번호는 시험 차량이 때문에 시험 중에 배치 된 경우에만, 자격없이 인용 할 수있다
7.5 시험 속도를 - 표준 시험 속도는 40mph (65kmh)하여야하며, 시험은 일반적으로한다 그 속도로 실시했다. 법정 최고 속도가 40mph 이하 인 경우에, 시험은 낮은 속도에서 수행 될 필요가있다. 법정 속도가 40mph을 초과하여 현저하게되는 경우, 테스트는 일반적인 교통 속도로 제조 될 수 있지만 동일한 위치에서, 추가적인 테스트가 40mph로 할 것을 권장한다. 61mph (/ H 1.5 킬로미터) 내에서 테스트 속도를 유지한다.
7.5.1 시험 속도와 유형 타이어가 인용되어야한다 얻어진 스키드 번호를 인용 할 때. 이는 시간당 마일의 테스트 속도와 SN 후 부드러운 타이어 리브 타이어 또는 S의 편지 R를 추가하여 수행 할 것입니다. 예를 들어, SN40R는 시험 포장 미끄럼 저항 시험을위한 사양 E 501 표준 리브 타이어 40 mph의 시험 속도로 실행되었음을 나타냅니다, 그리고 SN50S 테스트가 사양 E 50 mph의 시험 속도로 실행되었음을 나타냅니다 포장 미끄럼 저항 시험을위한 524 표준 부드러운 타이어. SI 시스템이 사용되는 경우, 시험 속도는 괄호 안에 있어야한다. 예를 들어, SN은 (65) R은 시험 포장 미끄럼 저항 시험에 대한 E501 표준 리브와 65kmh의 시험 속도로 실행되었음을 나타냅니다.
7.6 미끄럼 저항 속도 그라데이션 Determination-- 보고서 스키드 번호의 변경 약 10mph (15kmh) 단위로 적어도 3 배 속도에서 플롯 속도 곡선 대 (SN)의 기울기와 같은 속도로. 표준 속도 구배가 40mph (65km/h)에서 SN 속도 곡선의 기울기로서 정의되어야하며 그래서 기재한다.
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7 ทั่วไป. . . . . . . 7.1 Preparation เบลล่าโดยทดสอบเงื่อนไขใหม่ของพวกเขาที่พวกเขาวิ่ง rated หรือใกล้ๆ . . . . . . . โหลดและทดสอบความดันบนยานพาหนะ ( รถหรือบนอีก speeds at suitable ) การจราจรปกติสำหรับอย่างน้อย 200 ไมล์ ( 300 km ) หรือเทียบเท่าก่อนที่พวกเขาใช้สำหรับวัตถุประสงค์ของการทดสอบ ที่เพียงพอให้เราแต่ละคนหนึ่งของการทดสอบ , การอุ่นขึ้นของยางโดย traveling สำหรับอย่างน้อย 5 ( 10 กิโลเมตร ) ไมล์ที่การจราจรปกติ speeds ตรวจสอบสำหรับ Foursquare : ยางแบน , หรืออื่นๆที่อาจจะ irregularities test results ) และถ้ามัน damaged replace เอกฉันท์ . . . . . . . . . worn เมื่อสายเกิน . ตรวจสอบทดสอบ - 2 ล้อที่โหลด ( ถ้า adjust adjustable ) และถ้าจำเป็นให้เราแต่ละคน . . . . . . ชุดทดสอบเฉพาะใน 4.3 ค่าภายใน . ชุดทดสอบยางที่ความดันที่ 24 60.5 psi . . . . . . . ( 16563 kPa ) ที่อุณหภูมิก่อนใส่ลวดลายที่ไมล์ ( 5 - 10 - warmup km )Sections 7.2 ทดสอบ -- ทดสอบจะกำหนดเป็นส่วนของถนนจะเป็นส่วนของสิ่งที่เป็นและจะเป็น composition ที่ฉันได้ . . . subjected เมื่อเลี้ยงลูกด้วยนมประเภท สำหรับอินสแตนซ์และทำ curves steep grades จะไม่ได้ถูกรวมอยู่ในระดับเดียวกันกับส่วน tangent test ) ส่วนผมจะรวมอยู่ lanes lanes ผ่านรถติด . . . . . . . - พบกับ measurements เพียงใช้ skid บน pavements ที่ชัดเจนของ contamination ฟรี .7.3 ลื่นโอเว่นเครื่องทดสอบส่วนของ A . . . ทำให้อย่างน้อยห้าของ determinations มากขึ้นกว่าที่ไม่ได้พบกับ skid , intervals 0.5 ไมล์ ( 1 กิโลเมตร ) และทดสอบกับรถที่ทดสอบในแต่ละส่วนที่ตำแหน่งใดๆเป็นหนึ่งในวิธี lateral เลนและทดสอบความเร็วที่แต่ละ . พิจารณาค่าเฉลี่ยของทั้งหมด determinations ที่จะทดสอบในส่วนของ skid พบกับ . . ใน statistical เกณฑ์ของคุณหรืออื่นๆที่ skid number สำหรับทดสอบส่วนที่เราสามารถจะถือว่ามันไม่สามารถที่จะรักษาส่วนที่ 2 จะเป็นส่วนหรือมากกว่า , สำหรับการรักษาของผลการทดสอบผิดพลาดในส่วนของ 10 เห็น7.4 ตำแหน่งด้านข้างของยานพาหนะบนทางหลวงและการทดสอบจะทำ . . . . . . . Normally ที่ศูนย์ของล้อติดตามของ left a a highway การจราจรของถนน A skid number สำหรับ highway พื้นผิวอาจจะ quoted เท่านั้นถ้าไม่มี qualification , ทดสอบรถจึง positioned test ก่อน . .. . . . . . . . . 7.5 Speeds standard test ทดสอบความเร็วจะ 40 ไมล์ต่อชั่วโมง ( 65 km / h ) และจะ conducted ในการทดสอบนี้ที่ . ดู . . . . . . . . . . maximum ที่ความเร็วไม่เกิน 40 ไมล์ต่อชั่วโมง , การทดสอบความเร็วที่อาจจะต้องอยู่ภายใต้ conducted . อยู่ไหน . . . . . . . ดูในส่วนความเร็วของ considerably 40 ไมล์ต่อชั่วโมงอาจจะทำการทดสอบที่ความเร็ว prevailing รถติด . . . . . . . . แต่มัน recommended อยู่เหมือนกัน locations , การทดสอบเพิ่มเติมจะทำที่ 40 ไมล์ต่อชั่วโมง Maintain test speeds ภายใน 61 ไมล์ต่อชั่วโมง ( 1.5 กิโลเมตร / ชั่วโมง )7.5.1 ' ทดสอบความเร็วและประเภทยางที่คุณสามารถที่จะ cited เมื่อ obtained quoting skid number . . . . . . . . . . . . นี้จะเพิ่มความเร็วในการทดสอบที่ทำโดยไมล์ต่อชั่วโมงและตัวอักษร R หรือ S สำหรับเรียบสำหรับ rib ยางยางหลัง SN เงินตัวเลือกและ SN40R indicates test คือที่ที่ A ที่ใช้ทดสอบความเร็วของ 40 ไมล์ต่อชั่วโมงกับสเปคมาตรฐาน E , A 501 ซี่โครงสำหรับ Pavement ลื่น SN50S indicates โอเว่นเครื่องทดสอบและทดสอบที่ใช้ทดสอบคือที่ 1 50 ไมล์ต่อชั่วโมงความเร็วของมือ 524 สเปคมาตรฐาน E , Pavement โอเว่นเครื่องทดสอบสำหรับเรียบลื่น . . . . . . . . . . . . เมื่อใช้ระบบ SI จะทดสอบความเร็วใน parentheses เงินตัวเลือกและ SN ( 65 ) R indicates test คือที่ที่ A ที่ใช้ทดสอบความเร็วของ . . . . . . . 65 km / h ) E501 ซี่โครงสำหรับ Pavement ลื่นโอเว่นเครื่องทดสอบมาตรฐาน7.6 ลื่น - ลาด - รายงานกำหนดความเร็วของโอเว่นเครื่องเปลี่ยนความเร็วของ . . . . . . . . . slope skid number ) ของความเร็ว . . . . . . . plotted SN ซึ่งอาจจะสร้างจากอย่างน้อยสาม speeds ในรอคอยของ approximately 10 ไมล์ต่อชั่วโมง ( 15 km / h ) ' ' gradient จะกำหนดเป็นมาตรฐานความเร็วที่ความเร็วของ SN - slope 3 ที่ 40 ไมล์ต่อชั่วโมง ( 65 km / h ) และจะ indicated .
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