快速移动式路面加载车MLS测试国家标准和全球应用 Mobile Load Simulators(MLS) and Their Global Applications with Testing Standards 快速移动式路面加载车MLS测试国家标准和全球应用 Yuchen Wang South Africa-China Transport Co-operation Center(SACTCC) Wayne Zhang International Society of Mobile Load Simulator(ISMLS) 10 July 2019, CSIR ICC, Pretoria, South Africa

Location of South Africa 南非地理位置

Mobile Load Simulator移动式路面加速加载车

South Africa南非 Geographic and economic Political Technology Research at Universities Transport & Infrastructure Innovation Others

South African National Road Network

Road condition assessments for SA National Road

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MLS Specifications Pave®MLS11 Pave®MLS30/33 Pave®MLS66/69   Pave®MLS11 Pave®MLS30/33 Pave®MLS66/69 Wheel Carriages # 4 wheel bogies 6 wheel bogies Full load test section length mm 1070 3000/3300 6600/6900 Tyre footprint length 1420 4000 7600 Traffic Wheel width 80 590 Trafficking width (lateral traffic width) 80 - 230 (0 to ±75 wander) 590 - 1 600 (0 to ±500 mm wander) Lateral Traffic Load Distribution Gaussian or channelised Gaussian, step function, channelised or any user definable distribution Wheel description and configuration single dual / super single dual / super single/ aircraft Tyres Vredestein 6 ply pneumatic – 300mm diameter Goodyear 285/70 R19.5 and super single 495/45 R22.5 Goodyear 305/70 R22.5 and super single 495/45 R22.5 or H40x14 aircraft Tyre pressure kPa 560 - 800 500 - 1000 Wheel load kN 1.9 - 2.9 40 - 75 Wheel suspension and load control Constant Load - Mechanical Spring Costant load - Pneumatic Hydraulic Wheel velocity m/s 0.5 to 2.5 1.5 to 6 Nominal maximum wheel passes # / h 7200 6000 Rut depth (max) 10 40 Noise level dB - 85 at 7.2m Fabrication unit Metric system Life span of structural frame 30 Years subject to normal wear and tear. Expected fatigue of bogie frames measured in machine load cycles 100 million Mass kg 700 39,000 46,000 MLS dimensions m 2.7L x 0.7W x 1.2H 11.2L x 2.6W x 3.1H 14.8L x 2.6W x 3.1H

MLS Advantages 12 times faster: up to 22km/h + up to 6 wheel bogies Movable, Self-walking, for indoor and outdoors Wandering test LIM technology - Linear Induction Motors Low cost running and maintenance

Global MLS Users

Overview of MLS

Mechanism of Model MLS

Moving MMLS in R80 site

Rutting Testing

Inside Model MLS

Simulating Environment at Pretoria West R80

Taking the cylinders on site

Winter Testing On Sites

Winter Testing

National Standards of Model Mobile Load Simulator

International Society of MLS

MLSUG Full-scale SEU & JSTI Liaoning EMPA Changsha BASt Tongji

MLS Users Group

MLSUG 1/3 scale Out of China JSTI Tongji Guangdong Changsha

Proposed Technical Seminars 1). World Transport Convention (WTC), May 2020, Beijing, China 2). Seminar of Fast Moving Loading Big Date and Standards of MLS, July 2020, Pretoria, South Africa Others