Performance Evaluation of a Heavy Duty Chisel Plow at Various Tillage Depth and Forward Speeds

In this paper, the basic composition and performance evaluation of the recycled asphalt pavement (RAP) materials were firstly analyzed, and two methods were proposed to evaluate strength characteristics of RAP materials, including a triaxial method for the residual strength and the mortar cementing method for the strength of RAP lump. Then, the cold recycling technology was applied on RAP materials with emulsified asphalt by using vibratory compaction and heavy-duty compaction methods (Proctor compaction method), and the results showed that the maximum dry density obtained by heavy-duty compaction was closer to the actual situation. Finally, the effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated. It was found that when the emulsified asphalt was mixed uniformly, whether or not to add the wetting water have almost no effect on the strength of the molded specimens. When the matrix asphalt content of the emulsified asphalt was 30%~60%, the water could be directly added to the cold recycling mixture. The intensity of accelerated curing for two days at 40 °C was approximately equal to that of natural curing for three days, while that of accelerated curing for three days at 40 °C was approximately equal to that of natural curing for seven days, which provided a basis for the short-term laboratory test.

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Steering Performance Evaluation - Heavy-Duty Highway Tractor Wander Test

10.4271/1999-01-3764 ◽

1999 ◽

Author(s):

Edward M. DeWitt ◽

Michael L. Shirley ◽

Max L. Pace

Keyword(s):

Performance Evaluation ◽

Heavy Duty

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Modeling and performance evaluation of a heavy-duty vehicle based on the hydraulic power steering system

SIMULATION ◽

10.1177/0037549719866503 ◽

2019 ◽

Vol 96 (3) ◽

pp. 297-311 ◽

Cited By ~ 1

Author(s):

Hamze Ahmadi Jeyed ◽

Ali Ghaffari

Keyword(s):

Performance Evaluation ◽

Nonlinear Model ◽

Steering System ◽

Heavy Vehicle ◽

Heavy Duty ◽

Hydraulic Power ◽

Vehicle Performance ◽

Power Steering ◽

Heavy Duty Vehicle ◽

Hydraulic Power Steering

In most mathematical models that are presented for vehicle performance analysis, the dynamic role of the steering system is ignored and causes the steering effect on the vehicle overall response to be neglected. In this article, the main goal is the performance evaluation of a four-axle heavy-duty vehicle using the modeling and simulation of the vehicle and the hydraulic power steering (HPS) system. For this purpose, using Newton’s method, a 20-degrees-of-freedom (20-DOF) nonlinear model of the heavy vehicle is developed, and verified by the TruckSim software results. Then, the comprehensive 4-DOF model of the HPS system, including the steering handwheel angle, rack displacement, and left- and right-hand wheel angles, is presented. Finally, the dynamic model of the heavy-duty vehicle and the HPS system are combined and a 24-DOF dynamic model is simulated in MATLAB software. In order to evaluate the vehicle performance, the simulation on two maneuvers, namely parking and low-speed lane change maneuvers with load and no-load, are carried out. The simulation results demonstrate the desirable performances of the heavy vehicle based on the HPS system on the parking and low-speed maneuvering. Also, the research results provide a better understanding of the vehicle handling considering the nonlinear model of the heavy-duty vehicle based on the HPS system.

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