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REDUCTION OF STEERING VIBRATION WITH THE APPLICATION OF DYNAMIC TESTING AND ANALYSIS

John Deere India Pvt Ltd.-Amol Pimpale, Prashant Bardia, Pankaj Vaste, Rohit Pawar
  • Technical Paper
  • 2019-28-2421
Published 2019-11-21 by SAE International in United States
KEYWORDS: Steering System, Engine Vibrations, Dynamics, Modal Testing, Modal Analysis, ABSTRACT - In modern agriculture, the tractor’s use is indispensable and essential for various operations like cultivation, soil preparation, pulverization and many more. However, despite being efficient machines, tractors may be subjected to different level of vibrations in various parts of their structure. The vibration often plays the key cause of invalidation and component failures and also, affecting the ride and comfort. Since it is known that such vibration factors can affect the behavior in many ways, an understanding of their dynamic response is warranted. In this paper, case study related to reduction of steering system vibration is presented. Objective and Background: Vibration reduction is linked with the reduction either at source or on path. For such, it is necessary to know the reality of machines, component and mechanisms to mitigate the vibration levels on the tractor. From the testing and analysis of the components, it is possible to calculate the dynamic properties and vibration average level. The vibration reduction decreases the damages caused by…
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Composite Steering Strategy for 4WS-4WD EV Based on Low-Speed Steering Maneuverability

Tongji University-Yang Yang Wang, Zhi Guang Liu, Yuan Xing Jiang
Published 2019-11-04 by SAE International in United States
A composite steering control strategy, which combines four-wheel steering (4WS) and differential steering, is proposed in this paper, to optimize steering maneuverability in the conditions where the vehicle speed is below 15 Km/h, mainly for U-turning and parking conditions. A dynamic model is developed for the steering system and the tire system. Taking different steering wheel inputs into consideration, a 4WS control strategy proportional to the front wheel steering angle is quoted to improve the steering maneuverability in the low speed conditions and guarantee the manipulability by controlling the side slip of the vehicle. Based on the 4WS system, this paper explores the possibility of further improving the low-speed maneuverability of the vehicle through differential steering. And the differential steering control strategy is developed, including four hub-motor output modes. A composite steering controller is designed based on the 4WS-4WD electric vehicle platform. Through the real vehicle calibration tests, the output torque distribution coefficient of the hub motor in the differential steering control strategy is obtained, and the composite steering control strategy optimal for maneuverability is…
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Research on Control Algorithm of Active Steering Control Based on the Driver Intention

Jilin University-Pengcheng Zhang, Hongyu Zheng
Published 2019-11-04 by SAE International in United States
Active steering technology can improve the operability of the driver by the involvement to the steering system. Driver is the major controller of the vehicle Therefore, the involvement of advanced technologies including the active steering technology shouldn’t interfere with the intention of the driver, and the driver should still have great control of the vehicle. The aim of this paper is to solve the problem of the driver’s control when the active steering system works to improve the flexibility of the low speed and the stability of the high speed, and the active steering model based on the driver’s steering intention is established. Through the CarSim simulation software, this paper adopts 9 parameters related to the vehicle steering of the DLC (Double Line Change). And PCA (Principal Component Analysis) algorithm, a tool of statistical analysis, is applied to select 4 parameters which can stand for the DLC from the 9 parameters, which makes the data processing easier. Through the 4 parameters, this model divide the driver’s steering intention into four categories (emergency steering, normal steering,…
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Towability Design Criteria and Equipment Use - Passenger Cars, Vans, and Light-Duty Trucks

Motor Vehicle Council
  • Ground Vehicle Standard
  • J1142_201910
  • Current
Published 2019-10-28 by SAE International in United States
This SAE Recommended Practice describes the type of equipment commonly used with towing equipment, provides information to calculate safe steering loads, and outlines design criteria.
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Towing Equipment Ratings and Practices

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2512_201910
  • Current
Published 2019-10-24 by SAE International in United States
This SAE Recommended Practice applies to all trucks that are equipped with armlift bodies, carrier bodies, wheel lift bodies, wrecker, and underlift bodies. Additional rating methods are provided for tow slings, truck hitches, and chain assemblies.
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A Dictionary of Terms for the Dynamics and Handling of Single Track Vehicles (Motorcycles, Scooters, Mopeds, and Bicycles)

Motorcycle Technical Steering Committee
  • Ground Vehicle Standard
  • J1451_201909
  • Current
Published 2019-09-24 by SAE International in United States
Terminology within this document is limited to the dynamics and handling characteristics of single track, two-wheeled vehicles.
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Hydraulic Pump Airborne Noise Bench Test

Vehicle Performance Steering Committee
  • Ground Vehicle Standard
  • J2747_201909
  • Current
Published 2019-09-13 by SAE International in United States
Communicate the process of accurately measuring sound power levels of positive displacement hydraulic pumps commonly used in ground vehicle steering systems. This recommended practice defines the pump mounting (pulley, belt tension, isolation), operating conditions (fluid, speed, temperature, pressure), room acoustics, instrumentation, noise measurement technique and data acquisition setup to be used. Included are recommendations for test sample size, and format for data presentation/reporting.
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Steering for Off-Road, Rubber-Tired Machines

OPTC1, Personnel Protection (General)
  • Ground Vehicle Standard
  • J1511_201907
  • Current
Published 2019-07-29 by SAE International in United States

This SAE Standard applies to off-road rubber-tired machines having rated speed capability exceeding 20 km/h.

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Hot New ‘Hands-On’ Direction in ADAS Safety Research

Autonomous Vehicle Engineering: July 2019

Stuart Birch
  • Magazine Article
  • 19AVEP07_10
Published 2019-07-01 by SAE International in United States

JLR researches use of steering wheel heating and cooling to reduce driver workload

Jaguar Land Rover (JLR) recently revealed novel research into a driver-safety aid: a sensory steering wheel rim that heats or cools on each side to warn of upcoming GPS-directed maneuvers-plus serves as an extra information source in low-visibility situations.

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A Control Strategy to Reduce Torque Oscillation of the Electric Power Steering System

Concordia University Montreal-Subhash Rakheja
South China University of Technology-Duo Fu, Wen-Jun Yan, Wen-Bin Shangguan
Published 2019-06-05 by SAE International in United States
This paper proposes a new evaluation method of analyzing stability and design of a controller for an electric power steering (EPS) system. The main purpose of the EPS system’s control design is to ensure a comfortable driving experience of drivers, which mainly depends on the assist torque map. However, the high level of assist gain and its nonlinearity may cause oscillation, divergence and instability to the steering systems. Therefore, an EPS system needs to have an extra stability controller to eliminate the side effect of assist gain on system stability and attenuate the unpleasant vibration. In this paper, an accurate theoretical model is built and the method for evaluating system quality are suggested. The bench tests and vehicle experiments are carried out to verify the theoretical analysis. The evaluation method proposed in this paper can not only guide the design of controller parameters, but also evaluate the control effect while the performance of several controllers are all excellent.
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