Essential Criteria for Handling Measurement of a Ground
Introducing Essential Criteria for Handling Measurement of a Ground Vehicle
Ehsan G. Naeini, Hassan Sayyaadi2, Mahmoud Saadat3
1Master of Science, Sharif University of Technology; ehsan_naeini@alum.sharif.edu
2Proffessor Associate, Sharif University of Technology; sayyaadi@sharif.edu
3Proffessor Assistant, Sharif University of Technology; m_saadat@sharif.edu
Abstract
Handling behavior of a ground vehicle is one of main properties of a vehicle that play an important role in technical and commercial evaluation of a vehicle. The frequency weighted mean square value of the vertical acceleration is a well-known criterion for ride comfort. For handling, several criteria have been put forward, which are to a more or lesser extent dependent on driver input and each car company select some of these criteria as major criteria for their design, with attention to car application, consumption bazaar, environment and road condition. Off-road test is one of the best choices for handling quality evaluation of a vehicle, in which some properties of vehicle are measured by diverse sensors that fixed on vehicle. Resultant of these sensor 's data and professional driver 's opinion is good criterion in handling evaluation. In this work we performed some objective steady state tests (CRC) and objective transient tests (impulse steering input) on five most common vehicles in Iran and recorded different sensor 's outputs and obtained some quantities. Also we performed some subjective test with professional drivers and their opinions about handling quality were recorded with scores between 1 and 20. Then we will introduce 3 criteria, side slip angle and roll angle and time lag between steering input and lateral acceleration as most essential criteria in handling measurement, and then we will show a good agreement between categorizing these five vehicles according to each these 3 criteria and categorizing them according to drivers’ scores.
Keywords: Handling Criteria, Roll
Ehsan G. Naeini, Hassan Sayyaadi2, Mahmoud Saadat3
1Master of Science, Sharif University of Technology; ehsan_naeini@alum.sharif.edu
2Proffessor Associate, Sharif University of Technology; sayyaadi@sharif.edu
3Proffessor Assistant, Sharif University of Technology; m_saadat@sharif.edu
Abstract
Handling behavior of a ground vehicle is one of main properties of a vehicle that play an important role in technical and commercial evaluation of a vehicle. The frequency weighted mean square value of the vertical acceleration is a well-known criterion for ride comfort. For handling, several criteria have been put forward, which are to a more or lesser extent dependent on driver input and each car company select some of these criteria as major criteria for their design, with attention to car application, consumption bazaar, environment and road condition. Off-road test is one of the best choices for handling quality evaluation of a vehicle, in which some properties of vehicle are measured by diverse sensors that fixed on vehicle. Resultant of these sensor 's data and professional driver 's opinion is good criterion in handling evaluation. In this work we performed some objective steady state tests (CRC) and objective transient tests (impulse steering input) on five most common vehicles in Iran and recorded different sensor 's outputs and obtained some quantities. Also we performed some subjective test with professional drivers and their opinions about handling quality were recorded with scores between 1 and 20. Then we will introduce 3 criteria, side slip angle and roll angle and time lag between steering input and lateral acceleration as most essential criteria in handling measurement, and then we will show a good agreement between categorizing these five vehicles according to each these 3 criteria and categorizing them according to drivers’ scores.
Keywords: Handling Criteria, Roll
References: [1] British Standards Institution. British Standard Guide to Measurement and Evaluation of Human Exposure to Whole Body Mechanical Vibration and Repeated Shock. BS 6841, 1987. [5] Sharp RS, Pan D. On active control for automobiles. In: 12th IAVSD Symposium August 26–30, 1991. Suppl. to Veh. Sys. Dyn. 20. [6] Crolla DA, Chen DC, Whitehead J P, Alstead CJ. SAE Technical Paper No. 980226, 1998. [7] Reichardt W. Correlation analysis of open/closed loop data for objective assessment of handling characteristics of cars. SAE Technical Paper No. 910238, 1991. [8] National Highway Safety Administration, 2000. Roll over prevention Docket No. NHTSA-2000-6859 RIN 2127-AC64.Availablefrom: www.nhtsa.dot.gov/cars/rules/rulings/Roll_over/Chapt03.html. Accessed September 2002. [11] Dahlberg E. A method determining the dynamic roll over threshold of commercial vehicles. SAE paper 2000-01-3492. 2000.