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2016-04-27 ...
  • April 27-29, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • November 2-4, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Hydraulic brake systems, one of the most important safety features on many road vehicles today, must meet manufacturer and customer requirements in addition to Federal Motor Vehicle Safety Standards. This course will analyze automotive braking from a system's perspective, emphasizing legal requirements as well as performance expectations such as pedal feel, stopping distance, fade and thermal management. Calculations necessary to predict brake balance and key system sizing variables that contribute to performance will be discussed.
2016-04-13
Event
The purpose of this session is to bring awareness among the automotive aerodynamics, thermal and hydraulic systems development community to address the need of reliability analysis and robust design to improve the overall product quality. This session also introduces CAE based optimization of aero-thermal and fluid systems to improve automotive fuel economy. This session presents papers covering both testing and simulation.
2016-04-05
Technical Paper
2016-01-0443
Han Zhang, Gang Li, Yu Wang, Yuchuan Gu, Xiang Wang, Xuexun Guo
A vehicular hydraulic electrical energy regenerative semi-active suspension(HEERSS) was presented, and its working principle and performance were analyzed. Firstly, configuration and working principle of the HEERSS were described; Secondly, kinetic equation of HEERSS was deduced, and a skyhook controller was designed for HEERSS. The traditional skyhook control strategy should be changed for the characteristic of HEERSS, because the damping force during extension stroke could be controlled, but not in compression stroke. Thirdly, the performance of HEERSS was compared with passive suspension(PS), traditional semi-active suspension(TSS). The simulation results showed that in the vehicle body resonance frequency and tire resonance frequency, the amplitude of suspension index parameters ranked in a descend order were PS, HEERSS and TSS; but in the transition frequency band, the amplitude of suspension index parameters ranked in a descend order were. TSS, HEERSS and PS.
2016-04-05
Technical Paper
2016-01-1139
Yong Liu, Biao Ma, Binjie Xu, Zhifen Miao
Currently the theoretical filtration ratio is generally used for measuring the filters for vehicle hydraulic transmission. But in actual use conditions, the filtration ratio of the filter is far less than the theoretical filtration ratio. According to the problem of how to determine the actual filtration ratio of hydraulic filters in different conditions and based on the working principle of filters, repetitive filtration ratio and repetitive contamination rate were definited, and model with dynamic filtration ratio was obtained. We simulated the contamination control model with dynamic filtration ratio, and analyzed the influence of repetitive filtration ratio and repetitive contamination rate on dynamic filtration ratio. The variation of dynamic filtration ratio was validated through a series of experiments in different condition of flow rates, pressures and temperatures.
2016-04-05
Technical Paper
2016-01-1561
Xinxin Shao, Haiping Du, Fazel Naghdy
Significant steering and braking maneuvers in vehicles generally induce significant amount of roll and pitch rotations, which have adverse effect on the directional stability and handling of the vehicle. Furthermore, the excessive pitch motions of the vehicle could adversely affect the driver’s perception of the path and preview ability. Hence, it is crucial to control vehicle attitude (roll and pitch rotations) in response to directional maneuvers and excitations arising from road. Development of a passive anti-pitch anti-roll hydraulically interconnected suspension (AAHIS) with the advantage of improving the directional stability and handling quality of a vehicle is presented. A 7 degrees-of-freedom full car model and a 20 degrees-of-freedom anti-pitch anti-roll hydraulically interconnected suspension model dynamically coupled together through boundary conditions, are developed and used to evaluate vehicle handing dynamic responses under steering/braking maneuvers.
2016-04-05
Technical Paper
2016-01-0283
Joydip Saha, Harry Chen, Sadek Rahman
More stringent Federal emission regulations and fuel economy requirements have driven the automotive industry toward more sophisticated vehicle thermal management systems which may include various new technologies such as active grill shutter, variable coolant flow control devices, PWM controlled fan and control strategies in order to best utilize the waste heat and minimize overall power consumption. With these new technologies and new devices, the comprehensive vehicle-thermal-system simulation tools are essential to evaluate and develop the optimal system solution for new cooling system architectures. This paper will discuss how the model-based vehicle thermal system simulation tools have been developed from analytical & empirical data, and have been used for assessment and development of new cooling system architectures.
2016-04-05
Technical Paper
2016-01-1550
Ming Peng, Xuexun Guo, Junyi Zou, Chengcai Zhang
This paper presents a novel concept of the application of the hydraulic electromagnetic energy-regenerative shock absorber (HESA) into the commercial vehicle suspension system and the vehicle road performances are simulated by the evaluating indexes (e.g. the root-mean-square values of vertical acceleration of sprung mass, dynamic tire-ground contact force, suspension deflection and harvested power). Firstly, the configuration and working principle of the HESA are introduced. Then, the damping characteristics of the HESA and the seven-degrees-of-freedom vehicle dynamics were modeled respectively before derive the dynamic characteristics of a vehicle equipped with the HESA. The control current is fixed at 7A to match the similar damping effect of traditional linear damper on the basis of the energy conversion method of nonlinear shock absorber.
2016-04-05
Technical Paper
2016-01-0454
Hongyu Zheng, Shenao Ma
As a new braking system, EHB can significantly improve the braking performance and vehicle handling and stability. A number of factors impacts the EHB system characteristics, wheel cylinder pressure are regulated by in-solenoid and out-solenoid valve, the dynamic response of the control strategy will impact the accuracy of wheel cylinder pressure greatly. In this paper the structure of high-speed on-off valve and the valve core principle are discussed, the paper also analysis the response of the valve core under different modulation frequency and duty cycle and the change of wheel cylinder pressure. Setting a proper modulation frequency to make sure that electromagnetic valve can be worked in a greater linear range.
2016-04-05
Journal Article
2016-01-0280
Alaa El-Sharkawy, Amr Sami, Abd El-Rahman Hekal, Dipan Arora, Masuma Khandaker
`In this paper, the development a transient thermal analysis model for the exhaust system is presented. Given the exhaust gas temperature out of the engine, a software tool has been developed to predict changes in exhaust gas temperature and exhaust surface temperature under various operating conditions. The software is a thermal solver that will predict exhaust gas and wall surface temperature by modeling all heat transfer paths in the exhaust system which includes multi-dimensional conduction, internal forced/natural convection, external forced/natural convection, and radiation. The analysis approach involves the breaking down of the thermal system into multiple components, which include the exhaust system (manifold, takedown pipe, tailpipe, etc.), catalytic converter, DPF/GPF (diesel particulate filter or gasoline particulate filter), if they exist, thermal shields, etc.
2016-04-05
Technical Paper
2016-01-0099
Deepak Venkatesh, Arockia Selvakumar
The concept of camless engines enables us to optimize the overall engine efficiency and performance, as it provides great flexibility in valve timing and valve displacement. This paper deals with design of camless engines with pneumatic actuator. The main objective of this research is to build a prototype and test its performance at different engine speeds. Also an extensive research on the sensors is done to detect the various sensors that could be used to identify the crankshaft position. In addition the overview of the proposed camless engine system is focused with the design principles and the components used. The developed pneumatic system is capable of actuating at 1500 rpm and demonstrates the ability of pneumatic actuators to be used in an internal combustion engine with low rpm needs.
2016-04-05
Journal Article
2016-01-1376
Feng Qi, Sujan Dhar, Varun Haresh Nichani, Chiranth Srinivasan, De Ming Wang, Liang Yang, Zhonghui Bing, Jinming Jim Yang
External gear pumps are positive displacement devices which perform with excellent efficiencies over a wide load and speed range. This wide range of performance is primarily due to micron-level leakage gaps in such machines which prevent large leakages at increasing loads. The present paper details a novel approach implemented in the commercial CFD tool PumpLinx that can capture the details of the micron level gaps, and model such machines accurately. The steps in creation of the model from original CAD geometry are described. In particular, the CFD mesh is created using a specialized template structured meshing method within PumpLinx especially created for external gear pumps and motors. This makes process of mesh creation and flow solution through complicated geometries of a gear pump efficient and streamlined.
2016-04-05
Journal Article
2016-01-0281
Alaa El-Sharkawy, Dipan Arora, Abd El-Rahman Hekal, Amr Sami, Muhannad Hendy
In this paper, transient component temperatures in the vehicle under-hood and underbody are estimated. The main focus is on the component temperatures as a result of radiation from exhaust, convection by underbody or under-hood air and heat conduction through the components. The exhaust surface temperature is simulated as function of time and for various vehicle duty cycles such as city traffic, road load and grade driving conditions. At each time step the radiation flux to the surrounding component is estimated, heat addition or removal by convection is evaluated based on air flow, air temperature and component surface area. Geometrical properties of the components are obtained by fitting them into pre-set shapes (e.g., cylinders, spheres, ellipsoids, etc.).
2016-04-05
Journal Article
2016-01-1646
Tao Xu, Yanhua Shen, Wenming Zhang
The traditional hydraulic steering mode in articulated motor-driven vehicle is liable to make the vehicle’s structure more complex and damage the joint body when steering. Thus the skid-steering mode could be implemented to replace the hydraulic steering mode in articulated vehicle, which is without steering cylinder but more flexible by controlling the velocity of each wheel when steering. This paper will introduce the skid-steering principle and establish the in-situ skid-steering dynamic model of articulated motor-driven vehicle according to the theory of traditional wheeled vehicle’s skid-steering and dynamic analysis of hydraulic steering of articulated vehicle. Based on the model, the vehicle trajectory and dynamic relationships among the body structure, longitudinal forces and lateral forces between each tire and the ground will be described.
2016-04-05
Technical Paper
2016-01-1647
Jing Li, Xiong Yang, Hui Miao, Zheng Tang Shi
A program of integrated braking control system is proposed, and its structural composition and working principle is analyzed. According to the structural and mechanical characteristics of all key components, through some reasonable assumptions and simplifications, a motor, a brake master cylinder, four brake cylinders, solenoid valves and ESC algorithm models are set up based on the Matlab/Simulink software. Finally, after the assembly of each sub-model is complete and combining a vehicle which is set up in a carsim software environment, simulation tests and comprehensive performance analysis of the active safety stability control for a vehicle in double lane change and single lane change situations is carried out respectively.
2016-04-05
Journal Article
2016-01-0282
Julio Abraham Carrera
Recent emissions standards have become more restrictive in terms of CO2 and NOx reduction. This has been translated into higher EGR rates at higher exhaust gas temperatures with lower coolant flow rates for much longer lifetimes. In consequence, Thermal Load for EGR coolers has been increased and boiling and its interaction with thermal fatigue are now a critical issue during their development. It is almost impossible to avoid localized boiling inside an EGR cooler and, in fact, it would not be strictly necessary when it is below the Critical Heat Flux (CHF). However when CHF is exceeded, film boiling occurs leading to the sudden drop of the heat transfer rate and the metal temperature rise. In consequence, thermal stress increases even when film boiling is reached only in a small area inside the part. It is very difficult to accurately predict under which conditions CHF is reached and to stablish the margins to avoid it.
2016-02-11
WIP Standard
ARP1961A
This SAE Aerospace Recommended Practice (ARP) addresses the characteristics required for the definition, development, and acquisition of a satisfactory airframe mounted accessory gearbox (AMAG).
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