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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.
2016-04-05
Technical Paper
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
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
2016-01-1376
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
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
2016-01-1550
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.
2016-02-02
WIP Standard
AS6376
NEW PART STANDARDS TO BE ADDED TO THE PART FAMILY LISTS PER THE REQUIREMENTS OF AS4459
2016-02-01
Technical Paper
2016-28-0237
Vinod Verma, V Saravanan, Dinesh Redkar, Arun Mahajan, R Raja, Pankaj Pawar, Ashok Kumar
Abstract A hydraulic power train assembly of an agricultural tractor is meant to lift the heavy implements during field operations and transportation. As it is a crucial member of the tractor for its usage, so the power train assembly needs a properly designed lift arm, rocker arm assembly with better strength and stiffness. There are a standard like IS12224, IS4468 which regulates the test method for hydraulic power and lift capacity of tractor and the layout of hydraulic three point linkage. Computer aided engineering techniques followed by laboratory testing have been deployed in the earlier stages of the product design & development itself to deliver the first time right products to the customer. In this paper, a virtual simulation process has been established to design an agricultural tractor hydraulic lift arm to meet the above requirements. A Design Verification Plan (DVP) has been developed consisting of 3 load cases.
2016-01-27
WIP Standard
AS4273B
This document establishes requirements, test procedures, and acceptance criteria for the fire testing of fluid handling components and materials used in aircraft fluid systems. It is applicable to fluid handling components other than those prescribed by AS1055 (e.g., hoses, tube assemblies, coils, and fittings). It also is applicable to materials, wiring, and components such as reservoirs, valves, gearboxes, pumps, filter assemblies, accumulators, fluid-cooled electrical/electronic components, in-flight fluid system instrumentation, hydromechanical controls, actuators, heat exchangers, and manifolds. These components may be used in fuel, lubrication, hydraulic, or pneumatic systems.
2016-01-26
WIP Standard
AS5958F
This SAE Aerospace Standard (AS) establishes the requirements for externally swaged titanium tube fittings on titanium and CRES tubing with flareless separable fitting for use in hydraulic supply and return aerospace fluid systems up to operating pressure of 5080 psig (35 000 kPa) maximum and an operating temperature range of -65 to +275 °F (-54 to +135 °C). This specification covers a common 5080 psi pressure titanium fitting that may be used for a range of operating pressures up to 5080 psi with different tubing materials and tubing wall thicknesses, and is assembled with the same tooling in accordance with AS5959. The fitting operating pressure is based on the fitting thread pitch. Extra fine pitch for 5080 psi operating pressure and fine pitch for operating pressures 3000 psi and less. Table 12 shows applicable aerospace fitting part number standard and tubing materials and operating pressures.
2016-01-15
Standard
AS5467
This specification establishes the design, performance, and test requirements for hydraulic flow rate fuses intended to be used for hydraulic circuit protection on aircraft.
2016-01-12
WIP Standard
J1707
This SAE Recommended Practice provides basic recommendations for dispensing and handling of SAE J1703 and SAE J1704 Brake Fluids by Service Maintenance Personnel to assure their safe and effective performance when installed in or added to motor vehicle hydraulic brake actuating systems. This document is concerned only with brake fluid and those system parts in contact with it. It describes general maintenance procedures that constitute good practice and that should be employed to help assure a properly functioning brake system. Recommendations that promote safety are emphasized. Specific step-by-step service instructions for brake maintenance on individual makes or models are neither intended nor implied. For these, one should consult the vehicle manufacturer’s service brake maintenance procedures for the particular vehicle. Vehicle manufacturer’s recommendations should always be followed.
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