The hybrid vehicle is a new type of green and energy efficient vehicle. Hydraulic accumulator and variable pump/motor make up the break energy regeneration utilization system, which is the core of hydraulic auxiliary driving unit. The hybrid drive system is composed of hydraulic auxiliary driving unit and the original vehicle drive system. As it relates to the recovery of the braking energy and...

This paper presents the design of a highly efficient pneumatic motor system. The air engine is currently the most generally used device to convert potential energy of compressed air into mechanical energy. However, the efficiency of the air engines is too low to provide sufficient operating range for the vehicle. In this study, the energy contained in compressed air/pressurized hydraulic oil is...

Flooding is an international problem that represents the most common and destructive of all weather-related natural hazards. Moreover, man-made interventions such as deforestation, clearance of land and the poor design of hydraulic works such as bridges and culverts can often intensify that risk. This paper demonstrates a complete hydraulic study that was performed in a culvert located in Lofor...

This paper describes the WaterWiSe@SG WSNbased system that is deployed within an operating water distribution network in Singapore. The system enables continuous monitoring of hydraulic parameters in the water distribution network and provides a real-life hydraulic testbed on which to perform field experiments. To date we have deployed 8 sensor nodes over a section of downtown Singapore, sampli...

A car suspension incorporating a Lotus actuator and a TVR suspension/wheel unit is studied both experimentally and analytically. An emphasis is placed on hydraulic modelling using a series of transfer functions linking the hydraulic and suspension components. This is signi cantly aided by the use of a Moog 2000 programmable servo controller (PSC ) to equalize the extending and retracting ow gai...

Hydraulics is the branch of civil engineering related to the science of water in motion, and the interactions between the fluid and the surrounding environment. It is shown that hydraulic engineers were at the forefront of science for centuries. The end of the 20th century marked a change of perception in our society for hydraulic engineering. Is there a need for further hydraulic engineering ?...

This paper will address two issues associated with the implementation of a hydraulically powered dissimilar muster-slave teleoperated system. These issues are the overall system control architecture and the design of robust hydraulic servo controllers for the position control problem. Finally, a discussion of overall system performance on an actual teleoperated system will be presented. (Schill...

Channel improvements involving channel expansion upstream of culverts may result in increased sediment deposition near the structure, which in turn may result in decreased hydraulic performance and safety. These conditions are investigated through physical and numerical modeling. An improved understanding of the hydraulic performance of channel expansions is developed, improved performance curv...

Uncertainty due to spatial variability of hydraulic conductivity is explicitly incorporated into a procedure for the optimal design of aquifer remediation strategies. The management procedure is based on the stochastic approach to groundwater flow and contaminant transport modelling, in which the hydraulic conductivity is represented as a random field. The remediation design procedure begins wi...