Applied Mechanics and Materials Vol. 822

Abstract: This paper shows how to calculate the speed of travel for a tractor equipped with an additional transmission (hydrostatic transmission). Determination is theoretically and experimentally, comparing the results. Theoretical calculation is done using MathCAD program. An experimental measurement is determined by the device called “fifth wheel", equipped with speed measuring transducer.

Abstract: The purpose of this research is to develop a motorized wheelchair, to meet the special requirements of indoor use. A wheelchair prototype is developed, which uses two motors, controlled by a PWM controller. The PWM controller is based on a L298N Dual H-Bridge Motor Controller module with an Arduino board. The prototype has the ability to perform forward/backward motion and steering. These functions are controlled by a joystick mechanism, operated by disabled human. As a drive train from motors to wheels are used chain transmissions. Drive trains convert high motor speed to lower speeds but with increased torque. The proposed design solution allows wheelchair folding for transportation. Experimental tests carried out gives us a kinematic and dynamic characterization of the wheelchair.

Abstract: In this paper is presented a comparison between the obtained start-acceleration of a vehicle with wheels and one tracked. Experiments performed in this regard were conducted on three types of surfaces like parquet, carpet and sand. The vehicles chosen for testing were a remote-controlled mini-vehicle (wheeled locomotion system) and Spy Video TRAKR (locomotion system tracked). In order to determine the acceleration, the vehicles were equipped with ultrasonic sensor DT020-1 and data acquisition system MultiLogPRO, running connected to a PC or as a standalone device.

Abstract: The thermo-hydraulic single regime operating generator is an innovative concept developed for the propulsion of road vehicles. The aim of the paper is to calculate the pressure losses in the hydraulic circuit of the single regime running thermo-hydraulic generator. The calculus is based on a modular approach proposed by. The pressure of the hydraulic liquid is determined by taking into consideration the local and the linear pressure losses in the system. These pressure losses are calculated applying classic formulas. This is important because the free piston displacement depends on the pressures acting on the side surfaces. The calculus algorithm is based on the constructive data of an experimental model.

Abstract: In this paper a robotic system which consists in a mobile platform with wheels and a robotic arm that operates in cylindrical coordinates which are located on, having a tentacular end-effector that executes specific grasping operations is presented. The robotic system executes: the displacement in the operation field, towards a target point that has been priori established, positioning the arm in order to perform the specified task, and the end-effector task according to a tentacular model. Kinematic models are made by Denavit – Hartenberg method and dynamic models by Lagrange method. Finally, is proposed a control system with uncoupled components.Keywords: mobile platform, tentacular structure, observer.

Abstract: Slip angle is the difference between the direction a vehicle is travelling and the longitudinal plane of the vehicle body. Knowing vehicle sideslip angle accurately is critical for active safety systems such as Electronic Stability Program (ESP). Vehicle sideslip angle can be measured using optical speed sensors, inertial sensors and/or dual-antenna GPS receivers. These systems are expensive and their use is limited for many users. The goal of this paper is to analyze the possibility to estimate the vehicle sideslip angle, in real-time, by using two low-cost single-antenna GPS receivers.

Abstract: The electrification of the powertrain is one of the best solutions in the quest for obtaining emissions within the even more narrow limits imposed by legislation, with no penalty to the dynamic performances of the vehicle. This article describes a study regarding the possibilities of hybridization of a road vehicle. Based on real life situations, the custom driving cycles have been defined by means of GPS tracking. These driving patterns were further used in a simulation environment to test various configurations of classical and hybrid powertrains. The performances of the vehicle before and after hybridization were compared pursuing the change in emissions and fuel consumption.

Abstract: There is an ever increasing demand for use of inductive speed sensors in a broad range of applications. They are used in typical applications such as cam and crank shaft position/speed and wheel and turbo shaft speed measurement. This paper describes the type of inductive sensor found on vehicles and the difficulties of detecting at low speeds. In the laboratory of Mechatronics an experimental device has been done to measure the speed using an inductive speed sensor. The experimental results are satisfactory and show the possibility of the inductive sensors to be used in automotive industry.

Abstract: The authors present in this paper the opportunities offered by the use of software platforms (MULTISIM) in the validation of informational systems for optimizing economical consumption. So after some research (based on identification methodology system type) a physical-mathematical model can be developed that offers the possibility to optimize fuel consumption in the economy pole depending on specific correlations of operating regimes. Resulted relationships allow designing of information systems by proposing solutions which acquire information on movement speed, engine RPM in load (by determining the actual torque through correlations of exhaust gas temperature, moment and torque).Having these relationships we can design, for example, system version with discrete components or with digital system for surveillance engine operation.

Abstract: One of the main methods to evaluate, to investigate and to integrate the behavior of security systems within the automotive design is by using modeling and simulation. Due to the fact that the ECUs represent more than 57% from vehicle architecture and they are using protocols to communicate through the CAN networks many possibilities for breaking security of the vehicles successfully may appear. In order to understand all of these aspects and to be able to create a simulation model for immobilizer systems, it is mandatory to represent the features and functions of all components of this kind of systems. Developing a immobilizer model include the possibility of testing virtual models in different conditions and for different functioning modes.