Applied Mechanics and Materials Vols. 592-594

Abstract: The hydrostatic transmission energy-saving system is proposed in this paper. The efficiency of the primary power source improves by system. The system is energy regenerative, highly efficient even under partial load conditions. It can work in either a flow or pressure coupling configuration allowing it to avoid the disadvantages of each configuration. The displacement variation in the secondary unit was reduced, increasing the uses of several types of hydraulic pump/motors. The proposed system was modeled based on its physical attributes. A hierarchal control system was implemented and focused on the design of an adaptive fuzzy sliding mode control for speed control of the secondary unit. The energy utilization and the influences on the energy-recovery potential of the system were analyzed.Keywords-Hydrostatic drive, energy saving system, Regenerative systems

Abstract: It is proposed to determine the velocity of the embedded mobile robot in a real world test environment .The test environment considered in this work is the man-made road surfaces like cement road surface, sand road surface, Bituminous Thar road surface, Grass road surface and loose gravel road surfaces etc. First, fuzzy logic control of velocity estimation a mobile robot is done using Matlab for the different surfaces. Then the real time tests on the different surfaces were carried out. The simulated values are compared with the test values. The comparison showed that the simulation values were close to the real time test values.

Abstract: XY positioning stages are fundamental components during precision manipulation of micro sized objects. A compliant mechanism based mechanism is the appropriate choice for the design of XY stage. Topology optimization techniques are utilized to design the compliant mechanism. During the process of topology optimization, senseless regions are appearing from the manufacturability perspective. Senseless regions are staircase boundaries and node to node connectivity which is impossible to manufacture. Interpolation function is included in the topology optimization to minimize the effect of senseless regions. However topologically developed design is post processed to attain the manufacturability. Structural performance of the post processed final design is validated through Finite Element Method (FEM) and experimental technique.

Abstract: AGV is mostly used in industrial application to move material around manufacturing facility. Here assembling of AGV is done by using components like chassis, wheels, wiper motors, gear motor, LED sensors, tactile sensor, actuators etc. AGV is designed with the help of electrical design of sensors which are used to control AGV during operation when it is moved on guided path. AGV design was modelled and simulated using catiaV5 software .Design was modelled and drawing preparation was done using catiaV5.Static analysis was done for stress using catiaV5 .Here principal stresses at different point were obtained having different deflection .Graphs are plotted for principal stress verses deflection and Navigation performance of AGV uses electric motor .Thus AGV is used to pick up the object with proper gripping system. A navigation system has been developed using sensors. AGV contains software and hardware components and is primarily used for material handling in industries. Static analysis was done for stress using catiaV5. Graphs are plotted for principal stress vs. deflection. The same analysis can be done for different material depending on loading condition. Stress analysis concept can be used to study dynamic analysis. Optimization of AGV can be possible by using different material. To evaluate the performance simulations were conducted using catiaV5 maintaining a constant setup inputs all over. Index Terms: Catia, navigation,optimization

Abstract: Electro-Hydraulic Actuator (EHA) replaces centralized hydraulic system by a local compact actuator system. It is gaining more attention due to its compactness and reliability. The control method should be appropriate to achieve accurate position control and stability. The EHA system model is developed in AMESim software and Proportional-Integral-Derivative (PID) control is used for position tracking of the cylinder. Design Exploration facility of AMESim software provides a platform to optimize PID parameters using Genetic Algorithm (GA). Simulation results show that position tracking with no overshoot and less settling time.

Abstract: In this paper, a new hydraulic energy-regenerative model was offered from its application through modelling to its control. The model was constructed on a closed-loop hydrostatic transmission and used a hydraulic accumulator as the energy storage system invented in a new configuration to recover the kinetic energy without any return of the fluid flow. The displacement deviation in the secondary unit was reduced, increasing the uses of several types of hydraulic motor/pumps. The proposed system was modelled based on its physical features. The energy consumption and the influences on the energy-recovery potential of the system were analyzed. Simulation and experiments were performed to evaluate the validity of the employed mathematical model and the effectiveness of the control system. Keywords: Hydraulic accumulator, Hydraulic system, Energy recovery.

Abstract: In this article a negative feedback Proportional Integral (PI) control of pump displacement is presented to attain desired speed of hydromotor in the loading circuit of a pedagogical open loop Hydrostatic transmission system (HST) under varying load condition. By using the state equations derived from model, a novel system inversion procedure is proposed to obtain the required pump displacement. The control strategy through system inversion is validated through bond graph model simulation.

Abstract: Environmental and energy issues demand the construction equipment industry to develop more efficient and energy saving machines as they have done to the automotive industry in the last decade. This energy of traditional excavator is lost in the form of heat energy. Heavy earth moving equipments such as excavators, loaders and forklift trucks have unique power train mechanism, thus the focus on important issues like efficiency improvement or energy savings holds great value. Hence, the need of the hour is to develop machinery which can match the necessities and challenges of the ever evolving industry in terms of energy saving management. In this context, hybrid excavators have been ushered in currently. Here system translates the arm/boom/buck’s potential energy into electrical energy and then the electrical energy is stored in a storage device. It develops a set of energy management strategy to make the recoverable energy usage efficiently. The advancements in the field of heavy machineries holds key in future of hybrid excavators. Keywords-hybrid excavator; potential energy recovery; arm; energy saving

Abstract: Nowadays with the high fuel costs, the stress for energy saving and green emission of construction machineries, while not sacrifice of the operating performance, safety and dependableness, particularly for hydraulic excavators (HYEXs), are extremely exaggerated. As a result, electro-hydraulic actuators (EHA), that is promoted and with success applied to industry, is recently introduced to HYEXs. The aim of this paper is to propose a new style of excavator - electrical excavator (ELEX) - with energy saving capability using the EHAs. Each of the hybrid actuators is driven by an electrical motor/generator for retrieving a potential energy or a kinetic energy at the time of lowering or slewing stoppage of the excavator. An excavator having a hybrid boom system (HBS) is analyzed. Finally, operating efficiency and energy consumption of the projected excavator area unit are clearly studied. Keywords: Hydraulic excavator; electric excavator; electro-hydraulic actuator; control

Abstract: Magneto-rheological fluids are smart fluids displaying flow properties that can be adjusted by the introduction of magnetic fields. Conventional brakes require complex mechanical parts to dissipate energy, they are having more weight, produce less braking torque and the time of response is about 300-500 milliseconds and hence brake distance is high. A Magneto-rheological fluid brake is efficient than conventional braking system in terms of the weight reduction, and response time. In this paper MR fluid is prepard and an improved MRB design is made, taking into account the temperature effects and more accurate description of the material properties as well. The proposed work is concerned with the development of a new Brake-by-wire system which employs MRF as working medium. The design procedure comprises the selection of materials for MRB, creating an analytical model for finding the braking torque produced by the MRB and Finite Element Analysis of the MRB.