The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper conducted a review of relevant literature on energy recovery in water supply systems, stressing key elements such as system operation, design, application of and previous studies of energy recovery in water supply systems. The methodology comprised a discussion on the operation of the conduit hydropower system, the possible designs of the system and the implementation of the system within...
Welcome to the 11th article in the "Circuit Intuitions" column series. As the title suggests, each article provides insights and intuitions into circuit design and analysis. These articles are aimed at undergraduate students but may serve the interests of other readers as well. If you read this article, I would appreciate your comments and feedback as well as your requests and suggestions...
Nowadays, with the development of global energy crisis's compression and high fuel expenditure, the demands for energy saving and green emission of construction machineries, especially hydraulic excavators, have been rapidly increased. Meanwhile, the power efficiency of the conventional hydraulic excavators is very low. This study deals with the method to regenerate potential energy on the boom system...
This paper proposes a position control strategy for a pneumatic actuation system, which demonstrates high accuracy while it is subjected to a varying external force. We use a novel approach for the mathematical modeling of the pneumatic actuator: based on energy methods, we combine the kinetic and potential energy to derive the Lagrangian of the actuator and then the Euler-Lagrange equation of motion...
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 recycLing efficiently. This energy of traditional excavator is lost in the form of heat energy. It is wasteful and makes the component's Life. Researching on this system not only conform...
This paper discussed a new method of wave energy conversion (WEC), with a pump-based system simulating the function of heart pump. First, developments of wave energy conversion technology will be introduced. Then the mechanisms of animate heart, artificial heart and pump structure in the WEC device will be analyzed respectively. Thirdly, the relationship between wave forces and geometric figure is...
The mathematic model of single valve train, lagrangian formulation, is built up. Through it, the dynamic characteristics of the single valve train are simulated with MATLAB. The result indicates that the deformation of some parts of the valve train affects their dynamic coupling. So the acceleration of valve and contact force between the cam and running pulley fluctuate severely. The valve train dynamic...
Electro-hydraulic systems of heavy machines operating at different potential energy levels, using e.g. a lifting boom are evaluated. Practical results are found by using a light electro hydraulic forklift in measurements. A heavier diesel hydraulic forwarder is studied theoretically using the experimental results of the forklift as base data. An analysis of the efficiency of the energy recovery from...
Nowadays with the high fuel prices, the demands for energy saving and green emission of construction machinery, without sacrifice of working performance, safety and reliability, especially hydraulic excavators, has been highly increased. As a result, electro-hydraulic hybrid system, which are promoted and successfully applied to automobile industry, is recently introduced to hydraulic excavators....
Vibration of a hydraulic excavator's body and boom occurs when the boom quickly stops during upward or downward motion. The main objective of this research is to present an idea of suppressing the vibration. Several parameters which affect the vibration are defined and analyzed thoroughly and a method suppressing the vibration is presented in this paper for a specific real existing hydraulic excavator...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.