Nowadays, hydropower plays an essential role in the energy market. Due to their fast response and regulation capacity, hydraulic turbines operate at off-design conditions with a high number of starts and stops. In this situation, dynamic loads and stresses over the structure are high, registering some failures over time, especially in the runner. Therefore, it is important to know the dynamic r...

Hydraulic system has been the mainstream choice in large engineering equipment due to its smooth transmission, bearing capacity, and small volume. However, because of tightness invisibility hydraulic equipment, it is difficult check predict faults. Common fault diagnosis maintenance methods for can be divided into two types: a signal analysis based on mathematical model machine learning algorit...

An important achievement is the invention and development of techniques for measurement of velocities in hydraulic engineering applications. Knowledge of the technological advances in digital cameras with high resolution and high speed are extremely useful to measure relevant predictive parameters in the environment. Here we present some advances in image processing techniques, these can be use...

The analysis of factors influencing the failures a mining excavator is substantiated. classification and methods dealing with them will have great importance in engineering. article considers an example influence various on lifting mechanism hydraulic excavator. Thanks to early identification most excavator, it be possible manage equipment maintenance repair under actual conditions operating co...

The automation and robotics for earth moving machines were introduced to reduce labor cost and increase machines performances , the increment of position accuracy of the excavator bucket obtained by laser and/or automatic control systems meets both objects. Experimental tests and simulations have shown excavating accuracy to be about two centimeters , the excavating accuracy depends on position...

INTRODUCTION The majority (67%) of hospitalized injuries among Alaska commercial fishermen are associated with deck machinery. This paper describes the "Prevention Through Design" process to mitigate one serious machinery entanglement hazard posed by a capstan deck winch. METHODS After observing that the capstan winch provides no entanglement protection and the hydraulic controls are usually ...

In this paper we describe a high-fidelity perfusion simulation system intended for use in the training and continuing education of perfusionists. The system comprises a hydraulic simulator, an electronic interface unit and a controlling computer with associated real-time computer models. It is designed for use within an actual operating theatre, or within a specialized simulation facility. The ...

The prediction of pressure and output power fluctuations amplitudes on Francis turbine prototype is a challenge for hydro-equipment industry since it is subjected to guarantees to ensure smooth and reliable operation of the hydro units. The European FP7 research project Hyperbole aims to setup a methodology to transpose the pressure fluctuations induced by the cavitation vortex rope from the re...

The effects of different application technologies were evaluated on the concentration, viability, and effi ciency of infective juveniles of the nematodes Heterorhabditis indica Poinar, Karunakar & David and Steinernema sp. (IBCB-n6) to control Spodoptera frugiperda Smith on corn plants. Two hundred and eighty infective juveniles of Steinernema sp. were required to kill 100% third-instar fall ar...

Based on FBG fiber Bragg grating technology and BOTDA distributed optical fiber sensing technology, this study used fine sand to simulate overburden layer in vertical shaft model equipment. The placing technique and test method for optical fiber sensors in the overburden layer were studied, combined with MODFLOW software to simulate the change of the water head value when the overburden layer w...