Computer simulation is a powerful and generally accepted practice to carry out research in the area of fluid power. This is especially true with heavy machinery. Production series are relatively small and unit prices are high. Due to this prototypes are rarely available for machine designers and researchers. There are also a lot of variables to be measured. This means that field measurements ar...

Abstract In mobile machinery, hydro-mechanical pumps are increasingly replaced by electronically controlled to improve the automation level, but diversified control functions (e.g., power limitation and pressure cut-off) integrated into electronic controller only from pump leading potential instability of overall system. To solve this problem, a multi-mode electrohydraulic load sensing (MELS) s...

sures experienced by a pipeline can be either beneficial or detrimental from an operational performance perspective, depending on the amount, the two phase regime of the mixture (whether homogeneous or slug) and the nature and cause of the transient. It is generally held that when free (undissolved) air, or gas, is present in a hydraulic system, it can greatly reduce the surge pressure levels b...

Construction machinery, especially hydraulic excavators, plays an important role in building and other industries. However, they often consume a lot of energy emit large amounts harmful emissions into the environment. This study focuses on regeneration technologies which can help reduce consumption pollution excavators. First, potential recoverable sources excavator mechanisms are analyzed. Nex...

At low flow rate operation, Francis turbines feature a cavitating vortex rope in the draft tube resulting from the swirling flow of the runner outlet. The unsteady pressure field related to the precession of the vortex rope induces plane wave propagating in the entire hydraulic system. The frequency of the vortex rope precession being comprised between 0.2 and 0.4 times the turbine rotational s...

Problem. The article considers the issue of increasing efficiency operation construction machines by improving systems measures that provide an effective system for diagnosing hydraulic drive elements. considered existing methods prove a more determination indicators diagnostic parameters in with error devices themselves drives and road will be equipment gives necessary result lower overall cos...

Rotating machinery is the most common machinery in industry. The root of the faults in rotating machinery is often faulty rolling element bearings. This paper presents a technique using optimized artificial neural network by the Bees Algorithm for automated diagnosis of localized faults in rolling element bearings. The inputs of this technique are a number of features (maximum likelihood estima...