scholarly journals A new process to develop a hydraulic system adapted to biodegradable hydraulic oil for construction machinery

2021 ◽  
Vol 12 (2) ◽  
pp. 56-74
Author(s):  
Satoshi OHKAWA ◽  
Sunkil YUN ◽  
Taketoshi HIBIYA ◽  
Hidekazu NISHIMURA
Keyword(s):  
Hydraulic System ◽  
Construction Machinery ◽  
Hydraulic Oil ◽  
New Process

scholarly journals A new process to develop a hydraulic system adapted to biodegradable hydraulic oil for construction machinery

Synthesiology ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 57-74
Author(s):  
Satoshi OHKAWA ◽  
Sunkil YUN ◽  
Taketoshi HIBIYA ◽  
Hidekazu NISHIMURA
Keyword(s):  
Hydraulic System ◽  
Construction Machinery ◽  
Hydraulic Oil ◽  
New Process

The Retrospects and Prospects of Pure Water Hydraulic Technology

2012 ◽  
Vol 201-202 ◽  
pp. 979-982 ◽  
Author(s):  
Feng Xu ◽  
Li Xiang Zhang
Keyword(s):  
Hydraulic System ◽  
Low Cost ◽  
Pure Water ◽  
Chemical Properties ◽  
Simple System ◽  
Hydraulic Oil ◽  
Physico Chemical ◽  
Water Hydraulic ◽  
Research Situation ◽  
The Ideal

Pure water hydraulic technology attracts more and more attention of people due to no pollution, low cost, simple system, and many other advantages. This paper compares physico-chemical properties between pure water and hydraulic oil, concludes that pure water is the ideal medium for hydraulic system. Then it discusses the development of pure water hydraulic technology, introduces the present research situation and development of pure water hydraulic components from home to abroad in the future.

An Adding Mass Method for Stiffly Mechanical System Simulation and Applications to Construction Machinery

2001 ◽  
Author(s):  
Etsujiro Imanishi ◽  
Satoshi Yonezawa ◽  
Naoki Sugano ◽  
Eiko Hirooka ◽  
Takahiro Kobayashi
Keyword(s):  
Mechanical System ◽  
Dynamic Simulation ◽  
Hydraulic System ◽  
Piecewise Linear ◽  
Hydraulic Systems ◽  
Practical Application ◽  
Construction Machinery ◽  
Linear Elements ◽  
Improvement Method ◽  
And Control

Abstract A characteristic improvement method for dynamic simulation of a stiff mechanical system by adding mass is presented. Hydraulic systems with check valves and control valves on construction machinery exhibit piecewise-linear characteristics for hydraulic flow rate and spool stroke. The proposed improvement method involves no time delay in determining the mass by considering both eigenvalue distortion of the system and time response. This paper shows a practical application to the boom derricking system of a rough terrain crane, and demonstrates that this method is useful for dynamic simulation of hydraulic system including stiff piecewise-linear elements.

New Process for Regeneration of Main Control Valve

2014 ◽  
Vol 635-637 ◽  
pp. 181-184
Author(s):  
Li Ming Cai
Keyword(s):  
Service Life ◽  
Hydraulic System ◽  
Control Valve ◽  
Maintenance Cost ◽  
Simple Process ◽  
New Process ◽  
Regenerative Repair

Main control valve is the key component of the hydraulic system, the valve value accounts for about 30% of machinery hydraulic system. The regenerative repair of main control valve was completed by adopting grinding, electroplating and other relatively simple process. So, process is easy to operation and implementation, the maintenance cost and waste of resources is decreased, and repair effect is good. The service life of main control valve regenerated by using this technology can reach or exceed the service life of new one.

Cavitation Erosion in the Portion of an Oil Passage Through Which Bubbles Pass

2017 ◽  
Author(s):  
Kento Kumagai ◽  
Toshiharu Kazama
Keyword(s):  
Hydraulic System ◽  
Cavitation Erosion ◽  
Dynamics Simulation ◽  
Hydraulic Systems ◽  
Computational Fluid Dynamics Simulation ◽  
Construction Machinery ◽  
Cavitation Bubbles ◽  
Experimental Apparatus ◽  
Research Findings ◽  
Pass Through

Cavitation erosion is a serious problem in the hydraulic system of construction machinery. In particular, the erosion which occurs even when cavitation bubbles only pass through oil passages, occurs at a connecting portion between the hydraulic components and piping, and the erosion causes oil leakage, which is a serious problem for hydraulic systems. However, it is difficult to predict the eroded area and to prevent the erosion because of a lack of research findings. The present study investigated erosion in the portion through which cavitation bubbles passes using a basic experimental apparatus that simulates an oil passage of hydraulic components, and by conducting a computational fluid dynamics simulation. The following results were obtained. Erosion occurs near the outlet of the oil passage, cavitation bubbles frequently disappear rapidly near the area of erosion, and the cause of bubble disappearance is the pressure distribution and amplification of the pressure wave of cavitation jets at the outlet of the oil passage. These results help explain the erosion generation mechanism and the characteristics of erosion in oil passages of hydraulic components, and can be used to design methods of reducing erosion.

Analysis of Construction Machinery Hydraulic Control System

2013 ◽  
Vol 401-403 ◽  
pp. 1590-1595 ◽  
Author(s):  
Li Zhang
Keyword(s):  
Power Control ◽  
Hydraulic System ◽  
Control Mode ◽  
Hydraulic Control ◽  
Hydraulic Power ◽  
Construction Machinery ◽  
Advantages And Disadvantages ◽  
Power And Control ◽  
And Control ◽  
Hydraulic Control System

This article analyses the use requirement of construction machinery, introduce the main features of typical construction machinery hydraulic system, derived power control modes of hydraulic system form hydraulic power form, compares the advantages and disadvantages of each power control mode, gives the optimization solutions, at last, sum up the full text of the construction machinery hydraulic power and control modes and prospect of the hydraulic system to precision control.

Research on Rapid Detection and Accounting of Small Particles in Marine Hydraulic Oil

2015 ◽  
Vol 645-646 ◽  
pp. 687-692
Author(s):  
Lin Zeng ◽  
Hong Peng Zhang ◽  
En Chen Liu ◽  
Hai Quan Chen ◽  
Fang Yu Cui
Keyword(s):  
Signal Amplification ◽  
Rapid Detection ◽  
Hydraulic System ◽  
Detection System ◽  
Iron Particles ◽  
Small Particles ◽  
Hydraulic Oil ◽  
Java Programming ◽  
Optical Detection System ◽  
Number Of Particles

Hydraulic system is widely used in the ship, when the diameter of tiny particles in hydraulic oil exceeds 20μm it indicates that the abnormal wear occurred and the malfunction may cause. This paper uses the light blockage method, the microfluidic detection chip for hydraulic oil detection has been designed and fabricated, a simple and effective optical detection system is developed with the signal amplification and data collection to achieve the detection of tiny particles, and finally through the JAVA programming to count the number of particles in which the diameter is more than 20μm. The results of rapid detections on iron particles with diameter between 25μm and 38μm show the good performance of the detection system and prove that the method is feasible.

The Application of Oil Monitoring Technology in the Marine Hydraulic System

2014 ◽  
Vol 628 ◽  
pp. 287-292 ◽  
Author(s):  
Bin Sun ◽  
Xin Cong Zhou
Keyword(s):  
Basic Principle ◽  
Hydraulic System ◽  
Oil Pollution ◽  
Monitoring Technology ◽  
Hydraulic Oil ◽  
Oil Monitoring

This paper discusses the source and harm of the hydraulic oil pollution, the connotation of oil monitoring technology, methods, instruments and basic principle of the oil monitoring, and states the feasibility and importance of oil monitoring technology from two failure cases in the hydraulic system of the ship.

Influence of outflow of oil on work of hydro machines

2020 ◽  
pp. 11-17
Author(s):  
A. I. Petrashev ◽  
V. V. Klepikov
Keyword(s):  
Hydraulic System ◽  
Hydraulic Oil

Influence of outflow of oil on its heating and decrease of useful capacity of the pump in hydraulic system of a tractor at work with the hydro motor is shown. The system of stabilization of temperature of hydraulic oil is necessary for steady work of the hydro motor.

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