scholarly journals Ways to ensure the efficiency and improvement the efficiency of hydraulic machines

2021 ◽  
Vol 2094 (4) ◽  
pp. 042090
Author(s):  
A S Lunev ◽  
A S Kaverzina ◽  
I V Karnaukhov ◽  
M D Pankiv ◽  
I V Andreychikov
Keyword(s):  
Hydraulic Drive ◽  
Energy Losses ◽  
Minimal Energy ◽  
Hydraulic Systems ◽  
Environmental Friendliness ◽  
Hydraulic Machines

Abstract In this paper, the methods of designing hydraulic drives with minimal energy losses are considered. As well as ways to reduce energy losses in hydraulic systems. The importance of the work is due to the fact that methods have been proposed to improve the reliability and environmental friendliness of the hydraulic drive.

scholarly journals Multi-Point-of-View Energy Loss Analysis in a Refuse Truck Hydraulic System

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2707
Author(s):  
Luis Javier Berne ◽  
Gustavo Raush ◽  
Pedro Javier Gamez-Montero ◽  
Pedro Roquet ◽  
Esteban Codina
Keyword(s):  
Energy Efficiency ◽  
Hydraulic System ◽  
Energy Demand ◽  
Combustion Engine ◽  
Point Of View ◽  
Energy Losses ◽  
Hydraulic Systems ◽  
Hydraulic Machines ◽  
Points Of View ◽  
The Individual

In recent years, much research has focused on reducing the power consumption of mobile hydraulic machines due to rising fuel costs, regulations on combustion engine emissions and the need to reduce the size and weight of the storage devices in hybrid drives. Current approaches to improve the energy efficiency of a hydraulic system can be classified into four basic groups: reduction of the energy demand, recovery of part of the supplied energy (ERS systems), regeneration of part of the supplied energy and reuse of the recovered and regenerated energy (hybrid systems). Today’s mobile hydraulic systems are often complex, perform different tasks and work under different load conditions, which makes it difficult to analyse energy losses. A study of the energy losses of a hydraulic system from different points of view, such as an energy balance for a complete machine cycle, an analysis of the individual cycle phases and a power analysis for the different operation quadrants of the actuators, can give an global picture of the energy losses, being very useful to rate its energy efficiency, identify main power losses and decide which of the different energy-saving techniques to apply. This paper describes the data collection process, its analysis from various points of view and the summary of the results in easy to understand charts as useful tools to identify and quantify the main energy losses. Only system architecture losses are considered. Losses in the ICE engine or the electric motor, hydraulic pump losses and mechanical losses are outside the scope of this study.

scholarly journals Psychoacoustic Evaluation of Hydraulic Pumps

2021 ◽  
Vol 13 (13) ◽  
pp. 7320
Author(s):  
Tobias Pietrzyk ◽  
Markus Georgi ◽  
Sabine Schlittmeier ◽  
Katharina Schmitz
Keyword(s):  
Sound Pressure ◽  
Paired Comparison ◽  
Hydraulic Drive ◽  
Operating Parameter ◽  
Gear Pump ◽  
Hydraulic Systems ◽  
Hydraulic Pump ◽  
Listening Tests ◽  
Internal Gear ◽  
Axial Piston

In this study, sound measurements of an axial piston pump and an internal gear pump were performed and subjective pleasantness judgements were collected in listening tests (to analyze the subjective pleasantness), which could be seen as the inverse of the subjective annoyance of hydraulic drives. Pumps are the dominant sound source in hydraulic systems. The noise generation of displacement machines is subject of current research. However, in this research only the sound pressure level (SPL) was considered. Psychoacoustic metrics give new possibilities to analyze the sound of hydraulic drive technology and to improve the sound quality. For this purpose, instrumental measurements of the acoustic and psychoacoustic parameters are evaluated for both pump types. The recorded sounds are played back to the participants in listening tests. Participants evaluate them regarding the subjective pleasantness by means of paired comparison, which is an indirect scaling method. The dependence of the subjective pleasantness on speed and pressure was analyzed for both pump types. Different regression analyses were carried out to predict the subjectively perceived pleasantness or annoyance of the pumps. Results show that a lower speed is the decisive operating parameter for reducing both the SPL and the annoyance of a hydraulic pump.

STUDY OF THE DYNAMICS OF PULSE HYDRAULIC MECHANISMS WITH PNEUMATIC STROKE CHAMBER

2021 ◽  
Vol 2 ◽  
pp. 159-165
Author(s):  
A.V. GORIN ◽  
R.N. POLYAKOV ◽  
M.A. GRYADUNOVA ◽  
I.V. RODICHEVA
Keyword(s):  
Physical Model ◽  
Relative Energy ◽  
The State ◽  
Energy Losses ◽  
Paper Briefly ◽  
Cross Sectional ◽  
Working Chamber ◽  
Hydraulic Machines ◽  
Pneumatic Chamber ◽  
Hydraulic Mechanism

The paper briefly outlines the state of development of impulse technology. The schemes of hydraulic machines of impulse action with percussion mechanisms of the sixth and seventh classes are presented. The calculation of impulse mechanisms with a pneumatic chamber of the working stroke is given. The physical model of the drain pipeline is presented. Shown is a diagram of the forces acting on the striker during the working stroke. The dependence of the relative energy losses on the ratios of the cross-sectional areas of the working chamber and the drain pipeline is presented. Recommendations are given for the use of a pneumatic accumulator in the drain branch of the pipeline of a pulsed hydraulic mechanism with a pneumatic chamber of the working stroke

scholarly journals The method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning executive elements

2018 ◽  
Vol 226 ◽  
pp. 04024
Author(s):  
Valeriy V. Grechikhin ◽  
Galina A. Galka ◽  
Anatoliy I. Ozerskiy ◽  
Mikhail E. Shoshiashvili
Keyword(s):  
Mutual Influence ◽  
Hydraulic Drive ◽  
Joint Work ◽  
Operating Modes ◽  
Hydraulic Machines ◽  
Dynamic Operating ◽  
Electrohydraulic Drive ◽  
Drive Systems ◽  
Improved Accuracy ◽  
Executive Elements

The article describes the method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning output element. The method is the evolution of the fundamental positions of the mechanics of continuous media with moving boundaries as applied to the research of non-stationary processes accompanying the operation of hydraulic drive systems with piston hydraulic machines. The method is based on generalized modeling (technical, physical, mathematical and computer), takes into account the peculiarities of mutual influence of electric and hydraulic machines during their joint work as part of the electrohydraulic drive, which raises the level and adequacy of actuators simulation, as well as the reliability of the assessment of their technical condition. The method extends the field of research, improves the accuracy of the calculation of the positioning of the executive elements, taking into account the different dynamic modes of the drives under study.

scholarly journals Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders

2019 ◽  
Vol 19 (3) ◽  
pp. 242-249 ◽  
Author(s):  
A. T. Rybak ◽  
I. K. Tsybriy ◽  
S. V. Nosachev ◽  
A. R. Zenin
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test Bench ◽  
Hydraulic Drive ◽  
Mechanical Transmission ◽  
Hydraulic Motor ◽  
Hydraulic Machines ◽  
Life Tests ◽  
Hydraulic Cylinders

Introduction. The durability and performance of hydraulic machines is determined through life tests. At that, various braking devices (mechanical, electric, hydraulic, etc.) are used for strength loading of the hydraulic motor, as a result of which a significant amount of energy is lost. This can be avoided if the method of rotational motion with energy recovery is used during life tests. This approach is applicable for hydraulic pumps, motors, and hydraulic cylinders.Materials and Methods. A test bench is presented, the design of which provides recreation of the conditions most appropriate for the field operation of hydraulic cylinders. In this case, energy recovery is possible. To solve the research problems, methods of mathematical modeling were used, the basic functional parameters of the proposed design were calculated. The determination of the pressure increment at various points in the hydraulic system is based on the theory of volumetric rigidity. When modeling the motion of the moving elements of the bench hydraulic system, the laws of rotor motion are used.Research Results. In the structure of the test bench, the cylinders in question are located in the pressure main between the hydraulic pump and the hydraulic motor. This enables to significantly reduce the bench itself and to save a significant amount of energy due to its recovery. A basic hydraulic diagram of the test bench for piston hydraulic cylinders is presented, in which the operation of the moving elements of the system is shown. A mathematical modeling of the hydraulic system of the bench is performed. A kinematic diagram of the mechanism for transmitting motion between test cylinders is shown.Discussion and Conclusions. The system of equations presented in the paper shows how the increment of pressure at the selected nodal points of the energy recovery system is determined (in particular, how the increment depends on time, reduced coefficient of volumetric rigidity, operating fluid consumption, and piston areas). The velocities of the hydraulic pistons are determined according to the kinematic scheme of the mechanical transmission of the bench. Thus it can be argued that, thanks to the solution presented in the paper, the life test results of hydraulic cylinders will adequately reflect their operation under rated duties.

Hydraulics

2020 ◽  
Author(s):  
Sergey Vol'vak
Keyword(s):  
Graduate Students ◽  
Water Supply ◽  
Hydraulic Drive ◽  
Study Guide ◽  
Agricultural Water ◽  
Field Of Study ◽  
Hydraulic Machines ◽  
Agricultural Water Supply

Study guide corresponds to the program discipline "Hydraulics" and consists of two parts: "Hydraulics and hydraulic machines" and "the Dredging of agricultural processes". This course focuses on the theory of hydraulics, design and operation of hydraulic machines, fans, compressors and other means of dredging of agricultural processes, provides information about the hydraulic drive, the basics of reclamation and mechanized irrigation and agricultural water supply, data on hydropneumatische in agriculture. For students of all forms of education in field of study 35.03.06 "Agroengineering", as well as for graduate students, teachers and technical workers of agriculture.

Modeling, analysis, and co-simulation of cable parallel manipulators for multiple cranes

2014 ◽  
Vol 229 (9) ◽  
pp. 1693-1707 ◽  
Author(s):  
Bin Zi ◽  
Long Zhang ◽  
Dan Zhang ◽  
Sen Qian
Keyword(s):  
Hydraulic Drive ◽  
Parallel Manipulators ◽  
Hydraulic Systems ◽  
Reachable Workspace ◽  
Output Torque ◽  
Modeling Analysis ◽  
Collaborative Working ◽  
Building Components ◽  
Large Motion ◽  
Large Output

With the increase of the weight and volume of building components, the collaborative working of multiple cranes is necessary when one crane cannot meet the lifting requirement sometimes. This paper is devoted to model and analyze a type of cable parallel manipulators for multiple cranes (CPMMCs). The CPMMCs have better lifting capability than a single crane and can be applied in complex lifting tasks. Kinematics and dynamics of the end-effector of the CPMMCs are studied and the reachable workspace is carried out additionally. Considering the requirements of large output torque, large motion scope etc. the hydraulic drive mode is adopted. The bond graph method is applied for the analysis of hydraulic systems. Subsequently, the AMESim models for the hydraulic systems are constructed. The performance of the CPMMCs and the accuracy of the models are verified by co-simulation under working conditions.

Soft Switching in Switched Inertance Hydraulic Circuits

2016 ◽  
Author(s):  
Alexander C. Yudell ◽  
James D. Van de Ven
Keyword(s):  
High Speed ◽  
Soft Switching ◽  
Power Delivery ◽  
Lumped Parameter Model ◽  
Energy Losses ◽  
Hydraulic Systems ◽  
Zero Voltage Switching ◽  
Lumped Parameter ◽  
Capacitive Element ◽  
Zero Voltage

Switched Inertance Hydraulic Systems (SIHS) use inductive, capacitive, and switching elements to boost or buck a pressure from a source to a load in an ideally lossless manner. Real SIHS circuits suffer a variety of energy losses, with throttling of flow during transitions of the high-speed valve resulting in 44% of overall losses. These throttling energy losses can be mitigated by applying the analog of zero-voltage-switching, a soft switching strategy, adopted from power electronics. In the soft switching circuit, the flow that would otherwise be throttled across the transitioning valve is stored in a capacitive element and bypassed through check valves in parallel with the switching valves. To evaluate the effectiveness of soft switching in a boost converter SIHS, a lumped parameter model was constructed. The model demonstrates that soft switching can improve the efficiency of the circuit up to 42% and extend the power delivery capabilities of the circuit by 76%.

Protection of Hydraulic Systems against Dynamic Loads Using Multi-Valve Approach

2014 ◽  
Vol 1036 ◽  
pp. 547-552 ◽  
Author(s):  
Aleksander Gwiazda ◽  
Agnieszka Sękala ◽  
Wacław Banaś ◽  
Zbigniew Monica
Keyword(s):  
Design Process ◽  
Hydraulic System ◽  
Integrated Approach ◽  
Dynamic Loads ◽  
Design Solution ◽  
Technical Solution ◽  
Hydraulic Systems ◽  
Modeling Tools ◽  
Hydraulic Machines ◽  
Independent Design

The paper presents the method of designing equipment for protection the hydraulic system, and particularly hydraulic machines, against dynamic loads. The example of such machine is a powered mining support. A support must work in the conditions related with rock crumps what causes large and quick energy releasing. The designing process bases on the integrated approach what let taking into consideration all needed elements of this process [1,. Each of the elements of the design process could be an independent design agent which could find its solution both in CAD technique and other modeling tools [3,4]. Moreover in the paper is presented the results of computer analysis of the presented solution. This design solution bases on the application, in the protected hydraulic system, two complementary valves: the quick-release valve and the large-caliber one. Analysis of this valve system allow to state that this technical solution should protect a hydraulic system against dynamic loads of any energy.

scholarly journals Stochastic models for ensuring parametric reliability of the construction machines

2021 ◽  
pp. 262-273
Author(s):  
Galyna Getun ◽  
Vitalii Les'ko ◽  
Iryna Bezklubenko ◽  
Olena Balina ◽  
Yurii Butsenko
Keyword(s):  
Methodological Approach ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Technical Condition ◽  
Technical Problems ◽  
Reliability Models ◽  
Reliability Indicators ◽  
Hydraulic Machines ◽  
Parametric Reliability ◽  
Analysis Of Failures

The solution of technical problems to ensure the working capacity is largely determined by the effectiveness of theoretical and applied developments in an area of estimation and prediction of their reliability indicators. An effective approach to the analysis of failures and the development of operability and parametric reliability models provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydro drive elements of construction machines, their relationships and features of the formation of parameters failures. And this will allow to get more real and accurate results of estimation of reliability indicators of hydraulic drives of both construction and other hydraulic machines. They do not exhaust all possible variants of models that can take place when analyzing the reliability of hydraulic drives of machines, but at the same time they to a certain extent extend and refine the set of known reliability models. Specific in terms of formation of parametrical failures are such consistently connected in terms of the layout of hydraulic elements, as working sections of hydraulic distributors and hydraulic cylinders, which are part of the subsystems of GPs and form the so-called functional areas (FA). Reaching the FA limit is a compatible result of the combined random process of evolution of the volumetric efficiency JCUA  these elements, and the technical condition of the FA is estimated to be generalized by the JCUA, which equals the product of the JCUA of consecutively connected elements: . In this case, the probability of maintaining the capacity of the FA will be: . The processing of diagnostic information and the study of the reliability of GPs in real conditions of their operation showed that the distribution of JCUD hydraulic elements with a sufficient degree of consistency can be described under several theoretical laws. It is considered when the JCUA sections of the hydraulic distributor and hydraulic cylinder are distributed by gamma distribution and exponential distribution. The use of the general methodological approach to the analysis of failures and the construction of models of operability and parametric reliability provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydraulic drive elements, They don't exhaust all possible models that can take place when analyzing the reliability of hydraulic drives, but at the same time they are to some extent expanding and refining the range of already known models of reliability.

Sign in / Sign up

Export Citation Format

Share Document