Jürgen Weber
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View article: Rapid Thermal Energy Modeling and Analysis of Complex Industrial Hydraulic Systems
Rapid Thermal Energy Modeling and Analysis of Complex Industrial Hydraulic Systems Open
Modeling and analyzing the thermal energy behavior of industrial hydraulic systems with useful hydraulic power of 20 kW or higher is a challenging task due to the system’s inherent complexity and the multitude of interacting components. Co…
View article: Investigation of the Heat Conduction in Axial Piston Pumps by Direct Measurement and Simulation
Investigation of the Heat Conduction in Axial Piston Pumps by Direct Measurement and Simulation Open
Axial piston pumps are key components in modern hydraulic systems, especially where high efficiency and robustness are essential. While numerical tools for simulating lubrication gaps and internal temperature distributions have advanced si…
View article: CFD prediction and experimental visualisation of cavitation and its erosion in hydraulic valves
CFD prediction and experimental visualisation of cavitation and its erosion in hydraulic valves Open
This article presents an experimentally validated computational fluid dynamics (CFD) model for localising and quantifying cavitation erosion in oil hydraulic valves using large eddy simulation (LES) turbulence modelling and the cavitation …
View article: Design of a Cartesian Hybrid Force-Position Controller for a Hydraulic Manipulator
Design of a Cartesian Hybrid Force-Position Controller for a Hydraulic Manipulator Open
In this paper, we formulate a design for a hybrid force-position controller (HFPC) for a hydraulically actuated excavator arm and perform simulative validation of the proposed approach. The concept of an HFPC by Raibert et al. [1] is adapt…
View article: Advancing Thermal Monitoring in Axial Piston Pumps: Simulation, Measurement, and Boundary Condition Analysis for Efficiency Enhancement
Advancing Thermal Monitoring in Axial Piston Pumps: Simulation, Measurement, and Boundary Condition Analysis for Efficiency Enhancement Open
To prepare today’s fluid power systems for the future digitalization of the industry, it is necessary to improve the information available regarding the current condition of crucial components of the system. Positive displacement machines,…
View article: Determination of the Flow Angle in Hydraulic Components
Determination of the Flow Angle in Hydraulic Components Open
The paper presents a general analytical equation for the determination of the flow angel in hydraulic components like valves and pumps. Exemplary, the method is applied to two different valve concepts – a cartridge valve and a rotary slide…
View article: Adaptive Meter-out Control of Pneumatic Drives by Using Novel Multi-stable Solenoids
Adaptive Meter-out Control of Pneumatic Drives by Using Novel Multi-stable Solenoids Open
Multi-stable solenoids are novel energy-efficient actuators, which combine the continuous adjustability of proportional solenoids with the energy efficiency of polarised magnetic circuits. They can hold any armature position without power …
View article: Cycle Time-Based Fault Detection and Localization in Pneumatic Drive Systems
Cycle Time-Based Fault Detection and Localization in Pneumatic Drive Systems Open
Compressed air ranks among the most expensive forms of energy. In recent decades, increased efforts have been made to enhance the overall energy efficiency of pneumatic actuator systems and develop reliable fault detection methods for prev…
View article: Predicting Hydraulic Oil Thermophysical Properties Using Physics-Informed Neural Networks
Predicting Hydraulic Oil Thermophysical Properties Using Physics-Informed Neural Networks Open
The thermophysical properties of hydraulic oil, density, viscosity, thermal expansion, and compressibility, are pivotal factors influencing the functioning of hydraulic systems. With the multitude of hydraulic oils available for use, condu…
View article: Energy Efficiency of Pneumatic Actuating Systems with Pressure-Based Air Supply Cut-Off
Energy Efficiency of Pneumatic Actuating Systems with Pressure-Based Air Supply Cut-Off Open
To exploit the energy-saving potential of pneumatic actuator systems, various energy-saving circuits have been developed in recent decades. However, the principle of a pressure-based air supply cut-off has only been considered to a limited…
View article: DEVELOPMENT AND TESTS OF A HYDRAULIC SWIVEL DRIVE WITHHYDROSTATIC BEARINGS
DEVELOPMENT AND TESTS OF A HYDRAULIC SWIVEL DRIVE WITHHYDROSTATIC BEARINGS Open
Hydraulic swivel drives from SÜDHYDRAULIK by Homrich Maschinenbau GmbH are widely used for different applications.Especially for oscillating movements with high frequencies and for integration of functions as thrust bearings, the axial loa…
View article: COMPARISON OF STRATEGIES FOR UNNOTICEABLE MODE SHIFTING IN MOBILE INDEPENDENT METERING SYSTEMS
COMPARISON OF STRATEGIES FOR UNNOTICEABLE MODE SHIFTING IN MOBILE INDEPENDENT METERING SYSTEMS Open
Independent Metering (IM) offers great potential to improve the energy efficiency of hydraulic systems.This is especially important in mobile applications due to the limited capacities of electric accumulators, which will probably become t…
View article: AUTOMATION OF PNEUMATIC THROTTLE CHECK VALVES BY USING NOVEL MULTI-STABLE SOLENOIDS
AUTOMATION OF PNEUMATIC THROTTLE CHECK VALVES BY USING NOVEL MULTI-STABLE SOLENOIDS Open
Multi-stable solenoids are novel energy-efficient actuator structures, which can hold any armature position powerless.Power is only required to change the armature position.They combine the continuous adjustability of proportional solenoid…
View article: THERMAL ANALYSIS OF THE CYLINDER BLOCK OF AN AXIAL PISTON PUMP - THE KEY TO MONITORING EFFICIENCY
THERMAL ANALYSIS OF THE CYLINDER BLOCK OF AN AXIAL PISTON PUMP - THE KEY TO MONITORING EFFICIENCY Open
To prepare today's fluid power systems for the future digitalization of the industry, it is necessary to improve the information available regarding the current condition of crucial components of the system.Positive displacement machines, …
View article: Characteristic and oscillation tendency study for different seat geometries of the pilot stage of a two-staged pressure control valve
Characteristic and oscillation tendency study for different seat geometries of the pilot stage of a two-staged pressure control valve Open
Two-staged pressure control valves are used in various applications.The usage in semi-active shock absorbers leads to several advantages compared to orifice controlled proportional valves.However, the high dynamic operation and limited ass…
View article: FAULT LOCALIZATION FOR INDEPENDENT METERING SYSTEMS BY MODEL-BASED FAULT DETECTION
FAULT LOCALIZATION FOR INDEPENDENT METERING SYSTEMS BY MODEL-BASED FAULT DETECTION Open
This paper deals with fault localization for a mobile hydraulic system with independent metering, but it is also applicable to other hydraulic systems.The basis for this contribution is a model-based fault detection, which generates multip…
View article: DEDICATED DESIGN OF THE FREE JETS FOR ROTARY SLIDE VALVES
DEDICATED DESIGN OF THE FREE JETS FOR ROTARY SLIDE VALVES Open
The paper presents a general analytical method for the determination of the flow angel in hydraulic components like valves and pumps.In this paper it will be illustrated by a rotary slide valve.The design of the flow geometry e.g. in valve…
View article: DIGITAL ASSISTED COLLISION AVOIDANCE FOR MOBILE MACHINERY
DIGITAL ASSISTED COLLISION AVOIDANCE FOR MOBILE MACHINERY Open
Despite high safety standards and numerous preventive measures, both employees and objects on the construction site are exposed to a high risk of accidents.These scenarios are often caused in the handling of construction machinery, such as…
View article: TRIBOLOGICAL PROPERTIES OF DIFFERENT SLIPPER DESIGNS OF AN AXIAL PISTON PUMP
TRIBOLOGICAL PROPERTIES OF DIFFERENT SLIPPER DESIGNS OF AN AXIAL PISTON PUMP Open
New application areas such as compact drives and displacement control using variable electric motors require that hydrostatic machines exhibit good performance also at very low relative speeds without being damaged during critical mixed fr…
View article: Application and evaluation of classic and demand oriented cooling strategies in context of machine tools
Application and evaluation of classic and demand oriented cooling strategies in context of machine tools Open
Energy consumption is an important factor in the operation of machine tools. Recent studies showed that in average, $${1}/{5}$$ of the machine tools total energy demand is caused by internal cooling systems. The continually rising per…
View article: Application and evaluation of classic and demand oriented cooling strategies in context of machine tools
Application and evaluation of classic and demand oriented cooling strategies in context of machine tools Open
Energy consumption is an important factor in the operation of machine tools Recent studies showed that in average 1/5 of the machine tools total energy demand is caused by internal cooling systems. The continually rising performance of mac…
View article: Energy Efficiency Analysis and Experimental Test of a Closed-Circuit Pneumatic System
Energy Efficiency Analysis and Experimental Test of a Closed-Circuit Pneumatic System Open
In a closed-circuit pneumatic system the air from the pneumatic cylinder is not exhausted directly in the atmosphere, as done in traditional open-circuit systems, but is captured and fed to the compressor inlet. This provides an opportunit…
View article: Experiments and Computational Fluid Dynamics on Vapor and Gas Cavitation for Oil Hydraulics
Experiments and Computational Fluid Dynamics on Vapor and Gas Cavitation for Oil Hydraulics Open
A compressible Euler‐Euler computational fluid dynamics (CFD) model for vapor, gas, and pseudo‐cavitation in oil‐hydraulic flows is presented. For vapor, the Zwart‐Gerber‐Belamri (ZGB) model is used and for gas cavitation, the Lifante mode…
View article: Holistic Analysis of the Tribological Interfaces of an Axial Piston Pump – Focusing on the Pump Efficiency
Holistic Analysis of the Tribological Interfaces of an Axial Piston Pump – Focusing on the Pump Efficiency Open
Research work performed on an axial piston pump is shown in a holistic manner, analyzing each lubricating interface by linking their gap height and temperature behavior to the overall pump efficiency. The temperature field and dynamic flui…
View article: The Role of Management Controls in New Product Development: Codifying a Collective Source of Creativity
The Role of Management Controls in New Product Development: Codifying a Collective Source of Creativity Open
This paper contributes to the understanding of the role of Management Controls (MCs) in mediating and stimulating creative processes. Adopting a knowledge codification perspective, it demonstrates how actors create multiple MCs that open d…
View article: Adaptive Identification and Application of Flow Mapping and Inverse Flow Mapping for Electrohydraulic Valves
Adaptive Identification and Application of Flow Mapping and Inverse Flow Mapping for Electrohydraulic Valves Open
Good estimation of flow mapping (FM) and inverse flow mapping (IFM) for electrohydraulic valves are important in automation of fluid power system. The purpose of this paper is to propose adaptive identification methods based on LSM, BPNN, …