Simulation Experiment of Roll Bending Machine in Valveless Servo System

2012 ◽  
Vol 619 ◽  
pp. 410-414 ◽  
Author(s):  
Yang Cao ◽  
Xiao Yan Tian ◽  
Guo Qing Wu ◽  
Qiao Mei Li ◽  
Yan Hua Wu
Keyword(s):  
Hydraulic System ◽  
High Efficiency ◽  
Simulation Experiment ◽  
Control Strategies ◽  
New Technology ◽  
Servo System ◽  
Research Direction ◽  
Hydraulic Control ◽  
Main Research ◽  
Roll Bending

Valveless servo system is a new technology which is widely used in recent years. Compared to the traditional hydraulic system, valveless servo system has a lot of advantages such as high efficiency, less pollution and saving energy, which will be the main research direction of the hydraulic control in the future. Roll bending machine is a large industrial machine, but the efficiency of existing hydraulic system of roll bending machine is low and the cost of maintenance management is high. Applying valveless system on roll bending machine can overcome these defects. This paper made a study of the control strategies which were about valveless servo system on roll bending machine. And software MATLAB was used to do simulation experiment on valveless servo system. This paper summarized the steady-state error and dynamic characteristics according to output signals in different input signals.

Selection of Operating Modes of a Multi-Functional Hydraulic Device

2005 ◽  
Author(s):  
Amir Shenouda ◽  
Wayne J. Book
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Hydraulic System ◽  
Force Feedback ◽  
New Technology ◽  
Hydraulic Cylinder ◽  
Hydraulic Control ◽  
Operating Modes ◽  
Machine Productivity ◽  
Spool Valve

The field of earth moving equipment is experiencing a transformation due to the introduction of more electronic control capability and advanced control concepts. Conventional hydraulic control systems are controlled by proportional directional spool valve. The construction of the spool valve is such that a given position of the spool determines the flow in and the flow out restriction sizes. Thus, metering in and metering out are dependent or coupled. A certain restriction size on the inlet corresponds to a certain restriction size on the outlet. Therefore, we have one degree of freedom. It can provide for good motion control but it cannot achieve energy saving potential at the same time. In this paper, the concept of ‘independent meter in / meter out’ will be emphasized. Decoupling of meter in from meter out provides for more controllability and potential for energy saving in overrunning load cases when compared with a conventional spool valve controlled hydraulic system. A four-valve configuration controlling a hydraulic cylinder will be stressed. The four-valve configuration can operate in several modes because each of the four valves is controlled separately from the others. Five of these metering modes will be pointed out; two conventional modes and three regenerative modes. An industry system supplier has introduced a novel distributed independent metering in/meter out hydraulic system with actuator force feedback. This control system is going to presented in brief. The distributed, actuator mounted implementation of this system maximizes the efficiency of the regeneration flow by minimizing the line losses associated with the recirculating fluid This control system can be used to control a multi-functional hydraulic device, e.g. excavators, tractor loader backhoes, etc... An experiment was done where a typical dig cycle was performed by a tractor loader backhoe equipped with this new technology. The data recorded from this experiment is used to perform an off-line optimization of metering modes selection for each function during the cycle. this off-line optimization can be used to maximize machine productivity or machine efficiency or a weighted combination of both. A general objective function will be presented and results will be given for maximizing machine productivity. Finally conclusions and future work suggestions are presented.

Modeling and Simulation of a Novel Hydraulic Disc Brake for Truck-Mounted Drilling Rig

2011 ◽  
Vol 128-129 ◽  
pp. 1177-1181
Author(s):  
Xiu De Wu ◽  
Wei Liu
Keyword(s):  
Modeling And Simulation ◽  
Hydraulic System ◽  
Control Strategies ◽  
Influential Factors ◽  
Disc Brake ◽  
Hydraulic Control ◽  
Engineering Systems ◽  
Drilling Rig ◽  
Braking System ◽  
Hoisting System

Hydraulic disc brake is essential for meeting the requirements of safety and economic efficiency during drilling and work-over procedure. To address this need, we have developed a programmable logic controller controlled novel hydraulic disc brake system with capability to apply control strategy similar to anti-lock braking system for hoisting system of truck-mounted drilling rig. This paper is to investigate the complicated interaction between the work clamp and the hydraulic control system. So designers can use this model to decide which control strategies are more suitable for the disc brake. This is demonstrated by modeling the advanced hydraulic system and simulating influential factors on dynamic characteristics of hoisting system disc brake, with the application of the Advanced Modeling Environment for Simulations of Engineering Systems. The method of modeling and simulation provides a simple, effective approach to studying hydraulic disc brake for hoisting system.

Study of a Concrete Mixer Hybrid Truck

2013 ◽  
Author(s):  
Ferdinando Luigi Mapelli ◽  
Davide Tarsitano ◽  
Davide Annese ◽  
Nicola Pirri ◽  
Emanuele Zorzi
Keyword(s):  
Hydraulic System ◽  
Fossil Fuels ◽  
High Efficiency ◽  
Control Strategies ◽  
Simulation Models ◽  
Operating Conditions ◽  
Hybrid Powertrain ◽  
Conventional Concrete ◽  
Electrical Drives ◽  
Concrete Mixer

Decrease of availability of fossil fuels and environment issues, push research towards the development of high efficiency power trains for vehicles that transport people, goods and mobile operating machines, like the concrete mixer trucks considered in this paper. Conventional concrete mixer trucks use diesel engine to move the truck and a hydraulic system which keep spinning the concrete drum. A hybrid powertrain based on battery-powered electrical drives can replace the conventional hydraulic system assuring an efficiency improvement. Furthermore, thanks to the reversibility of the electrical drives, it is possible to recover kinetic energy during the braking phases of the truck. Aim of this paper is to study and develop a hybrid powertrain for the concrete mixer drum. The study is based on a full energetic model of the vehicle developed for sizing the components and designing the control strategies. A model of the conventional hydraulic mixer truck has also been proposed in order to evaluate the benefit introduced by the proposed hybrid system. Simulation models have been validated comparing experimental data collected on a conventional mixer truck in different operating conditions.

Research on the Factors of Introducing Chloride Ion of Hydraulic Support Transmission Medium and the Controlling Ways

2011 ◽  
Vol 356-360 ◽  
pp. 2297-2300
Author(s):  
Jia Zhou ◽  
Qun Shao ◽  
Hui Xu ◽  
Xiao Cheng Ma ◽  
Sen Li
Keyword(s):  
Mine Water ◽  
Hydraulic System ◽  
High Efficiency ◽  
Chloride Ion ◽  
Hydraulic Control ◽  
Hydraulic Support ◽  
High Productivity ◽  
Treatment Processes ◽  
Working Face ◽  
Hydraulic Control System

Hydraulic system is the core driving power of hydraulic support, and its performance directly affects the use of hydraulic support. The content of chloride ion in hydraulic transmission medium is one of the important reasons for the working failure of hydraulic support. Nowadays our country mainly uses the simply treated mine water as fluid in the hydraulic support system. In order to ensure hydraulic support can work safely and reliably underground, this study selected two representative kinds of mine fields in Huainan coal mine area, focusing on the analysis of the various factors which influence the introduction of chloride ion in the transmission medium of hydraulic support, and exploring the solution. The experimental results showed that different crude mine water and different water treatment processes were the main factors of introducing chloride ion. The study has important guiding significance of safely using Electro-hydraulic Control System in hydraulic support and achieving high productivity and high efficiency of the fully mechanized working face.

scholarly journals Tomato Leaf Disease Diagnosis Based on Improved Convolution Neural Network by Attention Module

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 651
Author(s):  
Shengyi Zhao ◽  
Yun Peng ◽  
Jizhan Liu ◽  
Shuo Wu
Keyword(s):  
Neural Network ◽  
High Performance ◽  
Model Comparison ◽  
Research Direction ◽  
Disease Diagnosis ◽  
Tomato Leaf ◽  
Identification Accuracy ◽  
Main Research ◽  
Proposed Model ◽  
Complex Features

Crop disease diagnosis is of great significance to crop yield and agricultural production. Deep learning methods have become the main research direction to solve the diagnosis of crop diseases. This paper proposed a deep convolutional neural network that integrates an attention mechanism, which can better adapt to the diagnosis of a variety of tomato leaf diseases. The network structure mainly includes residual blocks and attention extraction modules. The model can accurately extract complex features of various diseases. Extensive comparative experiment results show that the proposed model achieves the average identification accuracy of 96.81% on the tomato leaf diseases dataset. It proves that the model has significant advantages in terms of network complexity and real-time performance compared with other models. Moreover, through the model comparison experiment on the grape leaf diseases public dataset, the proposed model also achieves better results, and the average identification accuracy of 99.24%. It is certified that add the attention module can more accurately extract the complex features of a variety of diseases and has fewer parameters. The proposed model provides a high-performance solution for crop diagnosis under the real agricultural environment.

Review on Relationships of Temperature History, Fatigue Damage and Microstructure Evolution Mechanism of Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 944-950 ◽  
Author(s):  
Dong Fu Zhao ◽  
Mei Liu ◽  
Shi Ji Zhang
Keyword(s):  
High Temperature ◽  
Fatigue Damage ◽  
Microstructure Evolution ◽  
Research Direction ◽  
Concrete Research ◽  
Temperature History ◽  
Evolution Mechanism ◽  
Main Research ◽  
High Temperature Process ◽  
Application Prospects

The domestic and overseas research progresses of microstructure of the concrete and fatigue damage after treated by high temperature are reviewed. The main research direction and current shortage on the high temperature process, fatigue damage and the microstructure evolution mechanism of concrete are discussed. A view of the application prospects of concrete research on the high temperature process, fatigue damage and the microstructure evolution mechanism of concrete is forecast.

Deep learning approach for UHF RFID-based indoor localization

2021 ◽  
pp. 1-13
Author(s):  
Haishu Ma ◽  
Zongzheng Ma ◽  
Lixia Li ◽  
Ya Gao
Keyword(s):  
Radio Frequency Identification ◽  
Indoor Environment ◽  
Indoor Localization ◽  
Estimation Error ◽  
Research Direction ◽  
Linear Interpolation ◽  
Linear Mapping ◽  
Uhf Rfid ◽  
Indoor Location ◽  
Main Research

Due to the proliferation of the IoT devices, indoor location-based service is bringing huge business values and potentials. The positioning accuracy is restricted by the variability and complexity of the indoor environment. Radio Frequency Identification (RFID), as a key technology of the Internet of Things, has became the main research direction in the field of indoor positioning because of its non-contact, non-line-of-sight and strong anti-interference abilities. This paper proposes the deep leaning approach for RFID based indoor localization. Since the measured Received Signal Strength Indicator (RSSI) can be influenced by many indoor environment factors, Kalman filter is applied to erase the fluctuation. Furthermore, linear interpolation is adopted to increase the density of the reference tags. In order to improve the processing ability of the fingerprint database, deep neural network is adopted together with the fingerprinting method to optimize the non-linear mapping between fingerprints and indoor coordinates. The experimental results show that the proposed method achieves high accuracy with a mean estimation error of 0.347 m.

A Review of Switched Inertance Hydraulic Converter Technology

2018 ◽  
Author(s):  
Chenggang Yuan ◽  
Min Pan ◽  
Andrew Plummer
Keyword(s):  
Power Management ◽  
Energy Efficient ◽  
Control Strategies ◽  
New Technology ◽  
High Energy ◽  
Management Systems ◽  
Hydraulic Power ◽  
Controlled Systems ◽  
Hydraulic Machines ◽  
And Control

Digital hydraulics is a new technology providing an alternative to conventional proportional or servovalve-controlled systems in the area of fluid power. Research is driven by the need for highly energy efficient hydraulic machines but is relatively immature compared to other energy-saving technologies. Digital hydraulic applications, such as digital pumps, digital valves and actuators, switched inertance hydraulic converters (SIHCs) and digital hydraulic power management systems, all promise high energy efficiency. This review introduces the development of SIHCs and evaluates the device configurations, performance and control strategies that are found in current SIHC research, particularly focusing on the work being undertaken in last 15 years. The designs for highspeed switching valves are evaluated, and their advantages and limitations are discussed. This article concludes with some suggestions for the future development of SIHCs.

Electro Hydraulic Control Harmonic Aging Stress Elimination Devices - Modeling and Simulation of the Shock Excitation Part

2011 ◽  
Vol 127 ◽  
pp. 439-443
Author(s):  
Hui Wang ◽  
Meng Li
Keyword(s):  
Modeling And Simulation ◽  
System Optimization ◽  
Hydraulic Control ◽  
Shock Excitation ◽  
Main Research ◽  
Interactive Environment ◽  
Development Data ◽  
Set Up ◽  
High Level ◽  
Dynamics Characteristic

The main research is the dynamics characteristic of the shock excitation part of electro hydraulic control harmonic aging stress elimination devices. Use the system dynamics knowledge to set up a dynamics model of the shock excitation part. Analyze the transfer function of system and then use MATLAB to draw graphics under the condition of different parameters. Through the simulation graphic's analysis, we can obtain the influence of various parameters on system model, so as to provide a reference for the system optimization. MATLAB is abbreviation of Matrix Laboratory, which is used for algorithm development, data visualization, data analysis and numerical calculation of high-level technical computing language and interactive environment. It is useful for us in modeling and simulation.

Dynamic Analysis and Simulation of the Hydraulic Control System on the Remote-Controlled Explosive Ordnance Disposal Machine

2021 ◽  
Vol 11 (3) ◽  
pp. 37-54
Author(s):  
Dat Duy Nguyen ◽  
Dat Van Chu ◽  
Le Van Sy
Keyword(s):  
Hydraulic System ◽  
Specific Power ◽  
Hydraulic Control ◽  
Controlled System ◽  
Main Target ◽  
High Specific Power ◽  
Explosive Ordnance Disposal ◽  
The Military ◽  
Functional Components ◽  
Bomb Disposal

The remote-controlled explosive ordnance disposal machine, an important device used in the military, has been developed in many countries. It has become more intelligent and multi-functional due to being integrated with many functional components. New generations have been equipped with a completely remote-controlled system and high-resolution cameras. In bomb disposal work, this integrated machine can be used to replace other single-operating machines which allow to reduce greatly consuming time and labor effort as well as safety for operators. There are significant distinctions in design among well-known manufacturers. One of important components of this machine is hydraulic system that drives operating equipment of the machine. This paper focuses on analyzing and simulating dynamic model of the hydraulic system during the bomb laying process. The main target of this study is to meet the requirements for controlling a remote-controlled explosive ordnance disposal machine with high specific power, low hysteresis, high precision control, which ensures precision operation and safety.

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