scholarly journals Research on the Correction of the Linkage Hydraulic System of the Composite Hydraulic Gripper Used in Coal Mine Rigs

2021 ◽  
Vol 2095 (1) ◽  
pp. 012060
Author(s):  
Qingfeng Wang ◽  
Hang Chen
Keyword(s):  
Hydraulic System ◽  
Theoretical Foundation ◽  
Stable Condition ◽  
Field Tests ◽  
Feedback System ◽  
Simulating Analysis ◽  
Pressure Feedback ◽  
Kinetic Pressure ◽  
Drill Pipes ◽  
Major Factors

Abstract The research against the defect that the gripper of the rig using a traditional linkage hydraulic system always clips back to damage drill pipes when the rig starts to rotate is presented. The correcting solution of a kinetic pressure feedback system including a damper and an accumulator is described by establishing the transfer function of the linkage system and analysing major factors making the gripper to clip back. Taking the ZYWL-4000SY automatic rig for instance, the linkage hydraulic system after correction is compared with that of before in simulating analysis and the correcting solution is verified by both lab and field tests. The results show that the corrected gripper works well without hurting pipes and the rig operates in good and stable condition. The theoretical foundation and method are provided to design and test the linkage function of the composite hydraulic gripper of other similar rigs.

The Parameter Performances and Simulations of Nitrogen-Inflating Hydraulic Breaker Based on AMESim

2014 ◽  
Vol 988 ◽  
pp. 625-629
Author(s):  
Yu Wan Cen ◽  
Liang Wu ◽  
Xiao Hua Ye ◽  
Ye Ye
Keyword(s):  
Flow Rate ◽  
Concrete Structure ◽  
Hydraulic System ◽  
Theoretical Foundation ◽  
Entire System ◽  
Pipe Length ◽  
Pressure Pipe ◽  
Pressure Feedback ◽  
Working Principle ◽  
At Home

After analyzing the technology of hydraulic breakers at home and abroad, this paper develops a new nitrogen-inflating hydraulic breaker based on the pressure feedback. Its concrete structure, the working principle and the hydraulic system are discussed. Then the entire system is built and simulated by using AMESim software. Impact performances are studied when some factors such as feedback pressure, pipe length and flow rate are changed. With all the achievements mentioned above, it provides a theoretical foundation for a further understanding of the hydraulic breaker.

A Hydroelectric Plant Simulation Model to Test the Performance of Actual Governor Control Systems

2008 ◽  
Author(s):  
Iva´n F. Galindo-Garci´a ◽  
Antonio Tavira-Mondrago´n ◽  
Sau´l Rodri´guez-Lozano
Keyword(s):  
Power Plant ◽  
Simulation Model ◽  
Control Systems ◽  
Real Time ◽  
Hydraulic System ◽  
Hydroelectric Plant ◽  
Field Tests ◽  
Hydroelectric Power Plant ◽  
Hydroelectric Power ◽  
Surge Tank

A simulation model of the hydraulic system of a hydroelectric power plant is developed and implemented in a real time simulator. The main purpose of the simulator is to test the performance of actual governor control systems using hardware-in-the-loop techniques, in which the actual governor control system is connected to a real time simulator instead of being connected to real equipment. This paper focuses on the modeling of the hydraulic system to be implemented in the simulator. The model consists of an unrestricted reservoir, conduits to transport water, and a turbine to convert the potential energy of the fluid into mechanical power. A nonlinear mathematical model for a non-elastic water column is implemented. Effects due to a surge tank and to various turbines connected to a common tunnel are included in the model by considering head and flow variations at the junction of the common tunnel and the individual penstocks. The model is evaluated by comparing results from simulations with field tests from a four-unit hydroelectric power plant (55 MW per unit). Comparisons show that the model reproduces the general behavior of the field tests. However some deviations are observed during the transient response, in particular the simulation results appear to respond faster than field data.

An Automated System for Controlling the Laminar Flow Interface in a Microfluidic System

2004 ◽  
Author(s):  
Brandon Kuczenski ◽  
Philip R. LeDuc ◽  
William C. Messner
Keyword(s):  
Laminar Flow ◽  
Feedback System ◽  
Microfluidic System ◽  
Automated System ◽  
Time Varying ◽  
Relative Flow Rate ◽  
Microfluidic Network ◽  
Piezoresistive Pressure Sensor ◽  
Pressure Feedback ◽  
And Performance

The interface between adjacent laminar flow streams in the output channel of a Y-shaped confluent microfluidic network is useful for investigating the response of individual living cells to steep chemical gradients. This paper reports the design and performance of an automated pressure-feedback system for accurately and rapidly changing the position of that interface. The device will be employed to investigate the dynamic response of cells to time-varying chemical stimulation. The system works by controlling the pressure difference between the two adjoining inputs of the microfluidic network, altering the relative flow rate of the laminar streams in the output microchannel. Continuity of incompressible fluids dictates that the plane of the interface between the two streams will move from side to side as the flow rates change. The sample-data control system samples a temperature-compensated monolithic piezoresistive pressure sensor at 1 kilohertz, allowing the control of high-bandwidth microfluidic systems. This automated system enables long-duration, high-precision experiments that involve time-varying parameters to be performed simply, rapidly, and inexpensively.

Development of a feedback interface for in-situ soundscape evaluation

2021 ◽  
Vol 263 (4) ◽  
pp. 2253-2258
Author(s):  
Furi Andi Karnapi ◽  
Bhan Lam ◽  
Trevor Wong ◽  
Kenneth Ooi ◽  
Zhen-Ting Ong ◽  
...  
Keyword(s):  
Low Cost ◽  
Subjective Evaluation ◽  
Field Tests ◽  
Feedback System ◽  
Subjective Assessments ◽  
Wear And Tear ◽  
Human Participants ◽  
Microcontroller Unit ◽  
Intuitive Interface

Studies involving subjective evaluation require feedback from human participants to assess the performance of a system or an environment. A participant is typically presented with a set of metrics to be observed and they present their assessment accordingly. Investigator-led in-situ soundscape evaluation in ISO 12913-2 collects perceptual responses along with other acoustical and locale information. This is a labor intensive and time-consuming processes. To alleviate and complement investigator-led evaluations, a portable and compact feedback system with an e-ink display and capacitive buttons was designed, and is undergoing field tests to address the aforementioned requirements. The system employs a low-cost, low-power microcontroller unit (MCU) with necessary hardware interfaces to enable capacitive sensing. Capacitive buttons provide an intuitive interface and avoid the inherent wear and tear of mechanical buttons. This digitized feedback interface affords the flexibility to synchronize (wired or wirelessly) with a playback system to evaluate an augmented soundscape, and is suitable for both supervised and unsupervised subjective assessments.

Filtration rate and stop-flow pressure feedback responses to nephron perfusion in the dog

1978 ◽  
Vol 234 (2) ◽  
pp. F154-F165 ◽  
Author(s):  
P. D. Bell ◽  
C. Thomas ◽  
R. H. Williams ◽  
L. G. Navar
Keyword(s):  
Filtration Rate ◽  
Feedback System ◽  
Electrolyte Solutions ◽  
Feedback Mechanism ◽  
Perfusion Rate ◽  
Glomerular Function ◽  
Pressure Feedback ◽  
Flow Pressure ◽  
Distal Perfusion ◽  
Stop Flow

Experiments were performed to evaluate the influence of the distal tubular feedback mechanism on glomerular function in the dog. Single nephron glomerular filtration rate (SNGFR) and stop-flow pressure (SFP) were measured from early segments of proximal tubules during alterations in distal perfusion rate (via a late proximal puncture site) and perfusate composition. Perfusion rate (PR) was varied from 16 to 68 nl/min with a microperfusion pump. The intermediate segment of the nephron was blocked with a solid wax cast, thus preventing retrograde influences of the microperfusion procedure. During perfusion with an ultrafiltrate of plasma and an artificial tubular fluid solution (ATF), SNGFR decreased from 63 +/- 2.6 (SE) nl/min at a PR of 16 nl/min to 20 +/- 2.4 nl/min at a PR of 63 +/- 2.6 nl/min. At a PR of 16 nl/min, SFP was 48 +/- 1.3 mmHg with ultrafiltrate and ATF. Increases in PR to 68 nl/min led to a reduction in SFP to 26 +/- 1.5 mmHg. SFP was also measured during changes in PR with various electrolyte solutions of decreasing complexity. Elimination or substitution of Na+, K+, Cl-, HCO3-, and Ca2+ did not significantly alter the magnitude of the feedback response to increases in PR to 68 nl/min. These results confirm the existence of a feedback system in the dog capable of adjusting glomerular function in response to changes in distal perfusion rate. The results based on the various perfusion solutions fail to indicate a unique requirement for any specific component.

scholarly journals A Foreign Body Through the Shoe of a Person With Diabetic Peripheral Neuropathy Alters Contralateral Biomechanics: Captured Through Innovative Plantar Pressure Technology

2018 ◽  
Vol 17 (2) ◽  
pp. 125-129 ◽  
Author(s):  
Katie E. Chatwin ◽  
Caroline A. Abbott ◽  
Prabhav N. Reddy ◽  
Frank L. Bowling ◽  
Andrew J. M. Boulton ◽  
...  
Keyword(s):  
Peripheral Neuropathy ◽  
Plantar Pressure ◽  
Diabetic Peripheral Neuropathy ◽  
Center Of Pressure ◽  
Foot Ulcer ◽  
Feedback System ◽  
Innovative Technology ◽  
Limited Mobility ◽  
Pressure Feedback ◽  
The Right

High plantar pressure as a result of diabetic peripheral neuropathy is often reported as a major risk factor for ulceration. However, previous studies are confined to laboratories with equipment limited by cables, reducing the validity of measurements to daily life. The participant concerned in this case report was wearing an innovative plantar pressure feedback system as part of a wider study. The system allows for continuous plantar pressure monitoring and provides feedback throughout all activities of daily living. The participant concerned was a 59-year-old male with type 2 diabetes who presented with severe peripheral neuropathy. In addition, the right ankle had previously undergone fusion. Between monthly study appointments, the participant unknowingly had a screw embedded in his right shoe, while pressure was being recorded. Although no significant differences in pressure were present for the right foot with the embedded screw, the contralateral foot showed significantly higher pressure when the screw was embedded, compared with pre and post time periods. The increase in pressure on the contralateral foot is expected to result from the protrusion of the screw in the right shoe, causing a perturbation to balance and a shift in the center of pressure toward the contralateral side. This compensatory effect is likely to have been magnified by the limited mobility of the fused right ankle. These findings highlight the importance of checking both feet for ulcer risk, in the event of receiving high-pressure feedback. This innovative technology may improve our understanding of diabetic plantar foot ulcer development.

The Design of Hydraulic Vibratory Fruit-Vine Separation System for Processing Tomato

2013 ◽  
Vol 774-776 ◽  
pp. 224-230
Author(s):  
Cheng Song Li ◽  
Jing Li Qu ◽  
Le Wang ◽  
Rong Qing Liang ◽  
Za Kan
Keyword(s):  
Hydraulic System ◽  
Theoretical Foundation ◽  
Tomato Fruit ◽  
Operating Conditions ◽  
Block Type ◽  
Separation System ◽  
Processing Tomato ◽  
Result Show ◽  
Tomato Processing ◽  
Separation Devices

Fruit-vine separation devices of processing tomato are being used for self-propelled tomato harvesters, while the traditional eccentric block-type processing tomato fruit-vine separation devices are structurally complex and requiring the assembly of high precision. In order to improve the fruit-vine vibration separation system, the parameters of the operating conditions of 4FZ-30 self-propelled processing tomato harvest machine eccentric separation devices as well as other models with hydraulic system both at home and abroad have been analyzed, meanwhile the full hydraulic vibration system for the tomato processing separation of the fruit-vine have been studied and designed. The result show that this hydraulic system can match the control system and work normally and reliably, which has laid the theoretical foundation for the improvement of devices of the tomato processing fruit-vine separation.

scholarly journals Experimental Study of the Direct Drive Hydraulic System with the Torque Mode

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 941
Author(s):  
Chenyang Zhang ◽  
Hongzhou Jiang
Keyword(s):  
Transfer Function ◽  
Dynamic Characteristics ◽  
Control Strategy ◽  
Hydraulic System ◽  
Parallel Mechanism ◽  
Dynamic Pressure ◽  
Second Order ◽  
Direct Drive ◽  
Pressure Feedback ◽  
Speed Mode

The torque mode is more suitable for the direct drive 6 degree of freedom (6-DOF) parallel mechanism than the speed mode that both dynamic coupling and current coupling among motors are easily solved, but its key parameters and dynamic characteristics have never been studied, which are important and are the goals of this paper. First the hydraulic system of the direct drive 6-DOF parallel mechanism is simplified. Then the transfer function of the direct drive hydraulic system with the torque mode is deduced together with that of the speed mode. Finally, comparative experiments are conducted. Results show that the dynamic characteristics of the system with the torque mode which are generally worse than those with the speed mode, are mainly determined by the parameters of the motor-pump second-order element of the transfer function composed of two under-damped second-order elements, proportion differentiation (PD) control strategy and dynamic pressure feedback (DPF) control strategy are useful for the system with the torque mode, but practical and effective methods are still needed.

Sign in / Sign up

Export Citation Format

Share Document