scholarly journals Research on Stability of Sand Core Handling Robot System Based on PID Control

2021 ◽  
Vol 2101 (1) ◽  
pp. 012044
Author(s):  
Xianxin Lin ◽  
Guojin Li ◽  
Qian Su ◽  
Xi Li
Keyword(s):  
Pid Controller ◽  
Industrial Robot ◽  
Mechanical Vibration ◽  
System Stability ◽  
Excessive Pressure ◽  
Sand Core ◽  
Response Performance ◽  
Parameter Values ◽  
The Impact ◽  
The Mathematical Model

Abstract When an industrial robot uses a gripper with half hardness and flexibility to carry a hollow sand core, mechanical vibration will cause the gripper to grasp the sand core unsteadily or cracks in the sand core due to excessive pressure. In this paper, the mathematical model is constructed based on the elements such as gripper structure, clamping pressure and mechanical vibration, the system stability is analyzed, the PID controller is added for correction, the parameter values of Kp, Ti and Td are set by Ziegler-Nichols method, the transfer function of PID controller is obtained, and then the corrected system function is calculated. The dynamic response performance of the system is simulated and analyzed by Matlab / Simulink, the parameters in the PID controller are adjusted, and the overshoot of the system is reduced from 85% to 25%, which effectively reduces the impact of mechanical vibration interference on the sand core and realizes the optimal control of the system.

scholarly journals Vibration Control of Load for Jib Crane by using PID Controller

2020 ◽  
Vol 27 (3) ◽  
pp. 89-96
Author(s):  
Fares Abbas ◽  
Tawfik Al Massoud
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Vibration Control ◽  
Mechanical Model ◽  
Pid Controller ◽  
Integrated Production ◽  
Production Processes ◽  
Matlab Program ◽  
The Impact ◽  
The Mathematical Model

Jib Crane is a type of machinery used mainly to raise or lower materials or heavy objects and to carrying them to other places. It is used in construction and in the installation of large machines such as wind turbines and harbors, and is an essential component of integrated production processes. Because of the large loads carried by these cranes it became necessary to know their behavior before investment by studying their movements and studying the vibration of payloads and work to reduce them as much as possible and thus prolong the life of the crane components and increase their efficiency. Hence the need to design a control system to dampen load vibration to reduce the impact of dynamics affecting the parts of the crane. In this research, the mathematical model similar to the mechanical model of the crane was prepared and solving the model using MATLAB program, and then design a proportional integral differential controller for jib crane

Frequency regulation of a weakly connected microgrid using the fuzzy-PID controller

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Meriem Nachidi
Keyword(s):  
Pid Controller ◽  
System Stability ◽  
Frequency Regulation ◽  
Connection Strength ◽  
Fuzzy Pid ◽  
Fuzzy Pid Controller ◽  
Acceptable Range ◽  
Self Tuning ◽  
High Level ◽  
The Impact

AbstractMicrogrid system stability is a major source of concern due to the rapid increase in load demand and a high level of renewable energy penetration. During the grid- connected mode, the microgrid power quality is mainly affected by the level of connection strength with the host grid. Thus, this paper aims to investigate the impact of the implemented control strategy in the microgrid, on frequency response when its level of connection strength is weak, that is, the frequency and voltage are not dominantly controlled by the grid. A control scheme based on a fuzzy logic-based self-tuning PID controller (fuzzy-PID) is used to maintain the frequency within the acceptable range. Simulations illustrate that the frequency dynamic response of the microgrid guarantees a good performance using the fuzzy-PID controller despite a large drop in grid inertia and the presence of disturbances whereas the classical PID controller cannot maintain the frequency within the acceptable range.

scholarly journals Inventory Control Systems Model for Strategic Capacity Acquisition

2016 ◽  
Vol 2016 ◽  
pp. 1-16
Author(s):  
Anthony S. White ◽  
Michael Censlive
Keyword(s):  
Pid Controller ◽  
Production Capacity ◽  
Sales Force ◽  
Loop Model ◽  
Capacity Control ◽  
Dynamics Model ◽  
Systems Model ◽  
Parameter Values ◽  
The Impact ◽  
Capacity Acquisition

Variation of installed industrial capacity has been found to follow a cyclic pattern. This paper discusses the application of control theory to the problem of the timely acquisition of extra production capacity. The control system based model presented here is compared with a System Dynamics model proposed by Sterman. Key differences are the method of implementing rational decisions about deployment of extra capacity and the use of a nonlinear APVIOBPCS inventory model. Benefits of this new model are a more measurable process and the ability to select parameter values to optimise capacity deployment. Simulation of the model indicates that the results found by Sterman underestimate the production backlog and time taken to reach equilibrium. The use of a Proportional, Integral, and Derivative (PID) controller in the capacity control loop model illustrates that it is possible not only to alter the backlog levels but at the same time to reduce the sales force and improve the revenue. The model also shows clearly that the impact of not increasing capacity promptly results in catastrophic failure of sales as a structural, rather than a business, problem. This model is simple enough to be implemented as a spreadsheet for use as a guide by managers.

scholarly journals Mathematical Modelling of COVID-19 Transmission in Kenya: A Model with Reinfection Transmission Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Isaac Mwangi Wangari ◽  
Stanley Sewe ◽  
George Kimathi ◽  
Mary Wainaina ◽  
Virginia Kitetu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Critically Ill ◽  
Physical Distance ◽  
Contact Tracing ◽  
Medical Attention ◽  
Proposed Model ◽  
Asymptomatic Individuals ◽  
Parameter Values ◽  
The Impact ◽  
The Mathematical Model

In this study we propose a Coronavirus Disease 2019 (COVID-19) mathematical model that stratifies infectious subpopulations into: infectious asymptomatic individuals, symptomatic infectious individuals who manifest mild symptoms and symptomatic individuals with severe symptoms. In light of the recent revelation that reinfection by COVID-19 is possible, the proposed model attempt to investigate how reinfection with COVID-19 will alter the future dynamics of the recent unfolding pandemic. Fitting the mathematical model on the Kenya COVID-19 dataset, model parameter values were obtained and used to conduct numerical simulations. Numerical results suggest that reinfection of recovered individuals who have lost their protective immunity will create a large pool of asymptomatic infectious individuals which will ultimately increase symptomatic individuals with mild symptoms and symptomatic individuals with severe symptoms (critically ill) needing urgent medical attention. The model suggests that reinfection with COVID-19 will lead to an increase in cumulative reported deaths. Comparison of the impact of non pharmaceutical interventions on curbing COVID19 proliferation suggests that wearing face masks profoundly reduce COVID-19 prevalence than maintaining social/physical distance. Further, numerical findings reveal that increasing detection rate of asymptomatic cases via contact tracing, testing and isolating them can drastically reduce COVID-19 surge, in particular individuals who are critically ill and require admission into intensive care.

Design of spline surface vacuum gripper for pick and place robotic arms

2020 ◽  
Vol 4 (2) ◽  
pp. 48-55
Author(s):  
A. S. Jamaludin ◽  
M. N. M. Razali ◽  
N. Jasman ◽  
A. N. A. Ghafar ◽  
M. A. Hadi
Keyword(s):  
Cycle Time ◽  
Industrial Robot ◽  
Annealing Process ◽  
Vacuum Suction ◽  
Robotic Arms ◽  
Custom Made ◽  
Pick And Place ◽  
Manufacturing Procedure ◽  
Production Flexibility ◽  
The Impact

The gripper is the most important part in an industrial robot. It is related with the environment around the robot. Today, the industrial robot grippers have to be tuned and custom made for each application by engineers, by searching to get the desired repeatability and behaviour. Vacuum suction is one of the grippers in Watch Case Press Production (WCPP) and a mechanism to improve the efficiency of the manufacturing procedure. Pick and place are the important process for the annealing process. Thus, by implementing vacuum suction gripper, the process of pick and place can be improved. The purpose of vacuum gripper other than design vacuum suction mechanism is to compare the effectiveness of vacuum suction gripper with the conventional pick and place gripper. Vacuum suction gripper is a mechanism to transport part and which later sequencing, eliminating and reducing the activities required to complete the process. Throughout this study, the process pick and place became more effective, the impact on the production of annealing process is faster. The vacuum suction gripper can pick all part at the production which will lower the loss of the productivity. In conclusion, vacuum suction gripper reduces the cycle time about 20%. Vacuum suction gripper can help lower the cycle time of a machine and allow more frequent process in order to increase the production flexibility.

Heterotrophic Kinetic Parameter Estimation for Enhanced Biological Phosphorus Removal Processes Operated in Conventional and Membrane-Assisted Modes

2006 ◽  
Vol 41 (1) ◽  
pp. 72-83 ◽  
Author(s):  
Zhe Zhang ◽  
Eric R. Hall
Keyword(s):  
Parameter Estimation ◽  
Phosphorus Removal ◽  
Growth Yield ◽  
Pilot Scale ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Parameter Values ◽  
The Impact ◽  
Biological Phosphorus

Abstract Parameter estimation and wastewater characterization are crucial for modelling of the membrane enhanced biological phosphorus removal (MEBPR) process. Prior to determining the values of a subset of kinetic and stoichiometric parameters used in ASM No. 2 (ASM2), the carbon, nitrogen and phosphorus fractions of influent wastewater at the University of British Columbia (UBC) pilot plant were characterized. It was found that the UBC wastewater contained fractions of volatile acids (SA), readily fermentable biodegradable COD (SF) and slowly biodegradable COD (XS) that fell within the ASM2 default value ranges. The contents of soluble inert COD (SI) and particulate inert COD (XI) were somewhat higher than ASM2 default values. Mixed liquor samples from pilot-scale MEBPR and conventional enhanced biological phosphorus removal (CEBPR) processes operated under parallel conditions, were then analyzed experimentally to assess the impact of operation in a membrane-assisted mode on the growth yield (YH), decay coefficient (bH) and maximum specific growth rate of heterotrophic biomass (µH). The resulting values for YH, bH and µH were slightly lower for the MEBPR train than for the CEBPR train, but the differences were not statistically significant. It is suggested that MEBPR simulation using ASM2 could be accomplished satisfactorily using parameter values determined for a conventional biological phosphorus removal process, if MEBPR parameter values are not available.

scholarly journals Electric Vehicles in Jordan: Challenges and Limitations

2021 ◽  
Vol 13 (6) ◽  
pp. 3199
Author(s):  
Laith Shalalfeh ◽  
Ashraf AlShalalfeh ◽  
Khaled Alkaradsheh ◽  
Mahmoud Alhamarneh ◽  
Ahmad Bashaireh
Keyword(s):  
Electric Vehicles ◽  
Distribution System ◽  
Distribution Systems ◽  
Environmental Benefits ◽  
System Stability ◽  
Loading Conditions ◽  
Stability Margins ◽  
High Penetration ◽  
Node Distribution ◽  
The Impact

An increasing number of electric vehicles (EVs) are replacing gasoline vehicles in the automobile market due to the economic and environmental benefits. The high penetration of EVs is one of the main challenges in the future smart grid. As a result of EV charging, an excessive overloading is expected in different elements of the power system, especially at the distribution level. In this paper, we evaluate the impact of EVs on the distribution system under three loading conditions (light, intermediate, and full). For each case, we estimate the maximum number of EVs that can be charged simultaneously before reaching different system limitations, including the undervoltage, overcurrent, and transformer capacity limit. Finally, we use the 19-node distribution system to study these limitations under different loading conditions. The 19-node system is one of the typical distribution systems in Jordan. Our work estimates the upper limit of the possible EV penetration before reaching the system stability margins.

Analysis of the intervention effect and self-satisfaction of sports dance exercise on the psychological stress of college students

Work ◽  
2021 ◽  
pp. 1-13
Author(s):  
Changliang Zheng ◽  
Hongmei Ji
Keyword(s):  
College Students ◽  
Stress Response ◽  
Psychological Stress ◽  
Rating Scale ◽  
Response Characteristic ◽  
Control Group ◽  
Observation Group ◽  
Excessive Pressure ◽  
Psychological Pressure ◽  
The Impact

BACKGROUND: College students are a high-risk subpopulation of psychological disorders. The problem of various adverse phenomena and consequences caused by excessive pressure on college students has gradually become the focus of social and psychological academic circles. However, studies related to individual self-concept and psychological pressure are rare. OBJECTIVE: To explore the impact of sports dance exercises on college students’ psychological pressure and improve the psychological effects of their self-satisfaction. METHODS: College students were taken as research objects, randomly divided into a control group and an observation group. The observation group is intervened with sports dance exercises. The observation group was intervened with sports dance exercises. The stress response characteristic questionnaire and multidimensional self-satisfaction rating scale were utilized to measure college students’ conditions before and after the intervention. Finally, the obtained data were statistically analyzed. RESULTS: Generally, the psychological stress response of college students was mild, with self-satisfaction and various dimensions at a moderately higher level. No significant differences were discovered in the psychological stress response and self-satisfaction level between the control group and the observation group before intervention (P >  0.05), which were homogeneous. Compared with the data obtained before the intervention, after the intervention, the control group scores were slightly reduced in all dimensions of the psychological stress response and self-satisfaction. In contrast, the scores were significantly increased in the experimental group (P <  0.05). Psychological stress response could reliably explain 30.4%of the total self-satisfaction variance (P <  0.01). The negative self-evaluation was the most important variable affecting self-satisfaction, followed by poor interpersonal communication and poor sleeping quality. CONCLUSIONS: Sports dance exercises could alleviate the psychological stress of college students and improve their self-satisfaction. Colleges and universities should include sports dance in the content of optional public courses and encourage more college students to actively participate in sports dance exercises to improve their mental health.

scholarly journals The Impact of Elongation on Change in Electrical Resistance of Electrically Conductive Yarns Woven into Fabric

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3390
Author(s):  
Željko Knezić ◽  
Željko Penava ◽  
Diana Šimić Penava ◽  
Dubravko Rogale
Keyword(s):  
Mathematical Model ◽  
Electrical Resistance ◽  
Electrically Conductive ◽  
Textile Materials ◽  
Measurement Results ◽  
Conductive Yarns ◽  
Yarn Count ◽  
As Relationship ◽  
The Impact ◽  
The Mathematical Model

Electrically conductive yarns (ECYs) are gaining increasing applications in woven textile materials, especially in woven sensors suitable for incorporation into clothing. In this paper, the effect of the yarn count of ECYs woven into fabric on values of electrical resistance is analyzed. We also observe how the direction of action of elongation force, considering the position of the woven ECY, effects the change in the electrical resistance of the electrically conductive fabric. The measurements were performed on nine different samples of fabric in a plain weave, into which were woven ECYs with three different yarn counts and three different directions. Relationship curves between values of elongation forces and elongation to break, as well as relationship curves between values of electrical resistance of fabrics with ECYs and elongation, were experimentally obtained. An analytical mathematical model was also established, and analysis was conducted, which determined the models of function of connection between force and elongation, and between electrical resistance and elongation. The connection between the measurement results and the mathematical model was confirmed. The connection between the mathematical model and the experimental results enables the design of ECY properties in woven materials, especially textile force and elongation sensors.

Thermal performance comparison of different sun tracking configurations

2019 ◽  
Vol 88 (2) ◽  
pp. 20902
Author(s):  
O. Achkari ◽  
A. El Fadar
Keyword(s):  
Thermal Performance ◽  
Electricity Generation ◽  
Arid Regions ◽  
Performance Comparison ◽  
Water Desalination ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
The Impact ◽  
The Mathematical Model ◽  
Good Agreement

Parabolic trough collector (PTC) is one of the most widespread solar concentration technologies and represents the biggest share of the CSP market; it is currently used in various applications, such as electricity generation, heat production for industrial processes, water desalination in arid regions and industrial cooling. The current paper provides a synopsis of the commonly used sun trackers and investigates the impact of various sun tracking modes on thermal performance of a parabolic trough collector. Two sun-tracking configurations, full automatic and semi-automatic, and a stationary one have numerically been investigated. The simulation results have shown that, under the system conditions (design, operating and weather), the PTC's performance depends strongly on the kind of sun tracking technique and on how this technique is exploited. Furthermore, the current study has proven that there are some optimal semi-automatic configurations that are more efficient than one-axis sun tracking systems. The comparison of the mathematical model used in this paper with the thermal profile of some experimental data available in the literature has shown a good agreement with a remarkably low relative error (2.93%).

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