Practical Solution for Temperature Control for Inertial Object

2016 ◽  
Vol 251 ◽  
pp. 146-151
Author(s):  
Jordan Mężyk
Keyword(s):  
Temperature Control ◽  
Test Chamber ◽  
Control Object ◽  
Erosive Wear ◽  
Heating Process ◽  
Engineering Practice ◽  
Final Solution ◽  
Literature Research ◽  
Temperature Controller ◽  
Practical Applications

The issue of temperature control in the research devices is well known and well described in the literature. Yet in the practical applications, in every-day engineering practice there are situations where theoretical knowledge is not applicable in a straight forward manner and the proper settings of the controller parameters constitutes a problem to be addressed and solved with and individual approach. This article presents an example of commissioning of a heated test chamber that is a part of a research apparatus for testing the erosive wear of materials, developed and built at the Institute for Sustainable Technologies – National Research Institute in Radom.The test apparatus is used for eroding the surface of the tested sample with a stream of a mixture of air and an abrasive medium. The test can be performed in room temperature and in raised temperature, both for the ambient of the sample as well as for the air used to make a mixture. The maximal temperature allowed in the machine is 600°C, so the test chamber is equipped with a hermetic door and heat insulation. The construction of the chamber makes it very inertial in terms of heating and cooling, which makes the temperature control a bit challenging.The system is controlled with a PLC with software PID controller implemented in Temperature Controller library. The use of standard set-up of PID parameters resulted in heating with significant overshoot and long settling time which was unacceptable. Trials to tune the parameters with use of built-in algorithm resulted in slower heating and still didn’t eliminate the overshoot. The literature research and tests were performed to identify the problem and to implement simple solution.The article presents the selected results of the literature research and details on the performed tests. The algorithm of the final solution is presented and the characteristics of the heating process after the modification of the control algorithm. The final solution of the issue is an algorithm that uses the standard available temperature controller and the temperature monitor to influence the actions of the controller. The difficulties in identification of the control object (the chamber) caused the inability to solve the problem analytically, but the practical and empirical approach and several trials and errors allowed for the almost optimal control characteristics, which allows no overshoot and as fast as possible heating of the object.

Carbon Fiber Reinforced Rigidizable Space Structures

2005 ◽  
Vol 888 ◽  
Author(s):  
Stephen Andrew Sarles ◽  
Todd Bullions ◽  
Thompson Mefford ◽  
Judy Riffle ◽  
Don Leo
Keyword(s):  
Carbon Fiber ◽  
Temperature Control ◽  
Pi Controller ◽  
Space Structures ◽  
Heating Process ◽  
Thermosetting Resin ◽  
Resistive Heating ◽  
Flexible Space Structures ◽  
Material Stiffness ◽  
Reinforcing Material

ABSTRACTIn attempts to provide an active solution for the rigidization of flexible space structures, internal resistive heating is applied to a novel thermosetting resin. Carbon-fiber tow coated in U-Nyte Set 201A, which cures at ∼150°C, was heated by passing electric current through the reinforcing material. Using a proportional-integral (PI) controller, precise temperature control of the heating process was established. Samples cured via controlled internal resistive heating were heated to 160°C and underwent material consolidation in less than 7 minutes. A change in material stiffness was measured to be almost two orders of magnitude greater than that of an uncured material.

Optimization of LD’s Temperature Control System Using Finned Tubular Radiator

2012 ◽  
Vol 546-547 ◽  
pp. 800-805 ◽  
Author(s):  
Fei Guo ◽  
Wen Dong Zou ◽  
Hai He Xie ◽  
Qiang Du
Keyword(s):  
Thermal Conductivity ◽  
Temperature Control ◽  
Optimization Method ◽  
System Structure ◽  
Experimental Result ◽  
Temperature Control System ◽  
Air Cooling ◽  
Equivalent Thermal Conductivity ◽  
Temperature Controller ◽  
Control Efficiency

By analyzing of thermoelectric cooler(TEC) working characteristics and using one-dimensional heat transfer equation, mathematical relationship between TEC working power and radiator equivalent thermal conductivity is derived. Temperature control efficiency could be improved by increasing equivalent thermal conductivity was proved. So that an optimization method using finned tubular radiator in LD temperature controller was presented, including theoretical foundation of radiator selection and system structure. Compared with normal radiator, the stable-time of the LD temperature controller using finned tubular reduces 50%, and stable-error reduces 60%, which was proved by mathematical calculation and experimental result of 2W LD system. Compared with forced air cooling and forced water cooling, the system has property of low vibration disturbance and simple structure. It followed that the finned tubular radiator was suitable for temperature control of medium and small power LD, which can improve temperature control efficiency and optimize the system.

scholarly journals A System for Accurate Temperature Control of Small Fluid Baths

1979 ◽  
Vol 22 (87) ◽  
pp. 389-391
Author(s):  
V. I. Morgan
Keyword(s):  
Temperature Control ◽  
Electrical Heating ◽  
Temperature Controller ◽  
Accurate Temperature ◽  
Accurate Temperature Control

AbstractA temperature controller is described which uses a thermistor sensor and electrical heating to maintain the temperature of a small bath of fluid to within a few millidegrees.

scholarly journals The Feasibility of an Internal Gas-Assisted Heating Method for Improving the Melt Filling Ability of Polyamide 6 Thermoplastic Composites in a Thin Wall Injection Molding Process

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1004 ◽  
Author(s):  
Thanh Trung Do ◽  
Tran Minh The Uyen ◽  
Pham Son Minh
Keyword(s):  
Injection Molding ◽  
Heating Rate ◽  
Temperature Control ◽  
Cavity Surface ◽  
Heating Process ◽  
Injection Molding Process ◽  
Thin Wall ◽  
Molding Process ◽  
Filling Ability ◽  
Wall Injection

In thin wall injection molding, the filling of plastic material into the cavity will be restricted by the frozen layer due to the quick cooling of the hot melt when it contacts with the lower temperature surface of the cavity. This problem is heightened in composite material, which has a higher viscosity than pure plastic. In this paper, to reduce the frozen layer as well as improve the filling ability of polyamide 6 reinforced with 30 wt.% glass fiber (PA6/GF30%) in the thin wall injection molding process, a preheating step with the internal gas heating method was applied to heat the cavity surface to a high temperature, and then, the filling step was commenced. In this study, the filling ability of PA6/GF30% was studied with a melt flow thickness varying from 0.1 to 0.5 mm. To improve the filling ability, the mold temperature control technique was applied. In this study, an internal gas-assisted mold temperature control (In-GMTC) using different levels of mold insert thickness and gas temperatures to achieve rapid mold surface temperature control was established. The heating process was observed using an infrared camera and estimated by the temperature distribution and the heating rate. Then, the In-GMTC was employed to produce a thin product by an injection molding process with the In-GMTC system. The simulation results show that with agas temperature of 300 °C, the cavity surface could be heated under a heating rate that varied from 23.5 to 24.5 °C/s in the first 2 s. Then, the heating rate decreased. After the heating process was completed, the cavity temperature was varied from 83.8 to about 164.5 °C. In-GMTC was also used for the injection molding process with a part thickness that varied from 0.1 to 0.5 mm. The results show that with In-GMTC, the filling ability of composite material clearly increased from 2.8 to 18.6 mm with a flow thickness of 0.1 mm.

Current Practical Applications of Electroencephalography (EEG)

2019 ◽  
Vol 16 (12) ◽  
pp. 4943-4953
Author(s):  
Chi Qin Lai ◽  
Haidi Ibrahim ◽  
Mohd Zaid Abdullah ◽  
Jafri Malin Abdullah ◽  
Shahrel Azmin Suandi ◽  
...  
Keyword(s):  
Control Object ◽  
Literature Survey ◽  
Computer Interface ◽  
Medical Applications ◽  
Object Control ◽  
Practical Applications ◽  
Main Research ◽  
Brain Abnormality ◽  
Research Areas ◽  
Electroencephalogram Eeg

Electroencephalogram (EEG) is used to study the activities of human brain using instrument named electroencephalograph. The usage of EEG is now widened to many fields due to its great temporal resolution and other advantages. In this paper, a literature survey has been carried out to explore and categorize applications that have been invented from EEG. The literature survey is done on works from year 2011 up to the present. Three main research areas have been explored, which are medical applications, brain–computer interface and neuromarketing. In medical applications, EEG is used to detect brain abnormality, such as seizures or brain injury. As for BCI, many applications have been proposed for object control, object recognition, rehabilitation and human assistance. In neuromarketing, EEG is used to recognize consumers’ preference such as their preferable products or movies. This literature review shows that the research on EEG is still growing, and the area of applications are expanding.

scholarly journals Modelling aerated flows with smoothed particle hydrodynamics

2015 ◽  
Vol 17 (4) ◽  
pp. 493-504 ◽  
Author(s):  
Michael Meister ◽  
Wolfgang Rauch
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Bubble Column ◽  
Numerical Study ◽  
Air Entrainment ◽  
Future Perspective ◽  
Engineering Practice ◽  
Special Focus ◽  
Practical Applications ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Modelling aerated flows is a complex application of computational fluid dynamics (CFD) since the interfaces between air and water change rapidly. In this work, the simulation of aerated flows with the smoothed particle hydrodynamics (SPH) method is investigated with a focus towards the application in engineering practice. To prove the accuracy of the method, the processes of air entrainment and rising air bubbles are studied. Through monitoring the evolution of the bubble contours it is shown that the novel approach of adding artificial repulsion forces at the interface does not alter the dynamics but stabilizes the flow. Building on these fundamental processes we extend the discussion to practical applications with a special focus on forced aeration. Since the employment of a detailed SPH model to practical problems remains out of bounds due to the high computational demand, we propose a combined experimental and numerical study where experimental bubble characteristics are imposed on the numerical simulation. Based on the data of the conducted bubble column experiment, the computational demand is significantly decreased such that the oxygen consumption due to biokinetic processes can be modelled. The future perspective is to apply SPH to urban water systems, e.g., for simulating detailed processes in wastewater treatment and sewer hydraulics.

scholarly journals LabVIEW Based Temperature Controller using Arduino

2019 ◽  
Vol 8 (4) ◽  
pp. 6830-6835
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Temperature Control System ◽  
Microsoft Excel ◽  
Set Point ◽  
Temperature Controller ◽  
Cooling Fan ◽  
Automatic Temperature Control ◽  
Red Led ◽  
Green Led

The main aim of this paper provides to existing two types of temperature control system that are automatic temperature control system and manual control system using LABVIEW and Arduino. In this paper, we are designated LABVIEW based temperature controller using Arduino. In this paper, we are operated 5 volt cooling fan when the temperature goes to above the fixed point. Here, we will use LM35 temperature sensor and we are using three different LEDs or single RGB LED to indicate the range of temperature. The design and working operation will classified into three different categories that are first one is when the temperature is above the mark (set) point, in this case the Red LED will glows, second one is when the temperature exists between higher mark point and lower mark (set) point, in this case the Blue LED will glows and third one is when the temperature set the below set point, in this case the Green LED glows. The temperature reading also stored in Microsoft excel sheet. Here we used LABVIEW 2017 software version for designing temperature controller system. The remaining software’s also used for designing temperature controller system but the LabView is the simplest way of remaining all software’s.

On Piping Vibration Screening Criteria

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Nikola Jacimovic ◽  
Fabio D'Agaro
Keyword(s):  
Engineering Practice ◽  
Total System ◽  
System Failure ◽  
Screening Criteria ◽  
Literature Research ◽  
Short Time

Abstract Vibration-related issues are common in the engineering practice. Piping vibrations can range from those barely noticeable to the ones which result in total system failure in a very short time . This paper presents a synthesis of the criteria which should be used to estimate the severity of vibrations based on both exhaustive literature research and the authors' experience accumulated over the years of engineering practice.

scholarly journals Experimental and Numerical Study on the Effect of the Temperature-Control Curtain in Thermal Stratified Reservoirs

2019 ◽  
Vol 9 (24) ◽  
pp. 5354 ◽  
Author(s):  
Jijian Lian ◽  
Peiyao Li ◽  
Ye Yao ◽  
Wei He ◽  
Nan Shao
Keyword(s):  
Water Temperature ◽  
Temperature Control ◽  
Numerical Study ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Engineering Practice ◽  
Maximum Increase ◽  
Study Results ◽  
New Facility ◽  
Temperature Water

The impoundment and power generation of dams cause the temperature of released water much lower than the original rivers in the thermal stratified reservoirs. In addition, the released low-temperature water would damage the downstream habitats of fish and other biological groups seriously. Available facilities, such as stop log gate intakes and multi-level intakes, are built to alleviate the problem. For overcoming the limitations of traditional facilities on construction conditions and the improved effect of water temperature, a new facility of the temperature control curtain (TCC), with the advantages of convenient regulation and no hydropower loss, has been proposed recently. However, to the author’s knowledge, the theory of TCC is not abundant, with incomplete experimental tests and few numerical simulations. In this paper, a rectangular tank is designed specifically to conduct experimental tests to verify the effects of TCC and explore its potential impacts on released water temperature (RWT) under four major influencing factors. The study results show that TCC has significant effects on improving RWT, with a maximum increase of 8.3 °C. In addition, a three-dimensional hydrodynamic model with the same size of experimental model is established for further research. The results show that RWT is mainly related to the temperature distribution of a reservoir and the water-retaining proportion of the curtain. Finally, a basic principle for TCC construction is proposed and all these laid an important theory foundation for its application in engineering practice.

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