scholarly journals Investigation of the thermal effect of a tubular permanent magnet actuator with a water cooling channel for active lateral suspension of a high-speed train

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401881966
Author(s):  
Dong-wook Kim ◽  
Jung-Hyun Woo ◽  
Kyoung-Su Park
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Ride Comfort ◽  
Cooling System ◽  
Operating Conditions ◽  
Design Parameters ◽  
Water Cooling ◽  
Transfer Coefficients ◽  
Permanent Magnet Actuator ◽  
Water Cooling System

Worldwide, high-speed rail is becoming an increasingly popular and efficient means of transport. However, increasing the speed of a train leads to major reductions in stability and ride comfort. Here, we develop a tubular permanent magnet actuator to overcome these problems. To increase actuator thrust, the electromagnetic circuit requires a high current and, thus, becomes hot. We use a water cooling system with 12 straight copper channels to reduce the temperature. We calculate heat transfer coefficients using empirical convection correlations between laminar flow in the channels and experimental results. The predicted, tube surface temperatures correlated well with the experimental data. We evaluated the effects of flow rate and initial water temperature on various design parameters. The cooling system allowed application of a current greater than 100 A, developing a thrust force of over 8000 N. Thus, the system was robust under harsh operating conditions. We measured the thrust and cogging forces and the performance of the water cooling system in terms of the maximum acceptable temperature. The thrust was high and the cogging torque was low, greatly reducing lateral vibration; the temperature remained below the acceptable maximum.

Performance Characteristics of Capacity Control of Industrial Water Cooler Using Pulse Modulation Valves

2010 ◽  
Vol 297-301 ◽  
pp. 790-795
Author(s):  
W.J. Choi ◽  
H.W. Kim ◽  
Seung Moon Baek ◽  
H.J. Kang ◽  
Ho Saeng Lee ◽  
...  
Keyword(s):  
Machine Tools ◽  
Cooling System ◽  
Load Capacity ◽  
Suction Side ◽  
High Accuracy ◽  
Operating Conditions ◽  
Water Cooling ◽  
Pulse Modulation ◽  
Vapor Injection ◽  
Water Cooling System

Recently, the technical trend for machine tools is focused on enhancing of speed and accuracy. For high speed and high accuracy, the thermal deformation must minimize in machine tools. To minimize the thermal influence, accurate machine tools need to be adopted to a cooling system with high precision. In this study, we suggest a high accuracy water cooling system using PMV(Pulse Modulation Valve) control. In this system, we use a compressor which is able to be driven under the condition of unloading to improve the efficiency of the PMV control. And a vapor refrigerant from the suction side of the compressor is injected back into the compressor suction side using a solenoid valve. The PMV control can be used by this method. Also, by comparing with the existing ON-OFF control method on identical operating conditions, we evaluated the efficiency and reliability of the new method. This method showed a shorter reaction time than that of the existing method. Also, the efficiency and performance improved by lower compressor work using the vapor injection without compressor stop. This study shows that the COP of this system decreased when load capacity of compressor was decreasing. In addition, the precision of this system using PMV was higher than for the ON/OFF type. This result will be used for a basis data of comparative experiment with inverter control and to manufacture of high accuracy water cooling system.

Analysis of Sensor-Lance Samples for Basic Oxygen Furnace Control

1980 ◽  
Vol 34 (4) ◽  
pp. 447-452 ◽  
Author(s):  
T. R. Linde
Keyword(s):  
High Speed ◽  
Cooling System ◽  
High Volume ◽  
Basic Oxygen Furnace ◽  
Water Cooling ◽  
Steelmaking Process ◽  
Basic Oxygen ◽  
Furnace Control ◽  
Increase Productivity ◽  
Water Cooling System

As part of a new basic oxygen furnace (BOF) steelmaking control system, procedures were developed for rapidly handling and accurately analyzing steel samples taken with a sensor-lance from an upright vessel. Determinations must be: (1) accurate to control the steelmaking process and assure that the heats are made to specifications, and (2) rapid to reduce BOF turnabout time and thus provide the potential to increase productivity. A pneumatic tube carrier was developed to safely transport hot (2200°F) lance samples to the laboratory. The samples are cut and cooled simultaneously on a high-speed abrasive cutoff machine equipped with a specially designed sample clamp and a high-volume water cooling system. Initially, the analytical performance was not as good as that obtained from conventional cast disk samples. Analysis deviations were traced to large slag-type sulfur-bearing inclusions in the lance samples. Accurate analyses were then obtained by increasing the spectrometer preburn time from 3 to 15 s. More than 1000 trial heats have been made. The procedures we developed permit hot samples to be removed from the lance sampler, sent to the laboratory, analyzed, and reported in about 3 minutes.

scholarly journals The processes of vaporization in the porous structures working with the excess of liquid

2017 ◽  
Vol 21 (1 Part A) ◽  
pp. 363-373 ◽  
Author(s):  
Alexander Genbach ◽  
Nellya Jamankulova ◽  
Vukman Bakic
Keyword(s):  
Temperature Difference ◽  
High Speed ◽  
Power Plants ◽  
Cooling System ◽  
Thermal Power ◽  
Laser System ◽  
Operating Conditions ◽  
Design Parameters ◽  
Porous Structures ◽  
The Impact

The processes of vaporization in porous structures, working with the excess of liquid are investigated. With regard to the thermal power plants new porous cooling system is proposed and investigated, in which the supply of coolant is conducted by the combined action of gravity and capillary forces. The cooling surface is made of stainless steel, brass, copper, bronze, nickel, alundum and glass, with wall thickness of (0.05-2)?10-3 m. Visualizations of the processes of vaporization were carried out using holographic interferometry with the laser system and high speed camera. The operating conditions of the experiments were: water pressures (0.01-10) MPa, the temperature difference of sub-cooling (0-20)?C, an excess of liquid (1-14) of the steam flow, the heat load (1-60)?104 W/m2, the temperature difference (1-60)?C and orientation of the system (? 0 - ? 90) degrees. Studies have revealed three areas of liquid vaporization process (transitional, developed and crisis). The impact of operating and design parameters on the integrated and thermal hydraulic characteristics was defined. The optimum (minimum) flow rate of cooling fluid and the most effective type of mesh porous structure were also defined.

Simulation and Analysis for Cooling System of High-Speed Motorized Spindle

2014 ◽  
Vol 945-949 ◽  
pp. 1677-1680
Author(s):  
Chun Li Lei ◽  
Zhi Yuan Rui ◽  
Yin Cheng Zhou
Keyword(s):  
High Speed ◽  
Cooling System ◽  
Water Channel ◽  
Cooling Effect ◽  
Water Cooling ◽  
Motorized Spindle ◽  
Heat Transfer Theory ◽  
Nc Machine ◽  
Manufacturing Accuracy ◽  
Water Cooling System

In order to improve the manufacturing accuracy of NC machine tool, it is crucial to reducing the temperature rise of high-speed motorized spindle. The cooling effect and temperature distribution of water-cooling system are simulated and analyzed based on thermodynamics, heat transfer theory and computational fluid dynamics in this paper. The results show that the cooling system has fine cooling effect; the temperature of cooling liquid is changed from low to high and then to decrease, the highest temperature is at the roundabout of helical water channel and the reason for this phenomenon is found out. The results provide the theory basis for the structure optimization for water-cooling system.

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