Drag torque in high Tc superconducting magnetic bearings with multi-piece superconductors in low speed high load applications

2001 ◽  
Vol 11 (1) ◽  
pp. 1661-1664
Author(s):  
H. Ye ◽  
Y. Postrekhin ◽  
Ki Bui Ma ◽  
Wei-Kan Chu
Keyword(s):  
High Load ◽  
Magnetic Bearings ◽  
Drag Torque ◽  
High Tc ◽  
Low Speed

Magnetic bearings using high Tc superconductorsconfigurations and first results

Cryogenics ◽  
1994 ◽  
Vol 34 ◽  
pp. 843-846 ◽  
Author(s):  
P. Hiebel ◽  
P. Tixador ◽  
Y. Brunet
Keyword(s):  
Magnetic Bearings ◽  
High Tc ◽  
First Results

scholarly journals Effects of multiple injections on combustion and emissions in a heavy-duty diesel engine at high load and low speed

2020 ◽  
Vol 12 (12) ◽  
pp. 168781402098462
Author(s):  
Yingying Lu ◽  
Yize Liu
Keyword(s):  
Diesel Engine ◽  
Single Injection ◽  
High Load ◽  
Post Injection ◽  
Heavy Duty ◽  
Low Speed ◽  
Multiple Injections ◽  
Heavy Duty Diesel Engine ◽  
Main Injection ◽  
Heavy Duty Diesel

Advanced multiple injection strategies have been suggested for compression ignition engines in order to meet the increasingly stringent emission regulations. Experiments and simulations were used to study effects of the main-injection mode (times), the post-injection proportion, and timing on combustion and emissions in a heavy-duty diesel engine at high load and constant low speed. The results reveal the following. The NOx emissions of 1main+1post, 2main+1post, and 3main+1post injections are all lower than those of single injection; the higher the number of main-injection pluses, the lower the NOx emissions. Enough main-post injection interval is needed to ensure post and main injections are relatively independent to entrain more fresh air to decrease the soot. Over-retarded post-injection timing tends to increase the soot due to the lower in-cylinder temperature. The combined effects of formation and oxidation determine the final soot. To gain the best trade-off of NOx and soot, compared with single injection, for the three multiple injections, the lowest soot emissions are gained at post-injection proportions of 15% and post-injection timings of 25°, 30°, and 35° CA ATDC, with soot reductions of 26.7%, −34.5%, and −112.8%, and NOx reductions of 5.88%, 21.2%, and 40.3%, respectively, for 1main+1post, 2main+1post, and 3main+1post injections.

High-Load and Low-Speed Sliding Behavior of Marginally Lubricated Metal Surfaces

1986 ◽  
Vol 29 (1) ◽  
pp. 1-12
Author(s):  
Sidney A. Karpe ◽  
Nannaji Saka
Keyword(s):  
Metal Surfaces ◽  
High Load ◽  
Low Speed

Fundamental study on high Tc superconducting magnetic bearings for flywheel system

1995 ◽  
Vol 5 (2) ◽  
pp. 643-649 ◽  
Author(s):  
S. Nagaya ◽  
N. Hirano ◽  
M. Takenaka ◽  
M. Minami ◽  
H. Kawashima
Keyword(s):  
Magnetic Bearings ◽  
Fundamental Study ◽  
High Tc

Drag torque of high Tc superconductor magnet bearings with multi-piece ring magnets or superconductors

2000 ◽  
Vol 341-348 ◽  
pp. 2615-2616 ◽  
Author(s):  
E. Postrekhin ◽  
Hong Ye ◽  
Ma Ki Bui ◽  
Chu Wei-Kan
Keyword(s):  
Drag Torque ◽  
High Tc ◽  
High Tc Superconductor

Predictive Indoor Wheel Testing of Heavy Duty Truck Tires

1987 ◽  
Vol 15 (1) ◽  
pp. 58-67
Author(s):  
R. L. Keefe
Keyword(s):  
Load Transfer ◽  
High Stress ◽  
High Load ◽  
Heavy Duty ◽  
Low Speed ◽  
Service Failures ◽  
Heavy Duty Truck ◽  
Truck Tire ◽  
Truck Tires ◽  
Load Tests

Abstract An indoor wheel test for heavy duty truck tires has been developed to predict in-service failures of commercial and developmental tires. The test, run at slow speed and high load to emphasize stress and fatigue rather than heat, is based on the premise that repeated high stress is the principal cause of in-service tire failure. These stresses occur when dynamic or transient overloads are caused by road bumps, load transfer during braking and cornering, or dual tire configuration on non-uniform surfaces. Although these overloads may occur infrequently, they can become very significant in the long distances run by truck tires. Other current heavy duty truck tire tests are generally run at higher speeds, emphasizing heat resistance of rubber compounds, or else are low-speed, much-overloaded bead tests which are unrealistically severe. Since its development in 1974 the present test has been broadly predictive for many belt, carcass, or fatigue related in-service failures of both bias and radial commercial and developmental truck tires. The test is called “The DuPont High Load Wheel Test” to distinguish it from other low-speed-high-load tests.

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