Energy Deposition to Efficiently Reduce Sonic Boom and Drag, and Increase Control Authority in High-Speed Applications

2017 ◽  
Author(s):  
Kevin P. Kremeyer ◽  
Pascal Mickelson ◽  
Enrique Montano
Keyword(s):  
High Speed ◽  
Energy Deposition ◽  
Sonic Boom ◽  
Control Authority

Optimization procedure for reduced sonic boom in high speed flight

1995 ◽  
Author(s):  
A Chattopadhyay ◽  
J Narayan ◽  
N Pagaldipti ◽  
X Wensheng ◽  
S Cheung
Keyword(s):  
High Speed ◽  
Optimization Procedure ◽  
Sonic Boom

Exploring research on high-speed vehicle attitude control with plasma virtual flap manipulation

2018 ◽  
Vol 233 (10) ◽  
pp. 3627-3634
Author(s):  
Wang Xin ◽  
Yan Jie ◽  
Zhang Yerong
Keyword(s):  
Attitude Control ◽  
High Speed ◽  
Long Duration ◽  
Aerodynamic Control ◽  
Control Authority ◽  
Attitude Controller ◽  
Lift And Drag ◽  
Cruise Flight ◽  
Aerodynamic Lift ◽  
High Speed Vehicle

This work provides an attitude solution for a high-speed vehicle using plasma aerodynamic control called “plasma virtual flap” manipulation. This paper describes the concept of using plasma active control as plasma virtual flap for off-design attitude manipulation problem. Design of an attitude controller considering plasma aerodynamic effects for the high-speed vehicle is presented. The aerodynamic lift and drag force features in the high speed, long duration cruise flight with plasma actuator effect are introduced, where the estimated models and attitude controller are established. This paper documents the development and capabilities of plasma virtual flap attitude control authority. Simulation results are presented to exhibit the effectiveness of the proposed method.

Anwendungszentrum für additive Fertigung/Center for Applied Additive Manufacturing – Influence of process parameters during high-speed laser direct energy deposition

2021 ◽  
Vol 111 (06) ◽  
pp. 368-371
Author(s):  
Sebastian Greco ◽  
Marc Schmidt ◽  
Benjamin Kirsch ◽  
Jan C. Aurich
Keyword(s):  
Additive Manufacturing ◽  
High Speed ◽  
Energy Deposition ◽  
Influence Of Process Parameters ◽  
Direct Energy Deposition ◽  
Additive Fertigung ◽  
Powder Bed ◽  
High Productivity ◽  
Direct Energy ◽  
Near Net Shape

Additive Fertigungsverfahren zeichnen sich durch die Möglichkeit der endkonturnahen Fertigung komplexer Geometrien aus. Die geringe Produktivität etablierter Verfahren wie etwa dem Pulverbettverfahren hemmen aktuell den wirtschaftlichen Einsatz additiver Fertigung. Das Hochgeschwindigkeits-Laserauftragschweißen (HLA) soll durch deutlich erhöhte Auftragsraten und somit bisher unerreicht hoher Produktivität bei der additiven Fertigung dazu beitragen, deren Wirtschaftlichkeit zu steigern.   Additive manufacturing enables the near-net-shape production of complex geometries. The low productivity of established processes such as powder bed processes is currently limiting the economic use of additive manufacturing. High-speed laser direct energy deposition (HS LDED) is expected to improve the economic efficiency of additive manufacturing by significantly increasing deposition rates and thus previously unattained high productivity.

PREDICTION AND VALIDATION ON THE SONIC BOOM BY A HIGH-SPEED TRAIN ENTERING A TUNNEL

2001 ◽  
Vol 247 (2) ◽  
pp. 195-211 ◽  
Author(s):  
T.S. YOON ◽  
S. LEE ◽  
J.H. HWANG ◽  
D.H. LEE
Keyword(s):  
High Speed ◽  
Sonic Boom ◽  
High Speed Train

Clarification of Wire Heating Process in Pulsed Wire Discharge with High-Speed Gas Puff

2006 ◽  
Vol 510-511 ◽  
pp. 1010-1013
Author(s):  
Y. Tokoi ◽  
Tadachika Nakayama ◽  
Hisayuki Suematsu ◽  
Wei Hua Jiang ◽  
K. Yatsui ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Energy Deposition ◽  
Peak Pressure ◽  
Copper Wire ◽  
Acrylic Resin ◽  
Bottom Plate ◽  
Heating Process ◽  
Nanosized Powders ◽  
Pulsed Wire Discharge

Copper nanosized powders were prepared by pulsed wire discharge (PWD) in N2 gas at low pressure (130 Pa) with high-speed gas puff. The pressure around one of the electrodes was changed to investigate the effect of electrical discharge prevention by gas puff. The peak pressure was changed from 22 kPa to 10 kPa in the gas puff apparatus by changing the distance from an acrylic resin tube and a bottom plate. The energy deposition in the copper wire at 22, 15 and 10 kPa was about 40, 37 and 33 J, respectively. The energy deposition in the wire increased with the increase in pressure around the electrode.

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