Research of Reentry Corridor and Guidance Technology for Hypersonic Vehicle

2013 ◽  
Vol 823 ◽  
pp. 62-66
Author(s):  
Xin Min Wang ◽  
Peng Zhang ◽  
Cong Chao Yao
Keyword(s):  
Phase Angle ◽  
Angle Of Attack ◽  
Recovery Phase ◽  
Hypersonic Vehicle ◽  
Transition Phase ◽  
Environment Changes

During the time that a hypersonic vehicle experiences the reentry segment, the environment changes dramatically. This paper analyzes all kinds of constraint conditions of the reentry process, then designs the reentry corridor in both the D-V plane and the H-V plane, and analyzes the influence of various factors on the reentry corridor according to that. Based on the constraint conditions, the reentry segment is divided into the initial descent phase, angle of attack recovery phase, overload hold phase and angle of attack transition phase. Meanwhile the rationality of the design is verified by simulation.

Thermal and structural response of aerospike mounted on blunt-nose body

2020 ◽  
pp. 095441002097648
Author(s):  
Zhang ZhunHyok ◽  
Won CholJin ◽  
Ri CholUk ◽  
Kim CholJin ◽  
Kim RyongSop
Keyword(s):  
Aerodynamic Force ◽  
Coupling Effect ◽  
Angle Of Attack ◽  
Structural Response ◽  
Response Characteristic ◽  
Wave Drag ◽  
Hypersonic Vehicle ◽  
Loosely Coupled ◽  
Calculation Results ◽  
Blunt Nose

The inclusion of aerospike on blunt nose body of hypersonic vehicle has been considered to be the simplest and most efficient technique for a concurrent reduction of both aeroheating and wave drag due to hypersonic speed. However, the thermal and mechanical behavior of aerospike structure under the coupling effect of aerodynamic force and aeroheating remains unclear. In this study, the thermal and structural response of aerospike mounted on the blunt nose body of hypersonic vehicle was numerically simulated by applying 3 D fluid-thermal-structural coupling method based on loosely-coupled strategy. In the simulation, the angle-of-attack and the spike’s length and diameter are differently set as α = 0°–10°, L/D = 1–2 and d/D = 0.05–0.15, respectively. Through the parametric study, the following results were obtained. Firstly, the increase of vehicle’s angle-of-attack and spike’s length unfavorably affect the thermal and structural response of aerospike. Secondly, the increase of spike’s diameter can improve its structural response characteristic. Finally, the aerospike with the angle-of-attack of 0° and the length and diameter of L/D = 1 and d/D = 0.15, respectively, is preferred in consideration of the effect of flight angle-of-attack and spike’s geometrical structure on the thermal and structural response of spike and the drag reduction of vehicle. The numerical calculation results provide a technical support for the safe design of aerospike.

scholarly journals Disturbed motion of a hypersonic vehicle in climb

2019 ◽  
Vol 18 (2) ◽  
pp. 7-20 ◽  
Author(s):  
V. L. Balakin ◽  
M. M. Krikunov
Keyword(s):  
Optimal Control ◽  
Aerodynamic Force ◽  
Angle Of Attack ◽  
Hypersonic Vehicle ◽  
Atmospheric Density ◽  
Optimal Angle ◽  
Control Programs ◽  
Target Values ◽  
Standard Values ◽  
Disturbed Motion

Disturbed motion of a hypersonic vehicle in climb is analyzed. Deviations of atmospheric density from standard values and deviations of aerodynamic force coefficients from nominal values are taken as disturbances. Disturbed motion of a hypersonic vehicle with the optimum angle-of-attack schedule and nominal flight characteristics is modeled. Deviations of terminal conditions of disturbed motion from the target values of velocity, altitude and path inclination are determined. Using the method of Pontryagin’s maximum principle the problem of fuel mass minimum consumed in hypersonic acceleration climb is solved for disturbed motion. Optimal angle-of-attack schedules, optimal flight paths and finite values of the hypersonic vehicle’s mass are determined. Comparative analysis of optimal control programs and flight paths obtained for disturbed and undisturbed motion is carried out.

Research on Influence of Aerodynamic Force on the Aerodynamic Heat for the Hypersonic Vehicle

2012 ◽  
Vol 198-199 ◽  
pp. 207-211
Author(s):  
Yu Xiang Zhang ◽  
Jin Biao Xu ◽  
Fu Hou Xu ◽  
Hua Cheng Li
Keyword(s):  
Heat Flux ◽  
Friction Force ◽  
Aerodynamic Force ◽  
Angle Of Attack ◽  
Hypersonic Vehicle ◽  
Aerodynamic Heating ◽  
Thermal Change ◽  
Flux Change ◽  
Good Consistency ◽  
The Relationship

During the flight of the hypersonic Vehicle, the angle of attack will change with the flight attitude. At the same time, the aerodynamic forces from the surface of aircraft will also be changing. The pressure and friction force are the main causes of the aerodynamic heating, so the surface aerodynamic heating will change. By used the method of numerical calculation, the passage studied the influence the change the pressure and friction force on the distribution of heat flux in different angle of attack and the relationship between the change of the force of lift-drag and aerodynamic heating. The research suggested that the distribution of the heat flux had very good consistency with that of pressure and friction. The lift change was the dominant factors influence of pneumatic thermal change; the change of drag force affected only the speed of heat flux change.

scholarly journals Hypersonic Vehicle Thrust Sensitivity to Angle of Attack and Mach Number

2009 ◽  
Author(s):  
Sean Torrez ◽  
James Driscoll ◽  
Derek Dalle ◽  
Michael Bolender ◽  
David Doman
Keyword(s):  
Mach Number ◽  
Angle Of Attack ◽  
Hypersonic Vehicle

scholarly journals Effect of badminton shoe sole on the lunge skill performance: in the viewpoint of coordination

2021 ◽  
Vol 21 (2) ◽  
pp. 119-126
Author(s):  
Guanchun LIU ◽  
Yuqi LI ◽  
Quting HUANG ◽  
Jin ZHOU ◽  
Wing-Kai LAM
Keyword(s):  
High Resolution ◽  
Phase Angle ◽  
Relative Phase ◽  
Recovery Phase ◽  
Movement Coordination ◽  
Ankle Kinematics ◽  
Skill Performance ◽  
Ankle Joints ◽  
Continuous Relative Phase ◽  
Motion Capturing

Badminton lunge requires rapid coordination between the knee and ankle joints and it is accompanied by fast contact between the shoe’s sole and the floor. Phase angle analysis is a protocol with high resolution and relating to the coordination, but how the shoe’s sole would affect the lunge performance was not clear in terms of coordination. Thereby, the aim of this study was to applied phase angle analysis to insight the lunge process, then to disclose the effect of badminton shoe’s sole on the lunge skill performance. Eleven elite badminton players performed five left-forward maximum lunge trials with wearing Rounded Heel Shoe (RHS), Flattened Heel Shoe (FHS), and Standard Heel Shoes (SHS). The motion capturing system was used to measure the knee and ankle kinematics information. The Phase Angle (PA), continuous relative phase (CRP) and variability of continuous relative phase (VCRP) between the knee and ankle joints were then calculated for both forward lunge phase and recovery phase in each of the three shoes. Current findings indicated that players wearing RHS had certain advantages on better movement coordination than other shoes, as indicated by better PA and CRP. The findings of this study would be helpful to understand the coordination of badminton lunges and explain the synergy between the lower extremity ankle and knee joint to minimize the possibility of injury in badminton. Furthermore, the coordination between the knee and ankle joints was greatly affected by the structure of the shoe heel design.

scholarly journals Rapid Altitude Tracking for Air-Breathing Hypersonic Vehicle With Limited Angle of Attack

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 117411-117425 ◽  
Author(s):  
Xiaochuan Ma ◽  
Haoyu Du ◽  
Kang Chen ◽  
Bin Fu ◽  
Jie Yan
Keyword(s):  
Angle Of Attack ◽  
Hypersonic Vehicle ◽  
Air Breathing ◽  
Limited Angle

Re-Increased Male Suicide Rates in the Recovery Phase Following the Great East Japan Earthquake

Crisis ◽  
2020 ◽  
Vol 41 (6) ◽  
pp. 422-428 ◽  
Author(s):  
Masatsugu Orui
Keyword(s):  
Social Connectedness ◽  
Recovery Phase ◽  
Great East Japan Earthquake ◽  
Temporary Housing ◽  
Period Analysis ◽  
Suicide Rates ◽  
Male Suicide ◽  
The Social ◽  
The Difference

Abstract. Background: Monitoring of suicide rates in the recovery phase following a devastating disaster has been limited. Aim: We report on a 7-year follow-up of the suicide rates in the area affected by the Great East Japan Earthquake, which occurred in March 2011. Method: This descriptive study covered the period from March 2009 to February 2018. Period analysis was used to divide the 108-month study period into nine segments, in which suicide rates were compared with national averages using Poisson distribution. Results: Male suicide rates in the affected area from March 2013 to February 2014 increased to a level higher than the national average. After subsequently dropping, the male rates from March 2016 to February 2018 re-increased and showed a greater difference compared with the national averages. The difference became significant in the period from March 2017 to February 2018 ( p = .047). Limitations: Specific reasons for increasing the rates in the recovery phase were not determined. Conclusion: The termination of the provision of free temporary housing might be influential in this context. Provision of temporary housing was terminated from 2016, which increased economic hardship among needy evacuees. Furthermore, disruption of the social connectedness in the temporary housing may have had an influence. Our findings suggest the necessity of suicide rate monitoring even in the recovery phase.

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