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... Assurances Against Deception, Singapore School "Leakage", Tests On Velocity Of Light U.S. Confirmation Of Einstein Theory, ... Power Again Plan For 1,326 Front Line Aircraft, Pay Settlement Rejected By Miners Objection To Conditions: ...
1958 - Gale Group | TDA
In the development of high-speed aircraft, rockets, missles, etc., wind-tunnel pressure measurements at supersonic velocities are necessary to determine certain aerodynamic characteristics. Because of the lack of knowledge concerning the proper choice of parameters in ...
Tópico(s): Aerodynamics and Fluid Dynamics Research
1953 - American Institute of Physics | Journal of Applied Physics
When an aircraft changes its speed or altitude, large thermal strains may be set up in the wing structure; sometimes these are of sufficient magnitude for the accompanying stresses to exceed the clastic limit of the material. During its life the aircraft may suffer a large number of cycles of thermal stress. Under repeated thermal loading it is found that four types of stress‐strain system may be set up: permanent elasticity and shakedown to an clastic state, which are safe, and alternate plasticity ...
Tópico(s):
1954 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
Lijing Wen, Chunming Zhang, Chao Guo, Liansheng Zhang, Zhuo-Cheng Ou, Zhuoping Duan,
... a movable steel-reinforced concrete target via a rocket sled loading test platform. Three impact tests with different sizes of the aircraft models were carried out. In all the tests, the flying attitude and velocity of the aircraft models were recorded by a high-speed photography system. The acceleration and velocity time ...
Tópico(s): Fatigue and fracture mechanics
2018 - Elsevier BV | International Journal of Impact Engineering
Enling Tang, Yue Li, Ruizhi Wang, Yafei Han, Liping He, Shuhua Liu, Meng Wang, Shenghai Xiang, Zhenbo Li,
To introduce the application background the selfpowered technology for Fuze bridge fire, high overload microthermal battery activation, rocket ignition, and the aircraft escape actual condition lifesaving system ignition power supply, which intends to use the high-speed impact of piezoelectric ceramic in the process of missile launching high overload pressure or missile and target intersection in the process of high overload stress wave of piezoelectric ceramics and the transformation of power, ...
Tópico(s):
2018 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Plasma Science
Shilpa Walia, Vikrant Satya, Sandeep Malik, Subhash Chander, Sonu Devi, Annu Sharma,
... that it can carry the test articles like aircrafts, payloads, warheads, missiles and many other ballistic systems to achieve high velocities ranging from subsonic to hypersonic by accelerating these sleds using solid rocket motors over the rail track. Such facilities provide ...
Tópico(s): Electromagnetic Launch and Propulsion Technology
2022 - Defence Scientific Information and Documentation Centre | Defence Science Journal
Produção Nacional
Carlos Antônio Reis Pereira Baptista, Miguel Justino Ribeiro Barboza, A.M.L. Adib, Margareth Spangler Andrade, C. Otani, Danieli Aparecida Pereira Reis,
During service operation, the pneumatic system of a commercial aircraft is subjected to hot air pressure cycles, causing the stresses developed in the material to be of cyclic nature. Commercially pure titanium is one of the various metallic materials selected for use in the pneumatic system components. In order to provide information concerned with the service performance of the titanium ducts and their effects on material behavior, it was developed a pneumatic workbench capable of reproducing ...
Tópico(s): Advanced materials and composites
2008 - Elsevier BV | Materials & Design (1980-2015)
Eugene F. Brown, G. L. Hamilton,
accurate prediction of the range, payload, and operational economy of conventional, V/STOL, and supersonic jet aircraft, accurate knowledge of the velocity and discharge coefficients of the exhaust nozzle and the variation of these coefficients with nozzle pressure ratio is required. The need for high accuracy has become increasingly important because of the higher gross-to-net thrust ratios of today's high-bypass ratio turbofan engines and tomorrow's advanced supersonic jet engines. These high ...
Tópico(s):
1976 - American Institute of Aeronautics and Astronautics | Journal of Aircraft
Muzaffer Yener, E. R. Wolcott,
... established. Because of their light weight, high modulus, high strength, and good fatigue resistance, carbon fiber composites have been used successfully in the aircraft industry and rocket motor cases. However, composite materials are very susceptible to low velocity and low energy impact damage. Recently, the damage ...
Tópico(s): Transportation Safety and Impact Analysis
1989 - ASM International | Journal of Pressure Vessel Technology
Z.R. Li, Z.C. Li, Z.F. Dong, Tao Huang, Yonggang Lu, Jili Rong, Hao Wu,
Investigations of large commercial aircraft impact effect on nuclear power plant (NPP) buildings have been drawing extensive attentions, particularly after the 9/11 event, and this paper aims to numerically assess the damage and vibrations of NPP buildings subjected to aircrafts crash. In Part I of present paper, two shots of reduce-scaled model test of aircraft impact on NPP were conducted based on the large rocket sled loading test platform. In the present part, the numerical simulations of both ...
Tópico(s): Fire effects on concrete materials
2021 - Elsevier BV | Nuclear Engineering and Technology
... provide signie cant performance improvements over traditional solid rocket motors utilizing similar guidance laws in high off-boresight launch conditions. A problem associatedwiththeseoptimalguidancelawsisthattheyrequiremissile-to-targetposition,velocity,andacceleration. For practical missile applications, only the initial values of relative position and velocity and an initial guess of the target’ s acceleration would be available from the launching aircraft. To further complicate the situation, most short-range ...
Tópico(s): Electromagnetic Launch and Propulsion Technology
1998 - American Institute of Aeronautics and Astronautics | Journal of Guidance Control and Dynamics
C. Wang, J. Hu, Fuzhu Wang, Jing Jiang, Z. Z. Zhang, Yongmei Yang, Jiexiong Ding, Hongchuan Jiang, Y. M. Wang, Wei Hou,
Fires resulting from titanium combustion are complex and violent processes which can instantly burn a titanium alloy once ignited. The occurrence of titanium combustion is a disaster for aircraft. Accurate measurement of the ignition temperature of titanium alloys is of significance in preventing such fires and in investigating combustion-resistance properties. In this study, monochromatic temperature and emissivity measurement methods based on reflectivity detection were used to determine the ignition ...
Tópico(s):
2018 - American Institute of Physics | Review of Scientific Instruments
This paper presents a preliminary analysis of the effects of kinetic healing at supersonic speeds on the torsional and flexural stiffnesses of thin solid wings. The main investigation is based on the small deflexion theory, but the scope of the analysis for torsion is extended to cover the effects of large deformations.
Tópico(s):
1957 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
Peize Yan, Zhang Lishuang, Wenjie Wang, Yi Jiang, Pengyu Pu,
... in the ground test which may cause the aircraft to overturn or even get out of its rail. Severe aerodynamic noise may damage the precise instruments during high-speed rocket sleds experiments. In order to instruct the design of aeroacoustics protection, numerical simulations are conducted based on computational fluid dynamics and computational acoustics. The distribution of velocity and pressure has been analyzed. Diagram of sound ...
Tópico(s): Combustion and flame dynamics
2021 - Elsevier BV | Applied Acoustics
E. Deletombe, Jacky Fabis, Jacques Dupas, J.M. Mortier,
The design of fuel tanks with a reduced vulnerability with respect to hydrodynamic ram pressure (HRAM) effects is of an increasing need in the Civil (e.g. the Concorde accident), and Defence (military aircraft, unmanned vehicle systems) aircraft industries. The presented work concerns experimental research which aims at observing two hydraulic ram events – both induced by a 7.62 mm bullet shot in very different containers – throughout their various steps until the final collapse of the generated cavity, ...
Tópico(s):
2012 - Elsevier BV | Journal of Fluids and Structures
JET aircraft and missiles are now flying at velocities high enough in the supersonic regime to experience an excessive rise in surface temperature due to the conversion of some of the kinetic energy of the vehicle into heat by compression and friction in the boundary layer. To prevent this thermal barrier from setting an upper limit on plane and missile performance, it is necessary to be able to predict this temperature rise for a particular design configuration in order that structural failure, ...
Tópico(s):
1955 - American Institute of Aeronautics and Astronautics | Jet propulsion
Semih Ölçmen, Gary C. Cheng, Richard Branam, Stanley E. Jones,
Understanding the performance of penetrators and aerodynamic bodies of revolution (missiles, rockets, aircraft noses, etc.) requires a close look at the drag and the heat transfer characteristics at a wide range of supersonic flight conditions. This research utilizes computational study and compares the aerothermal loads of supersonic flows around a new penetrator geometry, derived based on the optimization of the nose factor, to those of other common projectile shapes: conical, tangent-ogive, and ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
2018 - SAGE Publishing | Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science
Rockets, aircraft and other vehicles experience random vibrations. Although random vibration test facilities have become widely available they have not totally superseded sine wave vibration tests, which continue to be specified. This is because sine tests retain diagnostic advantages, although they are likely to overtest some elements of an equipment, and to lead to unrepresentative patterns of damage. The paper discusses formulae for the level and duration of a sine wave test and how the uncertainties ...
Tópico(s):
1967 - Elsevier BV | Journal of Sound and Vibration
BISPLINGHOFF has given a comparative graph showing the relative importance of the parameters of design at various Mach numbers. At Mach numbers above five, i.e. in the range of missile flight, creep becomes the critical design factor. Even though the time of flight of the missile is very short, and not enough to cause any considerable amount of creep, the deflexions caused will be enough to disturb the stability of compression members. Also the aerodynamic shape can be distorted with serious effects ...
Tópico(s):
1957 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
Ahmad Humaizi Hilmi, Nor Azmaliana Azmi, Ariffin Ismail,
Large die hydraulic press forces are one of the key instruments in making jumbo planes. The machine can produce aircraft components such as wing spars, landing gear supports and armor plates. Superpower nations such as USA, Russia, Germany, Japan, Korea and China have large die hydraulic press which can press 50,000 tons. In Malaysia, heavy-duty press is available from companies such as Proton that builds chassis for cars. However, that heavy-duty press is not able to produce better bulkhead for ...
Tópico(s):
2017 - American Institute of Physics | AIP conference proceedings
Jelena Svorcan, Sakib Hasan, Marija Baltić, Aleksandar Simonović,
The main roles of unmanned air vehicles (UAVs) include: observation, surveillance, transportation, remote sensing and various security tasks. Improved, augmented type of UAVs are high-altitude long-endurance (HALE) aircraft capable and designed, as their name suggests, for lengthy flights at higher altitudes (which also usually implies subsonic cruising velocities). Different variants, in both size and applied technical solutions, have been tried. Common approach incorporates standard wing-fuselage- ...
Tópico(s): Aerospace Engineering and Control Systems
2019 - Faculty of Agronomy in Čačak | Scientific Technical Review
S the advent of high speed aircraft and missiles, the damage to radomes and other parts from rain has become a problem requiring understanding and solution. Anticipating that this problem would become more important with increases in flight velocity, the materials laboratory of WADC sponsored a study of rain erosion testing techniques. One part of this study was undertaken by the Convair thermodynamics laboratories in 1952 and has continued since that time. A small group of engineers, under the ...
Tópico(s):
1957 - American Institute of Aeronautics and Astronautics | Jet propulsion
Xiaopeng Chen, Huanwen Guan, Congshan Zhuo, Wenchun Feng, Chengwen Zhong,
In most of the emergency circumstances, the aircrew leaves the aircraft under unsatisfied conditions, such as too high relative velocity to the ambient air or low partial oxygen pressure. The aircrew must pass through this area as quickly as possible before opening the parachute safely, viz., free-fall. Numerical simulations are conducted in this paper to explore the major characteristics of the aircrew free-fall process by using a commercial computational fluid dynamic (CFD) software, FLUENT. Coupled ...
Tópico(s): Experimental and Theoretical Physics Studies
2011 - Elsevier BV | Chinese Journal of Aeronautics
... that a rocket launched at high altitude and high initial velocity does not need expensive thermal protection to survive ascent. Delivery of munitions to target by DLSRRs should be much less expensive than delivery by a conventional rocket. Even though delivery of munitions by bomber aircraft is even less expensive, a bomber needs to ...
Tópico(s): Guidance and Control Systems
2020 - Multidisciplinary Digital Publishing Institute | Aerospace
Emanuele Vincenzo Arcieri, Sergio Baragetti,
AA7075-T6 is widely used in the aviation and aerospace industries thanks to its interesting strength-to-weight ratio. The fatigue life of the structural components of aircrafts and rockets can be altered as a consequence of the impact of alien objects. This work investigates the fatigue behavior of an AA7075-T6 hourglass specimen induced by the impact of a steel ball at its minimum cross-section. The specimen is then tested with a rotating bending moment. The stress distributions after impact and ...
Tópico(s): Metal Forming Simulation Techniques
2021 - World Scientific | Journal of Multiscale Modelling
Travis A. Wyen, Joshua J. Schoettelkotte, Ricardo Pérez, Thomas Eason,
Hypersonic aircraft structures must operate in complex loading conditions and very high temperatures, making the design of a robust and reusable platform very challenging. An analytical and experimental test program was developed by the Air Force Research Laboratory (AFRL) and industry. The objective of the program is to review the design process of a thin skinned aircraft panel subjected to combined thermal-acoustic-mechanical loading, through a series of laboratory experiments at the AFRL’s Structural ...
Tópico(s): Structural Response to Dynamic Loads
2017 - Springer Nature | Conference proceedings of the Society for Experimental Mechanics
Howard J. Fleisher, Haym Benaroya,
In 1971, the U.S. Army first supported the development of computer code KRASH to model the impact dynamics and mechanics of airframes. The Federal Aviation Administration continued this support in 1975. Many enhancements have been added to the initial code, and the current official release version is KRASH 85. The next step in the ongoing advancement of KRASH includes uncertainties in modeling capabilities, which is the contribution of this work. In particular, a Monte Carlo simulation framework ...
Tópico(s):
1994 - American Institute of Aeronautics and Astronautics | Journal of Aircraft
Purpose This study aims to determine the relationship between sectional geometric parameters of a slotted solid rocket propellant on structural integrity and internal ballistic performance of a rocket motor by using response surface method. Design/methodology/approach Zero-dimensional (0D) ballistic solver is developed and validated to determine the effects of sectional geometric parameters on internal ballistic performance of a rocket motor. Additionally, effects of these parameters on structural ...
Tópico(s):
2018 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
... for combustion, relative independence of altitude and flight velocity upon thrust, small frontal area for high thrusts, simple construction and low weight, and high rate of fuel consumption. Its use was greatly developed during the war years and many applications are now familiar to all. Most of the work on rocket missiles, such as the anti‐aircraft barrages, fighter armament, etc., was performed with solid ...
Tópico(s):
1947 - Emerald Publishing Limited | Aircraft Engineering and Aerospace Technology
The conditions of flight environment for hypersonic aircrafts are all airspace and large velocity field. It is necessary to develop an environment prediction and verification method with high precision that comprehensively considers various physical effects under real flight conditions as ground design is difficult to fully simulate the high-altitude environment and flight conditions.
Tópico(s): Space Satellite Systems and Control
2021 - Springer International Publishing | Springer aerospace technology