Journal of Aerospace Engineering

LunarVader: Development and Testing of a Lunar Drill in a Vacuum Chamber and in the Lunar Analog Site of the Antarctica

K. Zacny, G. Paulsen, M. Szczesiak, J. Craft, P. Chu et al.
Future exploration of the Moon will require access to the subsurface and acquisition of samples for scientific analysis and groundtruthing of water-ice and mineral reserves for In Situ Resource Utilization (ISRU) purposes. The LunarVader drill described in this paper is a one meter class drill and c ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000212] posted Sat Feb 11, 2012.

Experimental Slender Wing Model Design by the Application of Aeroelastic Scaling Laws

E. Cestino, G. Frulla, E. Perotto, and P. Marzocca
Long endurance Unmanned Air Vehicles usually employ high aspect ratio flexible wings to reduce weight and power required to achieve extended flight operation. There are currently several advanced concept designs and prototypes that will sustain autonomous operations for months or even years. The inc ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000211] posted Sat Feb 11, 2012.

Fuzzy-Genetic Autopilot Design for Nonminimum Phase and Nonlinear Unmanned Aerial Vehicles

Ali Reza Babaei, Mahdi Mortazavi, and Mohammad Hassan Moradi
In this paper, the authors tried to design the altitude hold mode autopilot for unmanned aerial vehicles. This case presents an interesting challenge attributable to the nonminimum phase characteristic, nonlinearities, and uncertainties of the altitude to elevator relationship. A fuzzy logic autopil ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000116] published Thu Feb 9, 2012.

Performance Diagnosis for Turbojet Engines Based on Flight Data

Ray C. Chang
The purpose of the present study is to improve the flight data analysis in the existing program of Flight Operations Quality Assurance (FOQA) of the airlines. The goal is to detect any potential problems related to the engine health. The exhaust gas temperature (EGT) is the primary parameter in perf ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000210] posted Mon Feb 6, 2012.

Study on Ultimate Anti-Seismic Capacity of High Arch Dam

Heng Cheng and Liaojun Zhang
A 3D numerical simulation model for failure process caused by earthquake is established based on the Shapai high RCC arch dam in Wenchuan earthquake region. Several comprehensive influencing factors, including nonlinear behavior of concrete, infinite foundation radiation damping, dam-reservoir dynam ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000209] posted Mon Feb 6, 2012.

Progress Made in Lunar In-Situ Resource Utilization under NASA's Exploration Technology and Development Program

Gerald B. Sanders and William E. Larson
Incorporation of In-Situ Resource Utilization (ISRU) and the production of mission critical consumables for propulsion, power, and life support into mission architectures can greatly reduce the mass, cost, and risk of missions leading to a sustainable and affordable approach to human exploration bey ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000208] posted Sat Jan 14, 2012.

ALSs with Conventional and Fuzzy Controllers Considering Wind Shears and Gyro Errors

Romulus Lungu, Mihai Lungu, and Lucian T. Grigorie
The paper presents the automatic control of the aircrafts in the longitudinal plane during the landing process, taking into account the wind shears and sensor errors. Two automatic landing systems (ALS) are designed: the former uses an Instrumental Landing System (ILS), while the latter controls the ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000207] posted Sat Jan 14, 2012.

A Hierarchical Model-Based Approach to Testability Modeling and Analysis for PHM of Aerospace Systems

Shu-ming Yang, Jing Qiu, Guan-jun Liu, and Peng Yang
Prognostics and health management (PHM) technique has been developed and applied for a variety of safety-critical aerospace systems. The PHM performance highly relies on the test data which conveys the system health relevant information, and design for testability (DFT) developed concurrently with s ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000203] posted Wed Jan 11, 2012.

Friction Compensation Control of Gas Flow Regulation for Ducted Rockets Based on Adaptive Dither Method

Juntao Chang, Bin Li, Wen Bao, Wenyu Niu, and Daren Yu
In this paper, the friction generated in gas flow regulation of ducted rockets is considered and a compensation method is discussed to eliminate its effect. Firstly the dynamic mathematic model of gas flow regulating system considering friction is established and analyzed. Then the mechanism of fric ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000202] posted Wed Jan 11, 2012.

Multiscale Performance Characterization of Concrete Formed by Controlled Permeability Formwork Liner

Zhenghong Tian and Pizhong Qiao
It is well known that the permeation and retention of water with controlled permeability formwork (CPF) liner directly contribute to discharging superfluous water and minimizing bubbles content when fresh concrete is poured and cured. These phenomena considerably improve the properties of concrete. ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000199] posted Wed Jan 11, 2012.

Treatment for Expansive Soil Channel Slope with Soilbags

Sihong Liu, Fuqing Bai, Yisen Wang, Shan Wang, and Zhuo Li
Expansive soil is regarded as one of trouble soils and difficult to deal with in engineering, as it behaves as strong swelling-shrinkage and has well-developed fissures and over-consolidation. In this paper, a treatment method for an expansive soil channel slope with soilbags is proposed. The mechan ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000198] posted Wed Jan 11, 2012.

Dye Visualization of the Vortical Flow Structure over Double-Delta Wing

Aung Myo Thu, Yung Hwan Byun, and Jae-Woo Lee
The investigation of the flowfield around double-delta wing was carried out in AADL LAB's water tunnel facility. The model has sharp leading edge and 76/40 degrees configuration which is the representative of current fighter aircraft. The experiments were conducted at Reynolds numbers of 10000 and ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000195] posted Sat Dec 17, 2011.

Optimal Guidance Based on Receding Horizon Control and Online Trajectory Optimization

Reza Jamilnia and Abolghasem Naghash
In this paper, a general guidance method based on receding horizon control technique and online trajectory optimization is proposed for various interception problems. In this method, the interception problem is defined as an optimal control problem by full dynamics of interceptor and current positio ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000194] posted Sat Dec 17, 2011.

Adaptive Fuzzy Integral Sliding Mode Control for Flexible Air-Breathing Hypersonic Vehicles Subject to Input Nonlinearity

Xiaoxiang Hu, Ligang Wu, Changhua Hu, and Huijun Gao
This paper proposes a fuzzy integral sliding mode control (FISMC) strategy for flexible air-breathing hypersonic vehicles (FAHVs) with input nonlinearity. Due to the complex nonlinear dynamics in the considered vehicles, a control-oriented model, which can retain the dominant features of the higher- ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000193] posted Thu Dec 15, 2011.

A Constrained Motion Approach to the Synchronization of Multiple Coupled Slave Gyroscopes

Harshavardhan Mylapilli
A set of `n' gyroscopes are coupled together to form a system of `slave' gyroscopes. A simple approach is developed for synchronizing the motion of these slave gyroscopes, whose individual motion may be regular or chaotic, with the motion of an independent `master' gyroscope irrespective of the chao ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000192] posted Thu Dec 15, 2011.

Retrofit Flight Control Using an Adaptive Chebyshev Function Approximator

Sung-Sik Shin, Byoung-Mun Min, and Min-Jea Tahk
In this paper, a novel adaptive control approach, named ACRC (Adaptive Chebyshev Retrofit Control), retrofitting an existing baseline controller with an adaptive Chebyshev function approximator is presented. The approximator is composed of a linear combination of a parameter and a basis function. In ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000191] posted Thu Dec 15, 2011.

Autonomous Hovering Proportional-Integral Sliding Mode Controller Design and Its Flight Test Validation for Small-Scaled Unmanned Helicopter

Chien-Hong Lin and Shau-Shiun Jan
In this paper, a proportional- integral sliding mode control (PISMC) method is presented to achieve the attitude and position control of an unmanned helicopter system for autonomous hovering. The PISMC includes the advantages of both the conventional sliding mode control (SMC) and the integral slidi ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000189] posted Thu Dec 15, 2011.

Wall Heat Transfer Measurements in High-Pressure Combustion Devices

Xiaowei Wang, Yushan Gao, Guobiao Cai, and Hongfa Huo
In order to investigate the wall heat transfer characteristics in a combustion chamber over a broad range of pressure conditions, a method of making a series of wall temperature measurements in a heat sink combustion chamber, and calculating the wall temperature and heat flux from the temperature da ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000188] posted Thu Dec 15, 2011.

Dynamic Response of a Pressurized Frame-Membrane Lunar Structure with Regolith Cover Subjected to Impact Load

Ramesh B. Malla and Thomas Gionet
A three-dimensional frame-membrane structure covered with regolith shielding and internally pressurized has been proposed as a possible lunar habitat. This paper presents results from the static, frequency, and dynamic impact analysis of the structure using nonlinear (large deformation) finite eleme ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000187] posted Wed Dec 14, 2011.

MHD Stagnation Point Flow over a Nonlinearly Stretching/Shrinking Sheet

Khamisah Jafar, Anuar Ishak, and Roslinda Nazar
The steady laminar two-dimensional MHD stagnation-point flow of an incompressible viscous fluid impinging normal to a nonlinearly stretching/shrinking flat sheet in the presence of a non-uniform magnetic field applied in the positive y direction normal to the flat sheet is considered. The governing ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000186] posted Wed Dec 14, 2011.

Unsteady Wake Characteristics of a Flapping Wing through 3D TR-PIV

Saurav Kumar Ghosh, Chandrala Lakshmana Dora, and Debopam Das
Unsteady wake characteristics of a butterfly shaped wing undergoing flapping and feathering motions are studied. Four bar quick return mechanism is used for generating the flapping motion. To achieve considerable feathering motion the leading edge of the wing is fixed to the flapping arm of the mode ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000185] posted Wed Dec 14, 2011.

Extension of the Strain Energy Updating Technique to a Multilayered Shell Model with Adaptive Displacements and Fixed D.O.F.

Ugo Icardi
The strain energy updating technique (SEUPT) by the author is extended to a new zig-zag shell model with a hierarchic piecewise representation of displacements, which can adapt to the variation of solutions across the thickness. This model has the capability of being refined across the thickness wit ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000184] posted Fri Nov 25, 2011.

A Robust Skewness-Kurtosis Descriptor for Damping Calibration from Frequency Response

Vesna Jaksic and Vikram Pakrashi
This paper attempts to define simple, consistent and robust statistical descriptors for the calibration of damping in linear and non-linear systems through frequency response in the presence of variability and uncertainties due to noise and sampling intervals. The work employs the frequency response ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000183] posted Fri Nov 25, 2011.

Conjugate Heat Transfer Analysis for Hypersonic Flow over Finite Thickness Flat Plate

Girish Oppattaiyamath, Nagarjuna Reddy, Satyapramod Jammy, and Vinayak Kulkarni
Implementation of the conjugate heat transfer (CHT) analysis technique for hypersonic applications is the central theme of the present investigations. Understanding the applicability of the assumptions used in heat transfer measurements and wall material based flowfield analysis are the major object ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000182] posted Fri Nov 25, 2011.

Numerical Simulation of Aggregate Shapes of Three-Dimensional Concrete and Its Applications

Chengbin Du, Liguo Sun, Shouyan Jiang, and Zongquan Ying
The plane extended method was used to model aggregate shapes of three-dimensional concrete. In this method, the convexity condition requires that the volume formed by all the extension points and border planes be positive. We adopted a test method that involved summing the aggregate volumes to judge ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000181] posted Fri Nov 25, 2011.

Power Requirements for the Construction and Operation of Lunar Oxygen Plant

H. Kanamori, T. Watanabe, and S. Aoki
Construction works and machineries required to build lunar facilities including an oxygen plant were specified and power requirements for the construction and operation of these facilities were estimated based on a proposed evolutional scenario. Individual components of lunar facilities such as habi ... [J. Aerosp. Eng. doi:10.1061/(ASCE)AS.1943-5525.0000180] posted Fri Nov 25, 2011.