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Theoretical research on the motion of spherical bubbles with surface tension
The Rayleigh-Plesset equation is the fundamental model of bubble dynamics and is widely used in the study of cavitation mechanisms. Since cavitation...
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Sundman-Transformed Differential Dynamic Programming with Modified Equinoctial Elements
Previous efforts addressed the challenge of low-thrust many-revolution trajectory optimization by applying a Sundman transformation to change the...
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A Time Regularization Scheme for Spacecraft Trajectories Subject to Multi-Body Gravity
A time regularization scheme is introduced that facilitates trajectory optimization in multi-body regimes. The time transformation function allows...
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A SECOND ORDER RELATIVE MOTION MODEL FOR GATEWAY
Current Gateway rendezvous, proximity operations, and docking plans are limited to segments of the Gateway orbit far from the moon due to highly...
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Low-Thrust Many-Revolution Trajectory Optimization via Differential Dynamic Programming and a Sundman Transformation
Low-thrust trajectories about planetary bodies characteristically span a high count of orbital revolutions. Directing the thrust vector over many...
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INDIRECT BASED SHADOW MODELLING WITH WARM-UP TIME FOR PERTURBED ORBIT
Low thrust solar powered missions are challenging for their requirement of long duration missions with extended periods of thrusting. The complexity...
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Variant selection map of external load during Ni4Ti3 precipitation in nitinol: a theoretical and phase field study
The morphology of Ni 4 Ti 3 precipitates is important in tuning the martensitic transformation (MT) behavior and mechanical properties of nitinol....
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An Interpolated Second-Order Relative Motion Model for Gateway
Understanding of relative motion dynamics is essential for many spaceflight objectives, from orbit determination to rendezvous. Although these...
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Phase equilibria of Fe3O4–Cr2O3–CaO system: experimental measurements and thermodynamic calculations
Understanding the phase equilibria of the Fe 3 O 4 –Cr 2 O 3 –CaO system is essential for the efficient recycling of stainless steel pickling sludge. The...
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Direct-to-indirect map** for optimal low-thrust trajectories
Optimal, many-revolution spacecraft trajectories are challenging to solve. A connection is made for a class of models between optimal direct and...
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Costate map** for indirect trajectory optimization
Numerical solutions of optimal control problems are influenced by the appropriate choice of coordinates. The proposed method based on the variational...
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Integrable modulation, curl forces and parametric Kapitza equation with trap** and esca**
In this present communication, the integrable modulation problem has been applied to study parametric extension of the Kapitza rotating shaft...
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An artificial neural network model for the unary description of pure substances and its application on the thermodynamic modelling of pure iron
The aim of this work is to introduce a novel approach for the universal description of the thermodynamic functions of pure substances on the basis of...
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Two-Body Orbital Boundary Value Problems in Regularized Coordinates
Lambert’s two-body orbital boundary value problem (BVP) is the determination of the terminal velocity vectors of a trajectory connecting two fixed...
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Sun Gravity-Assist to Trans-Lunar Injection Orbits
Solar gravity propelled highly elliptical resident Earth orbits have been utilized to improve lunar mission performance. A regularized orbit...
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Efficient optimization method for variable-specific-impulse low-thrust trajectories with shutdown constraint
This paper develops a sequential convex programming (SCP)-based method to solve the minimum-fuel variable-specific-impulse low-thrust transfer...
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Regularized luni-solar gravity dynamics on resident space objects
Resident space object population in highly elliptical high perigee altitude (> 600 km) orbits is significantly affected by luni-solar gravity. Using...
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Ageing Behaviour of Sc-Doped Cu–Zn–Al Shape Memory Alloys
The effect of scandium (Sc), when added in trace, on the ageing behaviour of Cu–Zn–Al shape memory alloy was investigated in the present work....
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Density and thermal expansion coefficients of liquid and austenite phase in lamellar cast iron
Volume change related defects formation mechanisms are an important detracting phenomenon in production of complex shaped cast components. Among...