The Air Force Research Laboratory has identified multiple spacecraft formation flying as an enabling technology for several future space missions. A key benefit of formation flying is the ability to reconfigure the spacecraft formation to achieve different mission objectives. In this paper, generation of fuel optimal manoeuvres for spacecraft formation reconfiguration is modelled and analysed a...

The paper proposes a predictive control strategy in discrete time δ-representation in order to reduce the oscillations in the driveline. These oscillations appear in modern diesel engines when a high engine torque is generated at low engine speed. The main object of this paper is to present a model based control concept in δ domain which seems to improve both the control performance and control...

The Lagrange multiplier for the kinetic energy e is shown to be −γcm on a singular arc, where γ (g/J) is derived from engine and driveline characteristics and cm ≈ 1. Using this value as an approximation for constrained arcs as well, the cost function is J(s, x) ≈ −γcme + C(s) that yields the residual cost φ(x) = −γcme. The factor β corresponds to the constant Lagrange multiplier for time and i...

The tethered space robot (TSR) is a new concept of space robot which consists of a robot platform, space tether and operation robot. This paper presents a multi-objective optimal trajectory planning and a coordinated tracking control scheme for TSR based on velocity impulse in the approaching phase. Both total velocity impulse and flight time are included in this optimization. The non-dominated...

Motivated by the requirement for pinpoint landing in futureMarsmissions, we consider the problemofminimumfuel powered terminal descent to a prescribed landing site. The first-order necessary conditions are derived and interpreted for a point-mass model with throttle and thrust angle control and for rigid-bodymodel with throttle and angular velocity control, clarifying the characteristics of the...

The automotive industry has experienced swift development with the rapid growth of economy. increasing number vehicles led to deteriorating road traffic conditions, increased consumption nonrenewable energy, and excessive vehicle emissions. To tackle problems fuel efficiency safety control for platoons, this study suggests a novel leader-follower optimal method platoons improve efficiency. Depe...

With development of fast modern computers, it has become possible to extend model predictive control (MPC) method to automotive engine control systems, which is traditionally applied to plants with dynamics slow enough to allow computations between samples. In this paper MPC based on an adaptive neural network model is attempted for air fuel ratio (AFR), in which the model is adapted on-line to...

Optimal climate policy is studied in a Ramsey growth model. A developing economy weighs global warming less, hence is more likely to exhaust fossil fuel and exacerbate global warming. The optimal carbon tax is higher for a developed economy. We analyze the optimal time of transition from fossil fuel to renewables, amount of fossil fuel to leave in situ, and carbon tax. Subsidizing a backstop wi...