Downrange manoeuvre and oscillation suppression of a self-regulating centrifugally deployed flexible heat shield using a controlled reaction wheel

Abstract

Downrange manoeuvre and oscillation suppression of a self-regulating centrifugally deployed flexible heat shield using a controlled reaction wheel. Acta Astronautica.

Deployable self-regulating centrifugally-stiffened decelerator (DESCENT): Design scalability and low altitude drop test

“…For the same reason, a larger heat shield can reach a lower instantaneous deployment angle, leading to a higher aeroelastic oscillation (i.e. oscillation in deployment angle, which is investigated in the previous study [33]), which in turn increases the fluctuation in deceleration.…”

“…Based on the design studies performed previously [32,33], the present work demonstrates the scalability of DESCENT, and thereby the possibility to adapt this design to a wide range of aerospace applications. Feasibility of re-entry vehicles with entry mass scaled from 30 g to 30 tonne is discussed based on the entry trajectory and structural dynamic behaviour predicted by simulation.…”

“…Previous study has demonstrated that a CubeSat sized vehicle can reach near full deployment (forming a blunt cone) throughout the hypersonic and supersonic flight regimes during a re-entry from Low Earth Orbit (LEO) [32], and a downrange manoeuvrability of order 10 2 km is achievable using a commercial reaction wheel [33]. In this section, it is shown that the design can be scaled-up while achieving similar performance using three simple scaling rules:…”

“…A previous study has proposed a new type of deployable heat shield, namely DEployable, Self-regulating, CENTrifugally-stiffened decelerator (DESCENT) [32,33]. Unlike the current solutions that rely on elastic stabilising forces from either solid or gaseous (i.e.…”

Adaptive Configuration Method of Low-Frequency Electromechanical Sampling Information in Building Electrical System

“…Assuming λ i is the pole of the low-frequency oscillation information mode, its relative residue R k can be used as an observable indicator. Calculating |R k | can clarify the change of observable level with the change of different operating modes, and the residue ratio is used as the indicator to weigh the observability of the alternative input signal of the TCSC device [19]. e residue is expressed as…”