A5023064215- Structural Analysis and Optimization
- Advanced Materials and Mechanics
- Dynamics and Control of Mechanical Systems
- Spacecraft Design and Technology
- Cellular and Composite Structures
- Space Satellite Systems and Control
- Modular Robots and Swarm Intelligence
- Advanced Sensor and Energy Harvesting Materials
- Architecture and Computational Design
- Vibration and Dynamic Analysis
- Structural Engineering and Vibration Analysis
- Spacecraft Dynamics and Control
- Piezoelectric Actuators and Control
- Polymer composites and self-healing
- Planetary Science and Exploration
- Vibration Control and Rheological Fluids
- Composite Structure Analysis and Optimization
- Bladed Disk Vibration Dynamics
- Silicone and Siloxane Chemistry
- Aeroelasticity and Vibration Control
- Innovative Energy Harvesting Technologies
- Inertial Sensor and Navigation
- Additive Manufacturing and 3D Printing Technologies
- Aerospace Engineering and Energy Systems
- Mechanical Engineering and Vibrations Research
University of Bristol
2016-2025
Roche (Switzerland)
2025
National Composites Centre
2012-2023
Bucknell University
2021
University of Surrey
2013-2016
University of Cambridge
2005-2014
Max Planck Institute of Quantum Optics
2011-2012
Max Planck Society
2011
De Viersprong
2009-2011
Institute of Bioinformatics and Systems Biology
2009
This paper describes two folded metamaterials based on the Miura-ori fold pattern. The structural mechanics of these are dominated by kinematics folding, which only depends geometry and therefore is scale-independent. First, a shell structure introduced, where pattern provides negative Poisson's ratio for in-plane deformations positive out-of-plane bending. Second, cellular metamaterial described stacking individual layers, folding compatible between layers. Additional freedom in design can...
Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.
Nanometre-scale metal tips irradiated by femtosecond laser pulses represent ultrafast electron sources. The combination of the pulse and tip offers possibility extending attosecond science from atomic or molecular gases to surfaces solid nanoemitters. We first review this emerging research field focusing on rescattering at sharp tips. In particular, we investigate carrier–envelope phase effects that reveal emission dynamics. Furthermore, present detailed theory models support interpretation.
The combination of static balancing and tensegrity structures has resulted in a new class mechanisms: Statically Balanced Tensegrity Mechanisms. These are prestressed that equilibrium wide range positions, thus exhibit mechanism-like properties. This paper describes the design prototype model statically balanced mechanism based on classic structure.
Generally, adjustment of gravity equilibrators to a new payload requires energy, e.g., increase the preload balancing spring. A novel way energy-free is possible by introducing concept storage The spring supplies or stores energy necessary adjust balancer equilibrator. In essence, mechanism maintains constant potential within mechanism; exchanged between and when needed. Various conceptual designs using both zero-free-length springs regular extension are proposed. Two models were...
The Beetle Elytron Plate (BEP) is a new type of biomimetic sandwich core developed as potential replacement classical honeycomb cores in panels. This work investigates the out-of-plane engineering elastic constants, including Young's and pure shear moduli parametric BEP cellular topologies. configurations are simulated using Finite Element models, with both full-scale representative unit cells for asymptotic homogenization. numerical models also validated by flatwise compression loading...
Zero-stiffness structures have the remarkable ability to undergo large elastic deformations without requiring external work. Several equivalent descriptions exist, such as (i) continuous equilibrium, (ii) constant potential energy, (iii) neutral stability and (iv) zero stiffness. Each perspective on stiffness provides different methods of analysis design. This paper reviews concept categorises examples from literature by interpretation that best describes their working principle. Lastly, a...
Abstract Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases. As the unfold, volume of origami structure will change significantly, offering potential for use as inflatable deployable structures. This paper presents a geometric study multi-stable Miura-ori and Kresling bellows, focusing on their application space habitats. Such habitats would be compactly stowed during launch, before expanding once in orbit. The internal ratio between...
A synthesis of recent progress is presented on a topic that lies at the heart both structural engineering and nonlinear science. The emphasis thin elastic structures lose stability subcritically --- without nearby stable post-buckled state canonical example being uniformly axially-loaded cylindrical shell. Such are hard to design certify because imperfections or shocks trigger buckling loads well below threshold linear stability. resurgence interest in instability phenomena suggests...
An experimental method has been developed to locate unstable equilibria of nonlinear structures quasistatically. The technique involves loading a structure by the application either force or displacement at main actuation point while simultaneously controlling overall shape using additional bidirectional probe points. is applied shallow arch, and segments its equilibrium path are identified experimentally for first time. Shape control fundamental building block experimental-as opposed...
For origami structures, perforating or cutting slits along creases is an effective method to define fold lines and alleviate stress concentrations at vertices. In this letter we show numerically experimentally that for non-rigid-foldable bellows (e.g. Miura-ori, Kresling patterns) the introduction of small cut-outs vertices results in up order magnitude reduction bellows' stiffness under axial compression. Further, impact nonlinear response, e.g. position a force limit point presence...
Abstract This paper presents the modelling of a morphing fairing designed to cover joint on hinged commercial airliner wingtips, such as semi-aeroelastic Hinge concept. The is made from geometrically anisotropic thermoplastic rubber skin panels, which are 3D-printed multi-material polyurethane sandwich panels combining flexible facesheets with zero Poisson’s ratio cellular cores provide large extension capability alongside high out-of-plane stiffness. gaps in hinge smooth and continuous...
Gust load alleviation systems have the potential to significantly reduce airframe mass by reducing peak wing root bending moments. However, existing are active in that they rely on sensors and actuators function, which adds weight complexity. This work demonstrates a passively actuated spoiler concept. utilizes nonlinear structure gather store strain energy from wingbox, is then rapidly released via structural instability deploy leading-edge tab. The deployment of this tab locally stalls...