A review on optimization of composite structures Part I: Laminated composites

For computationally expensive black-box problems, surrogate models are widely employed to reduce the needed computation time and efforts during the search of the global optimum However, the construction of an effective surrogate model over a large design space remains a challenge in many cases In this work, a new global optimization method using an ensemble of surrogates and hierarchical design space reduction is proposed to deal with the optimization problems with computation-intensive, black-box objective functions During the search, an ensemble of three representative surrogate techniques with optimized weight factors is used for selecting promising sample points, narrowing down space exploration and identifying the global optimum The design space is classified into: Original Global Space (OGS), Promising Joint Space (PJS), Important Local Space (ILS), using the newly proposed hierarchical design space reduction (HSR) Tested using eighteen representative benchmark and two engineering design optimization problems, the newly proposed global optimization method shows improved capability in identifying promising search area and reducing design space, and superior search efficiency and robustness in identifying the global optimum

Ensemble of surrogate based global optimization methods using hierarchical design space reduction

Optimized design of an autonomous underwater vehicle, for exploration in the Caribbean Sea

Experimental and numerical buckling analysis of carbon fiber composite cylindrical shells under external pressure

Performance-based Design and Manufacturing of Filament Wound Type-4 Cylinders for Compressed Gas Storage

Self-powered bionic antenna based on triboelectric nanogenerator for micro-robotic tactile sensing

Piezoelectric soft robot driven by mechanical energy

Composite is used to substitute aluminum alloy as material of the underwater vehicle in this study Nonlinear buckling behaviors of composite cylindrical underwater shell are studied using ANSYS software Carbon/Epoxy is selected as material of the vehicle through comparative analysis Optimization of ply sequence, thickness and angle of composite cylindrical shell subjected to hydrostatic pressure is investigated Both buckling and material damage is considered in the optimization, the results show that buckling is the major destroy form The vehicle's buckling pressure is greatly increased after optimization And the vehicle's working depth has a 32% increase without changing its shape and structure

Optimization of Composite Cylindrical Shell Subjected to Hydrostatic Pressure

It is still challenging to achieve agility and trajectory control for untethered soft robots on an insect scale given their low mechanical impedance and compact structures. In this study, fast translational movements and swift turning motions are demonstrated on a power autonomous soft robot with a piezoelectric-thin-film-actuated body and electrostatic turning footpads. A high relative running speed of 2.5 body length per second compared with existing untethered robots is realized on a 24-mm-long untethered prototype integrated with power source, control, and wireless communication modules. An arc-shaped leg structure is adopted to self-regulate the frication forces on different footpads during turning by an inclination-induced redistribution of the payload gravity on legs and footpads. The trajectory maneuverability is demonstrated by navigating a 380 mg robot prototype with an 1810 mg payload to pass through a 58-cm-long S-shaped path with wireless control in 43.4 s. Due to the flexibility of the all-polymer body structure, the robustness of the untethered robot to large strain is demonstrated when compressed by 91 times the weight of the robot. A maximum travel distance of 58.6 m is achieved for the robot equipped with a 40 mA·h lithium battery, corresponding to the cost of transport of 261. This work provides a feasible solution to achieve high agility and advance the practicability of untethered soft robots on an insect scale.

Power Autonomy and Agility Control of an Untethered Insect-Scale Soft Robot.

This article proposes a piezoelectric-driven insect-scale soft robot with ring-like curved legs, enabling it to traverse complex three-dimensional (3D) terrain only by body-terrain mechanical action. Relying on the repeated deformation of the main body's n and u shapes, the robot's leg-ground mechanical action produces an "elastic gait" to move. Regarding the detailed design, first, a theoretical curve of the front leg with a fixed angle of attack of 75° is designed by finite element simulation and comparative experiments. It ensures no increase in drag and no decrease in the lift when climbing steps. Second, a ring-like leg structure with 100% closed degree is proposed to ensure a smooth pass through small-sized uneven terrain without getting stuck. Then, the design of the overall asymmetrical structure of the robot can improve the conversion ratio of vibration to forward force. The shape of curved legs is controlled by pulling the flexible leg structure with two metal wires working as spokes. The semirigid leg structure made of fully flexible materials has shape stability and structural robustness. Compared with the plane-legged robot, the curved-legged robot can smoothly traverse different rugged 3D terrains and cross the terrain covering obstacles 0.36 times body height (BH) at a speed of >4 body lengths per second. Moreover, the curved-legged robot shows 100% and 64% chances of climbing steps with 1.2- and 1.9-times BH, respectively.

Complex Three-Dimensional Terrains Traversal of Insect-Scale Soft Robot.

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