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PneuAct uses a machine knitting process
"PneuAct uses a machine knitting process — not dissimilar to your grandma's plastic needle knitting — but this machine operates autonomously. A human designer simply specifies the stitch and sensor design patterns in software to program how the actuator will move, and it can then be simulated before printing. The textile piece is fabricated by the knitting machine, which can be fixed to an inexpensive, off-the-shelf rubber silicone tube to complete the actuator.
The knitted actuator integrates conductive yarn for sensing, allowing the actuators to "feel" what they touch. The team cooked up several prototypes spanning an assistive glove, a soft hand, an interactive robot, and a pneumatic walking quadruped. Their devices were wrapped in a soft, yellow fabric that made them look a little bit like banana fingers."
Light 3D printed glove for rehabilitating stroke patients
"... mechanism by which customisable wearables like hand gloves can be designed, 3D printed, and controlled remotely. “The idea behind the device is that you wear something like a glove, the physiotherapist controls the device from a remote location through the internet, and makes your hands and fingers move,” describes Bid. The device can sense various hand and finger movements, and precisely detect parameters like pressure, bending angle and shape."
Self-healing materials for robotics made from ‘jelly’ and salt
"The low-cost jelly-like materials, developed by researchers at the University of Cambridge, can sense strain, temperature and humidity. And unlike earlier self-healing robots, they can also partially repair themselves at room temperature."
"A 'delta' robot or printer is a robot where a platform is maintained by three pair of arms set in a triangle. The pairs of parallel arms maintain the horizontality of the platform and the movement of these arms displace the platform in the three dimensions. Many solutions exists, but a few are used practically."
A simple implementation: https://www.thingiverse.com/thing:2353468
Gelatin-based biogels for soft robots and electronics
"Biodegradable and biocompatible elastic materials for soft robotics, tissue engineering or stretchable electronics with good mechanical properties, tunability, modifiability or healing properties drive technological advance, and yet they are not durable under ambient conditions and do not combine all the attributes in a single platform. We have developed a versatile gelatin-based biogel, which is highly resilient with outstanding elastic characteristics, yet degrades fully when disposed. It self-adheres, is rapidly healable and derived entirely from natural and food-safe constituents. We merge all the favourable attributes in one material that is easy to reproduce and scalable, and has a low-cost production under ambient conditions. This biogel is a step towards durable, life-like soft robotic and electronic systems that are sustainable and closely mimic their natural antetypes."
Sonoflex: Embroidered Speakers Without Permanent Magnets
The function principle of the embroidered speaker. The voice coil is powered by the amplified source signal, the bias coil is powered by a gated DC signal. A full-wave rectifier with a smoothing capacitor was used in our implementation to power the bias coil
"A lightweight speaker is constructed without permanent magnets by providing two coils, one of which is mounted on a movable membrane and the other of which is mounted on a fixed frame. The coils are mounted in close proximity to one another and excited by a common source signal from a common amplifier or the like in such a fashion that the electromagnetic fields created by the coils upon excitation interact to cause the coils to alternately attract and repel one another. One of the coils is fed with an excitation signal directly from the source. The other coil receives the source signal only indirectly, preferably via a bridge rectifier. The coils may take the form of conventional wound wires or, in a particularly sophisticated yet inexpensive embodiment, may be formed on a printed circuit board in the form of flat spirals. The resulting speaker is very lightweight and thus is well suited for use in automobiles, airplanes, and other applications in which weight minimization is important."
"The simplest version of a flat speaker is a giant copper spiral. Cut on a vinyl-cutter from an adhesive copper sheet, the copper circuit trace is transferred to a Mylar sheet which acts a light-weight and flexible yet rigid diaphragm."
Planar Magnetic Speaker
Planar magnetic drivers consist of a thin diaphragm tensioned and suspended over an array of magnets. Conductive material is attached to the diaphragm in such a way that when a current is passed through it, the conductor will move the presence of magnetic field and in turn move the diaphragm.
Última actualização/Last updated: 08-05-2022 [09:16]
(c) Tiago Charters de Azevedo