قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Flying, insect-like robot moves closer to an independent flight

Flying, insect-like robot moves closer to an independent flight



  The image of a four-winged robot.
Click to enlarge / RoboBee XWing without its power and electronics.

Noah T. Jafferis and E. Farrell Helbling, Harvard Microbubble Laboratory

More than six years ago, when Harvard researchers announced that they had made small flying robots, they immediately began talking about the prospect of their small works to work autonomously in complex environments. This seemed unrestrainedly optimistic, considering that the robots were flying, moving along a range of copper wires that brought power and control instructions; robots were guided by a computer that watched their positions with the camera.

Since then, however, the team has been working on refining small machines, giving them, for example, improved landing opportunities. Today, the team announced the first airplane demonstration. The flight is very short and not self-controlled, but the small ship manages to carry both the electric circuit and its own power source.

Thumbnail Issue

There are two miniaturization approaches that you can think of from top to bottom and bottom up. From top to bottom, companies reduce components and reduce their weight to allow smaller versions of quadcopter drones to fly, and some are already available that weigh only 10 grams. But this type of hardware faces some hard physical limitations that will limit how much it can shrink. Batteries, for example, eventually receive more than their mass for packing and maintaining hardware, not for storing charges. And friction begins to play a dominant role in the operation of standard rotary engines.

The alternative is bottom-up. Start with something like insect robots and find out how to expand their capabilities. Not surprisingly, after having built an insect robot, Harvard's team chose a bottom-up approach.

Their original design is with piezoelectric motors that can quickly close two wings, providing the robot with a flight. High voltage power supply and fast oscillating supply are supplied externally. The same was true for flight management information: the camera system watched the robot during flight, and the computer understood what adjustments were needed and sent the corrections directly to the wings.

The purpose of this job is to get rid of it. of a piece of this external hardware that shrinks so it can be placed on the robot itself. For this new job, researchers have focused on the power source that keeps the robot in the air.

Collapsing power

As noted above, batteries have problems reducing the weight to the kind needed, as things like shells, wires, and taxi will always contribute to weight, no matter how little is the battery of energy. The best battery that researchers can find was four times larger than the prototype robot. Instead, the team turned to photovoltaic hardware, where a 10-megawatt device can generate more than 7 watts of power when exposed to full sunlight

Flying their original hardware will require about seven times more. Thus, the researchers improved the robot's flight efficiency by increasing the area of ​​the wings while slowing the flapping of the wings. And the simplest way to do this is simply to double the number of wings, each executive now waving two wings. This addition, combined with several improvements in the actual actuators, allowed them to increase the lift generated by the wings by nearly 40%.

  Full RoboBee X-Wing design including power and electronics. "Src =" https: //cdn.arstechnica.net/wp-content/uploads/2019/06/Integrated_Bee.image-jpeg-640x640.jpeg "width =" 640 "height =" 640 "srcset =" https: / /cdn.arstechnica. <span class= Full RoboBee X-Wing design including power and electronics.

Noah T. Jafferis and E. Farrell Helbling, Harvard Microbubble Laboratory

The next question is connecting the piezoelectric drives to the solar energy source. Piezoelectric actuators require high voltage (200 V) and fast switching (200 Hz oscillations). These parts were assembled by blending finished and handmade components.

The final design involves placing the solar panels on a handle, a bit like an umbrella. This is done to protect the panels from airborne disturbances driven by the wings. Electronics, on the contrary, is left hanging on the bottom of the robot, providing little balance. The whole package is only 90 milligrams and has a weight ratio of 4: 1. The authors call the little awkward RoboBee X-Wing result.

Short flight

How does it work? Well, the included video shows that it flies but is extremely short; typical flights are for less than half a second and require three light sunlight. The authors call it "sustainable," which seems to be stretching the definition of the word. The robot mostly deals with control simply by not flying long enough to deal with it.

A short video describing the new flying robots.

But there are some significant opportunities for improvement. While the existing robot weighs only 90 milligrams, it can produce more than 350 milligrams of lift. The authors believe that they could almost double the weight of the vessel, while retaining a sufficient lift for decent work. In itself, this can easily be used to expand solar panels, increase power, switch on board sensors, or place the vessel control system – or perhaps more than one.

The current RoboBee X-Wing design also has many overhead to improve. The authors suggest that they can redesign the drive mechanisms to reduce the required voltage by half, which will allow them to simplify the voltage transformation electronics. It is almost certain that the electronics can be miniaturized, which will further reduce the weight. Another tuning of the electronics should allow the robot to recover some of its electricity, effectively increasing the available power. Researchers also want to look at how the air interacts with the robot's four wings to optimize further.

This is a great place for improvement and there is no doubt that RoboBee Mark II will one day be closer to the flight. can legitimately be described as "sustainable". In this sense, the RoboBee X-Wing should be seen as the second prototype, following the first version designed for innovative technology. The dispute over the use of the word "lasting" is irrelevant, as the purpose of this machine is to find out if the solar powered version actually puts the hardware on the right path to get on a permanent flight, perhaps with

Nature 2019. DOI: 10.1038 / s41586-019-1322-0 (for DOIs).


Source link