The sound stealth device, as the name suggests, avoids the equipment that is observed through sound. This technology can work at any angle, no matter where the sound comes from or where the observer is located, it can be found. This technology is expected to be used in sonar avoidance and architectural acoustics in the future.
Steven Cummer, a professor of electrical and computer engineering at Duke University in North Carolina, United States, said that the special feature of the cloak is to hide objects from the sound waves and cover the object with the cloak. The sound waves behave like nothing there. A plane." In order to achieve this goal, Cummer and his colleagues turned to metamaterials, using artificial materials in a repeating pattern of natural materials. In order to develop new acoustic capes, the materials that manipulate the behavior of sound waves are plastic and air. When set up, the device looks like several repeating patterns of porous plastic substrates stacked together, similar to a pyramid.
In order to create the illusion that there is no object below, the cape must change the trajectory of the sound wave to match the reflection on the plane. Because the sound cannot reach the lower surface, the transmission distance is shorter and the speed must be slowed down to compensate.
Cummer said in a statement: "The structure we built looks simple... but I assure you this is a very complex structure and it looks more interesting than it looks. We devote a lot of energy to calculating how sound waves will This is not an overnight event.†To test the stealth device, the researchers used a cloak to cover a small sphere and then fired short bursts of sound from different angles. They use a microphone to draw the acoustic response and make a video of the sound waves through the air. The experimental results show that the cape behaves like a sound wave reflected on an empty surface in sound waves.
Experiments have shown that this technology is feasible, and Cummer believes that this technology has several potential commercial applications. We tested in the air and underwater sounds were similar, so an obvious potential application is to avoid sonar, Cummer said, but the design of the auditorium, the concert hall—anywhere you need to control the sound can also be applied. The study was funded by a multidisciplinary university research program from the U.S. Maritime Research Office and the U.S. Land Research Office.
The main feature of the Desktop Cnc Router is the small and simple structure under the special spindle design. Various materials can be applied by the machine, such as PVC, Acrylic, wood, PCB, even some soft metal like aluminum and copper. Besides, all the machines are equipped with Mach3 controller. In addition, the machine can achieve the performance of good resolution and less noise with ball screw.
Product Description:
2. UTECH 3040 3axis 800W - is a professional mini- size machine with working area 300 x 400 mm (30 x 40 cm). Has the most powerful ruler in the spindle: XYZ. The spindle has a water cooling - it provides reliability and long service life.
3. Difficult to think of the problem, which cannot handle this car. The only limitation to the possibilities in front of large and heavy brethren: Stage size and speed of processing, and in the aggregate: functionality, compactness and price - out of competition.
4. The machine can easily be placed in a small workshop or home. Will apply for relief 3d- treatment (three-dimensional objects , reliefs, souvenirs, cliche) , engraving (personalization items , creating labels , jewelry , engraving PCBs ) , all types of cutting (letters and labels , signs , models ) , drilling.
Product use:
B. Graphite electrode processing, carving PCB circuit board, wood model mold crafts.
C. 3d sculpture of aluminum alloy, copper and other metal materials according to the feed rate.
D. Can be used as a simple three-dimensional numerical control platform, such as numerical control point glue, numerical control positioning, metal marking.
The main types of treatment:
EtchingCutting
3d- milling
Boring
Milling and engraving on a rotating axis.
Wood
Plastic
Chipboard, MDF , plywood
Light metals (copper, aluminum , brass)
Advertising industry
Creative workshops
Jewelry / designer items
Merchandise
Interior and decor elements
Type
6040
3040
3020
Max working travel
XYZ=400*570*75mm
XYZ=290*380*60mm
XYZ=210*300*60mm
Machinable material thickness
≤100mm
≤70mm
≤70mm
Dimensions
750*570*390mm
525*400*290mm
440*310*290mm
Frame material
6061-T5 aluminium alloy
6061-T5 aluminium alloy
6061-T5 aluminium alloy
Track type
Chrome-plated + linear bearing
Chrome-plated + linear bearing
Chrome-plated + linear bearing
Spiral type
Ball screw, diameter of 16mm, Thread pitch 5mm
T-screw, diameter of 12mm, Thread pitch 2mm
T-screw, diameter of 12mm, Thread pitch 2mm
Ball screw, diameter of 12mm, Thread pitch 4mm
Ball screw, diameter of 12mm, Thread pitch 4mm
Mechanical resolution
XYZ axis:0.0025mm/step
XYZ axis:0.0025mm/step
XYZ axis:0.0025mm/step
PositionaI accuracy
0.05mm
0.05mm
0.05mm
Spindle motor
Frequency conversion spindle, 0.8kw
2-300W DC spindle
2-300W DC spindle
Revolving speed
24000rpm/min
11000rpm/min
11000rpm/min
Holder
ER11(3.175mm,6mm)
ER11(3.175mm,6mm)
ER11(3.175mm,6mm)
XYZ motor
Stepper motor JK57HS76-4204B-01AF
Stepper motor JK57HS41-2004XB-01AF
Stepper motor JK57HS41-2004XB-01AF
Stepper driver
High performance, independent of each axis
High performance, independent of each axis
High performance, independent of each axis
Feed rate
2000mm/min
1500mm/min
1500mm/min
Communication Interface
USB2.0
USB2.0
USB2.0
System requirement
WIN-XP or WIN-7
WIN-XP or WIN-7
WIN-XP or WIN-7
Instruction code
G code/.nc/.ncc/
.tab/.txt
G code/.nc/.ncc/
.tab/.txt
G code/.nc/.ncc/
.tab/.txt
Voltage
Input 85V-240VAC(400HZ)
Input 85V-240VAC(400HZ)
Input 85V-240VAC(400HZ)
Operating environment
Temperature: 5℃-40℃; Humidity: 35%-80%
Temperature: 5℃-40℃; Humidity: 35%-80%
Temperature: 5℃-40℃; Humidity: 35%-80%
Packaging size
45.8kg (86*62*48mm)
25.5kg(61.5*48.5*38.5 mm)
22kg(51*40*38.5mm)
Mini Desktop Cnc Router
Mini Desktop Cnc Router,Mini Cnc Router,Small Cnc Router,Mini Desktop Cnc Router Machine
Shandong U-May CNC Technology Co., Ltd. , http://www.sesamecnc.com