On November 22, a huge "snow painting" on the playground of a college in Harbin was screened. The giant aircraft carrier Shandong ship, the Type 095 attack nuclear submarine, the first manned submersible "7103" lifeboat, and the The image of Mi Manned Submersible "Struggle" is amazing.

The Ziniu News reporter learned that this was "drawn" by more than 700 teachers and students of Harbin Engineering University. Such activities have been going on for three years.

How is the huge formation of "snow ships" tens of meters long drawn accurately?

The planning teacher told reporters that, compared with the previous method of mapping, the students used Beidou satellite navigation to establish a coordinate system on the playground and present the design with 168 feature points.

"It's amazing, I only play snowball fights on snowy days." "This is a new height for playing in the snow!" Many netizens were shocked by this scene.

3 days

More than 700 people drew a 76-meter long aircraft carrier

　　The reporter learned that Harbin Engineering University is an important talent training and scientific research base in the field of "three seas and one nuclear" (shipbuilding industry, naval equipment, marine development, and nuclear energy applications).

Since last week, a rainy and snowy weather affected the country from north to south, and the students of Harbin Engineering University are preparing this highly creative project.

It started snowing in Harbin on November 19. Three days later, a giant "snow painting" composed of four ships appeared on the school's playground.

"We have a team of 4 people responsible for creativity, and a team of 16 people responsible for sketching." said Fang Shuai, a counselor from the School of Mechanical and Electrical Engineering of Harbin Engineering University. "The creative team includes 1 teacher and 3 students. The sketch design team is divided into industrial Students majoring in design and majoring in navigation and guidance work together in two teams.” The "snowship" that finally appeared on the playground was drawn by more than 700 teachers and students in the snow with tools such as shovels. .

The formation of huge "snow ships" tens of meters long is spectacular

　　At the beginning of the design, the students designed the rendering of the ship through software, set the coordinates for some points on the image, and then invited students majoring in navigation, guidance, and control to help with positioning.

"We also used some small stools and some red lines to mark our special points, and also used to outline the sketches on the snow, and finally used the snow removal tool to'draw'."

According to Fang Shuai, the pattern of the aircraft carrier in the snow is about 76 meters long. The aircraft carrier "Shandong Ship" and the Type 095 attack nuclear submarine are scaled down in a 4:1 ratio, while the "Struggle" and "7103 Lifeboat" are carried out in order to achieve visual effects. To a certain degree of artistic amplification and processing.

First use Beidou navigation to help draw

Improved the positioning accuracy of key points

　　How to accurately position the huge picture and draw it according to the accurate proportion?

Fang Shuai told reporters that this process is to connect many points into a picture.

Qi Mingyang, a graduate student from the School of Intelligence, said: "In previous years, the snowship construction used the method of ruler mapping and manual tracing. This year, the Beidou RTK combined with UWB positioning technology developed by the Intelligent Navigation and Detection Laboratory was used, which can continue to provide Centimeter-level positioning has greatly improved the positioning accuracy of the snowship’s key points, thereby ensuring that the snowship is in the correct position. The entire positioning process has been twice as short as before."

Students participate in snow-clearing activities on the playground

　　"To establish a connection between the satellite and our playground, we need to go through two coordinate calculations. First, establish the coordinates of the site, and then convert it into latitude and longitude through calculations, and use the latitude and longitude as the absolute coordinate system. We establish a coordinate system in the site and use this One device finds our absolute origin.” Fang Shuai explained to the Ziniu News reporter, “Three devices were involved at the scene, one is an origin base station, which provides reference coordinates. The other is a handheld base station, which is connected to the origin. Communication, we finally displayed a relative coordinate point on the playground on another handheld device, matched it according to the design drawing, and then we could find the exact point."

The students took the tools to participate in the production of the huge "snowship" formation

　　The day before the snow fleet was built, the positioning team and the industrial design students of the School of Mechanical and Electrical Engineering came to the scene in advance. Within 5 hours, 168 feature points and more than 1,200 meters of wiring were located on the 230-meter-long and 112-meter-wide military playground. , Outlined the embryonic form of the "snowship" formation, realizing a perfect fusion of art and science.

Many students are exposed to ice and snow for the first time

Everyone is excited

　　"The students in the design are more experienced. They have participated in this activity many times in a row, but many of Qingxue's classmates participated for the first time." Teacher Fang Shuai told the Ziniu News reporter, a classmate who participated in Qingxue Most of them are freshmen. Many of them are from the South who have not been exposed to ice and snow. They are especially willing to get close to ice and snow through this activity and experience such a culture.

"This year, the snow is thicker, and the deep places are 40 to 50 centimeters deep. Many students are more excited and excited after entering the snow. Some people lie directly in the snow, and some students are rolling. , It's quite interesting."

Classmates are busy Qingxue

　　Student Han who participated in Qingxue told reporters that for the first time she participated in this work this year, her biggest feeling was that it was too cold.

“It’s freezing cold in Harbin in November. Many students have no experience in the ice and snow, and they didn’t wear gloves. We didn’t see any special effects on the scene. When we saw it through the aerial shots of our classmates, I felt very shocked. Today I am especially proud after seeing my work on the Internet.” The reporter found that many students who did not participate also watched from the nearby teaching building.

Teacher Fang introduced that the activity itself did not cause a special sensation on campus, because there is no special visual perception on the playground, but in the circle of friends of the students, the effect on the Internet is particularly good.

The "snowship" formation under aerial photography has a good visual effect

On-site "Easter Eggs":

"Snowship" has a self-designed "carrier-based aircraft"

　　The reporter learned that the aircraft carrier on the playground is not just a graphic design. The students also played "Easter Eggs". The model aircraft produced by the Aircraft Innovation Team of the Aviation Engineering Institute became the "carrier-based aircraft" on the deck.

With an order from the navigator, the "Kunpeng" drone with its wings spread out from the snowy aircraft carrier into the sky.

After drawing a perfect route in the air, land safely.

Zhang Jianwei, the instructor of the model aircraft team, introduced: “This is an aircraft that is independently designed and produced by the students and has passed flight verification and has independent intellectual property rights. The aircraft is unmanned in the air, and its control program is also written by the students themselves." The third student Zhang Chong introduced: "Our'Zhan Wing Kun Peng' adopts a rare twin-body layout, and a pair of oppositely turned blades provides sufficient power for the aircraft. Unlike the past, in order to meet the requirements of sailing in wind and snow, this The second aircraft design uses a larger dead weight, but it can still be as light as a feather at takeoff and as stable as a mountain in wind and snow."

The model aircraft became the "carrier-based aircraft" on the deck

　　"Our school's major is related to national defense and marine construction. Drawing snow aircraft carriers on the snow is a great thing. This year we built a formation, and all the model airplanes are made by ourselves. . The entire process from design to construction, to the final take-off of the aircraft model, was completed by our team.” When it comes to the completion and take-off of the aircraft model, a student told reporters that he has also become a carrier-based pilot. The sacred feeling.

The latest "095 nuclear submarine"

　　This activity originated from the creativity of several students three years ago and has continued. From 20 people in 2018, to 400 people in 2019, to more than 700 people this year, more and more students are participating in the snow. The construction of the aircraft carrier is coming.

"We have painted aircraft carriers in the past two years, so this year has continued this style. Last year, when we painted dual aircraft carriers, we left an ellipsis. Then this year, the mystery of our ellipsis is also revealed. The theme, by drawing the '095 nuclear submarine' and the'Fighter' to explain to everyone, our Harbin Engineering University has always been the responsibility and mission: to ship, the sea, national defense, and contribute to the country's maritime cause." Fang Shuai said , Is also combined with a sentence in the school song: loyalty to cast a sword, fear the deep and far ocean.

　　Ziniu News Reporter｜Liu Liu

　　Ziniu News Intern｜Lin Fangxu