>>>>Single Rotor Plant Protection UAV
1) The rotor is large, the flight is stable, and the wind resistance is good.
2) The wind field is stable, the atomization effect is good, the downward swirling airflow is large, the penetrating power is strong, and the pesticide can hit the rhizome part of the crop.
3) The core components are imported motors, the components are aviation aluminum, carbon fiber materials, strong and durable, and stable performance.
4) The flight plant protection operation lasted for more than 2 years, and the continuous plant protection was 100,000 mu/time. There was no major failure, the flight was easy to learn, and the stable and intelligent flight control system was able to get started after simple training.
5) The required fuel is standard gasoline No. 93. It is easy to pick and use, and it is convenient and quick. It does not need to carry a battery or fuel engine that is several times the weight of the fuselage during operation. The comprehensive cost is low.
>>>>Multi-rotor plant protection drone
1) The technical threshold is low.
2) The cost is relatively cheap.
3) Domestic motors and accessories at the model level.
4) Poor wind resistance.
5) Poor continuous operation ability and low efficiency. A minimum of 2-4 battery packs are required for a single shelf. If 200 acres of plant protection work, it needs to fly 20 times, carrying 40-80 batteries and weighing about 80-160kg (single battery) The weight is about 2kg).
Due to the multi-rotor UAV, the rotor is small and the direction of rotation is opposite, resulting in scattered wind field and small coverage of the wind field. Therefore, in order to increase the spray area, the boom will be lengthened (the total length of the boom exceeds the diameter of the rotor) due to Due to aerodynamic reasons, it will sway from side to side during operation, resulting in unstable flight, increased difficulty in operation, and increased risk of falling.
Signal
Response time refers to the response speed of the Liquid Crystal Display to the input signal, that is, the response time of the liquid crystal from dark to bright or from bright to dark (the time for the brightness from 10%-->90% or 90%-->10%) , Usually in milliseconds (ms). To make this clear, we have to start with the human eye's perception of dynamic images. There is a phenomenon of "visual residue" in the human eye, and the high-speed motion picture will form a short-term impression in the human brain. Animations, movies, etc. to the latest games have applied the principle of visual residue, allowing a series of gradual images to be displayed in rapid succession in front of people's eyes to form dynamic images. The acceptable display speed of the picture is generally 24 frames per second, which is the origin of the movie playback speed of 24 frames per second. If the display speed is lower than this standard, people will obviously feel the picture pause and discomfort. Calculated according to this index, the display time of each picture needs to be less than 40ms. In this way, for the liquid crystal display, the response time of 40ms becomes a hurdle, and the display above 40ms will have obvious picture flicker, which makes people feel dizzy. If you want the image screen to reach the level of non-flicker, it is best to achieve a speed of 60 frames per second.
I used a very simple formula to calculate the number of frames per second under the corresponding response time as follows:
Response time 30ms=1/0.030=approximately 33 frames per second
Response time 25ms=1/0.025=approximately 40 frames per second
Response time 16ms=1/0.016=approximately 63 frames per second
Response time 12ms=1/0.012=approximately 83 frames of pictures displayed per second
Response time 8ms=1/0.008=approximately 125 frames per second
Response time 4ms=1/0.004=approximately 250 frames per second
Response time 3ms=1/0.003=approximately display 333 frames per second
Response time 2ms=1/0.002=approximately 500 frames per second
Response time 1ms=1/0.001=approximately 1000 frames per second
Tip: Through the above content, we understand the relationship between response time and the number of frames. From this, the response time is as short as possible. At that time, when the LCD market first started, the lowest acceptable range of response time was 35ms, mainly products represented by EIZO. Later, BenQ's FP series came out to 25ms. From 33 to 40 frames, it was basically undetectable, and it was really quality. The change is 16ms, displaying 63 frames per second to meet the requirements of movies and general games, so 16ms is not obsolete. With the improvement of panel technology, BenQ and ViewSonic started a speed battle. ViewSonic started from 8ms to 4ms. Released to 1ms, it can be said that 1ms is the final controversy of LCD speed. For game enthusiasts, 1ms faster means that CS's marksmanship will be more accurate, at least psychologically, such customers should recommend the VX series of monitors. But everyone should pay attention to the grayscale response when selling. The text difference in full-color response may sometimes mean the same thing as gray-scale 8ms and full-color 5ms. It is the same as when we sold CRTs before, we said that the dot pitch is .28, LG just I have to say that he is .21, but the horizontal dot pitch is ignored. In fact, the two are talking about the same thing. LG has come up with a sharpness of 1600:1. This is also a conceptual hype. Everyone uses the basic screen. There are only a few companies on the list, and how can only the LG family achieve 1600:1, and everyone stays at the level of 450:1? When it comes to consumers, the meaning of sharpness and contrast is obvious, just like AMD's PR value, which has no real meaning.
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