Author Archives: Bo Tang

Upgrading and reconstruction of valves of the Mars atmosphere simulator

13 Dec 22
Bo Tang
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ID: NEWS2022-No.12

Time: December 13, 2022

Place: Harbin, China

Event: The Mars atmosphere simulator is a significant experimental setup for testing rotor performance in the simulated atmosphere of Mars. To improve the recovery speed of air pressure inside the tank after the experiment is completed, a larger size air inlet valve is replaced outside the tank, thus reducing the air pressure recovery time to less than 60 minutes. To solve a potential safety hazard that the experimenters are locked in the tank by mistake, a safety valve is installed inside the tank, which can be used for self-rescue in case of emergency to protect the life of the experimenters.

 

This work is completed by Bo Tang and Yuheng Wang. This article is contributed by Bo Tang.

Swashplate Attitude Adjusting Motors for MarsBird-IV Tested Successfully

17 Nov 22
Bo Tang
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ID: NEWS2022-No.11

Time: November 17, 2022

Place: Harbin, China

Event: MarsBird-IV is one of the serialized Mars rotorcraft prototypes developed by AMT laboratory. MarsBird-IV employs a parallel swashplate mechanism to realize its attitude control. At present, the prototype is developed and the test of the swashplate attitude adjusting motors is preliminarily completed. A FPGA control circuit drives the servos under the control of an xPC target computer and receives the commands with a delay in the range of 5×10–5 to 10–4 s. Experiments show that the angular position control accuracy of servos is ±0.06° so that the servos can reach the designated position quickly and accurately. AMT laboratory will further optimize the control algorithm to reduce the angular position oscillation and improve the control accuracy of the servos.

 

This work is completed by Yachao Dong and Hao Cai. This article is contributed by Yachao Dong.

File system of Target PC test

09 Nov 22
Bo Tang
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ID: NEWS2022-No.10

Time: November 09, 2022

Place: Harbin, China

Event: Rapid Control Prototyping (RCP) is a kind of model-based algorithm design and semi-physical simulation. RCP allows researchers to focus on abstract aspects such as model building and algorithm design, without concentrating on programming and debugging. The AMT laboratory successfully builds the RCP target computer with the help of the abundant modules provided in Simulink Real-Time. The target computer can be used with FPGA to provide adequate I/O interfaces, while the target file system allows researchers to record large amounts of process data. Users can connect the target I/O interface with the controlled object to achieve real-time simulation. The recorded data in the test process can be employed to optimize the control algorithm.

 

This work is completed by Yuanxu Wu and Qiukui Zhang. This article is contributed by Yuanxu Wu.

Maxon EC 69 motor test

08 Nov 22
Bo Tang
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ID: NEWS2022-No.9

Time: November 08, 2022

Place: Harbin, China

Event: The AMT laboratory carries out experiments to test the performance of the Maxon EC 69 motor. The experimental results show that when the rotational speed exceeds 4000 r/min, the efficiency of the motor reaches 75%. When the rotational speed is set to be 7000 r/min, the effective output power reaches 191 W, and the input power supply reaches 250 W. The AMT laboratory will further study the change of stator winding’s temperature with working time under different rotational speeds and thus analyze the motor’s operating characteristics.

 

This work is completed by Qi Wu and Yuanxu Wu. This article is contributed by Qi Wu.

Ethernet communication between target PC and FPGA succeeds

27 Oct 22
Bo Tang
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ID: NEWS2022-No.8

Time: October 26, 2022

Place: Harbin, China

Event: The Real-Time control platform based on xPC Target is a semi physical simulation system for Rapid Control Prototyping (RCP), which has been used in AMT laboratory for a long time. NI’s PCI-6229 multi-function data acquisition card has always been an indispensable part of the target computer. We abandon the expensive data acquisition card in the target computer and adopt a low-cost ethernet network card to communicate with the external FPGA control board at high speed. At present, the communication loopback time between the target computer and the FPGA control board is at the level of 10-4 s, and thus the platform has high real-time response capability. AMT laboratory will further improve the relevant functions of this platform and apply it to the development of series products.

This work is completed by Hao Cai and Yuanxu Wu. This article is contributed by Hao Cai.

MarsBird-VI attitude adjustment succeeds

20 Oct 22
Bo Tang
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ID: NEWS2022-No.7

Time: October 20, 2022

Place: Harbin, China

Event: As one of the series of Mars UAV prototypes developed by AMT laboratory, MarsBird-VI adopts electromagnetical pitch adjusting method to control the attitude of aircraft. At present, the prototype has been preliminarily developed and the joystick attitude tracking test has been carried out. The experimental results show that the rotor of MarsBird-VI can imitate the acts of joystick to adjust attitude, but there is still a certain delay in response. The AMT laboratory will further optimize the attitude control algorithm of MarsBird-VI to improve the accuracy of attitude control.

 

This work is completed by Yuanxu Wu. This article is contributed by Yuanxu Wu.

S400 Thrust Test in Low Pressure

12 Sep 22
Bo Tang
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ID: NEWS2022-No.6

Time: September 12, 2022

Place: Harbin, China

Event: Appointed by Mr. Yuan Xue, CTO of GDU Technology, Mr. Hairui Wang brought the S400 rotorcraft to carry out the hovering thrust experiment of the rotor in the simulated environment of Mars in Harbin Institute of Technology. The experimental results show that in the low pressure environment of 1350 Pa with the equivalent Martian atmospheric density, the thrust generated by the rotor of the S400 rotorcraft is greatly reduced. Experimental tests of the plain blade and the plateau blade were carried out respectively. In the experiment, it was found that the generated thrust of the plateau blade under the Martian pressure is slightly higher than that of the plain blade.

 

This work is completed by Bo Tang. This article is contributed by Bo Tang.