The Configuration Of Wings Wing - 1069 Words

To acquire some perspective and information on the current flapping wing MAVs, it is useful to investigate the existing product that has been completed by a variety of research groups, companies and personal maker. Depending on distinct different size, flapping wing air vehicles (ornithopers) can be differentiated into two groups, MAVs and full-size ornithopters. The first group, as mentioned is the vehicles with dimensions less than 0.2m. The second group is relevant to large vehicles. The concerns of size limitations have intensively correlations with flapping mechanisms. The flapping mechanism is the primary issue and technique in flapping MAVs because it is used to convert the rotary motioin into an oscillatory motion and hence makes a†¦show more content†¦Utilization of bending, a pin, torsion springs and follower assembly is to control pitching motion. A picture can be seen in Figure 2.10. The second style is a front-mounted double pushrod mechanism, also called four bar linkage (FBL) mechanism [25]. A motor connects gears assembly that increase flapping force while reducing flapping rate. Two pushrods with fixed length are connected to each flapping spar, thus driving the wing doing up and down motion through pinned connections. Because of the pinned connections, only the vertical component of motion is transferred from the drive mechanism. This mechanism is extensively used due to its simplicity, light weight and ease of part replacement. Figure 2.11 shows the Chung Hua University flapping MAV applied the FBL mechanism [29]. The following one is a flapping wing UAV design and has been flew successfully in actual, which is designed by DeLaurier et al. [26]. Similar to the others, this mechanism converts rotation to translation. The working procedure is a motor connected with a system of gears by conveyer belts. While the motor is running, the mechanism is driven in an up and down motion and transport the motion to two parallel posts. The output of the two posts is converted to a centre section of wing which is connected to both wings in a hinge. Frequencies in the range of 3-5 Hz have been discovered in this mechanism [26]. 3. Summary Since a