直升机重装空投状态下的动态特性

Dynamic characteristics of helicopter under heavy cargo airdrop condition

为了研究直升机在重装空投过程中货物的运动对直升机姿态角的影响,首先建立了直升机CH-53D的动力学模型,并通过模型仿真结果和直升机飞行实验数据的对比验证了的直升机动力学模型的合理性。然后在直升机动力学模型的基础上,采用分离法建立了直升机重装空投两个阶段的动力学模型,并进行了直升机在悬停和前飞两种空投状态下的配平仿真。结果表明:相较于悬停状态空投,前飞状态空投具有更好姿态保持能力,主要表现在前飞状态下空投只会对直升机的纵向姿态角产生影响,而在悬停状态下空投对直升机的纵横向姿态角都会产生较大的影响。

In order to study the effect of cargo movement on the helicopter attitude angle during helicopter heave cargo airdrop,the helicopter CH-53 D dynamic model was established.And the rationality of the helicopter dynamics model was validated by comparison of the simulation results of the model with the flight experiment data of the helicopter.Then based on the helicopter dynamic model,the dynamic model of the helicopter heavy cargo airdrop process was established by the separation method,and the trim simulation of the helicopter in these two airdrop states of hovering and forward flight was carried out.The results show that compared with the hovering airdrop,the forward flight airdrop has a better attitude maintaining ability.This is mainly reflected in the fact that the airdrop only affects the helicopter’s longitudinal attitude angle in the forward flight,but has a great influence on both longitudinal attitude angle and lateral attitude angles in the hovering state.