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基于最優(yōu)控制策略的復(fù)雜環(huán)境移動(dòng)機(jī)器人軌跡規(guī)劃
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河北省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(21351802D)和吉林省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(20200401130GX)


Optimal Control-based Trajectory Planning Method of Mobile Robot in Complex Environment
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    摘要:

    復(fù)雜環(huán)境下移動(dòng)機(jī)器人軌跡規(guī)劃由于障礙物放置雜亂且無規(guī)律,常常面臨避障失敗的問題。本文將機(jī)器人的軌跡規(guī)劃歸結(jié)為優(yōu)化問題,提出了一種基于優(yōu)化策略的軌跡規(guī)劃方法。該方法包括3部分:首先,對(duì)優(yōu)化問題的約束建模,包括機(jī)器人的運(yùn)動(dòng)學(xué)模型、變量極值約束、障礙物避碰模型;然后,建立優(yōu)化求解策略,通過決策變量區(qū)間均分、內(nèi)置插值點(diǎn)和基于拉格朗日多項(xiàng)式的變量描述方式進(jìn)行離散化,針對(duì)離散化導(dǎo)致的約束失效對(duì)變量進(jìn)行等距時(shí)間離散并建立懲罰函數(shù),從而實(shí)現(xiàn)有效避障;最后,基于隨機(jī)分形搜索算法對(duì)上述優(yōu)化模型進(jìn)行求解。仿真結(jié)果表明,本文所述方法可以有效解決移動(dòng)機(jī)器人在復(fù)雜環(huán)境下的障礙物避碰問題。

    Abstract:

    As autonomous mobile machines become more intelligent, the trajectory planning of mobile robots in complex environments often faces the problem of obstacle avoidance failure due to the cluttered and irregular placement of obstacles. Trajectory planning of robot was reduced to optimization problem, that was, the objective function was defined, and then the constraint conditions were set according to the actual planning requirements of the mobile robot, and the appropriate solver was selected. Firstly, the constraint modeling of optimization, including the robot’s kinematics, geometric model, variable extremum constraint and obstacle collision avoidance model were considered. Then an optimization strategy was established to discretize variables by means of interval equipartition of variables, built-in interpolation points and variable description method based on Lagrange polynomial. And for the constraint failure caused by discretization, the variables were discretized by equidistance time and the penalty function was established, so as to realize effective obstacle avoidance. Finally, the stochastic fractal search algorithm was used to solve the above optimization problem. The simulation results showed that the method described can effectively solve the obstacle avoidance problem of mobile robots in complex environments. Also both satisfied the constraints of maximum speed and maximum steering angle. Compared with the existing classical algorithm in the simulation, the experimental results showed that the algorithm described had good robustness in the narrow environment with many obstacles.

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張泮虹,倪濤,趙亞輝,翟海陽,趙澤仁.基于最優(yōu)控制策略的復(fù)雜環(huán)境移動(dòng)機(jī)器人軌跡規(guī)劃[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2022,53(7):414-421. ZHANG Panhong, NI Tao, ZHAO Yahui, ZHAI Haiyang, ZHAO Zeren. Optimal Control-based Trajectory Planning Method of Mobile Robot in Complex Environment[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(7):414-421.

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  • 收稿日期:2022-04-27
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  • 在線發(fā)布日期: 2022-07-10
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