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摘要:
集群是鱼类生物中一种常见的现象, 特定编队的集群运动可以显著提高鱼群的游动效率. 鱼集群游动节能机理的研究为机器人集群编队设计和控制提供启发与帮助, 得到了研究人员的广泛关注. 本文介绍了鱼集群游动节能机理研究的主要方法及最新的研究成果, 将研究方法分为鱼群观察分析法、计算流体力学仿真法和实验装置研究法, 并基于此对近些年的研究成果进行了综述和分析, 最后列举了鱼集群游动节能机理研究的主要问题与未来发展方向.
Abstract:Schooling is a common phenomenon in fish creatures. The swimming efficiency of fish can be significantly improved by schooling movement of specific formation. The research on the energy-saving mechanism of fish schooling provides inspiration and help for the design and control of robot swarm formation, and has been widely concerned by researchers. In this paper, the main methods and the latest research results of energy-saving mechanism of fish schooling are introduced. We divide the research methods into three categories, namely observation analysis approach, computational fluid dynamics simulation approach, and experimental setup research approach. Achievements of the research on the energy-saving mechanism based on these methods are discussed thoroughly. Finally, the main problem and future research directions are listed.
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Key words:
- Fish schooling /
- cluster swimming /
- energy-saving mechanism /
- formation
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图 11 由两条、三条和四条鱼组成的队列及涡度结构示意图 ((a)两鱼并排(反相位); (b)两鱼并排(同相); (c)两鱼串列(紧凑); (d)两鱼串列(松散); (e)两鱼交错(紧凑); (f)两鱼交错(松散); (g)三鱼并排(反相位); (h)三鱼并排(同相); (i)三鱼梯队; (j)三鱼交错(I型); (k)三条鱼交错(II型); (l)四条鱼矩形(紧凑, 反相位); (m)四条鱼矩形(松散, 反相位); (n)四条鱼菱形)[72]
Fig. 11 The swarm configurations and flow structures of two, three and four fish ((a) two fish side-by-side (anti-phase); (b) two fish side-by-side (in-phase); (c) two fish in-line (compact); (d) two fish in-line (loose); (e) two fish staggered (compact); (f) two fish staggered (loose); (g) three fish side-by-side (anti-phase); (h) three fish side-by-side (in-phase); (i) three fish echelon; (j) three fish staggered (type I); (k) three fish staggered (type II); (l) four fish rectangular (compact, anti-phase); (m) four fish rectangular (loose, anti-phase); (n) four fish diamond)[72]
表 1 鱼群观察分析法的发展历程
Table 1 The development of the method of observation and analysis for fish schooling
作者 研究方法 主要结论 (涡流效应) Brede[18] (1965) 观察鱼群游动过程 维持漩涡的完整性对鱼群游动的效率很重要 Weihs[1, 19] (1973) 观察鱼群, 构建二维鱼群编队水动力模型 菱形为最优队形, 鱼群有效利用漩涡最多可节省50%的能量 Herskin等[10] (1998) 测量9条海鲈鱼集群游动时的尾拍频率 后方鲈鱼的尾拍频率比在前方鲈鱼最多降低14%, 耗氧率降低23% Svendsen等[21] (2003) 测量8条拟鲤组成菱形编队游动时的尾拍频率 后方鱼的尾拍频率最多可比在前方低11.9%, 菱形编队有利于节能 Liao等[22-25] (2003) 观察在圆柱挡板后游动的鳟鱼, DPIV观察涡流分布, 生物肌电信号测量仪测量鳟鱼的肌电信号 鳟鱼通过感知并利用涡流来保持卡门步态, 减少了肌肉活动. 证明鳟鱼会自动改变身体运动来从漩涡中获取能量 作者 研究方法 主要结论 (槽道效应) Burgerhout等[31] (2013) 观察7条欧洲鳗鲡在水槽中集群游动过程, 并测量鳗鱼尾拍频率 鳗鱼集群游动可减少30%功耗. 鳗鱼倾向于以彼此平行的同步方式游动, 利用个体之间的侧向力达到节能目的 Marras等[35] (2015) 利用相机与DPIV观察灰鲻鱼集群游动及水流情况, 测量标记鱼在不同位置的尾拍频率与幅值 鱼群任何位置都可以节能, 耗氧率最多降低19.4%. 不只是尾部涡流, 鱼体前端周围的流体动力学也有助于提高邻近鱼游动效率 Ashraf等[36-37] (2016, 2017) 利用立体视频记录仪跟踪红鼻四头鱼集群中每条鱼的3D位置及尾鳍摆动 鱼群快速游动时, 倾向于“矩形”或“并列”编队. 鱼间的水动力相互作用可以提高游动效率, 证明槽道效应在鱼群节能过程中发挥重要作用 
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表 2 CFD仿真法的发展历程
Table 2 The development of the method of CFD simulation for fish schooling
作者 研究方法 主要结论 (涡流效应) Kelly等[44-45] (2005, 2010),
Deng等[46] (2006), Chung[47] (2011)从菱形鱼群中提取出三条鱼作为基本单元, 对其游动进行数值模拟 后方鱼可捕获前方鱼制造的尾涡, 并从脱落的反卡门涡街中受益达到节能目的 Pan等[48] (2010), Shao等[49] (2010),
Xiao等[50-51] (2011, 2012),
Chao[52-53] (2018, 2019)数值模拟D形圆柱后柔性板NACA0012的被动运动 上游圆柱的存在增强了其尾流中的反卡门涡街, 后方柔性板的推力系数可提高4倍 Khalid等[54] (2016), Tian等[55-56]
(2011, 2016),
Maertens等[57] (2017)分别数值模拟两条二维与三维的仿真鱼在编队中的游动 串联和交错编队均能提高游动效率, 后方鱼效率最高可提高30%. 通过利用迎面漩涡, 后方鱼可在能与前方鱼尾迹相互作用的位置受益 Novati等[62] (2017), Verma等[63] (2018) 分别数值模拟两条二维与三维自主仿真鱼编队游动, 先导鱼步态固定, 尾随鱼利用深度强化学习来调整步态 尾随鱼的能量消耗减少30%, 游动效率增加20%. 鱼类可以通过将身体置于前方鱼身后的适当位置并拦截其脱落的涡流来提高自身推进效率 作者 研究方法 主要结论 (槽道效应) 王亮[64] (2007) 数值模拟多条二维仿真鱼在粘性流体中编队游动 小鱼跟随大鱼多利用侧向漩涡来提高推进效率. 体形相差不大的鱼多利用尾涡来提高的推进效率 Daghooghi等[14] (2015) 数值模拟多条三维仿真鱼以矩形编队自主同步游动 同等能量消耗下集群游动的速度比单独游动快20%. 鱼间距离减小会提高游动方向的流体速度, 单靠流体动力相互作用足以产生高效的集群游动 Hemelrijk等[66] (2015),
Li 等[67] (2019)利用数值模拟研究了鱼群四种不同编队(串列、方阵、菱形和矩形)游动时的Froude效率 鱼集群游动比单独游动效率高, 但菱形队列并不是最优. 尾流和横向压力共同影响游动效率, 尾流主要影响推力, 横向压力主要影响功率损失 Dai等[72] (2018) 分别数值模拟了2、3和4条仿真鱼组成的编队自主游动, 并用运输成本来量化稳定编队的游动效率 与单独游动相比, 集群游动COT最多减少16%, 但相较于其他编队, 菱形编队并没有表现出任何节能优势, 说明被动水动力相互作用是节能的主要原因
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表 3 实验装置研究法的发展历程
Table 3 The development of the method of experimental setup research for fish schooling
作者 研究方法 主要结论 Dewey等[79-80]
(2013, 2014),
Boschitsch等[81] (2014)利用高速相机及DPIV观察分析两个仿生柔性水翼在并列与串列结构中的摆动 并联结构中同相摆动尾流形成涡对, 诱导动量喷流来提高水翼推进效率; 串联结
构中尾流形成相干模式, 后方水翼的效率最多可提高50%Becker等[83] (2015) 扑翼阵自主推进实验 仅通过流体动力学相互作用足以产生互相耦合的集群运动, 来提高推进效率 裴正楷等[84-85] (2016) 研究两条仿鲹科机器鱼并排运动 通过流体传导, 并排游动的机器鱼在特定相位差时可以相互促进, 提高运动效率
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表 4 三类研究方法特点对比
Table 4 Comparison of three kinds of research methods
对比项目 优点 缺点 鱼群观察分析法 反映真实鱼群游动情况 编队不易保持, 不易精确定量分析 计算流体力学仿真法 可精确定量分析, 模拟各种编队 不能反映真实的水动力学关系 实验装置研究法 可反映真实水动力学关系, 易保持队形, 可定量分析 无法完全模拟鱼游动过程, 对实验装置和平台要求较高
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