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·µ»ØµÄÒâ¼ûÈçÏ£¬Çë¸÷λȺÓѶàÌáÌáÈçºÎÐÞ¸ÄÎÄÕµÄÒâ¼û£¬µÚÒ»´ÎͶӢÎÄÆÚ¿¯£¬Ã»¾Ñ飬ллÁË£¡ The paper investigats the consensus for multiagent systems with delays via the use of Nyquist criterion and frequency-domain analysis. Overall, this is an interesting work with nice organization. Technical proof is sound as well. There are some comments for the authors to consider. -As is well known in MAS community, multi-agent consensus problem with delay (various delays including input delay, coupling delay, random communication delay, etc) involved has been systematically investigated in different settings. The followings are some works which have been missed by the authors but need to be commented/compared with their work as they relate closely to the investigated topic. Note that Ref. [1] also considers different delays for agents with single-integrator dynamics in continuous-time setting; and Refs. [5] & [4] consider respectively the communication delay (non-uniform and time-varying delays) for single-integrator and double-integrator agents in sampled-data setting. Ref. [2] considers the input delay for single-integrator agents in continuous setting with switching communication topologies and Ref. [4] considers the double-integrator case. [1] Delay Robustness in Consensus Problems. Automatica, 46(8): 1252-1265, 2010. [2] On average consensus in directed networks of agents with switching topology and time delay. International Journal of Systems Science 42(12): 1947-1956, 2011 [3] Second-order consensus for multi-agent systems with switching topology and communication delay. Systems & Control Letters 60(6): 390-397, 2011 [4] A sufficient condition for convergence of sampled-data consensus for double-integrator dynamics with nonuniform and time-varying communication delays, IEEE Transactions on Automatic Control, DOI: 10.1109/TAC.2012.2188425, 2012 [5] State consensus for multi-agent systems with switching topologies and time-varying delays. International Journal of Control, 79(10): 1277-1284, 2006 Other comments: - What does it mean by connected as mentioned in the bottom 3 lines on page 3 (see, "... the minimum requirement of digraph G is said to be connected is ...." ? |
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