Efficiency at maximum power of motor traffic on networks

摘要

We study motor traffic on Bethe networks subject to hard-core exclusion forboth tightly coupled one-state machines and loosely coupled two-state machinesthat perform work against a constant load. In both cases we find aninteraction-induced enhancement of the efficiency at maximum power (EMP) ascompared to non-interacting motors. The EMP enhancement occurs for a wide rangeof network and single motor parameters and is due to a change in thecharacteristic load-velocity relation caused by phase transitions in thesystem. Using a quantitative measure of the trade-off between the EMPenhancement and the corresponding loss in the maximum output power we identifyparameter regimes where motor traffic systems operate efficiently at maximumpower without a significant decrease in the maximum power output due to jammingeffects.