Type of Document Master's Thesis Author Liu, Mingyi Author's Email Address firstname.lastname@example.org URN etd-09282016-122342 Title Evaluation of a Simple Model for the Acoustics of Bat Swarms Degree Master of Engineering Department Mechanical Engineering Advisory Committee
Advisor Name Title Rolf Mueller Committee Chair Andrew Kurdila Committee Member Nicole Abaid Committee Member Keywords
- Bat swarm
Date of Defense 2016-09-15 Availability unrestricted AbstractBats using their biosonar while flying in dense swarms may face significant bioacoustic
challenges, in particular mutual sonar jamming. While possible solutions to the jamming
problem have been investigated multiple times in literature, the severity of this problem has
received far less attention. To characterize the acoustics of bat swarms, a simple model of
the acoustically relevant properties of a bat swarm has been set up and evaluated. The
model contains only four parameters: bat spacial density, biosonar beamwidth, duty cycle,
and a scalar measure for the smoothness of the flight trajectories. In addition, a threshold
to define substantial jamming was set relative to the emission level. The simulations results
show that all four model parameters can have a major impact on jamming probability.
Depending on the combination of parameter values, situations with or without substantial
jamming probabilities could be produced within reasonable ranges of all model parameters.
Hence, the model suggests that not every bat swarm does necessarily impose grave jamming
problem. A fitting process was introduced to describe the relationship between the four
parameters and jamming probability, hence produce a function with jamming probability as
output and four parameters as input. Since the model parameters should be comparatively
easy to estimate for actual bat swarms, the simulation results could give researchers a way
to assess the acoustic environment of actual bat swarms and determine cases where a study
of biosonar jamming could be worthwhile.
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