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Reference : UMR5506-SERBER-008
Workplace : MONTPELLIER
Date of publication : Tuesday, December 17, 2019
Type of Contract : FTC Technical / Administrative
Contract Period : 6 months
Expected date of employment : 15 February 2020
Proportion of work : Full time
Remuneration : 2399€ à 2786€ depending on experience
Desired level of education : Engineer
Experience required : Indifferent
The main mission is to design some mechanical developments associated with the survival brand tag.
In order for the tag to have the least possible impact on the animal, it must behave optimally in the water when towed by the animal. The recruited engineer will focus on the "Hydrodynamics" part of the tag to propose an optimal shape in this context.
A second crucial element is the grip on the fish. Usually the hook is made with a rather invasive anchor. The engineer will be asked to study possible alternative solutions for hanging (e. g. inspired bio).
Finally, the engineer will work on the mechanical resistance part of the brand to water pressure (pressure < 50bars).
The main axis will be the study hydrodynamics of the tag. The engineer will use literature, theoretical study and simulations to define the most optimal shape for the tag. Finally, prototypes will be made which will be tested on several devices: in swimming lanes, towed by a boat, on tuna in tanks.
The hooked part in the fish will be studied as a group in the team. The mechanical engineer will be there to validate or invalidate the ideas for solutions proposed from a mechanical point of view.
For the pressure resistance study, the engineer will use tests already carried out in hyperbaric chambers on resin-coated devices to guide the studies towards the most viable solutions
The candidate must have an engineering or equivalent (including MASTER II) or a PhD.
He must have skills in:
- mechanical systems design
- mechanical systems simulation
- have knowledge of hydrodynamics.
The survival of animals after capture is becoming a major issue in fisheries management, both internationally and nationally. Indeed, the ecosystem impact of by-catch and incidental catches during professional or recreational fishing operations is significant. To provide scientific information on post-release mortality of accessory species, an interesting approach is to tag individuals before release with monitoring devices. These marks are intended to verify the survival of the released animal.
As part of the IOT and RELEASE projects, CNRS LIRMM and IFREMER are collaborating to develop new generation "low cost" tag based on LoRa technology. They will be equipped with sensors that record relevant information to estimate the animal's survival (e.g. accelerometer, pressure).
In the RELEASE project, the target species are species that do not return to the surface. Once deployed on the individual, the tags will collect data and then have to detach themselves from the animal to come to the surface in order to transmit the information either after a programmed time or upon its death. An embedded algorithm will process the data on the beacons to transmit only survival or death information. Data recovery will be carried out through a network of receiving stations.
These tags must be particularly small in order not to increase the animal's stress, to have a system for analyzing the animal's condition or even detecting its death and dropping it to detach it to the surface after a predefined time sufficient to establish a reliable diagnosis on the condition of the released animal.
The engineer will be located at the LIRMMM in Montpellier, which is a laboratory of more than 450 people.
Constraints and risks
No particular constraints. The presence is daily at office hours.
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