Home Forums ROV ROV Technical Discussions Designing a New Motion Reference Unit

Designing a New Motion Reference Unit

Home Forums ROV ROV Technical Discussions Designing a New Motion Reference Unit

Viewing 3 posts - 1 through 3 (of 3 total)
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  • #2113
    ph
    Participant

    I would like to get your input into a new motion reference unit (MRU) I am working on. Below is a list of questions that would help me understand your requirements. Your help with this is much appreciated.

    1. What features do you like the most in your current MRU?
    2. What are the top 3 improvements you would like to see in your MRU?
    3. How would you rank the following possible MRU buying criteria? (1 important to 5 not important)
            Drift
            Accuracy
            Cost
            Size
            Power consumption
            Depth rating

    4. What communications protocol would you like for your application?
    5. What is the maximum angular rotation rate that you would like to measure?
    6. What is the maximum acceleration that you would like to measure?
    7. What pitch, roll and heading accuracy do you require?
    8. What is the maximum size of the MRU for your application?
    9. What input voltage range do you require?
    10. What is the maximum power consumption for your application?
    11. Which of the following would you prefer: 
    a) board-level product that could be installed in your application
    b) a MRU in a depth rated cylindrical enclosure (what depth rating?)

    #21462
    Savante
    Participant

    hey, sounds interesting at least….

    a good Idea might be to look at industry standard packages like the Ixsea octans or phins package and offload the specs from that. As a rule of thumb, people here don’t really like change, so a plug n play replacement is prob best idea and matching spec of existing systems. (This is because if you are writing a tender application, you need to specify a survey spread that is consistent with established practise and if you are the ROV supervisor you don’t want to have to spend time changing out equipment from job to job).

    What sort of resolution and drift can you achieve at the moment, are you looking at a high-quality survey-grade system or a low-cost, low quality system? There are cheaper alternatives like the FOG from Tritech. Don’t know anything about it’s performance.

    If you are looking for buyers and answer to 11. a) If you have a good product, consider approaching someone like sub-atlantic for OEM supply? but by n large you want to have a pressure housing for your gear so that the system can be mobbed/demobbed from system to system without having to loose time on preparations. RS232 is a good protocol if you have a large work-class with fibre optic mux and it’s easy to read with a laptop for diagnostics, but people are happy with 485 or even ethernet protocols. USB 2 is emerging recently.

    #21463
    ph
    Participant

    I am currently looking at a low cost system, resolution should be at least 0.1 deg and accuracy < 0.5 deg. It would be designed for the inspection class ROV market. I am currently in the process of testing drift.

    Thank you very much for your suggestions.

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