HW5 - Safety Assessment

Your task is to perform a safety assessment of an application in a factory that assumes physical human-robot interaction.

Each student has a unique assignment, which can be found in BRUTE. To see the assignment, click on “your input data” in HW5 in BRUTE.

You are given a simulation that serves as a description of the application. Each assignment has its own additional requirements (see your assignment).

The tasks are the same for every assignment:

Create a safety evaluation of the application. The evaluation should include the following (the section and table numbers are taken from pHRI Methodology):

• Application analysis (Sec 3.1)
  • Answer all 6 questions
  • For yes/no question, provide also a short explanation why/from where/how
  • For properties of gripper/robot, cite a source of your information
    • e.g., “The maximum velocity of the robot is 1.5 m/s, which can be found in the UR10 documentation [1]”
• Safety analysis (Sec 3.2)
  • Answer the two questions
  • Create 5 possible hazards and provide safety evaluation for each of them
    • Use Risk Matrix (Table 1) or Pilz Hazard Rating (Equation 1)
      • The choice is yours. You can also use one for one hazard and the other for another hazard, or use both for all hazards…
    • Explain and justify your choice for every parameter of the selected evaluation method
      • e.g., severity and occurrence for Risk Matrix
      • write full sentence, e.g., “The severity of the hazard is High because it can cause a serious injury to a human worker, such as a broken arm or leg”
    • Based on the final risk, provide a safety measure and compute new risk after the measure
      • again, explain and justify your choice
    • At least 3 of the hazards must have the rating “worse” than negligible before you apply a safety measure
• Risk Reduction Analysis (Sec 3.3)
  • Answer the two questions

• Submit a PDF file with clear and readable content
  • it can be scanned written text, but the text must be easily readable
  • for risk analysis it is probably the best to use a table
  • if something will be hard to understand from the document, you will get no points for the given part
• Put number of your variant and printscreen (from BRUTE) of the simulation on the first page
• Try to describe and justify everything as best as you can. Otherwise, the lab tutor may reduce you score
• If you use methods like PFL or SSM to help with your analysis or as a measure. But you must provide a justification (usually a computation)
• For anything that can be found in the documentation of robot or gripper (e.g., max velocity of max force), cite the source where you found the information
• You can insert images/printscreens from the simulation if it helps with your analysis or justification

• 2 points for correct Application analysis
• 5 points for correct Safety analysis
  • more than 1 point can be reduced for 1 hazard if it contains a lot of mistakes or an apparent error
  • 0 points will be given if you don't provide at least 3 hazards with rating “worse” than negligible before measures
  • full points will be given only if the hazards are well described and justified
  • full point will be given only if the measures are well described and justified
  • full points will be given only if the hazards are diverse, i.e., cover more than one type of hazard
  • at least one hazard should work with the properties of the robot or gripper
    • otherwise, 0 points will be given
• 1 point for correct Risk Reduction analysis

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