25.5. Risk Assessment in HRI

• Identifying tasks that involve robot-human interaction • Assessing the potential for mechanical or software failure

The first step in risk assessment is hazard identification. This involves recognizing specific tasks where humans and robots interact. For instance, in a construction site, tasks that include a robot lifting heavy materials while humans are nearby must be identified. Additionally, it's critical to evaluate the potential for failures in both mechanical systems (like a robot’s arm that could malfunction) and software systems (where a glitch could make the robot move unexpectedly). By identifying these hazards, we can begin to understand where the risks arise.

Imagine you are planning a picnic and are concerned about potential hazards like bees or bad weather. Just like checking for these threats, in a work environment with robots, we must identify specific tasks where the robots could pose risks to humans.

• Evaluating the severity of potential injury • Probability of occurrence • Frequency and duration of exposure

After identifying hazards, the next step is risk estimation. This involves evaluating how severe an injury could be if an accident were to happen. For example, if a robot dropped a heavy load, could it cause serious injury? Additionally, we assess the likelihood of such an injury occurring and how often workers could be exposed to these hazards during their tasks. This is crucial for prioritizing safety measures based on the level of risk.

Think about how a lifeguard assesses the safety of a swimming pool. They consider how deep the water is (severity of injury), how many kids are playing (probability), and how many children are at the pool each day (exposure frequency). Similarly, risk estimation looks at how dangerous the environment can become due to robots.

• Design modifications • Additional sensors and controls • Administrative measures like training and signage

Once risks are identified and estimated, we move to risk reduction measures. This means making changes to either the robots or the environment to make it safer. For instance, design modifications could involve adding guards to robots to protect workers from moving parts. Additional sensors can detect human presence to prevent accidents, and administrative measures might include training workers about safe practices and placing signs in hazardous areas. Implementing these measures helps ensure a safer interaction between humans and robots.

Consider how construction sites have safety practices like hard hats, safety cones, and training sessions for workers. Just as these measures reduce risks of accidents, in HRI, modifications and training help protect workers from robots.

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