Untangle your hair with help from robots: Personal care robots could help...
Untangle your hair with help from robots: Personal care robots could help reduce time nurses spent on direct patient care tasks.
Source: MIT Computer Science & Artificial Intelligence Lab
07.05.2021 •

The “RoboWig” untangle your hair

With rapidly growing demands on health care systems, nurses typically spend 18 to 40 percent of their time performing direct patient care tasks, oftentimes for many patients and with little time to spare. Personal care robots that brush your hair could provide substantial help and relief.

This may seem like a truly radical form of “self-care,” but crafty robots for things like shaving, hair washing, and make-up are not new. In 2011, the tech giant Panasonic developed a robot that could wash, massage, and even blow dry hair, explicitly designed to help support “safe and comfortable living of the elderly and people with limited mobility, while reducing the burden of caregivers.”

Hair combing bots, however, proved to be less explored, leading scientists from MIT’s Computer Science and Artificial Intelligence Laboratory (CSAIL) and the Soft Math Lab at Harvard University to develop a robotic arm setup with a sensorized soft brush, equipped with a camera that helps the arm “see” and assess curliness, to let the system plan a delicate and time-efficient brush-out.

Their control strategy is adaptive to the degree of tangling in the fiber bunch, and they put “RoboWig” to the test by brushing wigs ranging from straight to very curly hair.

While the hardware set-up of “RoboWig” looks futuristic and shiny, the underlying model of the hair fibers is what makes it tick. CSAIL postdoc Josie Hughes and her team’s approach examined entangled soft fiber bundles as sets of entwined double helices - think classic DNA strands. This level of granularity provided key insights into mathematical models and control systems for manipulating bundles of soft fibers, with a wide range of applications in the textile industry, animal care, and other fibrous systems.

RoboWig could also potentially assist with, in pure “Lady and the Tramp'' fashion, efficiently manipulating spaghetti. “By developing a model of tangled fibers, we understand from a model-based perspective how hairs must be entangled: starting from the bottom and slowly working the way up to prevent 'jamming' of the fibers,” says Hughes, the lead author on a paper about RoboWig. “This is something everyone who has brushed hair has learned from experience, but is now something we can demonstrate through a model, and use to inform a robot.”

Split ends

This task at hand is a tangled one. Every head of hair is different, and the intricate interplay between hairs when combing can easily lead to knots. What’s more, if the incorrect brushing strategy is used, the process can be very painful and damaging to the hair.

Previous research in the brushing domain has mostly been on the mechanical, dynamic and visual properties of hair, as opposed to RoboWig’s refined focus on tangling and combing behavior.

To brush and manipulate the hair, the researchers added a soft-bristled sensorized brush to the robot arm, to allow forces during brushing to be measured. They combined this setup with something called a “closed-loop control system”, which takes feedback from an output and automatically performs an action without human intervention. This created “force feedback” from the brush -- a control method that lets the user feel what the device is doing -- so the length of the stroke could be optimized to take into account both the potential “pain”, and time taken to brush.

Initial tests preserved the human head - for now - and instead were done on a number of wigs of various hair styles and types. The model provided insight into the behaviors of the combing, related to the number of entanglements, and how those could be efficiently and effectively brushed out by choosing appropriate brushing lengths. For example, for curlier hair, the pain cost would dominate, so shorter brush lengths were optimal.

The team wants to eventually perform more realistic experiments on humans, to better understand the performance of the robot with respect to their experience of pain - a metric that is obviously highly subjective, as one person’s “two” could be another’s “eight.”

“To allow robots to extend their task solving abilities to more complex tasks such as hairbrushing, we need not only novel safe hardware, but also an understanding of the complex behavior of the soft hair and tangled fibers,” says Hughes. “In addition to hair brushing, the insights provided by our approach could be applied to brushing of fibers for textiles, or animal fibers.”

Subscribe to our newsletter

Related articles

Simulator helps robots sharpen their cutting skills

Simulator helps robots sharpen their cutting skills

A simulation engine predicts the forces acting on a knife as it cuts through soft materials, a capability that could have applications for safer surgical robotics.

Robotic neck brace to analyze cancer treatment impacts

Robotic neck brace to analyze cancer treatment impacts

Researchers have developed a robotic neck brace that may help doctors analyze the impact of cancer treatments on the neck mobility of patients and guide their recovery.

A 3D printed multifunctional pressure sensor

A 3D printed multifunctional pressure sensor

The 3D printed pressure sensor embedded with a temperature sensor is low-cost and scalable to large-scale production of smart robotic systems.

A contact aware robot design

A contact aware robot design

Researchers have developed a new method to computationally optimize the shape and control of a robotic manipulator for a specific task.

Robot helps people with limited mobility get dressed

Robot helps people with limited mobility get dressed

Scientists have developed an algorithm to help a robot find efficient motion plans to ensure physical safety of its human counterpart.

Tuning collagen threads for biohybrid robots

Tuning collagen threads for biohybrid robots

Researchers are taking steps to incorporate actual muscles or neurons into a robotic system.

Companion robot to support primary care providers

Companion robot to support primary care providers

Intuition Robotics announced a significant expansion of ElliQ, their AI-driven companion robot, to enable the extension of primary care teams' presence into older adults' homes.

Speedy nanorobots could someday deliver drugs

Speedy nanorobots could someday deliver drugs

Minuscule, self-propelled particles called “nanoswimmers” can escape from mazes as much as 20 times faster than other, passive particles, paving the way for their use in medication delivery.

Magnetic fields controll miniature robots

Magnetic fields controll miniature robots

Scientistshave developed millimeter-sized robots that can be controlled using magnetic fields to perform highly maneuverable and dexterous manipulations.

Popular articles

Subscribe to Newsletter