Researchers from St. Olaf College and Syracuse University in the US have unveiled a computer that functions entirely through mechanical parts.
In a world obsessed with smaller chips and faster charging, a team of scientists just went in the opposite direction. They built a computer out of springs.
Researchers from St. Olaf College and Syracuse University in the US have developed a mechanical computing system that eliminates the need for external power. It finds its intelligence in the tension of springs and the movement of steel.
These battery-free machines perform logic and memory tasks using physical components, and could offer an alternative to electronic processors.
Compared with conventional electronics, these machines rely on the “memory” inherent in physical materials .
Computer that runs on a pull
The project was born from a simple observation about the physical world.
“We typically think of memory as something in a computer hard drive, or within our brains,” said Joey Paulsen, Associate Professor of Physics at St. Olaf College. “However, many everyday materials retain some kind of memory of their past—for example, rubber can ‘remember’ how far it has been squeezed or stretched in the past. The research team wanted to understand if we could use everyday materials to not only remember movement but also process information—or compute,” Paulsen added.
Based on physical memory, the team engineered a trio of mechanical systems made from steel bars and springs. These devices perform specific computational tasks: one acts as a counter for physical pulls, another functions as a logic gate to distinguish between odd and even inputs, and the third serves as a gauge that retains a memory of applied force. Together, these demonstrate that complex information processing can occur through structural movement rather than electrical signals.
“We now have a rational way of building these machines that can perform simple computations without a computer chip or a power source,” Paulsen said.
Long road ahead
It sounds like a step backward, but the implications are futuristic. Silicon chips are delicate. These chips melt in extreme heat, glitch in high radiation, and corrode in harsh chemical vats. These mechanical computers are built for durability, functioning in environments that would otherwise destroy other hardware systems. For instance, in the future, there could be a prosthetic limb that feels and reacts to pressure without a battery pack, or a sensor inside a jet engine that tracks wear and tear using nothing but the engine’s vibration.
“Our results are one step toward designing materials that can sense their environment, make a decision, and then respond,” said Paulsen. “Frequently called smart materials, what we learned could help improve people’s lives by having more responsive artificial limbs or tactile rooms.”
To push the technology forward, Paulsen is shifting the focus toward the scalability and limits of these mechanical systems. Currently, students at St. Olaf are investigating how multiple rotors interact and influence one another, which could lead to the creation of more complex networks. This ongoing work aims to evolve these individual components into sophisticated, multi-part machines.
The findings were published in the journal Nature Communications.
Computer Inventions And Machines Mechanical Computer Springs
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