# A unified framework for soft inflatable fabric actuators

## TL;DR

This paper introduces a unified framework for modeling and designing soft inflatable fabric actuators, enabling efficient and scalable design for various applications.

## Contribution

A unified taxonomy and spring-based modeling framework for soft inflatable fabric actuators, enabling accurate prediction of complex actuator behavior.

## Key findings

- High-fidelity simulations validated experimentally show that complex actuator behavior can be inferred from a single unit.
- The framework allows task-specific actuator design without iterative prototyping or expensive modeling.
- The approach is applicable to wearable systems, robotic manipulation, biomedical devices, and adaptive structures.

## Abstract

Soft inflatable fabric actuators are gaining traction in soft robotics due to their lightweight, compliant structures and capacity for generating diverse motions. However, the increasing diversity and structural complexity of their designs present significant challenges for scalable modeling and predictive performance analysis. Here, we present a unified taxonomy of soft inflatable fabric actuators, built around a stiffening actuator as a fundamental unit cell. We introduce a spring-based modeling framework that captures the mechanical behavior of complex actuator types- including elongating, contracting, and bending— through modular combinations of individual units in series or parallel. High-fidelity finite element simulations, validated experimentally, show that the mechanical response of complex multi-chamber actuators can be accurately inferred from the behavior of a single unit. Two case studies demonstrate the framework’s practical utility for task-specific actuator design, eliminating the need for iterative prototyping or computationally expensive modeling. This scalable and generalizable approach enables efficient soft actuator design for a wide range of applications, including but not limited to wearable systems, robotic manipulation, biomedical devices, and adaptive or morphing structures.