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arxiv: 2605.20304 · v1 · pith:UDQ3GGO5new · submitted 2026-05-19 · 💻 cs.RO

Terrestrial Soft Mobile Robots: A Review

Pith reviewed 2026-05-21 02:15 UTC · model grok-4.3

classification 💻 cs.RO
keywords soft mobile robotsterrestrial locomotionsoft roboticsactuation methodscontrol systemslocomotion strategiesresearch challengeswheelless robots
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The pith

A review of soft mobile robots maps terrestrial locomotion without wheels and flags key barriers to adoption.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper reviews the state of soft mobile robots that move on land without relying on wheels. It surveys locomotion strategies, actuation methods, modeling techniques, and control systems developed so far. The authors also pinpoint major research challenges that stand in the way of using these robots in real applications such as search-and-rescue, surveillance, and manufacturing. By compiling past and current work into one overview, the review aims to serve as a starting point for researchers seeking to advance the field.

Core claim

The paper establishes that wheelless terrestrial soft mobile robots have progressed through diverse locomotion strategies, actuation approaches, modeling methods, and control architectures, yet persistent challenges in areas such as robustness, energy use, and scalability must be resolved before widespread practical deployment becomes feasible.

What carries the argument

The central organizing mechanism is the division of the field into locomotion strategies, actuation methods, modeling approaches, and control systems, which the review uses to catalog developments and surface open problems.

If this is right

  • Addressing the listed challenges would allow soft robots to operate reliably in unstructured outdoor environments for search-and-rescue tasks.
  • Better actuation and control methods would expand use in service and surveillance roles where gentle interaction with surroundings matters.
  • Improved modeling would speed up the design cycle for soft robots intended for manufacturing or exploration settings.
  • Resolving these issues could accelerate transition from laboratory prototypes to field-ready systems.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The review's structure could guide experiments that directly compare locomotion strategies under identical terrain conditions to quantify trade-offs.
  • Connections between the highlighted challenges and emerging soft-material fabrication techniques remain open for future targeted studies.
  • The catalog of control approaches might inform hybrid systems that combine soft bodies with minimal rigid components for added precision.

Load-bearing premise

The review assumes that the papers it selected represent the full current state of the field and that the challenges it highlights are the most important ones blocking adoption.

What would settle it

A later survey that incorporates a substantial set of omitted papers or demonstrates that different unlisted challenges are more decisive would undermine the review's claim to comprehensive coverage.

Figures

Figures reproduced from arXiv: 2605.20304 by Dimuthu D. K. Arachchige.

Figure 1
Figure 1. Figure 1: Classification of soft mobile robots highlighting the scope of this [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Summary of the topics discussed in this review. [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Distribution of research papers on soft mobile robots from 1996 to 2024, as considered in this review article. [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: State-of-the-art wheelless terrestrial soft-limbed robots: (A) "Tetraflex" tetrahedral robot that replicates multimodal locomotion [ [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: State-of-the-art wheelless terrestrial soft-bodied robots: (A) wheelless soft robotic snake in [ [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (A) Dividing actuator into a finite number of elements (i.e. a [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Left: A soft actuator of the pneumatically-powered tetrahedral robot in [PITH_FULL_IMAGE:figures/full_fig_p011_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Representative locomotion trajectory generation methods: Robots that replicate bioinspired (A) pinniped [ [PITH_FULL_IMAGE:figures/full_fig_p012_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Representative control methods: (A) Open loop control method employed by the soft crawler in [ [PITH_FULL_IMAGE:figures/full_fig_p015_9.png] view at source ↗
read the original abstract

Soft mobile robots have emerged as a promising area of research with potential applications in various disciplines including but not limited to search-and-rescue, service, surveillance, explorations, and manufacturing. In this article, we provide a comprehensive review of the current state of soft mobile robot research, focusing on wheelless terrestrial locomotive systems. We include past and present developments in locomotion strategies, actuation methods, modeling approaches, and control systems. Further, we identify key research challenges that must be overcome to enable the widespread adoption of soft mobile robots in various applications. Overall, this article provides a valuable resource for researchers and practitioners interested in the field of soft mobile robots and soft robotics.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. This review article surveys past and present developments in terrestrial soft mobile robots with a focus on wheelless locomotion. It organizes the literature around locomotion strategies, actuation methods, modeling approaches, and control systems, and concludes by identifying key research challenges that must be addressed for broader adoption in applications such as search-and-rescue and exploration.

Significance. A well-structured review that accurately synthesizes the cited works could provide a useful entry point for researchers entering the soft robotics field and help consolidate knowledge on locomotion and actuation trade-offs. The manuscript's value hinges on whether the selected body of work is representative; the current presentation leaves this untestable.

major comments (1)
  1. The manuscript provides no explicit literature-search protocol (databases, keywords, date ranges, or inclusion/exclusion criteria). Because the central claim is that the review is comprehensive and identifies the most critical challenges, the absence of a methods section makes the representativeness of the cited literature impossible to assess and constitutes a load-bearing weakness.
minor comments (2)
  1. The abstract states the scope is limited to 'wheelless terrestrial locomotive systems' yet the title is 'Terrestrial Soft Mobile Robots: A Review'; a brief clarification of scope boundaries in the introduction would help readers.
  2. Several figures (e.g., those summarizing actuation mechanisms) would benefit from consistent caption formatting and explicit citation of the original sources for each illustrated robot.

Simulated Author's Rebuttal

1 responses · 0 unresolved

Thank you for the opportunity to respond to the referee's report on our manuscript 'Terrestrial Soft Mobile Robots: A Review'. We appreciate the constructive criticism and have prepared a point-by-point response to the major comment. We plan to make revisions to address the identified weakness.

read point-by-point responses
  1. Referee: The manuscript provides no explicit literature-search protocol (databases, keywords, date ranges, or inclusion/exclusion criteria). Because the central claim is that the review is comprehensive and identifies the most critical challenges, the absence of a methods section makes the representativeness of the cited literature impossible to assess and constitutes a load-bearing weakness.

    Authors: We concur that documenting the literature search methodology is essential for establishing the scope and representativeness of a review article. Our review was compiled through a thorough examination of the existing literature on soft mobile robots, utilizing major academic search engines and focusing on peer-reviewed publications and key conference proceedings from the past two decades. However, we acknowledge that an explicit protocol was not provided in the original submission. In the revised manuscript, we will add a 'Literature Search Methodology' section that specifies the databases (such as IEEE Xplore, ScienceDirect, and Google Scholar), the primary keywords employed (including 'soft robot', 'terrestrial locomotion', 'soft mobile robot', 'wheelless robot'), the date range (approximately 2000 to present), and the inclusion criteria (e.g., relevance to wheelless terrestrial locomotion, actuation, modeling, and control). Exclusion criteria will also be noted, such as works focused solely on aquatic or aerial soft robots. This revision will enable readers to better evaluate the comprehensiveness of our survey. revision: yes

Circularity Check

0 steps flagged

No circularity: review draws exclusively on external literature

full rationale

This is a narrative literature review with no equations, fitted parameters, predictions, or derivation chain. All content is presented as summaries of prior external work on locomotion, actuation, modeling, and control. The representativeness assumption is an untestable selection choice rather than a self-referential reduction; no step equates a claimed result to its own inputs by construction. The paper is self-contained against external benchmarks via citations to independent sources.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a literature review the central claim rests on the authors' selection and synthesis of previously published work rather than new free parameters, axioms, or invented entities.

pith-pipeline@v0.9.0 · 5630 in / 1084 out tokens · 32909 ms · 2026-05-21T02:15:14.076689+00:00 · methodology

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Reference graph

Works this paper leans on

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