Project: Hypergravity Habitat
Document type: technology-neutral system requirements
Status: working document for pre-feasibility review
Scope: scientific, engineering, safety, operational, medical, biological, and programme requirements for candidate hypergravity research infrastructure
This document defines technology-neutral requirements for evaluating Hypergravity Habitat concepts. It is intended to prevent premature architecture selection and to provide a common basis for comparing railway, maglev, rotating, hybrid, and payload-only demonstrator concepts.
The requirements are not final specifications. They are a pre-feasibility framework that should be refined through literature review, modelling, expert consultation, and demonstrator testing.
The central rule is:
A design concept is only credible if it can be traced back to a scientific requirement and evaluated against safety, controllability, reproducibility, and operational feasibility.
Requirements should be classified by maturity.
| Level | Meaning |
|---|---|
| Mandatory requirement | Required for safety, scientific validity, or governance |
| Target requirement | Desired performance for a useful system |
| Trade requirement | Can be optimized against cost, complexity, or scope |
| Unknown requirement | Requires research before a value can be set |
| Stage-specific requirement | Applies only to a demonstrator, payload platform, or human-rated system |
This classification is important because early demonstrators should not be burdened with full habitat requirements.
The project should define requirements separately for each stage.
| Stage | Description | Requirement emphasis |
|---|---|---|
| Stage 0 | literature review and modelling | equations, evidence map, requirements definition |
| Stage 1 | instrumented physics demonstrator | acceleration, vibration, control, data quality |
| Stage 2 | biological payload demonstrator | environmental control, sample handling, reproducibility |
| Stage 3 | short human tolerance study | medical governance, safety, monitoring |
| Stage 4 | repeated or medium-duration exposure | habitability, recovery, operations |
| Stage 5 | long-duration habitat-scale research | full safety case, logistics, emergency systems |
Human-habitation requirements should not be applied to Stage 1 or Stage 2 unless they are explicitly needed.
The system shall define and measure the effective gravity environment experienced by the payload or participant.
Required documentation:
Experiments shall be repeatable under comparable conditions.
Minimum requirements:
The system shall support exposure durations appropriate to the research question.
Examples:
The project should allow comparison between at least two effective-gravity conditions over time. This may be achieved by speed variation, radius variation, payload position, different demonstrators, or staged infrastructure.
The system shall monitor variables that could confound scientific interpretation.
Minimum variables:
Each concept shall provide equations and assumptions for:
The platform shall maintain acceleration within defined tolerances for the intended experiment class. Tolerances remain open until payload requirements are defined.
Mechanical vibration shall be measured continuously and reduced to levels compatible with the experiment class.
This is mandatory because vibration can be a biological, physiological, and instrument confounder.
The platform shall control or measure environmental variables relevant to the experiment.
Examples:
The system should support operation long enough for the intended protocol. Maintenance needs shall be documented as part of the experiment plan.
Every concept shall define a safe state after power loss, control failure, guideway fault, fire, medical emergency, or environmental-control failure.
Biological payloads may be the most credible early science pathway.
Minimum requirements:
Additional requirements may include:
Human-subject requirements apply only to stages involving people.
Mandatory requirements:
Human studies shall begin with conservative exposure durations and low-risk participant groups. Long-duration habitation shall not be considered an early-stage requirement.
For any medium- or long-duration human study, the environment must support health, safety, and scientific validity.
Potential requirements:
Quantitative values remain undefined and should be derived from analogue-habitat, clinical, occupational, and human-factors literature.
The system should define procedures for:
Each operational event should be logged because it may affect scientific interpretation.
Safety requirements apply to all stages, including payload-only tests.
Mandatory topics:
For moving or rotating platforms, additional topics include:
The project should be financially staged.
Requirements:
A full-scale facility should not be proposed before a pre-feasibility study and demonstrator evidence justify it.
| Criterion | Importance | Notes |
|---|---|---|
| Scientific usefulness | high | primary justification |
| Safety | high | mandatory for all stages |
| Measurement quality | high | determines scientific validity |
| Reproducibility | high | required for reviewable science |
| Environmental control | high | especially for biology and humans |
| Technical feasibility | high | concept must be buildable at the stage proposed |
| Maintainability | medium-high | critical for long exposure |
| Cost realism | medium-high | required for funding credibility |
| Scalability | medium | useful but not required for first demonstrator |
| Habitability | stage-dependent | not required for payload-only phases |
| Upgrade potential | medium | should not override near-term validity |
The following values remain open:
These should be converted into quantitative requirements only after literature review, modelling, and expert feedback.
Every future design document should include a requirements traceability table:
| Requirement ID | Design response | Evidence or assumption | Verification method | Status | |—|—|—|—|—|
This will make the repository more suitable for academic review and funding discussions.
The Hypergravity Habitat project should remain requirements-led. The first objective is not to choose between railway, maglev, rotating, or hybrid concepts. The first objective is to define what scientific questions require, what safety allows, and what demonstrators can verify.
This document should be updated whenever the research gap, physics model, experimental plan, or safety analysis changes.