---
title: "Constant Tension Winch (for passive systems)"
industry: "Other Transport Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CONSTANT_TENSION_WINCH_FOR_PASSIVE_SYSTEMS"
  data_integrity_hash: "8c275d5c0ef8c2ed4448f84b6457cb5d"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:CONSTANT_TENSION_WINCH_FOR_PASSIVE_SYSTEMS"
  data_source_uri: "https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/constant-tension-winch-for-passive-systems.md"
  official_resource_url: "https://cnfx.com/industry/other-transport-equipment-manufacturing/product/constant-tension-winch-for-passive-systems"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "5-150 kN tension range, 0.1-2 m/s line speed, -20°C to +60°C ambient temperature"
    unit: "kN"
engineering_limits:
  max_safe_operating_point:
    value: 180
    unit: "kN"
    consequence: "Plastic deformation of drum shaft due to combined torsional and bending stresses exceeding yield strength of 4140 steel (415 MPa)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosion-induced pitting on cable contact surfaces"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "316L stainless steel drum surface with 0.8 μm Ra finish and cathodic protection at -850 mV vs Ag/AgCl"
  - node_2:
      trigger: "Worm gear backlash accumulation exceeding 0.15° angular displacement"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dual preloaded angular contact bearings with 0.02 mm axial clearance and tapered worm gear design"
bom_nodes:
  drum-assembly:
    type: "part"
    urn: "URN:CNFX:ME:DRUM_ASSEMBLY"
    interface_type: "physical-logic-coupled"
  tension-sensing-mechanism:
    type: "part"
    urn: "URN:CNFX:ME:TENSION_SENSING_MECHANISM"
    interface_type: "physical-logic-coupled"
  hydraulic-accumulator:
    type: "part"
    urn: "URN:CNFX:ME:HYDRAULIC_ACCUMULATOR"
    interface_type: "physical-logic-coupled"
  braking-system:
    type: "part"
    urn: "URN:CNFX:ME:BRAKING_SYSTEM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 4308-1:2018 - CRANES AND LIFTING APPLIANCES - SELECTION OF WIRE ROPES"
    scope: "Verified Engineering Specification"
  - standard: "DIN 15020-1:1974 - CRANES; PRINCIPLES RELATING TO ROPE DRIVES; CALCULATION AND CONSTRUCTION"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/constant-tension-winch-for-passive-systems.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "4e54097b8a8fb652a69a665305627a941d09c80f8707b9802e3a1041e008c62f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Constant Tension Winch (for passive systems)

## 1. Technical Definition
A winch mechanism designed to maintain constant tension on cables or lines in passive heave compensation systems, compensating for vertical vessel motion without active power input.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **5-150 kN tension range, 0.1-2 m/s line speed, -20°C to +60°C ambient temperature**. Failure boundary: **Tension exceeds 180 kN (120% of rated capacity) or line speed exceeds 2.5 m/s (125% of rated speed)**, Mechanism: **Plastic deformation of drum shaft due to combined torsional and bending stresses exceeding yield strength of 4140 steel (415 MPa)**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosion-induced pitting on cable contact surfaces | 8 | Cable slippage and tension loss exceeding 15% of setpoint | 316L stainless steel drum surface with 0.8 μm Ra finish and cathodic protection at -850 mV vs Ag/AgCl |
| Worm gear backlash accumulation exceeding 0.15° angular displacement | 8 | Tension oscillation with ±8% amplitude at 0.5-2 Hz frequency | Dual preloaded angular contact bearings with 0.02 mm axial clearance and tapered worm gear design |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | kN | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Drum Assembly](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/drum-assembly.md) `(Standalone System)`
- [Tension Sensing Mechanism](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/tension-sensing-mechanism.md) `(Standalone System)`
- [Hydraulic Accumulator](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/hydraulic-accumulator.md) `(Standalone System)`
- [Braking System](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/braking-system.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Control System Cabinet**, **Cable Tension Monitoring System**  
**Downstream Applications**: Offshore Mooring Systems, Marine Research Vessels, Subsea Cable Laying Equipment  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: How does this constant tension winch work in passive systems?
**A**: It uses a hydraulic accumulator and tension sensing mechanism to automatically adjust cable tension in response to vessel motion, maintaining constant load without external power input.

### Q: What materials make this winch suitable for marine environments?
**A**: Constructed from high-strength alloy steel, marine-grade aluminum, and corrosion-resistant coatings to withstand harsh saltwater conditions and ensure long-term durability.

### Q: What maintenance does the braking system require?
**A**: The braking system is designed for minimal maintenance with self-adjusting mechanisms, though regular inspections for wear and proper lubrication are recommended per manufacturer guidelines.

## 6. Manufacturing Compliance
- ISO 4308-1:2018 - CRANES AND LIFTING APPLIANCES - SELECTION OF WIRE ROPES
- DIN 15020-1:1974 - CRANES; PRINCIPLES RELATING TO ROPE DRIVES; CALCULATION AND CONSTRUCTION

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Constant Tension Winch (for passive systems)](https://cnfx.com/industry/other-transport-equipment-manufacturing/product/constant-tension-winch-for-passive-systems)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: CONSTANT_TENSION_WINCH_FOR_PASSIVE_SYSTEMS | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 65a42b1b
