Agent skill

Damperengineering

Hydraulic damper design engineering for customer applications. Mechanical and hydraulic engineering, materials selection (aluminium/steel), seal/O-ring design, DSSV valve specification. USE WHEN user says 'damper design', 'application engineering', 'damper spec', 'customer application', 'damping curve', 'valve sizing', 'seal design', 'O-ring', 'slyde ring', or needs to capture customer damper requirements.

View SKILL.md on GitHub Repository
Stars 0
Forks 0

Install this agent skill to your Project

npx add-skill https://github.com/robdtaylor/personal-ai-infrastructure/tree/main/skills/DamperEngineering

SKILL.md

DamperEngineering

Hydraulic damper design engineering skill for customer application capture and specification. Combines mechanical engineering, hydraulic design, materials expertise, and sealing technology for DSSV-based damper solutions.

Workflow Routing

Workflow Trigger File
ApplicationCapture "new customer", "application requirements" Workflows/ApplicationCapture.md
DampingDesign "damping curve", "force-velocity" Workflows/DampingDesign.md
MaterialSelection "material", "aluminium", "steel" Workflows/MaterialSelection.md
SealDesign "O-ring", "seal", "slyde ring" Workflows/SealDesign.md
ValveSpecification "valve sizing", "DSSV spec" Workflows/ValveSpecification.md

Core Engineering Disciplines

1. Hydraulic Engineering

Damper Hydraulics Fundamentals:

┌─────────────────────────────────────────────────────────┐
│              DAMPER HYDRAULIC CIRCUIT                   │
├─────────────────────────────────────────────────────────┤
│                                                         │
│   COMPRESSION STROKE                                    │
│   ┌─────────────┐                                       │
│   │    Rod      │ ↓ Velocity                           │
│   │    ────     │                                       │
│   │   Piston    │ → Pressure builds below piston       │
│   │    ════     │                                       │
│   │             │ → Oil forced through valve ports     │
│   │   ┌───┐     │                                       │
│   │   │ V │     │ ← Compression valve controls flow    │
│   │   └───┘     │                                       │
│   └─────────────┘                                       │
│                                                         │
│   F = ΔP × A    (Force = Pressure drop × Piston area)  │
│   Q = V × A     (Flow = Velocity × Annular area)       │
│                                                         │
└─────────────────────────────────────────────────────────┘

Key Hydraulic Relationships:

Parameter Formula Units
Damping force F = C × v^n N
Flow rate Q = A × v m³/s
Pressure drop ΔP = f(Q, orifice) Pa
Reynolds number Re = (ρ × v × D) / μ dimensionless
Valve coefficient Cv = Q × √(SG/ΔP) varies

Flow Regimes:

Re Regime Damping Characteristic
< 2000 Laminar Linear (F ∝ v)
2000-4000 Transition Mixed
> 4000 Turbulent Quadratic (F ∝ v²)

2. Mechanical Engineering

Load Path Analysis:

┌─────────────────────────────────────────────────────────┐
│              DAMPER LOAD PATH                           │
├─────────────────────────────────────────────────────────┤
│                                                         │
│   Vehicle Body                                          │
│        │                                                │
│        ▼                                                │
│   ┌─────────────┐                                       │
│   │  Top Mount  │ ← Bearing/bushing loads              │
│   │  (M10-M12)  │                                       │
│   └──────┬──────┘                                       │
│          │                                              │
│   ┌──────┴──────┐                                       │
│   │  Piston Rod │ ← Tension/compression, bending       │
│   │  (Ø16-25mm) │    Column buckling check             │
│   └──────┬──────┘                                       │
│          │                                              │
│   ┌──────┴──────┐                                       │
│   │   Piston    │ ← Pressure differential loads        │
│   │  (Ø30-50mm) │                                       │
│   └──────┬──────┘                                       │
│          │                                              │
│   ┌──────┴──────┐                                       │
│   │    Tube     │ ← Hoop stress, thread loads          │
│   │  (Ø40-60mm) │                                       │
│   └──────┬──────┘                                       │
│          │                                              │
│   ┌──────┴──────┐                                       │
│   │ Bottom Eye  │ ← Pin bearing, fatigue               │
│   │  (M10-M14)  │                                       │
│   └─────────────┘                                       │
│        │                                                │
│        ▼                                                │
│   Suspension Arm                                        │
│                                                         │
└─────────────────────────────────────────────────────────┘

Stress Calculations:

Component Stress Type Formula Limit
Rod Axial σ = F/A < 0.6 × Sy
Rod Buckling Pcr = π²EI/L² SF > 3
Tube Hoop σh = P×r/t < 0.5 × Sy
Thread Shear τ = F/(π×d×Le) < 0.4 × Sy
Eye Bearing σb = F/(d×t) < Sy

Fatigue Considerations:

Application Typical Cycles Design Life
Road car 10⁷-10⁸ 200,000 km
Motorsport 10⁵-10⁶ Season/rebuild
Off-road 10⁶-10⁷ 100,000 km

3. Materials Engineering

High-Grade Aluminium Alloys:

Alloy Temper Sy (MPa) Application Notes
6061 T6 276 Tubes, bodies Good machinability, anodizes well
6082 T6 310 Structural Higher strength than 6061
7075 T6 503 High-load components Caution: stress corrosion
2024 T351 324 Fatigue-critical Good fatigue life

High-Grade Steels:

Steel Condition Sy (MPa) Application Notes
4140 QT 655-860 Piston rods Chrome-plated, ground
4340 QT 860-1100 High-load rods Premium fatigue
17-4 PH H900 1170 Corrosion-critical Stainless, hard chrome alternative
Nitriding steel Nitrided Surface 60 HRC Wear surfaces Case hardened

Rod Surface Treatments:

Treatment Ra (μm) Hardness Wear Corrosion
Hard chrome 0.1-0.2 65-70 HRC Excellent Good
Nikasil 0.1-0.2 55-60 HRC Very good Very good
QPQ/Nitride 0.2-0.4 60-65 HRC Good Excellent
DLC <0.1 70+ HRC Excellent Excellent

4. Sealing Technology

O-Ring Design Parameters:

┌─────────────────────────────────────────────────────────┐
│              O-RING GROOVE DESIGN                       │
├─────────────────────────────────────────────────────────┤
│                                                         │
│   STATIC SEAL (Face)          DYNAMIC SEAL (Rod)       │
│   ┌─────────────────┐         ┌─────────────────┐      │
│   │     ████████    │         │  │    ███    │  │      │
│   │  ▲  ████████    │         │  │    ███    │  │      │
│   │  │  ████████    │         │  └────███────┘  │      │
│   │  │             │         │       ███ ←Rod   │      │
│   │  Groove        │         │       ▲          │      │
│   │  depth         │         │       │          │      │
│   └─────────────────┘         │  Radial squeeze │      │
│                               └─────────────────┘      │
│                                                         │
│   Static: 15-25% compression    Dynamic: 8-16%         │
│   Fill: 75-90%                  Fill: 70-85%           │
│                                                         │
└─────────────────────────────────────────────────────────┘

O-Ring Compression Guidelines:

Application Compression % Stretch % Fill %
Static face 15-25 0-5 75-90
Static radial 12-20 1-5 75-85
Dynamic (slow) 10-16 2-5 70-85
Dynamic (fast) 8-14 2-5 70-80
High pressure 12-20 1-3 80-90

Common O-Ring Materials:

Material Temp Range Fluid Compatibility Application
NBR (Nitrile) -30 to +100°C Mineral oils, petroleum Standard damper
FKM (Viton) -20 to +200°C Most fluids, heat High-temp, motorsport
HNBR -30 to +150°C Oils, improved heat Performance road
EPDM -50 to +150°C NOT petroleum based Synthetic fluids only
PTFE -200 to +260°C Universal Special applications

Slyde Ring / Piston Seal Design:

┌─────────────────────────────────────────────────────────┐
│              SLYDE RING CONFIGURATION                   │
├─────────────────────────────────────────────────────────┤
│                                                         │
│   SINGLE SLYDE RING           DUAL SLYDE + ENERGIZER   │
│   ┌─────────────────┐         ┌─────────────────┐      │
│   │  │ ██████████ │ │         │  │ ████ ○ ████ │ │      │
│   │  │ ██████████ │ │         │  │ ████ ○ ████ │ │      │
│   │  │ ←PTFE/Bronze│ │        │  │ PTFE  O-ring│ │      │
│   │  │            │ │         │  │      ↑      │ │      │
│   │  └────────────┘ │         │  │  Energizer  │ │      │
│   │     Tube wall   │         │  └─────────────┘ │      │
│   └─────────────────┘         └─────────────────┘      │
│                                                         │
│   Low friction                 Better sealing at       │
│   Self-lubricating             low pressure            │
│                                                         │
└─────────────────────────────────────────────────────────┘

Slyde Ring Materials:

Material Friction Wear Pressure Application
PTFE Very low Moderate Low-med Standard
PTFE + Bronze Low Good Medium General
PTFE + Carbon Low Very good Med-high High duty
PEEK Low Excellent High Motorsport

Application Requirements Capture

Customer Questionnaire

markdown
## Damper Application Requirements

### 1. Vehicle Information
- Vehicle type: [Road car / Race car / Off-road / Industrial]
- Make/Model:
- Year:
- Suspension type: [MacPherson / Double wishbone / Multi-link / Solid axle]
- Existing damper (if replacing): [Make/Model/P/N]

### 2. Weight & Load
- Sprung mass per corner (kg):
- Unsprung mass per corner (kg):
- Weight distribution F/R (%):
- Max payload (kg):

### 3. Geometry
- Wheel travel (mm): Bump: ___  Droop: ___
- Motion ratio:
- Damper length (mm): Extended: ___ Compressed: ___
- Stroke (mm):
- Mounting: Top: [Type] Bottom: [Type]

### 4. Performance Requirements
- Primary use: [Comfort / Sport / Race / Off-road]
- Max damper velocity (m/s):
- Operating temperature range (°C):
- Environment: [Road / Track / Desert / Mud/water]

### 5. Damping Targets (if known)
- Rebound @ 0.3 m/s (N):
- Compression @ 0.3 m/s (N):
- Force ratio (C/R):
- Low-speed character: [Linear / Digressive]
- High-speed character: [Linear / Progressive]

### 6. Durability
- Expected life (km or hours):
- Service interval:
- Rebuild capability required: [Yes / No]

### 7. Constraints
- Max diameter (mm):
- Max weight (g):
- Budget range:
- Certification requirements:

Damping Curve Design Process

┌─────────────────────────────────────────────────────────┐
│           DAMPING CURVE DESIGN PROCESS                  │
├─────────────────────────────────────────────────────────┤
│                                                         │
│  1. VEHICLE DYNAMICS INPUT                              │
│     ├── Sprung/unsprung mass                           │
│     ├── Spring rate                                    │
│     └── Target ride frequency                          │
│              │                                          │
│              ▼                                          │
│  2. CRITICAL DAMPING CALCULATION                        │
│     Cc = 2 × √(k × m)                                  │
│              │                                          │
│              ▼                                          │
│  3. DAMPING RATIO SELECTION                             │
│     ├── Comfort: ζ = 0.2-0.3                           │
│     ├── Sport: ζ = 0.3-0.5                             │
│     └── Race: ζ = 0.5-0.8                              │
│              │                                          │
│              ▼                                          │
│  4. FORCE TARGET CALCULATION                            │
│     C = ζ × Cc (damping coefficient)                   │
│     F @ 0.3 m/s = C × 0.3                              │
│              │                                          │
│              ▼                                          │
│  5. CURVE SHAPE DESIGN                                  │
│     ├── Digressive: Low-speed comfort                  │
│     ├── Linear: Predictable                            │
│     └── Progressive: High-speed control                │
│              │                                          │
│              ▼                                          │
│  6. VALVE SPECIFICATION                                 │
│     └── DSSV port window design                        │
│                                                         │
└─────────────────────────────────────────────────────────┘

Damping Ratio Guidelines

Application ζ Rebound ζ Compression Ratio C/R
Luxury road 0.20-0.30 0.15-0.25 0.6-0.8
Sport road 0.30-0.45 0.20-0.35 0.5-0.7
Track day 0.40-0.60 0.30-0.45 0.5-0.7
Race (aero) 0.60-0.80 0.40-0.60 0.5-0.7
Rally/off-road 0.35-0.50 0.25-0.40 0.6-0.8

DSSV Valve Selection

Valve Sizing Matrix:

Damper OD Valve OD Port Area Range Force Range @0.3m/s
36mm 20mm 8-20 mm² 200-600 N
46mm 25mm 15-35 mm² 400-1200 N
60mm 32mm 25-60 mm² 800-2500 N

Port Window Shapes:

Shape Curve Application Tuning Range
Rectangular Linear Baseline, predictable Moderate
Tapered Digressive Comfort, ride quality Wide
Progressive slots Progressive High-speed control Moderate
Variable Custom Application-specific Maximum

Integration with Other Skills

Skill Integration Point
DamperAssembly Manufacturing handoff, assembly specs
PlantCapability Machining feasibility check
QuoteEstimator Cost estimation for custom designs
CuttingParams Machining parameters for components
MaterialSelection Cross-reference for specifications
APQPPPAP Product development process

Examples

Example 1: New customer application

User: "Customer wants dampers for a lightweight track day car"
→ Run ApplicationCapture workflow
→ Gather vehicle data, geometry, performance targets
→ Calculate damping requirements
→ Specify DSSV valve configuration
→ Generate preliminary specification

Example 2: Seal design query

User: "What O-ring compression for a 20mm rod dynamic seal?"
→ Reference seal design tables
→ Recommend 10-14% compression for dynamic
→ Specify groove dimensions
→ Recommend NBR or FKM material
→ Note lubrication requirements

Example 3: Material selection

User: "Need a lightweight piston rod material"
→ Review load requirements
→ Consider 17-4 PH stainless (high strength-to-weight)
→ Or 4340 with DLC coating
→ Check fatigue requirements
→ Provide specification

Recommended Agent Skills

Expand your agent's capabilities with these related and highly-rated skills.

robdtaylor/personal-ai-infrastructure

Cncsetup

Generate standardized CNC setup sheets for MNMUK machine shop. Covers DMG MORI mills/lathes, CITIZEN Swiss, MITSUBISHI EDM, and Haas machines. USE WHEN user says 'setup sheet', 'create setup', 'job setup', 'machine setup', 'tooling list', 'fixture setup', or 'new job' for any CNC operation.

0 0
Explore
robdtaylor/personal-ai-infrastructure

Costengineering

Manufacturing cost accounting, analysis, and reduction for automotive operations. Covers overhead/burden rate calculation, variance analysis, make vs buy decisions, value engineering, and cycle time to cost conversion. USE WHEN user says 'cost analysis', 'overhead rate', 'burden rate', 'variance analysis', 'make vs buy', 'value engineering', 'cost reduction', 'should cost', 'labour rate', or needs manufacturing cost guidance.

0 0
Explore
robdtaylor/personal-ai-infrastructure

Eightd

Structured 8D problem solving for customer complaints and quality issues. D0-D8 phases with containment, root cause analysis, and escape point identification. USE WHEN user says '8D', 'eight disciplines', 'customer complaint', 'corrective action', 'root cause analysis', 'containment', 'escape point', or 'problem solving report'.

0 0
Explore
robdtaylor/personal-ai-infrastructure

Toolcrib

Tool inventory management for MNMUK machine shop. Tracks tooling, inserts, consumables with reorder points and usage. USE WHEN user asks 'tool inventory', 'what inserts', 'reorder', 'tool crib', 'do we have', 'tooling cost', or 'tool usage'.

0 0
Explore
robdtaylor/personal-ai-infrastructure

Damperassembly

Dept 71 damper assembly operations for DSSV (Dynamic Suspensions Spool Valve) dampers. Covers component receipt, sub-assembly, fluid fill, gas charging, functional testing, and troubleshooting. USE WHEN user says 'damper', 'Dept 71', 'DSSV', 'spool valve', 'damper assembly', 'damper test', 'dyno test', 'fluid fill', 'gas charge', or needs damper-specific guidance.

0 0
Explore
robdtaylor/personal-ai-infrastructure

Skillsmatrix

Operator training and competency tracking for MNMUK machine shop. Supports IATF 16949 competency requirements and workforce planning. USE WHEN user asks 'who can run', 'training matrix', 'competency', 'skills matrix', 'operator certification', 'who is trained on', or workforce planning questions.

0 0
Explore

Didn't find tool you were looking for?

Be as detailed as possible for better results