Design 120 ft (36.6 m) Trailer-Mounted Boom Sprayer + FEA + Vibration Analysis
Budget: ₹12,500 – ₹37,500 INR
Subject Design 120 ft (36.6 m) Trailer-Mounted Boom Sprayer + FEA + Vibration Analysis
Hello,
I’m looking to hire an experienced mechanical design engineer (agricultural/off-highway equipment) to design and engineer a trailer-mounted boom sprayer with a 2000-3000 L tank pulled by a 50 HP tractor, with a working boom width of 120 ft (≈36.6 m).
Key constraint (very important): Transport folded width
• Max folded transport width ≤ 8 ft in the direction perpendicular to the trailer (normal transport)
• Up to ≤ 10 ft is acceptable if the folded boom can be oriented parallel to the trailer
You must propose a folding architecture that meets these transport envelopes.
I also need engineering validation for field vibration/rough terrain operation and want your recommendation on whether FEA is required.
________________________________________
Scope of Work & Deliverables
Phase 0 — Requirements confirmation (Deliverable: 1–2 page spec)
• Confirm key inputs and assumptions (trailer layout, boom height range, nozzle spacing, operating speeds, terrain roughness assumptions)
• Define target performance criteria (tip deflection target, stability goals, safety factors)
• Recommend overall architecture (e.g., multi-section truss boom, number of sections)
Output: Final requirements/specification document + recommended concept path.
________________________________________
Phase 1 — Concept + Folding Architecture (Deliverable: concept pack)
Provide 2–3 feasible concepts that meet the transport width limits, including:
• Folding sequence and sectioning (e.g., 7–9 sections)
• Boom structural approach (truss vs box beam)
• Boom mounting + stabilization concept (pendulum/parallelogram suspension)
• Breakaway tip concept for protection
• Rough weight estimate and CG estimate
• Risk list and final recommendation
Output: Selected concept with a clear folding diagram and transport envelope drawing.
________________________________________
Phase 2 — Detailed Mechanical Design (Deliverables: CAD + manufacturing drawings)
• Full 3D CAD assembly (boom, hinges, cylinders, locks, tower/mounts, nozzle line routing)
• 2D fabrication drawings suitable for local welding shop:
o weldment drawings, plate thicknesses, pin/bushing details, fastener grades
o hinge alignment/tolerance notes
• BOM (materials/thickness/quantities)
• Hydraulic design for folding:
o cylinder sizing and strokes
o recommended valves (counterbalance/lock valves)
o hose routing to avoid pinching during folding
• Transport locks:
o positive mechanical latches + safety pins (no hydraulic-only holding)
Output: Build-ready drawing package + BOM + hydraulic layout.
________________________________________
Phase 3 — Engineering Analysis (Deliverable: CAE/engineering report)
Please include analysis suitable for a 120 ft boom operating over uneven farmland:
1. Static structural analysis (FEA )
o Worst-case loads in spray position (self-weight + plumbing + reasonable factors)
o Folding/unfolding hinge worst cases
o Transport locked shock load case
2. Modal analysis
o Natural frequencies and mode shapes for full boom and major sections
o Identify resonance risks
3. Dynamic / Vibration response
o At least one realistic method:
transient dynamic response with terrain/bump input at expected field speeds, OR
harmonic response across likely excitation band
o Outputs: predicted tip displacement/acceleration vs speed and guidance for damping/suspension tuning
4. Fatigue assessment (recommended)
o Identify weld/hinge hotspots and propose reinforcements
Output: A clear report with assumptions, plots (stress/deflection/frequency), and design recommendations.
________________________________________
Phase 4 — Prototype support (optional)
• Limited support hours for fabrication questions
• Field test checklist and iteration suggestions after first trial
________________________________________
Additional design checks (must consider)
• Trailer stability and hitch loads when boom is deployed (turning, mild slope, uneven terrain)
• Transport safety (locks, latch redundancy)
________________________________________
What I will provide
• Tractor details (model and basic specs)
• Any preferred nozzle spacing/height
• Local fabrication capabilities
• Typical field and road conditions
________________________________________
Skills/Software desired
• Mechanical design for agricultural/off-highway equipment
• Folding boom / long weldments experience
• CAD: SolidWorks / Inventor / Creo (or equivalent)
• CAE: ANSYS / Abaqus / Nastran / SolidWorks Simulation (or equivalent)
• Modal + dynamic/vibration experience; fatigue is a plus
________________________________________
Screening questions (please answer)
1. Share an example of a folding structure you designed (boom/crane/implement arm) and its approximate length.
2. Which CAD + analysis tools will you use for static, modal, and dynamic/vibration work?
3. How will you model terrain/tractor-induced vibration input?
4. Will you deliver complete 2D fabrication drawings for weldments?
5. Can you estimate tip deflection and provide damping/suspension recommendations?
Thank you, and I look forward to your proposal.
Regards,
Hello,
I’m looking to hire an experienced mechanical design engineer (agricultural/off-highway equipment) to design and engineer a trailer-mounted boom sprayer with a 2000-3000 L tank pulled by a 50 HP tractor, with a working boom width of 120 ft (≈36.6 m).
Key constraint (very important): Transport folded width
• Max folded transport width ≤ 8 ft in the direction perpendicular to the trailer (normal transport)
• Up to ≤ 10 ft is acceptable if the folded boom can be oriented parallel to the trailer
You must propose a folding architecture that meets these transport envelopes.
I also need engineering validation for field vibration/rough terrain operation and want your recommendation on whether FEA is required.
________________________________________
Scope of Work & Deliverables
Phase 0 — Requirements confirmation (Deliverable: 1–2 page spec)
• Confirm key inputs and assumptions (trailer layout, boom height range, nozzle spacing, operating speeds, terrain roughness assumptions)
• Define target performance criteria (tip deflection target, stability goals, safety factors)
• Recommend overall architecture (e.g., multi-section truss boom, number of sections)
Output: Final requirements/specification document + recommended concept path.
________________________________________
Phase 1 — Concept + Folding Architecture (Deliverable: concept pack)
Provide 2–3 feasible concepts that meet the transport width limits, including:
• Folding sequence and sectioning (e.g., 7–9 sections)
• Boom structural approach (truss vs box beam)
• Boom mounting + stabilization concept (pendulum/parallelogram suspension)
• Breakaway tip concept for protection
• Rough weight estimate and CG estimate
• Risk list and final recommendation
Output: Selected concept with a clear folding diagram and transport envelope drawing.
________________________________________
Phase 2 — Detailed Mechanical Design (Deliverables: CAD + manufacturing drawings)
• Full 3D CAD assembly (boom, hinges, cylinders, locks, tower/mounts, nozzle line routing)
• 2D fabrication drawings suitable for local welding shop:
o weldment drawings, plate thicknesses, pin/bushing details, fastener grades
o hinge alignment/tolerance notes
• BOM (materials/thickness/quantities)
• Hydraulic design for folding:
o cylinder sizing and strokes
o recommended valves (counterbalance/lock valves)
o hose routing to avoid pinching during folding
• Transport locks:
o positive mechanical latches + safety pins (no hydraulic-only holding)
Output: Build-ready drawing package + BOM + hydraulic layout.
________________________________________
Phase 3 — Engineering Analysis (Deliverable: CAE/engineering report)
Please include analysis suitable for a 120 ft boom operating over uneven farmland:
1. Static structural analysis (FEA )
o Worst-case loads in spray position (self-weight + plumbing + reasonable factors)
o Folding/unfolding hinge worst cases
o Transport locked shock load case
2. Modal analysis
o Natural frequencies and mode shapes for full boom and major sections
o Identify resonance risks
3. Dynamic / Vibration response
o At least one realistic method:
transient dynamic response with terrain/bump input at expected field speeds, OR
harmonic response across likely excitation band
o Outputs: predicted tip displacement/acceleration vs speed and guidance for damping/suspension tuning
4. Fatigue assessment (recommended)
o Identify weld/hinge hotspots and propose reinforcements
Output: A clear report with assumptions, plots (stress/deflection/frequency), and design recommendations.
________________________________________
Phase 4 — Prototype support (optional)
• Limited support hours for fabrication questions
• Field test checklist and iteration suggestions after first trial
________________________________________
Additional design checks (must consider)
• Trailer stability and hitch loads when boom is deployed (turning, mild slope, uneven terrain)
• Transport safety (locks, latch redundancy)
________________________________________
What I will provide
• Tractor details (model and basic specs)
• Any preferred nozzle spacing/height
• Local fabrication capabilities
• Typical field and road conditions
________________________________________
Skills/Software desired
• Mechanical design for agricultural/off-highway equipment
• Folding boom / long weldments experience
• CAD: SolidWorks / Inventor / Creo (or equivalent)
• CAE: ANSYS / Abaqus / Nastran / SolidWorks Simulation (or equivalent)
• Modal + dynamic/vibration experience; fatigue is a plus
________________________________________
Screening questions (please answer)
1. Share an example of a folding structure you designed (boom/crane/implement arm) and its approximate length.
2. Which CAD + analysis tools will you use for static, modal, and dynamic/vibration work?
3. How will you model terrain/tractor-induced vibration input?
4. Will you deliver complete 2D fabrication drawings for weldments?
5. Can you estimate tip deflection and provide damping/suspension recommendations?
Thank you, and I look forward to your proposal.
Regards,