3D Bracket Door Analysis
Budget: $100 – $150 USD
Project Title: URGENT: Mechanical Design, Hand Calculations Data & FEA Validation for Helicopter Hinge Joint
Project Overview:I am looking for an experienced Mechanical Engineer to perform comprehensive analytical calculations, 3D CAD modeling, and Finite Element Analysis (FEA) for a newly designed helicopter side door hinge connection. The joint is subjected to a severe 4G vertical pull-up maneuver, and its structural integrity must be validated against strict safety standards.
Provided Calculation Framework (To be completed by you):To ensure consistency with my reporting standards, I have already defined the baseline assumptions and calculation methodology. You are expected to extract the geometric data from the CAD/drawings and complete the math using this framework:
Total Force: Door mass is 15 kg. Under 4G acceleration, the total downward force is 588.6 N. Assuming equal distribution between two brackets, the applied downward force per bracket is F = 294.3 N.
Primary Shear ($F'$): 294.3 N / 3 bolts = 98.1 N per bolt (-y direction).
Secondary Shear (F''): You must extract the exact centroid coordinates (x-bar, y-bar) and radial distances (r_i) from your CAD model to calculate the moment (M) and complete the secondary shear equations.
Failure Theory: For the required Factor of Safety (FoS >= 2.5) of the selected bolt, you must use the Distortion Energy (von Mises) theory where S_sy = 0.577 * S_y.
Scope of Work:
1. Complete the Analytical Hand Calculations:
Kinematics & Load Analysis: Calculate the centroid, find the maximum resultant shear force (V_max) on the most critical fastener based on the framework provided above.
Component Selection: Select an appropriate metric fastener (e.g., M8, M10) and ISO property class, proving it meets the 2.5 FoS.
Bearing Assessment: Assuming the 14 kN preloaded slip-critical joint overcomes friction, calculate the maximum bearing stress on the 5mm thick Aluminum 7075 bracket and check for yielding.
PTFE Bearing Design: Design the hinge bearings (PTFE) for an operating frequency of 1 Hz (90-degree rotation) with a required FoS of 3.
2. 3D Modeling & FEA Validation (ANSYS or similar):Model Creation: Create a 3D solid model of the bracket and bolt-hole interfaces.Analysis Setup: Set up a Static Structural analysis by applying the 294.3 N load and corresponding moment (eccentric load) representing the 4G maneuver.Visualization: Visualize maximum shear stresses, equivalent stresses, and identify stress concentration regions around the critical holes.
3. Final Deliverables (Data & Assets for Reporting):(Note: I do not need a fully formatted academic report. I only need the detailed data and assets so I can write the report myself.)
Calculation Data & Steps: A document (Word/PDF) showing all completed math steps, centroid coordinates, final stress values, and safety factors.
FEA Visuals & Comparison Data: High-quality screenshots of the FEA mesh, stress contours, and a clear comparison table between the analytical hand results and FEA results (including percentage error).
Source Files: 3D CAD models (STEP/IGES), FEA simulation archive files.
Deadline:Strictly before June 25, 2026. Timely delivery is an absolute priority.
Project Overview:I am looking for an experienced Mechanical Engineer to perform comprehensive analytical calculations, 3D CAD modeling, and Finite Element Analysis (FEA) for a newly designed helicopter side door hinge connection. The joint is subjected to a severe 4G vertical pull-up maneuver, and its structural integrity must be validated against strict safety standards.
Provided Calculation Framework (To be completed by you):To ensure consistency with my reporting standards, I have already defined the baseline assumptions and calculation methodology. You are expected to extract the geometric data from the CAD/drawings and complete the math using this framework:
Total Force: Door mass is 15 kg. Under 4G acceleration, the total downward force is 588.6 N. Assuming equal distribution between two brackets, the applied downward force per bracket is F = 294.3 N.
Primary Shear ($F'$): 294.3 N / 3 bolts = 98.1 N per bolt (-y direction).
Secondary Shear (F''): You must extract the exact centroid coordinates (x-bar, y-bar) and radial distances (r_i) from your CAD model to calculate the moment (M) and complete the secondary shear equations.
Failure Theory: For the required Factor of Safety (FoS >= 2.5) of the selected bolt, you must use the Distortion Energy (von Mises) theory where S_sy = 0.577 * S_y.
Scope of Work:
1. Complete the Analytical Hand Calculations:
Kinematics & Load Analysis: Calculate the centroid, find the maximum resultant shear force (V_max) on the most critical fastener based on the framework provided above.
Component Selection: Select an appropriate metric fastener (e.g., M8, M10) and ISO property class, proving it meets the 2.5 FoS.
Bearing Assessment: Assuming the 14 kN preloaded slip-critical joint overcomes friction, calculate the maximum bearing stress on the 5mm thick Aluminum 7075 bracket and check for yielding.
PTFE Bearing Design: Design the hinge bearings (PTFE) for an operating frequency of 1 Hz (90-degree rotation) with a required FoS of 3.
2. 3D Modeling & FEA Validation (ANSYS or similar):Model Creation: Create a 3D solid model of the bracket and bolt-hole interfaces.Analysis Setup: Set up a Static Structural analysis by applying the 294.3 N load and corresponding moment (eccentric load) representing the 4G maneuver.Visualization: Visualize maximum shear stresses, equivalent stresses, and identify stress concentration regions around the critical holes.
3. Final Deliverables (Data & Assets for Reporting):(Note: I do not need a fully formatted academic report. I only need the detailed data and assets so I can write the report myself.)
Calculation Data & Steps: A document (Word/PDF) showing all completed math steps, centroid coordinates, final stress values, and safety factors.
FEA Visuals & Comparison Data: High-quality screenshots of the FEA mesh, stress contours, and a clear comparison table between the analytical hand results and FEA results (including percentage error).
Source Files: 3D CAD models (STEP/IGES), FEA simulation archive files.
Deadline:Strictly before June 25, 2026. Timely delivery is an absolute priority.