1. Overview of Romax Software

1.1 Development Background

1.2 Core Functions

Gearbox Modeling and Parametric Design

• It supports a wide range of gear types, including spur gears, helical gears, planetary gears, and bevel gears.
• It provides comprehensive databases covering materials, bearings, and lubrication parameters.

Multi-Physics Simulation

• Structural Mechanics: Capable of analyzing stress, deformation, and fatigue life.
• Dynamics: Conducts vibration analysis and Noise, Vibration, and Harshness (NVH) analysis.
• Thermal Analysis: Focuses on the optimization of lubrication and heat dissipation.

System-Level Simulation

2. Key Technologies of Romax in Gearbox Simulation

2.1 Gear Contact Analysis and Strength Check

• Hertzian Contact Stress Calculation: Simulates the distribution of contact pressure on tooth surfaces to predict the risk of pitting corrosion.
• Tooth Root Bending Stress Analysis: Evaluates the anti-fracture capacity of gears in accordance with standards such as ISO 6336 or AGMA.
• Micro-Geometric Optimization: Reduces edge contact stress through modifications, such as tooth profile modification and helix angle correction.

2.2 Dynamics and NVH Analysis

• Modal Analysis: Identifies the natural frequencies of the gearbox to avoid resonance.
• Transfer Path Analysis (TPA): Locates vibration and noise sources, such as gear meshing excitation and bearing vibration.
• Acoustic Simulation: Predicts the noise radiation of the gearbox, which requires coupling with acoustic software like LMS Virtual.Lab.

2.3 Bearing and Shafting Simulation

• Bearing Life Prediction: Calculates the L10 life of bearings based on the ISO 281 standard.
• Shaft Deformation Analysis: Considers the impact of bending and torsion on gear meshing.

2.4 Thermal Analysis and Lubrication Optimization

• Oil Film Thickness Calculation: Assesses the state of Elastohydrodynamic Lubrication (EHL).
• Thermal Network Model: Predicts the influence of gearbox temperature rise on lubricating viscosity and fatigue life.

3. Romax Gearbox Simulation Process

3.1 Modeling Steps

Geometry Import

Material and Boundary Condition Definition

• Set parameters for gear materials (e.g., 20CrMnTi), hardness, and surface treatment.
• Define input rotational speed, torque, and load spectrum.

Mesh Generation

3.2 Simulation and Analysis

• Static Analysis: Computes gear contact stress and bearing loads.
• Dynamic Analysis: Performs transient simulations to evaluate impact loads during start-up and braking conditions.
• Fatigue Analysis: Predicts the service life of gears and bearings based on Miner's rule.

3.3 Optimization Design

• Parametric Optimization: Automatically adjusts parameters such as module and tooth width to meet the requirements for strength and NVH performance.
• Sensitivity Analysis: Identifies key design variables, such as the impact of helix angle on noise.

4. Comparison of Romax with Other Software

5. Conclusion