Chassis Base Data
Review of chassis kerb mass, wheelbase, axle ratings, design GVW and manufacturer-provided mass information.
TLG SYSTEMS • VEHICLE ENGINEERING
Vehicle Weight & Axle Load Calculation
Engineering-based mass distribution and axle-load analysis for bus, minibus, midibus and special vehicle projects.
TLG SYSTEMS evaluates chassis data, body structure, passenger capacity, installed equipment and component positions to calculate vehicle mass distribution and expected axle loads. The analysis supports layout development, system packaging, chassis selection and pre-homologation risk review.
01
ENGINEERING SCOPE
Weight must be controlled from the beginning of the project
Axle-load problems discovered after prototype production can require expensive changes to seating, equipment position, body structure or passenger capacity. Early calculation allows these risks to be identified during the layout stage.
Body Structure Mass
Estimation or evaluation of floor, side frames, roof, panels, glazing, doors and structural components.
Installed Equipment
Positioning and mass definition for HVAC, tanks, batteries, generators, lifts and project-specific equipment.
Passenger Capacity
Evaluation of seats, standing passengers, wheelchair areas, driver, crew and applicable passenger mass assumptions.
Luggage & Payload
Inclusion of luggage, service equipment and other payload conditions according to the intended vehicle use.
Axle Reaction Calculation
Calculation of front and rear axle reactions according to component masses and longitudinal positions.
02
CALCULATION METHOD
Mass, position and wheelbase define the axle reactions
Every major component is assigned a mass and a longitudinal centre-of-gravity position. Static equilibrium calculations are then used to determine the resulting axle loads.
REAR AXLE REACTION
Rrear = Σ(m × x) / L
FRONT AXLE REACTION
Rfront = Mtotal − Rrear
m
Individual component or payload mass
x
Distance from the selected reference axle
L
Vehicle wheelbase
Mtotal
Total vehicle mass for the selected load condition
03
LOAD CONDITIONS
Different operating conditions must be checked
The final analysis can include multiple vehicle configurations to identify the most critical axle-loading scenario.
04
RISK REVIEW
Typical weight and axle-load risks
The analysis identifies where the selected layout may exceed chassis capacity or leave insufficient engineering margin.
Front Axle Overload
Excessive front equipment, entrance structure or passenger
concentration ahead of the wheelbase.
Rear Axle Overload
Rear-mounted HVAC, generator, batteries, luggage or high
passenger concentration.
GVW Exceedance
Total calculated mass exceeding the permitted gross vehicle
weight.
Insufficient Payload
Excessive body and equipment mass reducing available
passenger or luggage capacity.
Unbalanced Layout
Component placement creating unnecessary axle imbalance or
limiting future project derivatives.
Low Engineering Margin
Calculated axle load remaining too close to the technical
limit after tolerance and production variation.
05
WORKFLOW
From component data to axle-load report
Calculation accuracy depends on the quality and maturity of the available chassis, body and component information.
01
Data Collection
Chassis masses, axle ratings, wheelbase, vehicle layout and available component data are collected.
02
Mass Breakdown
Body, interior, systems, passengers, luggage and optional equipment are organized into calculation groups.
03
Position Definition
Each mass is assigned a longitudinal centre-of-gravity position relative to the vehicle axles.
04
Load-Case Calculation
Front axle, rear axle and total vehicle mass are calculated for the selected operating conditions.
05
Limit & Margin Review
Results are compared with available chassis ratings and project targets.
06
Layout Recommendations
Component positions, passenger layout or equipment scope can be revised where necessary.
TYPICAL OUTPUTS
Clear mass breakdown and axle-load results
Deliverables are structured according to available project data, required calculation detail and vehicle configuration.
- Vehicle mass breakdown table
- Component mass and position list
- Front and rear axle-load calculation
- Kerb and fully laden scenarios
- Passenger and luggage load cases
- GVW and axle-limit comparison
- Available payload calculation
- Axle-load margin evaluation
- Critical component position review
- Layout improvement recommendations
Calculation basis and final verification
Preliminary results depend on the accuracy of the supplied chassis, component and vehicle data. Final vehicle mass and axle loads must be verified using physical weighing of the completed vehicle and evaluated according to the applicable approval requirements.
START A CALCULATION
Need to verify vehicle weight and axle-load distribution?
Send the available chassis data, seating layout, component list, estimated masses and installation positions for an initial engineering review.
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