From the high-speed dynamics of a scooter to the extreme thermal loads of a locomotive, ETA's BDM Series covers the full spectrum of inertia brake testing on a single unified platform architecture. Intelligent simulation. Certifiable data. Standards-ready from day one — SAE, ISO, UIC, JIS.
Every braking event in the real world converts kinetic energy into heat. A brake dynamometer recreates this on a test bench by spinning a precisely sized flywheel assembly to a target speed — where the rotational kinetic energy represents the energy that the brake under test must absorb in the simulated vehicle stop.
ETA's BDM Series combines a mechanical flywheel set with an electric drive motor fitted with Inertia Simulation (I-Sim) capability. The flywheel gives the large baseline inertia; I-Sim trims it continuously during the stop — allowing any inertia value within the machine's range to be reproduced with precision, not just discrete stepped values. This hybrid approach delivers both high energy capacity and fine simulation accuracy.
When the brake is applied, the system decelerates under the braking torque — precisely as a vehicle would. Speed, torque, temperature, pressure, noise and deceleration are all logged at high sample rates throughout every stop. The result is a controlled, repeatable, certifiable test — impossible to achieve with consistency on a vehicle test track.
ETA's unique position is the full-spectrum range: the same platform architecture — the same control philosophy, the same software environment, the same modular variant system — scales from a 75 kW drive for e-bike discs right up to 500+ kW for locomotive bogie brake assemblies. One supplier. One relationship. The right machine for wherever your product sits on the spectrum.
Flywheel set is engaged (automatically or manually) to set the base mechanical inertia. I-Sim motor provides continuous fine trim to match the exact vehicle axle inertia — no rounding to nearest flywheel increment.
The drive motor accelerates the flywheel-spindle-brake assembly to the programmed test speed (equivalent to vehicle road speed). All cooling air flow is synchronised to the rotation to replicate in-vehicle conditions.
At the trigger point, the drive motor is disconnected. The programmed brake apply pressure ramp is executed. I-Sim compensates for mechanical inertia deviation in real time throughout the stop.
Speed, torque, pressure, temperature, deceleration, NVH — all captured at up to 1 kHz. Every stop cycle is timestamped. Raw and calculated parameters are stored per cycle for the automated report.
The system resets automatically — brake releases, temperatures cool to specified inter-stop conditions, drive re-engages, spins up again. Entire test protocols run unattended overnight with no operator intervention.
On completion, ISO-compatible automated test reports are generated with all performance curves, summary tables and statistical analysis — ready for regulatory submission or internal release.
Every BDM machine shares the same platform DNA — unified control software, common modular variant options, the same data format. Choose the series that fits your application today; add modular upgrades as your programme grows.
Every BDM Series model — M, V, T or R — can be configured at order (or upgraded in the field) with one of three variant levels. Start with Standard, expand to Environmental or NVH Pro when your programme demands it.
The foundation of any brake testing programme. Full mechanical inertia and I-Sim, standard durability controls, automated test execution and smart reporting. Everything you need to run approved test protocols and generate certifiable performance data.
Adds full environmental control — the complete climatic and contamination simulation capability needed for all-weather certification, wet-braking validation, corrosion testing and cold-climate approvals. Includes all S features.
The full noise, vibration and harshness capability for brake squeal research, pad/caliper development and quiet-braking validation. Acoustic isolation to below 45 dBA background. Includes all S features. Upgradeable from S or E in the field.
Engineered for precision. Scalable from micro-mobility to heavy-haul transit. All models share the ETA platform architecture and unified software environment.
| Technical Parameter | M-Series · M-02 Micro-Mobility |
V-Series · V-12 Passenger & LCV |
T-Series · T-35 Commercial / Heavy |
R-Series · R-100 Rail & Locomotive |
|---|---|---|---|---|
| Primary Application | Motorcycle / Scooter / E-Bike | Passenger Vehicles, LCV, EV | Truck / Bus / Off-Highway | High-Speed Rail / Metro / Freight |
| Braking Torque Capacity | ~2,000 Nm (Dynamic) | 5,650 Nm (Dynamic) | 35,000 Nm (FMVSS Rated) | >100,000 Nm (System Total) |
| Rotational Speed Range | 0 – 3,000 RPM | 0 – 2,000 RPM | 0 – 1,500 RPM | Wheel-size dependent |
| Simulated Inertia Range | 5 – 100 kg·m² | 5 – 275 kg·m² | 100 – 2,500 kg·m² | >7,000 kg·m² per wheel |
| Prime Mover Power | ~75 kW AC | 220 kW AC (High-Dynamic Drive) | ~350 kW AC | >500 kW |
| Inertia Regulation | Base flywheel + electric trim (I-Sim) | Hybrid 8-stage flywheel + I-Sim | High-mass mechanical flywheel | Modular flywheel banks |
| Control Dynamics | High-response controls | ≥350 bar/s ramp rate | SAE J211-compliant controls | UIC 541 / AAR profiles |
| Torque Sensing Technology | Inline shaft torque sensor | Reaction type sensor (high stiffness) | Reaction torque sensor | Strain gauge / reaction |
| Environmental Modules (E-Variant) | Convective air cooling | Wet, corrosion & acoustic testing | Dust, slurry & thermal testing | Snow / sand / ice simulation |
| Brake Types Tested | Disc & drum — 2-Wheeler | Disc & drum — car / LCV / EV caliper | Disc & drum — air / hydraulic brake | Tread block & disc — rail |
The ETA BDM control and software platform turns raw test data into decisions — fast. Every machine in the family runs on the same ETA UI, so switching series means zero software retraining.
Fully programmable unattended operation via ETA UI. Load the standard, enter the sample ID, walk away. The system executes the entire protocol — including inter-stop cooling holds, pressure ramp profiles and sequence branching — without operator intervention.
Torque, speed, pressure, temperature and deceleration logged at up to 1 kHz sample rate per channel. All raw data is stored per stop cycle with full timestamp. Nothing is averaged away before you see it — the full waveform is yours.
ISO-compatible automated test reports generated on completion. Performance curves, statistical summaries, pass/fail against standard limits — all formatted for direct submission to certification bodies, OEM quality systems or internal release notes.
Compatible with third-party systems and protocols. EtherCAT-based signal conditioning minimises electrical noise. Open data formats allow integration with vehicle simulation, FEA post-processing and customer MES / LIMS systems.
24/7 diagnostics via ETA's Remote Support System (ERS) — the same system proven across ETA's friction welding machine fleet. Issue-to-resolution time is minimised because our engineers can see your machine's live data without a site visit.
Modular design means every Standard (S) machine can be upgraded to Environmental (E) or NVH Pro (N) in the field — without machine replacement. Add regenerative braking simulation, ABS hardware-in-the-loop or advanced acoustic analysis as your programme evolves.
Combining a mechanical flywheel with a real-time electric inertia simulation motor allows any inertia value to be set — not just discrete flywheel increments. This is critical for reproducing the varied axle inertia values across a vehicle range without multiple flywheel change-overs.
EV and hybrid vehicle programmes require blended braking simulation — where friction braking and regenerative energy recovery work together. ETA's BDM V-Series supports regenerative torque injection during the stop, allowing NVH and performance of the blended system to be characterised on the bench.
The E-Variant climatic chamber conditions the brake assembly at any temperature within range before and during testing — enabling cold-morning stop performance, hot-soak fade, and full winter simulation. Temperature uniformity across the brake assembly is actively controlled and logged throughout.
The NVH Pro enclosure is designed as an acoustic free-field chamber — background noise below 45 dBA. The test chamber and drive unit are mounted on separate, isolated frames to eliminate structure-borne vibration contamination from the measurement. High-fidelity microphones and optional laser vibrometer characterise every squeal, squeak and groan event.
The ETA UI is identical across M, V, T and R Series machines. Test protocols, report templates, operator training, remote diagnostics — all transferable between machines. Labs with multiple dynamometers from different series operate from one familiar interface, reducing operational complexity and training overhead.
The BDM ships with pre-configured test protocols for all major standards relevant to its series — SAE J2522, J2784, J2521 (NVH), ISO 26866, FMVSS 135, UIC 541 (Rail). No protocol building required: select the standard, enter sample details, run. Reduces time-to-first-test from weeks to days after commissioning.
ETA's BDM platform is designed to be standards-ready from the first day of operation. All relevant protocols are pre-configured at delivery — no custom programming required.
Brake pad, lining and disc manufacturers needing to develop, validate and obtain type approval for their products across vehicle categories. The full BDM range allows a single supplier to run everything from 2-wheeler pads to locomotive composite brake blocks on one platform family.
Vehicle manufacturers and brake system Tier 1s needing in-house dynamometer capability for programme development, NVH resolution, regenerative braking integration (EV programmes) and global homologation. Multiple series for different vehicle lines.
Third-party labs, automotive research institutes (NATRiP, NATRAX, ICAT) and university research groups offering certification testing services. The BDM's standards-ready platform means a lab can be operational for multiple client programmes from day one.
Electric vehicle manufacturers — two-wheeler, three-wheeler, car and bus — needing to validate blended friction-regenerative braking systems. The V-Series' regenerative braking simulation capability is specifically designed for this growing segment.
Brake block and disc pad manufacturers supplying Indian Railways, metro operators and export markets. The R-Series is configured for UIC, AAR and RDSO standards — the machines needed for type approval of braking components for rolling stock.
India's large two-wheeler and electric two-wheeler industry — OEMs and their brake component suppliers — needing AIS-037 compliance testing and NVH development for the domestic and export market. The M-Series is purpose-built for this segment at the right scale.
Tell us your vehicle category, the brake types you test, the standards you need to comply with, and your throughput target. ETA will recommend the right series, variant and configuration — with a full technical proposal.