Hydraulic Suspension Unit Test Bench

About

The Hydraulic Suspension Unit (HSU) Test Bench is a cutting-edge, fully automated system designed to test and verify the strength, durability, and performance of hydro-pneumatic suspension units. It simulates real-world conditions by applying both dynamic and static forces, ensuring that suspension units maintain structural integrity and effective shock absorption under extreme loads and harsh environments. Equipped with a powerful actuator, servo-controlled valves, a high-pressure hydraulic system, and a real-time data acquisition system, the bench measures critical parameters such as load, pressure, and travel. This testing solution is essential for industries like defense, heavy machinery, and automotive, where high-performance suspension systems are vital for safety and reliability.
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Technical Details

  • Tank capacity 1000 litres
  • Max pressure 250 bar
  • Actuator motion is controlled by automatic servo valve at a constant speed of 15-20 mm/sec.
  • Max static Load: 16 ton
  • Stoke of actuator for static stage: 375 mm
  • Dynamic Load: 16 ton
  • Max Stroke Length: 0-300 mm
  • Frequency: continuously variable.
  • Filter of 6 micron and 3 micron.
  • Filler Breather: 90 LPM, 10 Micron
  • Level Indicator: Size: 10”(254mm)
  • AC Motor: 15 KW, 3-Phase, 50Hz, 440VAC
  • Anti Vibration Pad: 200Kg Load.
  • Pressure relief valve: 300 Bar
  • Pressure Gauge: 0-400 bar, Dial Size: 4”, Panel Mountable
  • Accumulator: 300 bar
  • Load cell: 20 Ton
  • Check valve: 1.5 bar
  • Used for testing hydro- pneumatic suspension units
  • To measure static and dynamic load

Key Features

  • High performance Servo-hydraulic actuator is used for static and dynamic mechanical testing
  • DAQ system to generate the graph.
  • Lab-View software.
  • Tank top filter of 6 micron to filter oil regularly.
  • In-built LVDT sensors for actuator displacement.

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Details

The Hydraulic Suspension Unit (HSU) Test Bench is a cutting-edge, fully automated system designed to test and verify the strength, durability, and performance of hydro-pneumatic suspension units. It simulates real-world conditions by applying both dynamic and static forces, ensuring that suspension units maintain structural integrity and effective shock absorption under extreme loads and harsh environments. Equipped with a powerful actuator, servo-controlled valves, a high-pressure hydraulic system, and a real-time data acquisition system, the bench measures critical parameters such as load, pressure, and travel. This testing solution is essential for industries like defense, heavy machinery, and automotive, where high-performance suspension systems are vital for safety and reliability.

In modern-day industries such as defense, heavy machinery, and automotive, hydro-pneumatic suspension systems play a vital role in ensuring vehicle stability, shock absorption, and smooth operation across harsh terrains. These units are designed to maintain safety, comfort, and efficiency under extreme conditions like heavy loads, rough roads, and high-impact scenarios (e.g., artillery recoil). The Hydraulic Suspension Unit (HSU) Test Bench is a state-of-the-art testing solution developed to verify the strength, durability, and performance of these suspension systems. By simulating real-world conditions, the test bench ensures that each suspension unit meets rigorous performance and safety requirements.

What is a Hydro-Pneumatic Suspension Unit?
Ans. hydro-pneumatic suspension unit combines two core elements:
1. Gas Spring - Compressed gas (typically nitrogen) that provides a cushioning effect to absorb shock and maintain vehicle balance.
2. Hydraulic Damper - A system that controls the suspension's motion by converting kinetic energy into heat, thus preventing rapid oscillation and instability.
These components work together to protect both vehicle structures and passengers from severe impacts, ensuring stability during high-stress operations.

Purpose of the Hydraulic Suspension Unit Test Bench

The HSU Test Bench is designed to:
1. Test Strength and Leak Resistance - Applying extreme static proof pressure (up to 1000 bar) to ensure the suspension unit maintains its structural integrity without leaking or deforming.
2. Evaluate Dynamic Load Behavior - Simulating forces up to 180 kN (equivalent to the weight of 18 tons) to confirm that the unit can handle rapid changes in load during motion.
3. Measure and Monitor Key Performance Parameters - Generating detailed performance data
through sensors that monitor load, pressure, and travel.

Key Features and Components

The Hydraulic Suspension Unit Test Bench consists of several integrated components that enable precise and reliable testing, including:

1. HSU Power Pack:
  - Oil Reservoir: A 1000-liter servo oil tank stores hydraulic fluid to transmit force across the system.
  - High-Pressure Pump: The Parker PV Plus axial piston pump generates up to 250 bar of pressure.
  - Shock Absorption: A bellows system combined with anti-vibration pads reduces sudden pressure changes.
  - Filtration and Cooling: Dual-stage oil filtration removes contaminants (up to 3 microns), while anair-cooled oil cooler regulates temperature.

2. HSU Test Bench:
  - Actuator and Load Cell: Capable of applying loads up to 50,000 lbs, with real-time data monitoring.
  - Servo Valve Control: Maintains precise actuator speed at 15-20 mm/sec for test cycles.
  - Data Acquisition System: Collects real-time performance data, generating key graphs like Load vs. Wheel Travel and Pressure vs. Wheel Travel.

3. Damper Unit Test Bench: Evaluates the damper's ability to control suspension oscillations.

4. Static Proof Pressure Test Bench: Tests structural integrity under extreme pressure (up to 1000 bar).

How the System Works: The Physics Behind It

The Hydraulic Suspension Unit Test Bench leverages hydraulic and pneumatic principles to simulate real-world forces:

1. Hydraulic Pressure Transmission: High-pressure hydraulic oil transmits force efficiently due to its low compressibility.
2. Gas Compression: The gas spring behaves according to the ideal gas law (PV = nRT), storing and releasing energy during suspension movement.
3. Energy Dissipation: The damper converts kinetic energy into heat via viscous damping, controlling suspension motion and preventing rapid oscillation.

Operational Workflow

The system automates the testing process to ensure accurate and efficient data collection:

1. The operator logs into the control interface and enters test parameters.
2. The system starts automatically once the main pump is activated.
3. Dynamic or static forces are applied, and sensors collect real-time data.
4. Performance graphs are generated and displayed for analysis.

Safety Features and Protocols

Safety is critical given the high pressures and forces involved:

1. Pressure Limiting: Maximum operating pressure is set to 110 bar during tests.
2. Temperature Monitoring: Testing is halted if oil temperature exceeds 50°C.
3. Automated Shutdown: The system shuts down in case of critical failures.
4. Operator Protection: Manual intervention is prohibited during automated tests.

Applications and Industry Benefits
This test bench is indispensable for industries where suspension performance is critical:
- Defense: Ensures military vehicles can handle rough terrain and high-impact operations.
- Heavy-Duty Machinery: Validates suspension components for construction and industrial vehicles.
- Automotive: Tests high-performance suspension systems for off-road and commercial vehicles.

By ensuring high performance and reliability, the test bench minimizes the risk of failure in real-world applications.

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