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Climatic Four-Poster Shaker

The four-poster shaker encompasses a traditional four-poster design situated in a fully climatic chamber. It tests products with four single-axis vertical actuators that move in an up-and-down motion. It can be programmed to simulate any condition such as a gravel road, high-velocity potholes or jarring drop simulations. In addition, the room has climatic capabilities, with temperatures ranging from -40˚C to +60˚C and five per cent to 95 per cent relative humidity.


Although the four-poster was designed primarily for automotive use, it can be utilized for a wide range of industries due to its climatic capabilities. Sectors include:

  • agricultural vehicles
  • automotive
  • construction vehicles
  • defense
  • human performance
  • motorcycles
  • motorsport
  • scooters
  • unmanned aerial vehicles (UAVs)

A white Toyota RAV4 is on the Four-Poster Shaker.

Testing examples

Suspension (durability and life cycle) can be tested under different surface simulations, such as gravel roads or pot holes. Suspension optimization is available for motorsports to optimize ride comfort, while structural and squeak-and-rattle tests ensure product quality.  

A close-up image of the Four-Poster Shaker.

Key features 

  • Drive-on post feature with automatic positioning system.
  • Temperatures ranging from -40°C to +60°C and relative humidity ranging from five per cent to 95 per cent.
  • Dual modes: Road-load simulation and high-flow, high-G.
  • Complete suite of ancillary systems for customer vehicle operation.

An ACE employee is in the control room. There is a yellow car on the Four-Poster Shaker.

Test section features 

Overall dimensions:

  • Length: 8.3 metres
  • Width: 7.2 metres
  • Height: 5.6 metres

Vehicle entry clearance

  • Width: 4.26 metres
  • Height: 4.49 metres

Drive-on wheel pans

Remotely adjustable track and wheelbase

Exhaust extraction system



Man-down pull cord

In-chamber power

Outlets for plug-in vehicles

A white Toyota RAV4 is on the Four-Poster Shaker.

Thermal performance specifications 

Thermal Performance Specifications

Other performance (measured):

  • Maximum cooling rate: +60°C to -40°C in six hours.
  • Temperature uniformity: σ ≤ 1.05 °C over the entire temperature range -40°C to +60°C.
  • Temperature stability: σ = 0.28°C over the entire temperature range -40°C to +60°C.

A white Toyota RAV4 is on the Four-Poster Shaker.

Four-poster shaker specifications 

Manufacturer and model

MTS 248.05

Control system

Flextest GT with 793 system software

Simulation software

MTS RPC Pro software

Actuator force


Servovalve flow


Vehicle types

Passenger car, light-duty trucks

Track range

1,270 mm to 2,110 mm

Wheelbase range

1,572 mm to 4,572 mm

Vehicle weight

4500 kg

Range of motion

+/- 150 mm

Frequency response

0.5Hz to 50Hz

Maximum acceleration

19.5 g to 100 g (depending on moving mass)

Maximum velocity

5 m/s