At our stand at ambient temperatures up to + 55 ° C, it is possible to carry out load tests of a wide variety of vehicles - from a jeep - an SUV to an eight-axle armored personnel carrier, from a crawler tractor to a modern tank.
Purpose

The purpose of the stand is to conduct stationary tests of power plants of caterpillar and wheeled vehicles with engine power up to 3200 hp. By definition of the following main indicators:

  • Power, traction and speed characteristics on the output shafts of machines when the engine is running at full or partial load
  • Efficiency of the cooling system when adjusting the temperature of the heated air at the stand in the range from ambient to + 55 ° C
  • Smoke and exhaust gas toxicity
  • Heat dissipation inside the power section and external surfaces
  • The costs of fuel and lubricants and air consumed by the power plant at various engine operating conditions

At the stand, it is possible to conduct long-term tests of power plants in modes that simulate movement along the medium-crossed terrain at ambient temperatures up to + 55 ° C of the following machines:

  • Tanks
  • Caterpillar and wheel armored personnel carriers
  • Tractors
  • Trucks with one or two rear axles
  • SUV SUVs
  • Tractors
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Load devices

Loading devices are the main elements of the stand.

The composition of the left or right loader includes:

  • An inductive brake WS 1200 from CARL SCHENCK with a power of 1600 hp, in which the torque supplied to its rotor is retarded by the magnetic field that heats the stator; The heat transfer from its core is carried out by water
  • Inertial drum simulating the mass of the tested machine, the required moment of inertia of which is provided by an appropriate set of 12 disks
  • Friction, which serves to protect the mechanisms of the tested machine from breakages by rapid disconnection of the rotating masses of the inertial drum and the brake rotor
  • Connecting shafts and couplings; Multipliers with gear ratios i1 = 6 and i2 = 3.14, used to match the real values ​​of torque and angular velocities on the left or right output shaft with the performance of the WS 1200 brake shaft
  • Total reduction gear with gear ratio i3 = 2, serving to transfer torque from the hubs of one or two driving axles of wheeled vehicles to the brake shaft WS 1200

Loading devices can be assembled according to 5 schemes, differing from each other by the number of gear ratios depending on the setting of the adapter shaft, one or two multipliers, or a totalizing reducer. When choosing a scheme, the type of testing carried out, as well as the speed, traction, mass and overall parameters of the machine are taken into account.

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Specifications

Technical characteristics of bench loading devices when assembling them according to 5 schemes.

Permissible maximum speeds and weights of the tested machines for different assembly schemes of the stand loading devices

# schema For machines with a driving wheel radius of 0.4 m Gear ratio of loading device
Maximum speed, km / h Range of simulating the mass of the machine, t
I 30 180…700 18.84
II 100 18…71 6
III 150 7.5…22 3.14
IV 600 0.6…2 1
V 180 2.2…8.1 2
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Information-measuring equipment

The information and measuring equipment of the stand consists of two personal computers, a rack-matching unit for 96 measuring channels, two printers and a demonstration screen. This complex allows for real-time tests with a frequency of 1 to 100 Hz to receive and process up to 0.5% of the signals coming from the sensors installed on the machine. With the help of special software, the information is displayed graphically on the monitors, as well as printing the test report on the printer and saving it to a file on the hard disk of the computer.

The list of measured parameters:

  • Engine speed, output shafts of the machine, supercharger impellers and fans
  • Moments on the shafts of brakes WS 1200
  • Power on the output shafts of the machine, taking into account the efficiency of the loading devices of the stand
  • Temperature and pressure of liquids in the circuits of lubrication systems of the engine and transmission, water cooling system, hydraulic equipment and fuel system
  • Temperature, pressure and rarefaction of air and gases in air and exhaust systems
  • Mass fuel consumption
  • Displacement of fuel pump rails, levers and control rods
  • Voltage and amperage in electrical circuits
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