measurement of imbalance vibrations

Description:

• In rotating machines such as turbines or pumps, vibrations due to imbalance lead to comfort problems or even damage related to overloading.
• The imbalance of a rotating machine part may cause harmful vibrations in the entire machine. A familiar example is unbalanced tyres on a car.
• These cause annoying and unpleasant vibrations in the steering.
• This is why almost all rotating parts are balanced.
• If this balancing is done not on a particular machine but directly on the machine in operation located on-site, it is known as field balancing.
• Field balancing is done in four steps. In the first step, the vibrations are used to measure the initial imbalance.
• In the second step, additional known test imbalances are applied and the system is measured again.
• In the third step, the balancing is calculated from these two measurements and is applied.
• The fourth step is a control run to check whether the balancing has been successful.
• The core of the PT 502unit comprises two flywheels that are driven by an electric motor.
• Defined imbalances can be attached to the flywheels.
• At the foot of the motor are two acceleration sensors that measure the imbalance vibrations.
• The speed is measured by an optical sensor.
• The motor is mounted on the base plate with vibration-damping rubber elements.
• The unit is driven at variable speed by a frequency converter.
• The measured values are transmitted directly to a PC via USB, where they can be analysed using the vibration analysis software that comes included.
• This analysis software has the following features: dual-channel oscilloscope for investigations in the time range, dual-channel spectrum analyser for investigations in the frequency range, vibration amplifier and balancing module for single and two-plane balancing.

Technical Details:

Specification:

• field balancing in one or two planes
• 2 flywheels with mounting holes for imbalance or balance masses and angular division
• imbalance or balance masses in different sizes
• drive motor with variable speed via a frequency converter
• elastic bearing of the drive motor
• vibration isolation of the base plate using rubber feet
• control unit with integrated measuring amplifier
• instrumentation: optical speed sensor, 2 acceleration sensors for vibration measurement
• software functions: dual-channel oscilloscope, dual-channel FFT analyser, ramp-up curve, order analysis and balancing
• GUNT software for data acquisition via USB under Windows 8.1, 10

Technical Data:

• Flywheels:
  • 2x mass: 1,675kg
  • radius for balance masses: 60mm
  • angular division: 15°
• Drive motor:
  • speed: 300…3000min^-1
  • power: 370W
• Imbalance or balance masses:
  • 2…10g
  • total imbalance: 2x 42cmg
• Acceleration sensors
  • frequency range: 1…10000Hz
  • sensitivity: 100mV/g
  • resonant frequency: 32kHz
• Optical speed sensor
  • scan range: 3…150mm
  • laser class II: 675nm
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 510x450x380mm (experimental unit)
• L x W x H: 370x360x160mm (control unit)
• Weight: approx. 39kg (total)

Required for Operation:

• PC with Windows

Learning Objectives/Experiments:

• measure and assess machine vibrations
• occurrence of imbalance vibrations
• static, dynamic or general imbalance
• dependence of imbalance vibration on position and magnitude of the imbalance
• basic principles of balancing
• field balancing in one plane
• field balancing in two planes
• assessment of balancing quality
• using a computerised vibration analyser

Scope of Delivery:

• 1 experimental unit
• 1 control unit
• 1 set of accessories
• 1 GUNTsoftware + USB cable
• 1 set of instructional material

Features:

• single and two-plane balancing

Accessories:

• Optional:
• WP 300.09 Laboratory trolley

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.