arrow_back_ios

Main Menu

See All Acoustic End-of-Line Test Systems See All DAQ and instruments See All Electroacoustics See All Software See All Transducers See All Vibration Testing Equipment See All Academy See All Resource Center See All Applications See All Industries See All Insights See All Services See All Support See All Our Business See All Our History See All Our Sustainability Commitment See All Global Presence
arrow_back_ios

Main Menu

See All Actuators See All Combustion Engines See All Durability See All eDrive See All Transmission & Gearboxes See All Turbo Charger See All DAQ Systems See All High Precision and Calibration Systems See All Industrial electronics See All Power Analyser See All S&V Hand-held devices See All S&V Signal conditioner See All Accessories See All DAQ Software See All Drivers & API See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All Test Data Management See All Utility See All Vibration Control See All Acoustic See All Current / voltage See All Displacement See All Load Cells See All Pressure See All Strain Gauges See All Torque See All Vibration See All LDS Shaker Systems See All Power Amplifiers See All Vibration Controllers See All Accessories for Vibration Testing Equipment See All Training Courses See All Articles See All Whitepapers See All Acoustics See All Asset & Process Monitoring See All Custom Sensors See All Data Acquisition & Analysis See All Durability & Fatigue See All Electric Power Testing See All NVH See All Reliability See All Smart Sensors See All Vibration See All Weighing See All Automotive & Ground Transportation See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Release Notes See All Compliance See All Our People
arrow_back_ios

Main Menu

See All CANHEAD See All GenHS See All LAN-XI See All MGCplus See All Optical Interrogators See All QuantumX See All SomatXR See All Fusion-LN See All Accessories See All Hand-held Software See All Accessories See All BK Connect / Pulse See All API See All Microphone Sets See All Microphone Cartridges See All Acoustic Calibrators See All Special Microphones See All Microphone Pre-amplifiers See All Sound Sources See All Accessories for acoustic transducers See All Experimental testing See All Transducer Manufacturing (OEM) See All Accessories See All Non-rotating (calibration) See All Rotating See All CCLD (IEPE) accelerometers See All Charge Accelerometers See All Impulse hammers / impedance heads See All Cables See All Accessories See All Electroacoustics See All Noise Source Identification See All Environmental Noise See All Sound Power and Sound Pressure See All Noise Certification See All Industrial Process Control See All Structural Health Monitoring See All Electrical Devices Testing See All Electrical Systems Testing See All Grid Testing See All High-Voltage Testing See All Vibration Testing with Electrodynamic Shakers See All Structural Dynamics See All Machine Analysis and Diagnostics See All Process Weighing See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All On-Site Calibration See All Resources See All Software License Management

Random-on-random

A vibration controller feature used within a closed-loop test system to drive shakers by generating a profile that combines broadband random excitation with multiple narrow-band signals.

img

Random-on-random

expand_more
chevron_left
chevron_right

Random-on-random (RoR) control simulates real-world complex vibration environments with a combination of a broadband random signal and one or more superimposed random narrow-bands. Both signal types are usually present simultaneously and the narrow-bands can appear at fixed frequencies or sweep over a predefined range. The overall random PSD (power spectral density) shifts with time or is related to a variable-speed device.

In RoR, a more complex function of the basic random control profile, all resonant frequencies of any given payload are excited at once; thus, it is well suited for product qualification and fatigue tests. A typical example is the repetitive stress on a truck’s headlights, as the vehicle changes speed while travelling on rough terrain.

USE SCENARIOS

  • Simulation of vibration characterized by a broadband random profile with one or more superimposed random narrow-band signals
  • Truck vibration testing during variations in speed
  • Testing of caterpillar-tracked vehicles that have two or more drive trains for changing speed and direction, such as bulldozers, tanks and excavators
  • Testing of machines with reciprocating or rotating components, such as propeller-driven aircraft

CHARACTERISTICS

In this type of test profile, the broadband signal also consists of a user-specified breakpoint table of PSD versus frequency. Typically, up to 12 narrow-band signals can be concurrently generated, where each band has independently set PSD amplitude, frequency-sweep range and rate. Narrow-bands can be configured both at user-specified fixed frequencies or in sweeping mode.

Slopes and crossover points are automatically calculated by the control algorithm. There is usually a choice to sum the narrow-band and broadband or to use the largest PSD value from the profile. This allows the swept narrow-band to either dominate on a broadband slope or to be reduced where the broadband is higher.

There usually is a harmonic mode, whereby subsequent narrow-bands are configured using integer multiples of the first narrow-band’s frequency parameters.

RoR control contains all of the automatic and manual test controls that are available in the random profile feature. A PSD amplitude versus frequency sweep envelope for narrow-bands is typically included, providing a pre-test validation of the configuration. During tests, individual narrow-bands and the broadband can usually be turned on and off manually, or automatically according to a pre-defined timetable.

File

Description

Type

Languages

Size

Vibration Control Software for VC-LAN Vibration Controller Types 7541 and 7542

Technical Document English 867 KB