FINE TUNE & Operating Deflective Shape Analysis
ODS, for short, is a VISUAL technique, marrying AMPLITUDE and PHASE data so as to show the observer HOW the machine and/or its structure are moving whilst in operation.
This typically involves the construction of a machine and structure SKETCH that we will animate according to the collected data.
Field observation is made difficult because machines operate at speeds that do not enable the engineer to capture the relationships involved in the various movements.
ODS grants the possibility of SLOWING DOWN the movement and the capacity to observe the RELATIVE movement of one component versus another.
In understanding the relation between these machine and structure components’ movements, we may identify particular problems and arrive at a PROPER modification or solutions of the components.
ODS also EXAGERATES the displacement or amplitude of the movement : very small movements are difficult to perceive, whereas an exagerated movement is readily visible when slowed down to a proper pace !
ODS REDUCES the machine to a simple SKETCH which can easily be observed, as opposed to dealing with the physical dimensions of the machine and running back and forth to and from various reference points while the machine is in operation.
FINE TUNE enables the end user to quickly build ODS templates to animate them once the proper data has been collected in the field.
As any ODS study supposes STEADY STATE, process variations should be altogether eliminated. These would introduce (a) variable(s) which may be part of the vibration problem. Some experience is thus required on the part of the user to determine when process (temperature, load, water column, speed, etc) may or may not be a contributing factor to the perceived problem.
For machines that are called upon to work in wildly varying conditions, maintaining the process variables during a short time to finish the collection of a given data set (defined according to the process variations) will enable the user to compare different ODS !
As a change in process means a change in various loads applied to the machine, an extensive study MAY reveal the nature of an heretofore unseen problem !
Goal of Fine-tune