Auto Tuned Vibration Absorber for Reciprocating Saw: Vibration dynamics modelling, simulation and analysis
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Författare
Typ
Examensarbete för masterexamen
Modellbyggare
Tidskriftstitel
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Volymtitel
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Sammanfattning
This thesis work investigates an Auto Tuned Vibration Absorber(ATVA) developed
by RISE IVF AB for a reciprocating saw (SR 30-A36). ATVA is a tuned vibration
absorber whose stiffness exhibits non-linear behaviour. The project aim was to develop
an ATVA prototype for reciprocating saw wherein the system parameters of
ATVA are tuned for optimal vibration suppression. The entire work was emphasized
on measurement of excitation force, optimization of system parameters, prototype
development of ATVA.
Prototype development was based on measurements of the excitation force experienced
by reciprocating saw while freely running, cutting chipboard and metal-pipe.
Actual measurement data was used as input to the simulations and optimization.
Further, optimizations were carried out in MATLAB and ADAMS software was used
to verify the response obtained.
Non-linear stiffness in ATVA is constructed using two linear springs with a gap between
them. Earlier, ATVA with a linear spring and gap was used in a prototype
and the system had problems getting activated when connected to reciprocating
saw. In this thesis work, the main idea to solve the problem of activation was by
using an additional spring in the prototype which can activate ATVA as soon as
the system gets excited. Optimizations were performed to identify the two spring
stiffness required, the gap between them and the auxiliary mass value for optimal
vibration attenuation. Finally the activation of ATVA was verified by simulating
the operating conditions.
Beskrivning
Ämne/nyckelord
Auto Tuned Vibration Absorber (ATVA), Reciprocating saw, non-linear stiffness, linear spring