title: Comparison of system identification techniques in the analysis of a phantom for studying shaken-baby syndrome.
abstract: This article compares two techniques for estimating the parameters describing the motion of a phantom designed to investigate shaking baby syndrome. Parameters of a simple computational model and an impulse response function for a linear second order system were both fitted using kinematic measurements of the motion of an inverted jointed pendulum. From the two methods respectively, the rotational stiffness of the joint was calculated to be 1.396 kgm(2) s(-2) and 1.355 kgm(2) s(-2) and the damping coefficient was calculated to be 0.0142 kgm(2) s(-1) and 0.0133 kgm(2) s(-1). The parameter estimates were similar demonstrating that the two techniques were comparable. Identifying accurate parameters will allow more complex phantoms to be modeled, and will provide insight into the relationship between the shaking of the torso and the resultant head motion during shaken baby syndrome.
authors.affiliation: Auckland Bioengineering Institute, The University of Auckland. tlin067@aucklanduni.ac.nz
authors.forename: Thomas O
authors.initials: TO
authors.lastname: Lintern
authors.forename: Mark C
authors.initials: MC
authors.lastname: Finch
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Taberner
authors.forename: Poul M F
authors.initials: PM
authors.lastname: Nielsen
authors.forename: Martyn P
authors.initials: MP
authors.lastname: Nash
mesh_terms: D000465:Algorithms; D040761:Biomimetic Materials; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006257:Head / Q000503:physiopathology*; D019416:Head Movements; D006801:Humans; D007231:Infant, Newborn; D008954:Models, Biological; D009333:Neck / Q000503:physiopathology*; D010812:Physical Stimulation / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D038642:Shaken Baby Syndrome / Q000175:diagnosis* / Q000503:physiopathology*