Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-08-02
2005-08-02
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S602000, C324S535000
Reexamination Certificate
active
06923065
ABSTRACT:
An apparatus and method for inspecting and calculating the residual strength of an aramid fiber rope driving an elevator to determine when such rope is in need of replacement. The apparatus comprises a transmitter for introducing an acoustic wave that will travel along the aramid fiber rope and a plurality of receivers for receiving the acoustic wave after its has traversed a designated section of the rope. The transmitter and receiver provide signals indicating the times the wave was sent by the transmitter and thereafter received by the receiver. From these signals, a program calculates the wave velocity, and the modulus and residual strength of the aramid rope.
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M. Ferreira, T.M. Lam, V. Koncar, Y. Delvael, “Non-destructive testing of Polyaramide Cables by Longitudinal Wave Propagation: Study of the Dynamic Modulus”, Polymer Science Engineering, vol. 40, No. 7, pp. 1628-1634.
Nickerson James
Palazzola Michael A.
Parrish Randall
Smith Rory
Sweet Robert H.
Frost Brown Todd LLC
Saint-Surin Jacques M.
Thyssen Elevator Capital Corp.
Williams Hezron
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