Resources Contact Us Home
Method and device for controlling the trajectory of a shield-type tunnelling machine

Image Number 6 for United States Patent #4904115.

Method of controlling the trajectory of a shield-type tunnelling machine equipped with displacement control hydraulic rams (3), characterized in that, these rams being divided into at least three groups of rams (6A, 6B, 6C), the theoretical instantaneous flowrates of fluid to be applied to each of these groups are continuously determined (40) from the curvature characteristics and the overall rate of advance set point trajectory and these groups (7-26-27-28) are supplied with instantaneous flowrates, the values of which correspond to the theoretical values.

  Recently Added Patents
Method for forming a semiconductor device using selective epitaxy of group III-nitride
Anti-infective derivatives, method for the production thereof, pharmaceutical compositions containing same and uses of said derivatives in treatment
Power converter with a variable reference voltage and inrush current limiting
Tie down strap hook
Resuming piecewise calibration of a real-time-clock unit after a measured offset that begins at the next calibration period
Image sensor and method for fabricating the same
Glass or glass-ceramic pane reflecting infrared radiation
  Randomly Featured Patents
Adapting an encoded video signal to encoding complexity
Bias current control for operational amplifier current/voltage converters
Spread spectrum method for transmitting an information signal as a radio signal at a high speed
Aromatic cyanate-siloxane
Bumper reinforcement structure
Static dissipative polyurethane foams
Stator core resin remover and method
Methods, systems, and devices for monitoring anisocoria and asymmetry of pupillary reaction to stimulus
System and method for distortion characterization in fingerprint and palm-print image sequences and using this distortion as a behavioral biometrics
Wall mounted luminaire