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
Measuring apparatus for measuring a physical property of a sample
Mirror drift compensation in an optical circuit switch
Optical multiplexer/demultiplexer
Pharmaceutical compositions of paclitaxel, paclitaxel analogs or paclitaxel conjugates and related methods of preparation and use
Digital-to-analog converter and performing method thereof
Method of isolating human neuroepithelial precursor cells from human fetal tissue
Display device and projector
  Randomly Featured Patents
Echo canceler
Magnet array and support bracket
Classifying or sorting
Hybrid integrated optical circuit and device for emitting light waves
Agent for promoting filtration dehydration of metal hydroxide slurry
Sample feeding device for trace detector and trace detector with sample feeding device
Process for the preparation of 5-amino-1,3-dioxanes
Dynamic memory array with segmented bit lines
Massively parallel detection
Apparatus for calibrating the alignment of a wafer cassette holder to a robot blade