Measuring and testing – Vibration – Sensing apparatus
Patent
1980-02-28
1982-08-10
Gill, James J.
Measuring and testing
Vibration
Sensing apparatus
73493, G01H 104
Patent
active
043431860
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a remotely controllable vibration pickup according to the preamble of claim 1, which is suitable particularly for use in inaccessible places. Thus, to demonstrate the operating safety of nuclear reactors, vibration measurements, among other things, must be performed at a number of points, for instance, at the coolant feed- and discharge pipes, which, while they must be made before the startup and therefore without radiation exposure, then nevertheless with the installation completely assembled. The measuring points which are chosen for the measurements and are prepared for instance, by making suitable contact surfaces for the measuring devices available, are often accessible only by means of so-called instrumentation lances, in the head of which the measuring devices are arranged and which are brought through suitable canals, gaps or the like. The application of the invention, however, is not limited to this use, which is described here as an example.
The result of the vibration measurement on a part is naturally falsified by the fact that the vibration properties of the part are influenced by the measuring device resting against it itself. This detrimental influence can be made negligibly small by keeping the mass of the measuring device small as compared to that of the part; this, however, presents difficulties if the mass of the manipulator, i.e., the instrumentation lance, must be included in the former.
It is an object of the present invention to describe a remotely controllable device for vibration measurement which can be positioned securely and the co-vibrating mass of which is kept as small as possible. Thereby, the spring force required to provide the contact pressure for the measuring device at high frequencies is kept very small.
This problem is solved by the means proposed in the feature part of claim 1. "Non-rigid connections" or yieldable connections are understood here to mean primarily cables for the power supply to the measuring devices and the conveyance of the measurement data obtained to indicating devices, memories etc., which, in order to keep the co-vibrating mass of the measuring device small, are arranged separate from the latter. This mass is reduced to an absolute minimum by the provision that the manipulator device is decoupled vibration-wise from the measuring device proper for the duration of the measurement.
An embodiment of this idea of the invention is proposed in the second claim. Securing the measuring devices at the measuring point by means of spring force is the most advantageous solution with respect to assembling and disassembling them as well as with respect to the means required for the auxiliary devices to be provided at the part. If the pickup device is braced with one measuring device each against different parts, the latter can be measured in one operation.
The means proposed in the third claim serve to make the assembly and disassembly of the measuring devices at the point of measurement realizable for remote control.
It is particularly useful to combine two or more measuring devices in one device and have them braced against opposite portions of the same part if, as is proposed in the 4th claim, the individual measuring devices are arranged for picking up vibrations in different directions, for instance, with three devices in the X-, Y- and Z-direction.
An embodiment example of the invention is shown in the drawing, where
FIG. 1 shows the lower portion and
FIG. 2, the upper portion of an axial longitudinal section, and
FIG. 3, a cross section according to the line I-II.
In some part 1, the vibration behavior of which is to be investigated but which is not shown in detail, a cylindrical canal 2, for instance, is arranged, into which an appropriate measuring device or instrument can be inserted, as shown here. This device consists of two measuring instruments 3, each consisting of a clamping member 31 and the accelerometer proper 32, which is arranged in the former. The accelerometer is connected via a cable 4 to an indicating d
REFERENCES:
patent: 3225294 (1965-12-01), McClung et al.
patent: 3859847 (1975-01-01), Ronemus
Gill James J.
Greenberg Laurence A.
Interatom Internationale Atomreaktorbau GmbH
Lerner Herbert L.
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