Abstract:
A system for isolating the mounting pads of a vibrating beam or tuning fork force transducers from longitudinal vibrations generated by transverse vibrations of the beam or tuning fork tines which extend between the mounting pads. The system includes an arrangement of longitudinally resilient support links and masses that flex responsive to change in the length of the beam or tines as the beam or tines vibrate transversely. The support links and masses thus isolate the mounting pads from the longitudinally vibrations of the beam or tuning fork tines while allowing transmission of forces applied between the mounting pads which vary the force dependent resonant frequency of the beam or tuning fork.
Abstract:
A mass and force meter locked over its measuring system and comprising a frame, a load support, and a force transmission channel with a load-dependent force transmission ratio and at least one swivel lever is provided, in which the combination of the non-linearity of the measuring system with that of other elements of the meter can be eliminated with a force transmission channel having a non-linear characteristic, such a channel having a smaller resilience than the known meters coupled with a better adaptability to meeting the requirements for the parameters determining the non-linearity to be eliminated and with easy adjustment of these parameters, the swivel lever being connected with at least one adjacent element of the force transmission channel by means of a link having one of its ends fitted to the swivel lever, the link being mounted at least partly outside the action line of the force transmitted and being at least zone-wise elastically bendable.
Abstract:
A vibrating wire measuring instrument, such as a vibrating wire galvanometer, dynamometer, or strain gauge, wherein the wire which is to execute transverse vibrations is mounted between two fixing members, and node masses are rigidly attached to the wire so that the latter is subdivided into (a) two connection portions (between the node masses and the fixing members) and (b) an intermediate portion (between the node masses); the wire is of constant cross section and integrally formed; the node mass may be soldered or welded to the wire or clamped, e.g. in a detachable manner.
Abstract:
A mass and force meter having a frame, a load support and a digital computing device, a first and a second electrically excited, transversely vibrating string, first transmission elements transmitting the mass or force to be measured to said strings, second transmission elements transmitting a pre-loading force to said strings, so that the resultant frequency variations caused by the application of said mass or force are used in the computing and display device for computation of the magnitude of said mass or force, said first transmission elements having a first and a second branch, a first guide fixed to the frame, said first string having one end fastened to said frame and the other end connected to one end of said second string, to said first guide and to said first branch of said first transmission elements, a second guide fixed to the frame, the other end of said second string being connected to said second guide, to said second transmission elements and to said second branch of said first transmission elements.
Abstract:
A force sensing device in which the oscillations of a vibrator are damped by applying a weight, force, which is to be measured directly against a vibrating element. The output of a transducer, which converts the vibrator's motions into an electric signal, is fed into a readout instrument, recorder, or computer for observation and evaluation.
Abstract:
A vibrating wire gage for use with a mine rockbolt. The wire is anchored within the hollow portion of a cylindrical gage body that has an adjustable lower member. Rotation of the adjustable member changes the tension in the wire and as a result its frequency of vibration. Forces acting on the bolt imbedded in the rock cause the gage body to deform as well as its wire since the upper end of the gage body is held to a rockbolt anchored firmly within the earth. By noting variations in the frequency of the wire from an initial setting, the change in the amount of force the rockbolt is under can be determined. A rotatable pick can be inserted through a hole in the lower adjustable member to mechanically pluck the wire. The readout of the vibrations from the plucked wire may be accomplished by a mechanics stethoscope held against the gage or by an electrically operated pickup head which engages the vibrating wire.
Abstract:
The invention relates to an apparatus for linearly converting a mechanical quantity into a frequency, which apparatus comprises a body which is capable of vibrating and is set into vibration at its resonant frequency by a vibration generator, a device for changing the resonant frequency by changing the bending stiffness of the body, and a device for indicating the frequency, the said body being a leaf spring and the quantity to be measured causing bending of this leaf spring in a transverse direction.
Abstract:
A flat vibrating measuring string or ribbon suitable for use with a vibrating string weighing apparatus. The cross-section of the string is selected with such a large ratio of the largest to the smallest cross-sectional axis that the resonant frequencies of the desired mth vibrating mode in the direction of the minimum bending rigidity are situated below the resonant frequencies of the first mode in the transverse direction. The string is also enlarged at its ends, preferably by means of interconnecting rounded portions, to minimize the peak stress where the string is clamped. To further minimize the tension at the ends of the string where they are clamped, the string is secured to a junction mass having a resistance and modulus of elasticity which is within an order to magnitude of that of the string.