Abstract: Vibration absorbers comprising torsional viscous damper of the tube-type are tuned using one or more elastic members to improve the ability of the vibration absorbers to reduce problematic torsional vibrations. The torsional stiffness of the vibration absorbers is designed to meet a requirement between the frequency to be removed and the polar moment of inertia of the tube-type damper.

Abstract: A device is disclosed for measuring torsional vibrations superimposed on rotating equipment such as a shaft. The device may be fastened to a rotating shaft by a collar and includes a sensor array comprising two or more accelerometers measuring the radial acceleration of the sensor array and the tangential acceleration of the sensor array. The gravitational component of the accelerometer signals is identified either by isolation in one of the signals, or by comparing two or more signals. From the tangential and radial acceleration signals, a torsional vibration amplitude is calculated from the ratio of the tangential acceleration and the radial acceleration. The radial acceleration is further used to determine the average velocity of the sensor array. The tangential acceleration may further be integrated to obtain the angular velocity of the sensor array, or further integrated to obtain the angle rotated through.

Abstract: A device is disclosed for measuring torsional vibrations superimposed on rotating equipment such as a shaft. The device may be fastened to a rotating shaft by a collar and includes a sensor array comprising two or more accelerometers measuring the radial acceleration of the sensor array and the tangential acceleration of the sensor array. The gravitational component of the accelerometer signals is identified either by isolation in one of the signals, or by comparing two or more signals. From the tangential and radial acceleration signals, a torsional vibration amplitude is calculated from the ratio of the tangential acceleration and the radial acceleration. The radial acceleration is further used to determine the average velocity of the sensor array. The tangential acceleration may further be integrated to obtain the angular velocity of the sensor array, or further integrated to obtain the angle rotated through.

Abstract: A drive for a rotary printing press has a clutch with improved reliability in the main drive gear train. The drive has a gearwheel mechanism for transmitting a rotational movement of transfer drums during delivery of a printing material. The gearwheel mechanism includes a gearwheel pair with a driving gearwheel and a driven gearwheel and the driven gearwheel, which is arranged coaxially with respect to the driving gearwheel, is coupled during delivery to a shaft journal of a transfer drum. A clutch is provided for selectively producing and interrupting the transmission of torque between the driving gearwheel and the driven gearwheel. At least one motor is provided for feeding a torque into the gearwheel mechanism. A stepup gear mechanism is arranged in the torque flow between a clutch half of the clutch and a gearwheel.

Abstract: Imageable printing forms are irradiated by radiant energy corresponding to the image information, the energy being absorbed in the printing form. The energy coupled in in this manner is available for patterning the printing form surface. A printing form having a plurality of substantially planar functional zones, which have at least one informational zone that is modifiable in accordance with image information and an absorption zone for absorbing energy from a radiation is distinguished in that a buffer zone is provided which differs at least partially from the absorption zone, receives energy from the absorption zone, and releases energy to the informational zone.

Abstract: A method and apparatus are described for removing a chemical product species produced by electrochemical action at an electrode or by a chemical reaction which occurs at the surface of a solid catalyst. The method involves providing a flow of a host solution generally parallel to a surface at which a chemical reaction occurs. The flow of the host solution causes the products from the chemical reaction to be entrained in a thin boundary layer which moves along the surface. These products can be removed from a cell by withdrawing the boundary layer from the cell as it reaches the trailing edge of the surface.

Abstract: A method and apparatus are described for removing a chemical product species produced by electrochemical action at an electrode or by a chemical reaction which occurs at the surface of a solid catalyst. The method involves providing a flow of a host solution generally parallel to a surface at which a chemical reaction occurs. The flow of the host solution causes the products from the chemical reaction to be entrained in a thin boundary layer which moves along the surface. These products can be removed from a cell by withdrawing the boundary layer from the cell as it reaches the trailing edge of the surface. The products may additionally be removed at intermediate points along the surface to prevent the host solution from becoming depleted. Various apparatus for practising this method are also described. The apparatus and method are capable of removing a desired product species in a more highly concentrated form than is possible with commonly available current techniques and apparatus.