Design and Simulation of PID Controller based Pressurized Head Box in Paper Machine

The head box in a paper machine is a critical component. Head box control is required for quality paper formation. Stock level and Total pressure in the paper machine head box determines the quality of the paper. This paper determines the design of PID controller for the pressure type head box. The stock level and pressure are the parameters taken into consideration.

Structure and Design Research for 200L Extrusion Hollow Blow Molding Machine Head

On the basis of traditional hollow blow molding machine head, this paper researches the accumulating corner style machine head. This kind of machine head employs double layers and double spiral flow channels which solve the intensity problem of the large scale blow molding machine with single spiral flow channel on the fusion seam area. His paper researched the technological parameter and structure size based on the structural style.

Inward Leakage in Tight-Fitting PAPRs

A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.

Dynamic Hybrid Modeling of the Vertical Z Axis in a High-Speed Machining Center: Towards Virtual Machining

This paper describes the modeling and simulation of the Z axis of a five axis machining center for high-speed milling. The axis consists of a mechanical structure: machine head and electro-mandrel, a CNC system interfaced with the feed drive, and a pneumatic system to compensate for the weight of the vertical machine head. These subsystems were studied and modeled by means of: (1) finite element method modeling of the mechanical structure; (2) a concentrated parameter model of the kinematics of the axis; (3) a set of algebraic and logical relations to represent the loop CNC-Z feed drive; (4) an equation set to represent the functioning of the pneumatic system; and (5) a specific analytical model of the friction phenomena occurring between sliding and rotating mechanical components. These modeled subsystems were integrated to represent the dynamic behavior of the entire Z axis. The model was translated in a computer simulation package and the validation of the model was made possible by comparing the outputs of simulation runs with the records of experimental tests on the machining center. The firm which promoted and financed the research now has a virtual tool to design improved machine-tool versions with respect to present models, designed by traditional tools.

Dynamic Hybrid Modeling of the Vertical Z Axis in an HSM Machining Center: Towards Virtual Machining

The paper describes the dynamical real-time simulation of the Z axis of a five axis machining center for high speed milling. The axis consists of a mechanical structure: machine head and electro-mandrel, a CNC Control System provided with feed drives and a Pneumatic System to compensate the weight of the entire vertical machine head. These three sub-systems have been studied and modeled by means of: • FEM modeling of the mechanical structure; • an equation set to represent the main functions of the CNC; • an equation set to represent the functioning of the Pneumatic System. These different modeling sub-systems have been integrated to obtain the entire actual dynamical behavior of the Z axis. A particular analysis was developed to represent the friction phenomena by a specific analytical model. Experimental activity was developed to test and validate the different modeling sub-systems, and other experimental tests were performed on the machining center to compare simulation outputs with experimental responses.

Machine Head: Raoul Hausmann and the Optophone

Dadaist Raoul Hausmann, famous for his photomontages, is perhaps less well known as a pioneer of synaesthetic machines designed to transform sound into form and vice versa—not unlike primitive computers, in fact. The author has located the patent for one such invention, artist Peter Keene's realization of which accompanies this historical account