An MDA Proposal To Integrate the Measurement Lifecycle Into the Process Lifecycle

Context: Measuring the Software Development Process (SDP) supports organizations in their endeavor to understand, manage, and improve their development processes and projects. In the last decades, the SDP has evolved to meet the market needs and keep abreast of modern technologies and infrastructures. These changes in the development processes have increased the importance of the measurement and caused changes in the measurement process and the used measures. Objective: This work aims to develop a solution to support the measurement activities throughout the process lifecycle. Method: Study the current state of the art to identify existing gaps. Then, propose a solution to support the process measurement throughout the SDP lifecycle. Results: The proposed solution consists of two main components: (i) Measurement lifecycle, which defines the measurement activities throughout the SDP lifecycle, (ii) Measurement definition metamodel (MDMM), which supports the measurement lifecycle and its integration into the process lifecycle. Conclusion: This proposal allows organizations to define, manage, and improve their processes; the proposed information model supports the unification of the measurement concepts and vocabulary. The defined measurement lifecycle provides a comprehensive guide for the organizations to establish the measurement objectives and carry out the necessary activities to achieve them. The proposed MDMM supports and guides the engineers in the complete and operational definition of the measurement concepts.

Optical In-Process Measurement: Concepts for Precise, Fast and Robust Optical Metrology for Complex Measurement Situations

Optical metrology is a key element for many areas of modern production. Preferably, measurements should take place within the production line (in-process) and keep pace with production speed, even if the parts have a complex geometry or are difficult to access. The challenge for modern optical in-process measurements is, therefore, how to simultaneously make optical metrology precise, fast, robust and capable of handling geometrical complexity. The potential of individual techniques to achieve these demands can be visualized by the tetrahedron of optical metrology. Depending on the application, techniques based on interferometry or geometrical optics may have to be preferred. The paper emphasizes complexity and robustness as prime areas of improvement. Concerning interferometric techniques, we report on fast acquisition as used in holography, tailoring of coherence properties and use of Multiple simultaneous Viewing direction holography (MultiView), self reference used in Computational Shear Interferometry (CoSI) and the simultaneous use of several light sources in Multiple Aperture Shear Interferometry (MArS) based on CoSI as these techniques have proven to be particularly effective. The use of advanced approaches based on CoSI requires a transition of the description of light from the use of the well-known wave field to the coherence function of light. Techniques based on geometric optics are generally comparatively robust against environmental disturbances, and Fringe Projection (FP) is shown to be especially useful in very demanding measurement conditions.

Development of a Rheology Die and Flow Characterization of Gas-Containing Polymer Melts

We present a novel measurement die for characterizing the flow behavior of gas-containing polymer melts. The die is mounted directly on the injection-molding cylinder in place of the mold cavity and thus enables near-process measurement of viscosity (i.e., under the conditions that would be present were a mold attached). This integration also resolves the issue of keeping gas-containing polymer melts under pressure during measurement to prevent desorption. After thermal characterization of the die, various correction approaches were compared against each other to identify the most suitable one for our case. We conducted measurements using polypropylene in combination with two different chemical blowing agents. Increasing the blowing-agent content to up to 6% revealed an interestingly low influence of gases on melt viscosity, which was confirmed by elongational viscosity measurements. For verification, we compared our results to corresponding measurements taken on a high-pressure capillary rheometer and found that they were in excellent agreement. Our die cannot only be used for rheological characterization. Combined with ultrasound sensors, it provides an innovative way of measuring the volumetric flow rate. This development represents an important step in improving the sustainability of gas-containing polymer processing.

DISTRIBUSI CAHAYA LAMPU DAN TINGKAH LAKU IKAN PADA PROSES PENANGKAPAN BAGAN PERAHU DI PERAIRAN MALUKU TENGAH

The objective of this study was to khow the distribution underwater light intensity and fish behavior in fishing process of boat bagan. The data were collected through observation to fishing process, measurement of under water light intensity using marine under water lux meter, fish behavior using fish finder based on hauling time before mid night (19:00-00:00) and after mid night (01:00-05:00. The data analyzed comprise catching process, distribution of under water light intensity,and fish behavior. The results of the study indicate that illumination of light detected under water is 21 m vertically and 12 m horizontally with the value of each illumination is 0.1 lux and 3.0 lux from the center of light. The choice of illumination zone by the fish before mid night is 8-1,5 lux at the depth range 15 - 20 m and after mid night at the illumination 8 - 1,5 lux at the depth range 10-15 m of illumination 8-1,8 lux. During fishing process, the fishes were concentrated at 8 – 1,8 lux more than others zone

IN-PROCESS MEASUREMENT AND NUMERICAL DETERMINATION OF THE TEMPERATURE IN THE CONTACT ZONE DURING SINGLE LIP DEEP HOLE DRILLING

In this presented work, the main objective is the in-process measurement of the thermal as-is state near the drilling contact zone by means of a sensor-integrated tool for single lip deep hole drilling (SLD). Additionally, the mechanical quantities feed force and drilling torque are evaluated. The process monitoring is essential to optimize the surface quality as well as the subsurface properties such as hardness and residual stresses. These quantities are strongly dependent on the thermo-mechanical as-is state in the cutting zone and in the contact zone between the guide pads and the drill hole surface. This contribution gives a project overview including the development of a sensor-integrated single lip deep hole driller for the in-process temperature measurement, the integration of sensor systems in the tool as well as the experimental investigations on the temperature, the feed force and the drilling torque during drilling of a 42CrMo4 steel. The temperature measurement at eleven positions in the driller head provides data to observe the heat generation, distribution, and flow independently from the workpiece characteristics. However, one of the greatest benefits is the non-destructive fashion of the measurement system with their sensor integrated in the tool and thus the reusability. A simulation method, which uses the experimental results as a reference, is used to predict the thermo-mechanical conditions in the contact zone of the drill head and the workpiece. The results of these thermo-mechanical process simulations and the validation of this applied FE approach using the measured quantities are presented, too. The results of this work are part of an interdisciplinary research project in the framework of the priority program "Surface Conditioning in Machining Processes" (SPP 2086) of the German Research Foundation (DFG).