The cracks alter the physical and modal properties of the beam, i.e., stiffness, damping, natural frequency, and mode shapes, and, in turn, the dynamic response of the beam changes to a considerable ...extent. The condition monitoring of the beams is essential to avoid its catastrophic failure in applications. A basic criterion has been followed for modal parameters like natural frequencies, mode shapes, and stiffness for the possible crack detection. In contrast, damping as a dynamic property to represent structural damage has been limited due to the difficulties in measuring damping and analysis. Therefore, in this study, the effect of various possible crack profiles, i.e., V-shaped and U-shaped, on the applicability of using the damping criterion for determining the presence of damage in the cantilever structure was investigated. The damping loss factor for all the cracked cases of a cantilever beam was computed using ANSYS and experimental analysis. The numerical results of the damping loss factor were compared with experimental results. It was understood that the results were susceptible to the crack geometries changes.
► We design a domain-specific modeling language called the Sequencer. ► We use the Sequencer to model data acquisition and control the measurement process. ► We increase the productivity by raising ...the level of abstraction. ► We shift programming from language engineers to the domain experts. ► We successfully apply the Sequencer to the automotive industry.
Data acquisition is the process of capturing and measuring physical data and then converting the results into a digital form that is further manipulated by a computer program. Within the industry, data acquisition systems (measurement systems) are used in a wide variety of fields, including product quality testing. Usually measuring systems are complicated devices, however newer data acquisition systems tend to be easier to use. As such, they open the door for the development of customized software, which can be easily manipulated, not only by programmers but also by domain experts, enabling them to understand and modify programs. Raising the level of abstraction, particularly with those programs that use visual models, can be an effective aid for domain experts, who are then able to model their programs on their own. This paper describes the design and use of a domain-specific modeling language called the Sequencer, integrated with the measuring equipment DEWESoft, which enables domain experts to model their own data acquisitions. Specifically, in this paper the Sequencer is exposed to: domain concepts identification, the construction of modeling notation, a connection with execution framework, and the end-users’ point of view on the modeling tool. The use of the Sequencer will be presented on car brake tests. For this purpose, the Sequencer has already been successfully applied in the automotive industry.
The paper addresses the issue of identifying the technical condition of rotating parts with by means of vibrodiagnostics. This method has been developing rapidly in recent years and it is conceived ...to be used for predicting failure occurrence. This enables us to determine an optimum time to perform machine preventive maintenance. The aim is to determine this point in time for groups of components, such as electric motors, gear boxes, and even combustion engines. In this paper, we focus on monitoring the technical condition of the medium truck bearing box on which we simulate different field conditions. A measuring device, DEWE 50/8, including the DEWEsoft software product of the Dewetron Company, has been used for the actual measurement. Along with the vibrodiagnostics used when determining the technical condition of the bearing box, we have also applied thermography for monitoring thermal changes of individual components. The aim of the research is to determine the moment when a preventive action is to be performed or when to change components before the failure occurs and increases the costs.
