Testing, Analysis and Classification of No-Dig Manhole Rehabilitation Materials

Gravity flow wastewater collection systems are comprised of sewer pipes and manholes. Failure of a manhole may have catastrophic consequences such as developing a sinkhole in the street and roadway, and at a minimum, wastewater flow will be blocked, and stream of the manhole will backup causing a sanitary sewer overflow (SSO). Improving structural conditions of a manhole is critical to minimize these types of failures. This paper considers the impact of several lining materials including cement mortar, epoxy, polyurethane, cured-in-place composites, and a multi-layer structure material on increasing the structural capabilities of deteriorated manholes. The tasks included in this research consist literature search and, preliminary laboratory and main testing of select manhole rehabilitation materials. A finite element analysis is included to complement the experiments. Several preliminary tests according to ASTM C-39 on coated concrete cylinders, and ASTM C-293 on lined concrete beams, were performed at UT Arlington's Center for Underground Infrastructure Research and Education (CUIRE) Laboratory. The test results showed significant increase in the performance of concrete samples under compression and flexure. A second round of testing was performed on 4-ft long, 24-in. diameter concrete pipe sections with 3-in. wall thickness manufactured according to ASTM C-76. These pipe sections were lined internally with the same materials as the preliminary tests, and tested according to ASTM C-497 under Three-Edge-Bearing testing. Using computer data acquisition system, strain gages and displacement extensometers, stress/strain data were measured. The results showed that tested No-Dig manhole rehabilitation materials can significantly improve structural performance of deteriorated manholes.

Control and data acquisition system for the rolling machine

Rolling machines are often used for forming flat elements or pipes. Problems occur when used to produce cylindrical elements other than pipes, or when experimental materials are used. It is required to introduce flexible control of the rolling process parameters in such cases. It is necessary to monitor the device operating parameters. When a rolling machine works with experimental materials, there are no typical control and acquisition data systems available. The article presents the concept and capabilities of the control and computer data acquisition system supporting the rolling process. The main task of software system is acquisition of force and kinetic parameters related to the analysed process of the compression during rolling. This system allows current recording and analysis of five physical values. The acquisition data application is developed in National Instruments LabVIEW environment. The software algorithm is based on the state machine. The article contains a detailed description of hardware and software implementation of the functions mentioned.

Synchronized Diagnosis of Laser-Pulse MAG Hybrid Arc Based on Multi-Information

Laser-Arc Hybrid welding technology was first introduced by English scholar W.M.Steen in 20th century 70s, developed very rapidly. In order to study the effect mechanism of laser and arc,This paper presents a control strategy,the strategy can collect welding electric information, high speed photos and spectral information synchronously. By using the Labview software, industrial computer, data acquisition card, a high speed camera, spectrometer, synchronous multi-information acquisition system of welding has been established.the system has been used for the hybrid welding experiment, the peak value, base value and platform value of the laser-arc hybrid welding has been collected. Laid the foundation for further diagnosis of laser-arc in a variety of state.

Modular System for Testing the Stability and Safety of Specialised Height Rescue Vehicles

The article describes the structure and the principles of operation of the test system for the investigation of safety of height rescue equipment used by rescue services. The system is composed of a portable computer, data acquisition block and measurement modules equipped with own power supply sources and radio transmission modules. Some of the modules constitute original, mechatronic measurement devices with specific metrological properties. The system is intended particularly for accreditation tests for height rescue equipment used by Fire Brigades.

Development of Detection Platform for Grid-Connected Photovoltaic Inverters

To ensure both performance and security of grid-connected photovoltaic inverters(PVI), a detection platform for grid-connected PVI is researched. The testing method and procedures of grid-connected PVI are analyzed and the development course of this detection platform is described in detail. The detection platform consists of control computer, data acquisition system, RS 485 and GPIB system. In this platform, the solar-cell panel is simulated by programmable DC source, the power grid characteristics of power grid by programmable DC source and the load characteristic by programmable controlled RLC load. The whole detection system is controlled by LabVIEW software interface. The proposed detection platform can be used in the testing of electric performance, protection function, EMC and so on. Practical application shows that the configuration of this detection platform is rational and reliable，and its detection results are accurate.