Open Access Original Research Article

FEM Based Modal and Harmonic Response Study of Stepped Shaft Having Cracks and Optimize Using ANN Method

Asha Kumawat, K. B. Waghulde, Sanjay Kumawat

Journal of Engineering Research and Reports, Page 1-12
DOI: 10.9734/jerr/2020/v14i117112

In the present research study, modal and harmonic response analysis is performed for a stepped shaft made of SS-304 material using the FEM simulation technique. In the present study crack effect is also considered to find the role of cracks during modal analysis. Total six mode shapes are considered in this study and 500 N force is considered for harmonic response analysis. The simulation is performed using Ansys WB based APDL solver. The main outcome for this study is the critical speed of shaft for rotation from 10 RPM to 80K RPM, stress, deformation of the shaft without crack, and with crack. The selected shaft is stepped in nature, total length of shaft is 300 mm having three diameters of 20 mm, 40 mm, and 60 mm. The natural frequency for all six node shapes is from 1000 Hz to 4000 Hz having deformation from 15 mm to 30 mm approx for all combinations of crack in the shaft. After all simulation it is found that for all mode shapes, the stability and strength of the shaft are good during vibration conditions.

Open Access Original Research Article

Building Information Model (BIM) Implementation in Perspective of Kazakhstan: Opportunities and Barriers

Dayana Aitbayeva, Md. Aslam Hossain

Journal of Engineering Research and Reports, Page 13-24
DOI: 10.9734/jerr/2020/v14i117113

The construction industry is characterized by low productivity with low technological advances, minimum automation and computerization. Building Information Modeling (BIM) as a means of technological innovation, has the great potentials to improve productivity, decrease project cost and shorten project delivery time. The initiative to implement BIM in Kazakhstan construction industry has sparked widespread interest recently. This study aims to identify the opportunities and barriers to implementing BIM in construction companies in Kazakhstan. A comprehensive literature search, interviews with leading construction companies and a survey among other construction companies in Kazakhstan were conducted to understand the barriers and opportunities of BIM adoption in Kazakhstan. The study reveals that the BIM adoption level in Kazakhstan is very low and there exists a number of challenges and lack of clear guidelines to implementing BIM. The study maps BIM implementation barriers in other countries with Kazakhstan by careful investigation of literature search, interviews and the survey results. The research also proposes a BIM implementation roadmap to be followed by the construction companies in Kazakhstan and other similar countries.

Open Access Original Research Article

A Study of Dispense Needle for Die Attach Voids Mitigation

R. Rodriguez, B. C. Bacquian, F. R. Gomez, E. Graycochea Jr.

Journal of Engineering Research and Reports, Page 25-29
DOI: 10.9734/jerr/2020/v14i117114

The need of data storage devices and new technologies continues to grow with more robust and stable functioning capability. With that, improvement and utilization never stop for a seamless output. One device that is currently on new product introduction is a quad-flat no-leads (QFN) utilizing a tapeless leadframe technology. The new device used highly conductive glue with metal spacer and has experienced gross glue voids defect parts per million (ppm). Glue voids were measured for cumulative voids criteria, with values higher compared to the specification. The study used analysis of variance (ANOVA) on the dispense needle diameter and revealed the effect levels of needle diameter on cumulative voids reduction. For subsequent works, the configuration could be applied for packages with similar requirement.

Open Access Original Research Article

Design and Implementation of a Wireless Fluid Level Display System Using Ultrasonic Sensing Technique

Gesa F. Newton, Terwase I. Aondona, C. A. Chile

Journal of Engineering Research and Reports, Page 30-40
DOI: 10.9734/jerr/2020/v14i117116

The wireless fluid level indicator comprises a sensing and transmitting circuit for detecting and transmitting the levels of fluids from a container to the receiving circuit which receives and displays the amount of the measured volume. This has been achieved using an ultrasonic sensor (HC-SR04), a firmware (PIC16F648A/PIC16F876A microcontroller programmed in C/assembly languages), an encoder (HT12E) and a radio frequency (RF) transmitter transmitting at a bandwidth of 433MHz to an RF receiver interfaced with a decoder (HT12D), liquid crystal display (LCD) and a Buzzer. The device when tested measured water levels and transmitted same over a distance of up to 98.5 meters in open areas and up to 50 meters in highly obstructed areas. The average response time was also estimated to be 0.1 second. As a contact-less depth detection system, the device finds useful applications in measurement of fluid levels in homes and industries where concentrates, table water, transmission oils are produced, without affecting the chemical or physical properties of such substances-an advantage over the contact methods used in fluid level detection.

Aims: To design and implement a wireless microcontroller based fluid level display system using ultrasonic sensing method.

Study Design: By encoding the Transmitter module to sense and detect the amount of water level, while the decoder module decodes the received data and display the result.

Place and Duration of Study: Department of Physics, University of Agriculture Makurdi, Benue State, Nigeria, between November 2018 and April 2019.

Methodology: An RF transceiver, encoder/decoder (HT12E/HT12D), a 2x16 Liquid display module, 4MHz crystal oscillator, a buzzer and other peripherals were interfaced to two 8-bit controllers; PIC16F648A and PIC16F876A. The controllers were programmed in C/Assembly languages to enable effective communication of the system. The system was then calibrated to read and transmit water level values from a 30-centimeter deep tank over a distance of 1.0 - 98.5 meters.

Results: The system was tested to have maximum sensitivity over a distance of 98.5 meters in non-obstructed areas and 50 meters in obstructed areas. The average response time was also estimated to be 0.5 seconds.

Conclusion: The design and implementation of a wireless fluid level display system using ultrasonic sensing technique has been successfully done. The system workability is suitable for deployment and usage in domestic and industrial purposes.

Open Access Review Article

Studying the Appropriate Underground Mining Methods in Sukari Gold Mine

Almoataz Bellah M. Khalifa, Mohamed A. Gouda, Mohamed A. Yassin

Journal of Engineering Research and Reports, Page 41-50
DOI: 10.9734/jerr/2020/v14i117117

This paper represents an attempt to study mining methods and development in the area of underground mining in Sukari gold mine. Detailed mining and rock mechanics data had been collected from Sukari gold mine to select the appropriate mining method for underground area. Underground mining methods have been studied to show that the selected mining method in SUKARI gold mine is suitable for the geology of the ore body, and hence proposed mining method could be taken into account. A brief background about Sukari gold mine is given and the used mining method in Sukari gold mine has been approved. Some of the suitable mining methods are discussed according to selection method and the most appropriate one is listed. Mining method selection was done by UBC method and Hartman flow chart.