Study on Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses | Chapter 02 | Technological Innovation in Engineering Research Vol. 2

 When constructing a reliable quantitative (RQ) specification, this study shows how parametric accelerated life testing (ALT) may be used to uncover design defects in mechanical devices. It consists of four components: (1) a system BX lifetime for which X of a product population fails, developed using the parametric ALT scheme, (2) fatigue and redesign, (3) adapted ALTs with design alternations, and (4) a determination of whether the system design(s) achieve the objective BX lifetime. As a consequence, a life-stress model is provided, as well as a sample size formulation. A mass/energy balance on the vapor-compression cycle was explored to assess the compressor's pressure loading and perform parametric ALT. The compressor failed during the first ALT owing to a damaged or fractured suction reed valve constructed of Sandvik 20C. Steel made of carbon (1 wt percent C, 0.25 wt percent Si, 0.45 wt percent Mn). Due to an overlap between the suction reed valve and the valve plate, as well as frequent pressure loading, the suction reed valves were tired. To fix the problem, the valve plate's trespan dimensions, tumble process, ball peening, and brushing processes were employed. Due to interference between the crankshaft and thrust washer, the compressor locked at the second ALT. The heat treatment on the outside of the cast iron crankshaft was indicated in the corrective action plan (0.45 wt percent C, 0.25 wt percent Si, 0.8 wt percent Mn, 0.03 wt percent P). Following these design adjustments, there were no difficulties during the third ALT.

Author(S) Details

Seongwoo Woo
Department of Mechanical Engineering, College of Electrical and Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa P.O. Box-16417, Ethiopia.

Dennis L. O’Neal
Department of Mechanical Engineering, School of Engineering and Computer Science, Baylor University, Waco, TX 76798-7356, USA.

Yimer Mohammed Hassen
Department of Mechanical Engineering, College of Electrical and Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa P.O. Box-16417, Ethiopia.

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Study on Improving the Reliability of a Domestic Refrigerator Compressor Subjected to Repetitive Loading| Chapter 6| Recent Developments in Engineering Research Vol. 9

The Parametric Accelerated Life Test (ALT) was used to determine the life of a commercial refrigerator's newly built compressor subjected to repeated pressure loading. It consists of (1) a product BX lifetime parametric ALT plan that will be X percent of the cumulative loss, (2) ALT load analysis, (3) a tailored sequence of parametric ALTs with design adjustments, and (4) determining if the product design(s) achieves the target BX lifetime. A generalised life-stress failure model and a new sample size equation with a new load definition were derived based on the basic refrigeration cycle. Using the equation of the sample size with the acceleration factor also allowed The design of this test can allow an engineer to uncover the design parameters that affect reliability during the compressor system design process. As a result, businesses should help boost product life and prevent recalls due to product defects in the field. A newly-designed compressor was used as a test case in a commercial refrigerator. Finally, to define and correct the design issues of a mechanical device, engineers may use parametric ALT.

Author (s) Details

Seong-Woo Woo
Faculty of Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.

Dennis L. O’Neal
School of Engineering and Computer Science, Baylor University, Waco, Texas, USA.

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Studies on Energy Management for Compressed Air in Cement Industry by Using Lean Principle | Chapter 6 | Emerging Trends in Engineering Research and Technology Vol. 11

 Power is an ultimate source for all tasks to be done. It is described as the skill or power to do  Job, such as the ability by the application of force to shift an object. In a range, energy can exist  Electrical, mechanical, chemical and thermal forms. Energy is not going to be made, but it can be  Transformed from one to the next. Small energy resources India has approximately 1% of India's energy resources.  Global energy supplies, however, account for 16% of the world's population. The manufacturing sector accounted for 51 percent of the total. In 2007, global energy demand was delivered and is expected to rise by an average annual 1.3 percent [worrell Ernst 2004]. Approximately half of all industrial energy usage is used in energy intensive manufacturing in particular processes. In all process industries, compressors are the instruments that play a major role and are also one of the major power consuming fields. Using the required layout, this paper seeks to recognise and eliminate routine waste that causes higher energy consumption in the cement process industry (ULTRA TECH CEMENTS-RDCW).

Author (s) Details

M. Shunmathi
Thiagarajar College of Engineering, Madurai, India.


M. Tamilarasan
Thiagarajar College of Engineering, Madurai, India.

K. A. Arirajan
Thiagarajar College of Engineering, Madurai, India.


M. Siva
Thiagarajar College of Engineering, Madurai, India.


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