نشریه مهندسی مکانیک و ارتعاشات
سال دهم شماره 1 (پیاپی 34، بهار 1398)

Sheet metal forming (SMF) is the most important metal forming areas which is used in various industries. SMF is formed by integrated rigid molds, due to happen desired plastic deformation in raw material. Those molds which are drawn and fabricated for one component has specific geometry characteristics. But for production of various shapes, we need to use different molds.so, It is not suitable and economical method for manufacturing decreasing costs such as waiting time, design, developing and production, there is flexible method which is named incremental forming (IF). IF can cover many restrictions and problems. In last decades, IF is noticed by many engineers and researchers because IF is modern method in SMF.

Machine tool chatter causes machining instability, surface roughness, and tool wear in metal cutting processes. A stability lobe diagram based on regenerative chatter theory is an effective tool to predict and control chatter. Stability diagrams can be applied in machining processes to optimize the maximum depth of cut at the highest available spindle speed. These diagrams are formed by a series of intersected scallop-shaped borderlines of stability. The intersections of the lobes denote the deepest stable cuts at various ranges of spindle speed. The creation of a stability lobe diagram requires lengthy procedures and calculations. This paper presents a simple method to analytically calculate the approximate optimum depths of cut and determine the corresponding spindle speeds. This method allows machine operators to practically choose cutting parameters, instructors to effectively teach the regenerative chatter theory, and students to easily create stability lobe diagrams and practice optimizing cutting parameters. The characteristics and limitations of the stability lobe diagram are discussed.

Recently accurate model based on the current voltage (IV) solar cells, the main focus is to attract researchers. The basic form of the model accurately, the lack of information on the exact values of model parameters, for example the optical diode saturation current, series resistance, parallel resistance and diode ideal factor. In order to create a good agreement between experimental data and results. Using a technique optimizing parameter identification is required. Due to the non-linearity of the curve (IV) in solar cells, an optimization technique is required. In this paper, based on parameter identification methods to identify unknown parameters of a single diode modules and two diode solar cells is used. The concept is simple, easy implementation and high performance of the main reasons HBB_BC reputation in solving complex problems, optimization. For this purpose, HBB_BC algorithm to determine the unknown parameters of the model to be used. HBB_BC detailed studies of the effects by means of different techniques will be examined. HBB_BC algorithm simulation results better than other algorithms in models of solar cells revealed

Today, in modern technology and highly efficient building new science of nanotechnology is introduced as an important benefit numerous applications of nanotechnology can be noted in the construction industry. The ultimate goal of the study of materials at the nanoscale, finding a new class of materials with high performance, which can be defined as materials with high performance and multi-functional. The multi-purpose function, the emergence of new and different properties than conventional material properties so that the materials can provide various applications. Nanotechnology in the construction industry also plays an important role in this regard, most of the steel, glass and concrete play. The technological achievements smart materials can be used in the generation, transmission, and consumption of energy storage with high performance noted. Experts believe nano science, technology, science new horizons will open into the human world, especially in the field of construction materials. In this paper, the research is based on literature review and Internet searches, analytical methods are available; We tried to introduce nano-materials and their application building industry, on how the nano-material technologies of building infrastructure with the definition of pay for the sustainability of the built environment.