many factors affect yield loss in wheat harvesting with a grain combine harvester and there is no mathematical model to describe the behavior of this complex system. thus in this study, a fuzzy logic controller (flc) was designed, implemented and tested for the automatic settings of cylinder speed, concave clearance, fan speed and forward speed of a model 955 john deere combine. first, the mech...

an s-curve to describe the gradual transition between exhaust pressure and intake or inlet pressure. The start of compression, which marks the end of the intake process, does not necessarily occur at the same time as the close of the intake valve (IVC). The intake valve closes after bottom center (BC) while the volume in the cylinder is decreasing. The engine speed determines the point at which...

An experimental study was conducted to suppress the unsteady vortex shedding from a circular cylinder by using a traveling wave wall (TWW). The leeward surfaces of the circular cylinder model were replaced by wave surfaces, which can move to form symmetrical TWW when driven by a motor system. The propagation speed of the wave was adjustable by controlling the rotational speed of the motor. Duri...

An inverter controlled refrigeration system with a variable speed compressor is more efficient. In order to improve its efficiency and reliability in wide range of speed, a comprehensive simulation model for an inverter rotary compressor with single cylinder or dual cylinder is developed. The simulated results are compared with measured data. The variations of cooling capacity, input power, COP...

The complete mitochondrial genome of the big-eye thresher shark was sequenced using a polymerase chain reaction (PCR)-based method. The total length of mitochondrial DNA is 16,719 bp and includes 13 protein-coding genes, 2 ribosomal RNA, 22 transfer RNA genes, 1 replication origin region and 1 control region. The mitochondrial gene arrangement of the big-eye thresher shark is the same as the on...

Current corn kernel-cob bonding mechanics models (LSD models) uniformly consider the force changes during maize threshing operation as an elastic change, resulting in computational errors of up to 10% or more discrete element simulations. Due inability perform high-precision simulation characteristics operation, core operating parameters thresher (rotation speed component) rely mainly on empiri...

The impact of card cylinder speed, card production rate and draw frame doubling on cotton yarn quality parameters was investigated by using the BoxBehnken experimental design. It was found that yarn tenacity, elongation and hairiness increase by increasing the number of draw frame doubling up to a certain level and then decrease by further increase in doubling. Yarn unevenness increased by incr...

The present study focuses on the effect of air-fuel ratio on the performance of four cylinder hydrogen fueled direct injection internal combustion engine. GT-Power was utilized to develop the model for direct injection engine. Air-fuel ratio was varied from rich limit to a lean limit. The rotational speed of the engine was varied from 1250 to 4500 rpm. The acquired results shown that the air fu...

The separated flow around a rotating circular cylinder is investigated by the discrete vortex method combined with the boundary layer theory. The Keller Box method is used to solve the laminar boundary layer in order to determine the separation points on the upper and the lower sides of the rotating circular cylinder. The nascent vortices are then introduced near the separation points. A discre...

This paper deals with the development, technical and financial analysis of a locally available small size solar photovoltaic DC powered paddy thresher. The threshing machine was developed at Workshop Machinery Maintenance (WMM) divisional Bangladesh Rice Research Institute (BRRI), Gazipur, during 2021. Locally materials 1 hp motor were used to develop technology. thresher tested reduce dependen...