A Way to Improve the Accuracy of Hobbed Involute Gears

2006 ◽  
Vol 129 (10) ◽  
pp. 1076-1085 ◽  
Author(s):  
Stephen P. Radzevich
Keyword(s):  
Automotive Industry ◽  
Analytical Approach ◽  
Design Parameters ◽  
Depth Analysis ◽  
Kinematic Geometry ◽  
Involute Gears ◽  
Computer Codes ◽  
Automobile Transmissions ◽  
Gear Accuracy ◽  
Lower Noise

Involute gears are widely used in the design of machines and mechanisms. Performance of gear transmissions, e.g., performance of automobile transmissions, strongly depends upon the accuracy of gears of which the transmission is comprised. The higher the gear accuracy, the higher performance of the gear transmission observed. An increase of accuracy of involute gears reduces vibration of the transmission, and causes lower noise excitation. A significant amount of gears for the needs of the automotive industry is manufactured by hobbing. Reported in this paper is a way to improve the accuracy of hobbed involute gears that requires an appropriate alteration of design parameters of the hob to be applied. The required correction of design parameters of the hob can be computed on the premises of in-depth analysis of kinematic geometry of meshing of the hob and of the work gear, i.e., of design parameters of the hob, as well as an analysis of kinematics of meshing of the gear work and of the hob. An analytical approach for computation of the required alterations in design parameters of the involute hob is reported in the paper. Using commercial software MathCAD/Scientific, numerous computer codes are developed for performing the necessary computations. A numerical example of computation is presented. The reported results of research are ready to put into production.

Design of a Special-Purpose Hob With Prescribed Value of the Hob-Setting Angle for Machining of Cluster Gear

2006 ◽  
Vol 129 (4) ◽  
pp. 438-444 ◽  
Author(s):  
Stephen P. Radzevich
Keyword(s):  
Analytical Approach ◽  
Design Parameters ◽  
Base Diameter ◽  
Scientific Application ◽  
Neck Width ◽  
Specific Combination ◽  
Setting Angle ◽  
Computer Codes ◽  
Outside Diameter ◽  
Principal Design

This paper aims to develop of a robust analytical approach for computation of the principal design parameters for a special-purpose involute hob for machining of cluster gear. The specific combination of design parameters for a precision hob with particular value of the hob-setting angle is given. This combination of parameters includes (a) the hob outside diameter, (b) the base diameter of the hob, and (c) the required value of the hob-setting angle. The specific combination of these design parameters for the involute hob determined here allows machining of cluster gear with the shortest possible neck width. Numerous computer codes for computation of the design parameters of an involute hob are developed using the commercial software MathCAD-Scientific. Application of the special-purpose hob would allow reduction of size and weight of both the cluster gear itself and the whole gear transmission including housing. The reported results of the research are ready for application in industry.

Optimization of a Shock Absorber Design Using Model-Based Approach

2012 ◽  
Vol 452-453 ◽  
pp. 1351-1355 ◽  
Author(s):  
Grzegorz Wszołek ◽  
Piotr Czop ◽  
Dawid Jakubowski ◽  
Damian Slawik
Keyword(s):  
Automotive Industry ◽  
Shock Absorber ◽  
Flow Characteristic ◽  
Optimization Method ◽  
Design Parameters ◽  
Coupled Models ◽  
Model Based ◽  
Noise Evaluation ◽  
Optimal Values ◽  
Application Scope

The aim of this paper is to demonstrate a possibility to optimize a shock absorber design to minimize level of vibrations with the use of model-based approach. The paper introduces a proposal of an optimization method that allows to choose the optimal values of the design parameters using a shock absorber model to minimize the level of vibrations. A model-based approach is considered to obtain the optimal pressure-flow characteristic by simulations conducted with the use of coupled models, including the damper and the servo-hydraulic tester model. The presence of the tester model is required due to high non-linear coupling of the tested object (damper) and the tester itself to be used for noise evaluation. This kind of evaluation is used in the automotive industry to investigate dampers, as an alternative to vehicle-level tests. The paper provides numerical experimental case studies to show application scope of the proposed method

“IRIS” A Computerized High Head Pump Turbine Design System

1977 ◽  
Vol 99 (3) ◽  
pp. 567-577
Author(s):  
S. Chacour ◽  
J. E. Graybill
Keyword(s):  
Mechanical Design ◽  
Design Parameters ◽  
Design System ◽  
Performance Requirements ◽  
Manufacturing Process Planning ◽  
Depth Analysis ◽  
High Head ◽  
Critical Components ◽  
Limited Input Data ◽  
Turbine Design

“IRIS” is a computerized design and structural optimization system capable of generating all the major hydraulic and mechanical design parameters of high head pump/turbines from limited input data. The program will size the unit and select the proper hydraulic passage configuration according to performance requirements and optimize the dimensions of all the major components, generate command tapes used by a numerically controlled flame cutter, estimate cost, and issue manufacturing process planning. It also generates finite element models for the “in depth” analysis of critical components.

Computer Aided Automotive Interior Design for Kansei Engineering

2011 ◽  
Vol 130-134 ◽  
pp. 504-507 ◽  
Author(s):  
Li Hong Zhu ◽  
Han Zhao ◽  
Xiao Chen Yin ◽  
Li Jun Zhu ◽  
Liang Zhang
Keyword(s):  
Interior Design ◽  
Automotive Industry ◽  
Computer Aided Design ◽  
Design Parameters ◽  
Kansei Engineering ◽  
Computer Aided ◽  
Quantitative Analysis Method ◽  
Aided Design ◽  
Industry Trends ◽  
Automotive Interior

Nowadays, the development of automotive industry trends more personalized and profuse product alternatives. Kansei Engineering has been applied to interior design for customer satisfaction based on ergonomic technology in the paper. The computer aided design automotive interior system includes two subsystems: one is Computer-aided Sensation Survey Subsystem and the other is Computer-aided Automobile Interior Design Subsystem. Mathematical statistics and quantitative analysis method are adopted to establish quantified relationship between product perceptual image and design parameters.

Analysis of Drain Pumping System for Nuclear Power Plants Under Transient Turbine Loads

1975 ◽  
Vol 97 (4) ◽  
pp. 619-627
Author(s):  
G. S. Liao
Keyword(s):  
System Design ◽  
Power Plants ◽  
Analytical Approach ◽  
Careful Consideration ◽  
Operating Conditions ◽  
Cycle Performance ◽  
Design Parameters ◽  
Pressure Decay ◽  
Pumping System ◽  
Tank System

Many nuclear stations do not incorporate deaerators in their feedwater heating systems. To attain high turbine cycle performance without a deaerator, a drain pumping system is widely used for returning hot drains from the high-pressure heaters to the feedwater system. With a greatly increased feedwater flow for nuclear units, together with the drain pumping system being moved to a higher extraction point, the heater–drain tank system will be subject to a rapid pressure decay under turbine load rejections. In addition, the drain pump suction flow reduces considerably, thereby increasing the suction pipe resident time. It is these critical changes in operating conditions that should receive careful consideration in drain pumping system design. This paper presents an analytical approach for determining drain tank pressure decay, drain pump suction pressure decay, and transient behavior of the heater–drain tank system based on analysis of closed feedwater heater performance and the varying feedwater temperature entering the heater under turbine load rejections. The emphasis is placed on adequate and optimum design of a drain pumping system, including a discussion of some design criteria to be followed, as well as sizing of the pressure equalizer between heater and drain tank. All mathematical equations required for determining the design parameters are derived. Finally, some example calculations are given to illustrate the application of the developed analytical approach to system design.

Effect of Flow Channel Design on Planar SOFC Performance

2010 ◽  
Author(s):  
Choongmo Yang ◽  
Dohyung Kim ◽  
Junghwang Jun ◽  
Samdeuk Choi ◽  
Jung-Eui Lee
Keyword(s):  
Mass Transfer Rate ◽  
Channel Modeling ◽  
Flow Channel ◽  
Cell Performance ◽  
Design Parameters ◽  
Bottom Surface ◽  
Fuel Utilization ◽  
Channel Design ◽  
Surface Geometry ◽  
Depth Analysis

For a planar SOFC interconnect, channel design parameters such as channel width, depth, numbers, wall conditions, etc. are strongly related to the overall cell performance in the way of fuel utilization. Heat and mass transfer rate can be improved by flow mixing enhancement in the properly designed flow channel. In this paper, the influence of flow channel parameters on cell performance in SOFC is discussed. The flow aerodynamic characteristics and friction loss from the bottom surface geometry considered using a three-dimensional computational modeling method. Specially the effect of channel depth and channel mixing on performance and fuel utilization is investigated with an in-depth analysis. As well as a simplified single channel to see the detailed phenomena, an interconnect including whole channels and manifold hole are simulated. The results including a comparison between experimental data and simulation show that to reduce side loss enhanced cell performance with flow and temperature distribution. Based on the result of channel modeling, single cell test with modified design is conducted to achieve performance improvement. This work can be helpful in understanding the channel flow and provide a valuable guideline to channel design for a planar SOFC.

Construction, performance, and thermal design of plate heat exchangers

2009 ◽  
Vol 223 (3) ◽  
pp. 123-131 ◽  
Author(s):  
M A Mehrabian
Keyword(s):  
Heat Exchangers ◽  
Close Agreement ◽  
Thermal Design ◽  
Design Parameters ◽  
Final Decision ◽  
Process Data ◽  
Design Data ◽  
Plate Heat ◽  
Computer Codes

Much of design data for plate heat exchangers remain proprietary. A step by step methodology for determination of the exchanger size and internal geometry from the knowledge of process data is scarce. Commercial computer codes do not give the user accessibility to mathematical modelling. Engineers do not usually understand the terminology and geometry of these exchangers. This article presents a manual method for thermal design of plate heat exchangers based on physically meaningful estimations, calculations, and comparisons. When there is no close agreement, it may be necessary to change one or more of the design parameters, i.e. channel (passage) velocities, wall temperatures, or corrugation inclination angle. Considerable skill and judgment is required by the thermal design engineer at this stage to decide how the tentative design should be changed to provide a rapid solution. The experienced design engineer is often able to judge on the final decision from the first or second trial designs.

scholarly journals Efficient in-depth analysis and optimum design parameter estimation of MEMS capacitive pressure sensor utilizing analytical approach for square diaphragm

2021 ◽  
Author(s):  
SUMIT KUMAR JINDAL ◽  
ISHAN PATEL ◽  
KRISH SETHI ◽  
SIMRIT KAUL ◽  
SREEKANTH P K ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Pressure Sensors ◽  
Optimal Operation ◽  
Design Parameters ◽  
Capacitive Pressure Sensor ◽  
Computationally Efficient ◽  
Analytical Technique ◽  
Operating Modes ◽  
Depth Analysis ◽  
Piezoresistive Pressure Sensors

Abstract Capacitive pressure sensors have become more popular as compared to piezoresistive pressure sensors as they yield superior sensitivity and lesser non-linearity. Efficient analysis for modelling capacitive pressure sensors is thus increasingly becoming more important due to their innumerable use cases. The higher sensitivity of square diaphragm for the same side length in comparison to circular diaphragm makes it ideal for sensor design. In this work, a complete formulation for analysis of capacitive pressure sensor with the square diaphragm in normal and touch mode operation has been presented as these two modes are established operating modes for these sensors. A comprehensive study of sensor parameters like capacitance, diaphragm deflection, capacitive and mechanical sensitivity has been formulated to aid the choice of sensor characteristics. This work also focuses on the method to determine core design parameters for optimal operation. Computationally complex methods have been used in the past for analysis of square diaphragms. In contrast to the finite element system, the analytical technique proposed in this study is less complex and computationally efficient (FEM). The results were computed and simulated using MATLAB.

scholarly journals Human Mind and its Psychological Disposition:

2021 ◽  
Vol 39 (- 2) ◽  
Author(s):  
Sabeen Akber ◽  
Shumaila Mazhar
Keyword(s):  
Comparative Literature ◽  
Comparative Analysis ◽  
Human Nature ◽  
Analytical Approach ◽  
Research Study ◽  
Human Mind ◽  
Freudian Psychoanalysis ◽  
Depth Analysis ◽  
Human Psyche ◽  
Psychological Disposition

The current paper aims to provide the venue to the spiritual insights of Ghazalian thought to be integrated into the study of Freudian psychoanalysis. The study has adopted descriptive and analytical approach to make a comparative analysis of Ghazalian concept of nafs e lawwamma and Freudian superego.  Zepetnek’s (1998) theory of comparative literature has provided the guidelines for an in depth analysis of both the models.  This analytical approach may lead to an alternative critical agenda for the better understanding of human psyche. Moreover, the present study emanates from the assumption that though Freudian psychoanalytic theory has provided insightful psychological considerations, equally appropriate readings will possibly result from analyzing Ghazalian theory of soul. Simultaneously, it is also hoped that the insights yielded by this research study may open new panoramas for the study of human nature.

scholarly journals Effect of Helix Angle on the Gear Design Parameters in Helical Gears

2019 ◽  
Vol 8 (10) ◽  
pp. 887-890
Keyword(s):  
Helix Angle ◽  
Contact Stresses ◽  
Design Parameters ◽  
Screw Compressor ◽  
Bending Stress ◽  
Contact Ratio ◽  
Helical Gears ◽  
Gear Design ◽  
Overlap Ratio ◽  
Lower Noise

Screw compressor demands quite operation. For getting lower noise it is important to have higher contact ratio. Contact ratio can be increased by increasing the Helix angle i .e. indirectly increasing overlap ratio. The paper represents the effect of change in design parameters with respect to helix angle with the keeping same module and same centre distance. Higher helix angle leads lower bending and contact stresses. The study was conducted for screw electrical compressor. Gear was design for fixed parameters except helix angle. Also the contact stresses are analyzed (FEA) on ANSYS. The result from the calculation and FEA are compared for contact stress as well as bending stress.

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