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.

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.

scholarly journals A Shock Mitigation of Pedestrian-Vehicle Impact Using Active Hood Lift System: Deploying Time Investigation

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Tae-Hoon Lee ◽  
Gun-Ha Yoon ◽  
Seung-Bok Choi
Keyword(s):  
Response Time ◽  
Design Parameters ◽  
Passenger Vehicle ◽  
Governing Equations ◽  
Total Response Time ◽  
Shock Mitigation ◽  
Vehicle Impact ◽  
Driving Speed ◽  
Working Principle ◽  
Principal Design

This paper investigates the deploying time (or response time) of an active hood lift system (AHLS) of a passenger vehicle activated by gunpowder actuator. In this work, this is accomplished by changing principal design parameters of the latch part mechanism of the hood system. After briefly introducing the working principle of the AHLS operated by the gunpowder actuator, the governing equations of the AHLS are formulated for each different deploying motion. Subsequently, using the governing equations, the response time for deploying the hold lift system is determined by changing several geometric distances such as the distance from the rotational center of the pop-up guide to the point of the latch in the axial and vertical directions. Then, a comparison is made of the total response time to completely deploy the hood lift system with the existing conventional AHLS and proposed AHLS. In addition, the workable driving speed of the proposed AHLS is compared with the conventional one by changing the powder volume of the actuator.

Landing efficiency control of a six-degree-of-freedom aircraft model with magnetorheological dampers: Part 1—Modeling

2020 ◽  
pp. 1045389X2094257
Author(s):  
Byung-Hyuk Kang ◽  
Ji-Young Yoon ◽  
Gi-Woo Kim ◽  
Seung-Bok Choi
Keyword(s):  
Lagrange Equation ◽  
Degree Of Freedom ◽  
Magnetorheological Damper ◽  
Dynamic Equations ◽  
Design Parameters ◽  
Coordinate Frame ◽  
Aircraft Model ◽  
Efficiency Control ◽  
Six Degree Of Freedom ◽  
Principal Design

This work presents landing efficiency control of a six-degree-of-freedom aircraft model, which has a controllable landing gear system with magnetorheological damper. Due to lengthy contents, this work is divided into two parts. In Part 1, both the kinematic and dynamic equations of the six-degree-of-freedom aircraft model are derived. After determining the principal design parameters of magnetorheological damper based on commercial Beechcraft Baron B55 (passive oleo-strut type) damper, the kinematic equations are derived using the aircraft body coordinate frame and homogeneous coordinates of the reference frame, while the dynamic equations are derived using Euler–Lagrange equation to represent the heave, roll, and pitch motions of the aircraft model. In Part 2, the landing performance based on landing efficiencies is analyzed through the landing motions using various controllers.

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.

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.

Investigation of variable geometry orifice design for improving centrifugal compressor low-end performance and stable operating range

2021 ◽  
pp. 095441002110476
Author(s):  
Ben Zhao ◽  
Qingjun Zhao ◽  
Xiaorong Xiang ◽  
Wei Zhao ◽  
Jianzhong Xu
Keyword(s):  
Numerical Simulations ◽  
Centrifugal Compressor ◽  
Control Device ◽  
Design Parameters ◽  
Variable Geometry ◽  
Flow Area ◽  
Stall Margin ◽  
Setting Angle ◽  
Compressor Inlet ◽  
Two Parameters

Active control of the inlet flow area in a centrifugal compressor is a method to improve compressor aerodynamic performance and stall margin. As a core part of the area control device, the variable geometry orifice is investigated and its two key design parameters are analyzed in detail, the setting angle of the orifice with respect to the shroud casing and the radial height of the orifice to the shroud casing from the orifice inner rim. This paper proposes a physics-based equation that describes the relationship of the two parameters with compressor mass flow rate and then validates the equation using numerical simulations. As far as the setting angle, the physics-based equation suggests not to be larger than 90°. The numerical results not only validate the physics-based equation but also show the most optimal angle of 78°. In terms of the orifice height, both the physics-based equation and the numerical simulations suggest an active height control of orifice in the compressor inlet duct.

scholarly journals Characterization of a high-speed radio-frequency sampling and demultiplexing circuit based on the cascade connection of pin photodiodes

2019 ◽  
pp. 939-949
Author(s):  
CARLOS VILLA ANGULO ◽  
IVAN OLAF HERNANDEZ-FUENTES ◽  
RICARDO MORALES-CARBAJAL ◽  
RAFAEL VILLA-ANGULO ◽  
JOSE RAMON VILLA-ANGULO
Keyword(s):  
Radio Frequency ◽  
High Speed ◽  
Optical Power ◽  
Theoretical Models ◽  
Design Parameters ◽  
Cascade Connection ◽  
Application Requirements ◽  
Pin Photodiodes ◽  
Principal Design

Herein, we apply theoretical models to characterize the transfer function and frequency response of a complex optoelectronic circuit that comprises a primary ultrafast sampling circuit followed by a cascade connection of N demultiplexing stages. The successive radio-frequency optoelectronic samplers were based on the cascade connection of positive-intrinsic-negative-photodiodes (PIN-PDs). We developed a procedure to calculate the principal design parameters that allows us to use optical power for each sampling and demultiplexing stage, such that the circuit can be designed based on the application requirements. The results obtained from the theoretical models were compared with the measurements obtained from the 2.5 GS/s sampling circuit connected in cascade with a 1.25 GS/s and a 625 MS/s demultiplexing circuit implemented using commercial PIN-PDs

Multi-Objective Optimization of a Steam Surface Condenser Using the Territorial Particle Swarm Technique

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Pooya Mirzabeygi ◽  
Chao Zhang
Keyword(s):  
Particle Swarm ◽  
Design Parameters ◽  
Cfd Analysis ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Flow And Heat Transfer ◽  
Surface Condenser ◽  
Computational Fluid Dynamics Cfd ◽  
Shell And Tube ◽  
Outside Diameter

The multi-objective territorial particle swarm optimization (MOTPSO) technique is proposed in this work for the optimal design of steam surface condensers. The main objective of this work is to maximize the condensation rate in a condenser while the pressure loss is minimized. Various design parameters, such as the tube outside diameter, thickness, and pitch, are considered to find the optimal ones for shell and tube heat exchangers considered in this study. The two-dimensional computational fluid dynamics (CFD) analysis is performed to solve the fluid flow and heat transfer in the condenser to assess the performance of different designs.

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