scholarly journals Numerical and Experimental Investigation of Temperature Distribution for Dry-Clutches

Machines ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 185
Author(s):  
Fei Meng ◽  
Junqiang Xi
Keyword(s):  
Temperature Field ◽  
Temperature Measurement ◽  
Working Conditions ◽  
Heat Dissipation ◽  
Structure Design ◽  
Transient Temperature ◽  
Measurement Technology ◽  
Element Analysis ◽  
Sensing Technology ◽  
Friction Disc

The temperature rise of the engaging clutch during shifting depends heavily on the transmitted torque. Precisely estimating the clutch temperature not only improves clutch control but also the optimal design of the clutch. However, the contact surface of the friction lining is closed, and the surface temperature is often difficult to measure accurately. In this study, a theoretical model of a two-dimensional transient temperature field for the friction disc has been established. In the radial and axial directions under different launching conditions, the temperature field of a friction disc is investigated. Four stages of clutch engagement have been determined, and finite-element analysis has been used to study the temperature field of a single clutch and to determine its duration.Then, the latest internationally developed distributed optical fiber sensing technology is used to perform measurement tests on the designed dry clutch friction characteristic test rig. The distributed fiber-optic temperature measurement technology can accomplish accurate temperature measurement with fast response speed and can acquire temperature value on different radii of friction discs with high spatial resolution. Such temperature sensing technology is very suitable for clutch working conditions. By analyzing the simulation and experimental results of temperature variation of different radii, different working conditions and different components, an important reference is provided for the establishment of the clutch temperature model and the optimization of the clutch heat dissipation structure design.

Two-Dimension Temperature Field Reconstruction in Furnace by Acoustic Method

2012 ◽  
Vol 249-250 ◽  
pp. 170-174 ◽  
Author(s):  
Li Na Jia ◽  
Yan Gao ◽  
De Cai Lu
Keyword(s):  
Temperature Field ◽  
Temperature Measurement ◽  
Measurement Data ◽  
Acoustic Method ◽  
Measurement Technology ◽  
Reconstruction Method ◽  
Two Dimension ◽  
Accuracy Of Measurement ◽  
Temperature Measurement System ◽  
Temperature Field Reconstruction

Acoustic temperature measurement technology is a new temperature measuring technology which is rising in recent years. This paper discusses a kind of reconstruction method of temperature field based on acoustic pyrometer. First , acoustic sensors has been used to obtain measurement data, and the technique of wavelet has been used to denoise in order to improve the accuracy of measurement , secondly, the least-squares algorithm has been used to reconstruct temperature field. Finally, we work out our own acoustic temperature measurement system and has got the satisfying result using our own acoustic pyrometer to detect two-dimension temperature field in the laboratory.

Study on the Influence of Temperature and Stress Field to PCB’s Modal

2012 ◽  
Vol 271-272 ◽  
pp. 1441-1445
Author(s):  
Qin Luo ◽  
Su Juan Zhang ◽  
Xiao Zhang
Keyword(s):  
Temperature Field ◽  
Stress Field ◽  
Modal Analysis ◽  
Heat Flux Density ◽  
Heat Dissipation ◽  
Transient Temperature ◽  
Electronic Products ◽  
Transient Stress ◽  
Transient Temperature Field ◽  
Pcb Design

With the increasing integration of electronic products, the heat flux density is increasing. Research on the heat dissipation of the PCB attracts more attention. Temperature field of the electronic products always changes a lot, usually leading to a transient stress field in the PCB. Due to the transient temperature field and transient stress field, the PCB’s modal changed. In this paper, the temperature field and the stress field are obtained to explain the reason of the change. The influence on PCB’s modal caused by the temperature field and the stress field are analyzed, on the basis of PCB’s thermal modal analysis, which provide a reference for the PCB design and modal analysis in the future.

Study on the Temperature Field of Jet Plug-in Hot Blast Furnace

2011 ◽  
Vol 338 ◽  
pp. 231-235
Author(s):  
Xue Ping Wang ◽  
Zhen Wei Zhang ◽  
Hong Bo Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Blast Furnace ◽  
Heat Exchange ◽  
Negative Impact ◽  
Structure Design ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Hot Blast

This paper primarily focuses on the analysis on the heat exchange part’s temperature field of the jet plug-in hot blast furnace aiming at obtaining the temperature distribution of the heat exchange part. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, local high temperature of the heat exchange part can be figured out. The paper also analyzes the parts with great temperature difference, study the reasons of causing these phenomenon and the negative impact on the furnace. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

Finite Element Analysis of Temperature Field of Traction Motor

2012 ◽  
Vol 189 ◽  
pp. 461-464
Author(s):  
An Xing Zhu ◽  
Zhi Xiong Yang ◽  
Yi Cui
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Temperature Field ◽  
Convective Heat Transfer Coefficient ◽  
Transient Temperature ◽  
Iron Core ◽  
Field Calculation ◽  
Three Dimension ◽  
Element Analysis ◽  
Traction Motor

Due to the fact of immeasurable inner temperature of inverter-fed traction motor, three-dimension finite element model of part of rotor iron core and half a rotor bearing were established. The convective heat transfer coefficient between the air gap of motor and rotor surface were calculated by the heat transfer and fluid mechanics theory. The influence of temperature rise on the stator and rotor resistance was considered for thermal loss calculation. The influence of the end of stator and rotor on axial temperature distribution was also taken into account. Then three-dimensional transient temperature field of the motor was simulated at the rated load. Temperature field with different loads was also computed. The aim has been to optimize the design with respect to the transient stresses. According to contrastive analysis compared with other method, it demonstrated the accuracy of simulation model and thermal field calculation results.

Temperature Field Due to a Moving Heat Source: A Moving Mesh Finite Element Analysis

1985 ◽  
Vol 52 (2) ◽  
pp. 274-280 ◽  
Author(s):  
Z.-B. Kuang ◽  
S. N. Atluri
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Heat Source ◽  
Process Zone ◽  
Surrounding Medium ◽  
Moving Mesh ◽  
Transient Temperature ◽  
Moving Heat Source ◽  
Element Analysis ◽  
External Agent

The transient temperature field (as seen by a moving observer) due to a moving heat source, such as the process zone near a dynamically propagating crack tip or an external agent as in the case of welding, is analyzed by a moving-mesh finite element procedure. The effects of the temperature-dependent material properties, and of the loss of heat to the surrounding medium through convection and radiation, are studied. Situations under which conditions in the process zone may be labeled as “isothermal” or “adiabatic” are explored. Estimates of temperature rise near the tip of a crack propagating at realistic speeds in structural steels are made.

Thermal Characteristic Analyses of NC Machine Spindle System

2012 ◽  
Vol 479-481 ◽  
pp. 2481-2484 ◽  
Author(s):  
Zhong Qi Sheng ◽  
Xiang Dong Shi ◽  
Sheng Li Dai ◽  
Yan Jin
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Thermal Deformation ◽  
Thermal Characteristic ◽  
Numerical Control ◽  
Transient Temperature ◽  
Element Analysis ◽  
Spindle System ◽  
Nc Machine ◽  
Machine Spindle

This paper used finite element method to analyze thermal characteristics of numerical control (NC) machine spindle system, and studied the steady temperature field and the transient temperature field of the machine tool and the thermal deformation of the spindle at 3000 rpm. General finite element analysis software ANSYS is used for analysis. Through the analysis of the temperature field and thermal deformation of the spindle system, this paper finally obtained the deformation situation of the spindle system in thermal load. By changing the boundary conditions of the spindle system to analyze the heat distortion of the spindle system and the results showed that assembling a cooling jacket in front of the spindle box can signally reduce the thermal error of the spindle system.

Estimation of formation temperature and thermal property from dissipation of heat generated by drilling

Geophysics ◽  
1982 ◽  
Vol 47 (11) ◽  
pp. 1577-1584 ◽  
Author(s):  
Tien‐Chang Lee
Keyword(s):  
Heat Dissipation ◽  
Temperature Drop ◽  
Drill Hole ◽  
Circulation Rate ◽  
Thermal Conductivity Ratio ◽  
Transient Temperature ◽  
Formation Temperature ◽  
Drilling Mud ◽  
Depth Of Penetration ◽  
Element Analysis

Dissipation of heat generated in the process of drilling depends upon the physical properties and condition of the rock and drilling mud, drilling rate and duration, mud circulation rate, casing, and depth of penetration. By treating the initial condition as an instantaneous temperature drop near the bottom of a drill hole, an analytical solution is obtained to show drilling‐induced heat dissipation. Two graphical methods are presented and illustrated with examples to determine, from transient temperature measurements, the equilibrium formation temperature as well as insitu thermal conductivity ratio and diffusivity of rock and drilling mud. One method requires the measurement of initial mud temperature [Formula: see text], while the other method requires knowing the thermal diffusivity of drilling mud [Formula: see text]. Either [Formula: see text] or [Formula: see text] can also be estimated with the trial‐and‐error procedure. A finite‐element analysis is further developed to handle thermal disturbance for the case where the temperature drop is not necessarily instantaneous; hence the solution is applicable at any depth in a drill hole.

Research on Temperature Field of Variable Frequency Motor

2013 ◽  
Vol 273 ◽  
pp. 355-359
Author(s):  
Yao Hui Wu ◽  
Xiao Mei Liu ◽  
Xiu Feng Meng ◽  
Hong Tu Zhao
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Induction Motor ◽  
Temperature Rise ◽  
Experimental Tests ◽  
Transient Temperature ◽  
Variable Frequency ◽  
Element Analysis ◽  
Finite Element Software ◽  
Frequency Power

To the problem of small induction motor that supplied by Variable frequency power temperature rise, according to the basic theory of heat transfer and using finite element analysis software, in the paper, it established a motor of two-dimensional transient temperature field model ,though the equivalent simplify of the structure and thermal conductivity, and the compare between the simulation of finite element software studies and the temperature experimental tests , It confirms the affect that variable frequency power on the motor temperature rise, and finds a simplified simulation of motor temperature field and parameters equivalent approach which do provide effective help to the design and use of the induction motor.

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