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Online since: July 2014
Authors: Yong Guo Sun, Yu Wang, Guan Long Zhang, Yun Li
The way of evolution will only lead to four agencies changes of the transmission ratio, and will not affect the overall performance.
In the process of inversion also exist many factors impact on it resulting changes in the structure, by the equivalence principle topology, topological inversion of RV transmission is divided into the following several aspects: The Ring Number of the Single Tooth Topological structure inversion topological structure for RV transmission in a single tooth ring number under different conditions, as shown in Figure 11.
Topological inversion map of a RV transmission According to the topology equivalence theory, the derived topological properties of new configuration derived are the same with the original RVtransmission is the same.
Journal of mechanical design, 2000 03:24-26 [3] Liu Pengbo.
Journal of mechanical transmission, 2012, 4 (5) : 33-36.
In the process of inversion also exist many factors impact on it resulting changes in the structure, by the equivalence principle topology, topological inversion of RV transmission is divided into the following several aspects: The Ring Number of the Single Tooth Topological structure inversion topological structure for RV transmission in a single tooth ring number under different conditions, as shown in Figure 11.
Topological inversion map of a RV transmission According to the topology equivalence theory, the derived topological properties of new configuration derived are the same with the original RVtransmission is the same.
Journal of mechanical design, 2000 03:24-26 [3] Liu Pengbo.
Journal of mechanical transmission, 2012, 4 (5) : 33-36.
Online since: December 2009
Authors: Yong Bo Wu, Jian Hui Qiu, Takashi Sato, Wei Min Lin
A series of experiments was subsequently carried out on the apparatus to investigate how
the surface roughness of the workpieces, the welding time, and the normal welding pressure affect the
actual welding area and the tensile strength of the welded workpieces.
Introduction In recent years, as the demand for small and light mechanical products has increased more and more in various industries, thermoplastic polymer materials have been extensively used to replace metallic materials due to their excellent properties such as high mechanical strength, light weight, and high corrosion resistance.
(a) (b) Fig. 3 Illustration (a) and photograph (b) of the constructed experimental apparatus (a) Sheet (b) Left workpiece (c) Right workpiece Fig.4 Dimensions of the sheet and workpieces In order to validate the proposed method and examine the performance of the constructed apparatus, a series of experiments was carried out to investigate how the surface roughness of the workpiece welding face, the workpiece protrusion length, the welding time, and the normal force affect the welding area and the mechanical strength of the joined plastic workpiece.
This means that the welding (ultrasonic vibration) time is quite an important factor and the value of T=2 s is too long to obtain a temperature over the melting point of the plastic materials in the current conditions.
A series of experiments was subsequently carried out on the apparatus to investigate how the work-surface roughness, the welding time, and the normal welding pressure affect the actual welding area and the tensile strength of the welded workpieces.
Introduction In recent years, as the demand for small and light mechanical products has increased more and more in various industries, thermoplastic polymer materials have been extensively used to replace metallic materials due to their excellent properties such as high mechanical strength, light weight, and high corrosion resistance.
(a) (b) Fig. 3 Illustration (a) and photograph (b) of the constructed experimental apparatus (a) Sheet (b) Left workpiece (c) Right workpiece Fig.4 Dimensions of the sheet and workpieces In order to validate the proposed method and examine the performance of the constructed apparatus, a series of experiments was carried out to investigate how the surface roughness of the workpiece welding face, the workpiece protrusion length, the welding time, and the normal force affect the welding area and the mechanical strength of the joined plastic workpiece.
This means that the welding (ultrasonic vibration) time is quite an important factor and the value of T=2 s is too long to obtain a temperature over the melting point of the plastic materials in the current conditions.
A series of experiments was subsequently carried out on the apparatus to investigate how the work-surface roughness, the welding time, and the normal welding pressure affect the actual welding area and the tensile strength of the welded workpieces.
Online since: March 2008
Authors: Masanori Kikuchi, Ze Jian Xu, Yu Long Li
Introduction
Dynamic fracture and dynamic shear localization (or adiabatic shear banding) are the two major
failure modes of materials subjected to high-rate mechanical loading [1].
Many experimental efforts have been reported on the determination of DFT and dynamic fracture properties of a variety of materials [6-12], and a number of theoretical models and criteria for dynamic fracture and shear localization have been suggested [13-16] up to now.
In this paper, dynamic fracture properties in both Mode I and Mode II of two high strength steels, 40Cr and 30CrMnSiNi2A, are investigated with a combined experimental-numerical method.
Temporal evolution of the dynamic stress intensity factor (DSIF) of each specimen was calculated and then the DFT was evaluated according to the fracture initiation time at different loading rates.
Materials and experimental procedure The chemical composition of the steels for investigation is given in Table 1, and the mechanical properties are shown in Table 2.
Many experimental efforts have been reported on the determination of DFT and dynamic fracture properties of a variety of materials [6-12], and a number of theoretical models and criteria for dynamic fracture and shear localization have been suggested [13-16] up to now.
In this paper, dynamic fracture properties in both Mode I and Mode II of two high strength steels, 40Cr and 30CrMnSiNi2A, are investigated with a combined experimental-numerical method.
Temporal evolution of the dynamic stress intensity factor (DSIF) of each specimen was calculated and then the DFT was evaluated according to the fracture initiation time at different loading rates.
Materials and experimental procedure The chemical composition of the steels for investigation is given in Table 1, and the mechanical properties are shown in Table 2.
Online since: March 2011
Authors: Bernd-Arno Behrens, Sven Hübner, Richard Krimm, Christian Wager, Milan Vucetic, Teguh Cahyono
Hereby the commercial simulation code of ANSYS CFX was employed to determine the properties of the cylinder and the valve.
This affects both the quality of cutting edges of shearing, the mechanical properties in the deep drawing such as local necking or wrinkling, as well as the maximum achievable drawing ratios.
The performance of the cylinder i.e. maximum force amplitude and frequency of oscillation depends mainly on the properties of the valve.
Anhören Umschrift In order to determine the properties of the valve a computational fluid dynamics simulation has been done using the commercial code of ANSYS CFX.
Mechanical Engineering Science, Vol. 219 (2005), p. 83-91 [6] M.
This affects both the quality of cutting edges of shearing, the mechanical properties in the deep drawing such as local necking or wrinkling, as well as the maximum achievable drawing ratios.
The performance of the cylinder i.e. maximum force amplitude and frequency of oscillation depends mainly on the properties of the valve.
Anhören Umschrift In order to determine the properties of the valve a computational fluid dynamics simulation has been done using the commercial code of ANSYS CFX.
Mechanical Engineering Science, Vol. 219 (2005), p. 83-91 [6] M.
Online since: June 2022
Authors: Jian Quan Liang, Jian Zhang, Wei Sun, Yang Zhou, Yue Wang
Glass fibre reinforced PA66 composite material has many advantages such as excellent mechanical properties, small specific gravity, superior electrical insulation performance and easy processing and melding [1].
Analysis of Forging Performance of Electric Power Fittings under Extreme Cold Conditions Forging process plan Through the study of the forging forming process of the CrMo trunnion hanging plate, the influence of the forging temperature (initial forging and final forging temperature) and the degree of pre-forming deformation of free forging on the structure and mechanical properties of the hardware is optimized.
Tensile mechanical properties data.
Research into impacts of extremely cold climates on properties of basalt plastic rods - sciencedirect.
Thermal comfort range and influence factor of urban pedestrian streets in severe cold regions.
Analysis of Forging Performance of Electric Power Fittings under Extreme Cold Conditions Forging process plan Through the study of the forging forming process of the CrMo trunnion hanging plate, the influence of the forging temperature (initial forging and final forging temperature) and the degree of pre-forming deformation of free forging on the structure and mechanical properties of the hardware is optimized.
Tensile mechanical properties data.
Research into impacts of extremely cold climates on properties of basalt plastic rods - sciencedirect.
Thermal comfort range and influence factor of urban pedestrian streets in severe cold regions.
Online since: January 2007
Authors: Sug Won Kim, Khalil Abdel-Razek Khalil
Effects of temperature and the
addition of 3YSZ on the toughness, hardness and microstructure properties have been studied.
3YSZ second phase toughening HAp composites with higher toughness were successfully
developed at relatively low temperatures through this technique.
However, HAp possesses low mechanical strength and fracture toughness, which is an obstacle to its applications.
A suitable method for improving the mechanical properties is based on the synthesis of composites made of HAp and other second phases [2-6].
The factor KIC was determined using the direct crack measurement method [11].
Despite the decomposition temperature of HAp should be the same in both specimens, adding 20vol% 3YSZ powder affected the maximum sintering temperature and the decomposition temperature of HAp3YSZ composites.
However, HAp possesses low mechanical strength and fracture toughness, which is an obstacle to its applications.
A suitable method for improving the mechanical properties is based on the synthesis of composites made of HAp and other second phases [2-6].
The factor KIC was determined using the direct crack measurement method [11].
Despite the decomposition temperature of HAp should be the same in both specimens, adding 20vol% 3YSZ powder affected the maximum sintering temperature and the decomposition temperature of HAp3YSZ composites.
Online since: June 2013
Authors: Sebastian Skoczypiec, Dominik Wyszyński, Piotr Lipiec
The last one is more and more often applied because of unusual and unique properties of the laser beam [2].
These properties enable performing precise operations on difficult to cut materials in low cost and time consuming way.
Realization of these task is strongly related to knowledge about the properties of laser radiation and material physical and chemical characterization.
The extent of these effects primarily depends on the characteristic of laser beam and the thermo-physical properties of the material.
Vertical step C is dependent on laser power, pulse frequency, cutting speed (shape) and material properties.
These properties enable performing precise operations on difficult to cut materials in low cost and time consuming way.
Realization of these task is strongly related to knowledge about the properties of laser radiation and material physical and chemical characterization.
The extent of these effects primarily depends on the characteristic of laser beam and the thermo-physical properties of the material.
Vertical step C is dependent on laser power, pulse frequency, cutting speed (shape) and material properties.
Online since: August 2014
Authors: Amin Nazarian Shahrbabaki, Behrooz Shahriari, Ali Shahriari
Gas Turbine Fault Detection and Isolation Using Adaptive Nuerofuzzy Inference System (ANFIS)
Behrooz Shahriari1,a, Amin Nazarian Shahrbabaki2,b and Ali Shahriari3,c
1,2,3 Department of Mechanical & Aerospace Engineering, Malek-Ashtar University of Technology, Isfahan, Iran
ashahriari@mut-es.ac.ir, banazarian@mut-es.ac.ir, cal.shahriari@gmail.com
Keywords: Fault detection and isolation, Adaptive nuerofuzzy, Gas turbine, Rowen’s model.
In this paper, three types of faults have been considered, fault in the fuel flow rate, fault in the performance of turbine which affects the turbine exit gas temperature, and fault in the turbine which affects the turbine output torque.
In particular, three fault cases have been considered, namely: · Fault Type 1: Fault in the fuel flow rate, (fuel control valve fault ), f1(t); · Fault Type 2: Turbine damage (which affects the turbine exit temperature), f2(t); · Fault Type 3: Turbine damage (which affects the turbine output torque), f3(t).
However, this is still considerably longer than the duration of the GT dynamics which occur over periods of seconds, a factor which must be taken account of in any FDI algorithm design.
If the residual set can isolate all faults, it can be said that the residual set has the required isolation property [5].
In this paper, three types of faults have been considered, fault in the fuel flow rate, fault in the performance of turbine which affects the turbine exit gas temperature, and fault in the turbine which affects the turbine output torque.
In particular, three fault cases have been considered, namely: · Fault Type 1: Fault in the fuel flow rate, (fuel control valve fault ), f1(t); · Fault Type 2: Turbine damage (which affects the turbine exit temperature), f2(t); · Fault Type 3: Turbine damage (which affects the turbine output torque), f3(t).
However, this is still considerably longer than the duration of the GT dynamics which occur over periods of seconds, a factor which must be taken account of in any FDI algorithm design.
If the residual set can isolate all faults, it can be said that the residual set has the required isolation property [5].
Online since: January 2012
Authors: Fumiyoshi Minami
- Level II (normal assessment): this is applied to those cases where the mechanical properties and the crack geometry in the component are known, but the Weibull parameter m is not available.
These properties are explained in terms of 1) the effect of YR on stress fields for the wide plate and toughness specimen and 2) a volumetric effect of m on the Weibull stress sW [3, 8].
It was assumed that the heat-affected zone (HAZ) has the same strength as the base metal (BM) or 10% higher strength.
On the other hand, the stress field in the HAZ for FL crack is affected by the strength mismatch: overmatch condition induces a constraint activating the HAZ stress field
The procedure to determine the correction factor r is given in Annex R in BS 7910.
These properties are explained in terms of 1) the effect of YR on stress fields for the wide plate and toughness specimen and 2) a volumetric effect of m on the Weibull stress sW [3, 8].
It was assumed that the heat-affected zone (HAZ) has the same strength as the base metal (BM) or 10% higher strength.
On the other hand, the stress field in the HAZ for FL crack is affected by the strength mismatch: overmatch condition induces a constraint activating the HAZ stress field
The procedure to determine the correction factor r is given in Annex R in BS 7910.
Online since: June 2015
Authors: Mohamad Deraman, Rusli Daik, Sepideh Soltaninejad, Rakhmawati Farma, Nur Hamizah Basri, Mohd Amir Radhi Othman, Najah Syahirah Mohd Nor, Awitdrus Awitdrus, Nurul Fatin Mamat
Summary of properties and availability of EFB fibers can be found elsewhere [23, 24, 25, 26].
It was concluded that this equation was too simple and a modification was necessary to be made by including the ratio between microcrystallite stack height to its stack width, ratio of activation time to maximum activation time, and also normalization factors in the equation.
Carbon aerogels as electrode material for electrical double layer supercapacitors—Synthesis and properties.
Physical and Electrochemical Properties of Supercapacitor Electrodes Derived from Carbon Nanotube and Biomass Carbon.
Electrical and mechanical properties of carbon pellets from acid (HNO3) treated self-adhesive carbon grain from oil palm empty fruit bunch.
It was concluded that this equation was too simple and a modification was necessary to be made by including the ratio between microcrystallite stack height to its stack width, ratio of activation time to maximum activation time, and also normalization factors in the equation.
Carbon aerogels as electrode material for electrical double layer supercapacitors—Synthesis and properties.
Physical and Electrochemical Properties of Supercapacitor Electrodes Derived from Carbon Nanotube and Biomass Carbon.
Electrical and mechanical properties of carbon pellets from acid (HNO3) treated self-adhesive carbon grain from oil palm empty fruit bunch.