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Online since: July 2014
Authors: Yan Hua Ren, Xiu Feng Liu, Ji Liang Fan, Gang Wu, Jun Li, Shi Chong Zhou
The effect of limited soil is a significant factor, which directly effect the attribution and magnitude of active soil pressure.
Take the point of earth pressure below the surface as the inflection point, and assuming the lower excavation does not affect the calculation of the horizontal force the upper horizontal support[2].
Physical and mechanical properties of the soil are shown in Table 1.
Take the point of earth pressure below the surface as the inflection point, and assuming the lower excavation does not affect the calculation of the horizontal force the upper horizontal support[2].
Physical and mechanical properties of the soil are shown in Table 1.
Online since: February 2012
Authors: Jun Li Wang, Wei Dong Zhao, Mei Lian Liang
(ZPMC) aims at building the development platform and simulation model with independent intellectual property rights, the world’s first intelligent and high efficient tridimensional rail terminal transmission system, and lays the foundation for industrialization [1].
These equipments such as QCs and gantry cranes will directly affect the efficiency of handling system.
Besides, they are relevant to the number of tracks which affect the number of trolleys from the scheme of ZPMC.
Initially, containers wait QCs for lifting and all mechanical equipments are idle.
Performance evaluation Handling equipments are the main equipments of the transmission system so their operating efficiency is the key factor that affects its overall efficiency.
These equipments such as QCs and gantry cranes will directly affect the efficiency of handling system.
Besides, they are relevant to the number of tracks which affect the number of trolleys from the scheme of ZPMC.
Initially, containers wait QCs for lifting and all mechanical equipments are idle.
Performance evaluation Handling equipments are the main equipments of the transmission system so their operating efficiency is the key factor that affects its overall efficiency.
Online since: August 2013
Authors: Yong Jian Wang, Jing Feng Chen, Si Qin Li
Therefore, with the help of computer and in order to obtain a more accurate simulation data, it is necessary to find appropriate way to build up the simulation model of fuel common rail injection system, to study this system working pressure’s impact factors, which is caused by the changes in different operating conditions (revolving speed, load, etc.) and working parameters (e.g. injection volume).
Based on comprehensive analysis the whole structure and working principle of fuel common rail injection system, taking 7RT-flex60C marine intelligent diesel engine (manufactured by Wärtsilä company) for example, This thesis applies Matlab/Simulink software to build up fuel common rail injection system simulation model, analyzes the relating impact factors, takes simulating test by using this model, then the simulation results are comparative analysis to the official rack test data.
Eq.1 is the mathematical model of fuel nozzle cavity designed on the base of injector structure characteristic of 7RT-flex60C Marine intelligence diesel engine and liquid flow dynamics principle[4]: (1) in the formula:- nozzle cavity fuel pressure;-nozzle cavity volume;-fuel oil elastic modulus ,700-1000MPa;- the fuel flow injecting to combustion chamber, volume flow;- fuel flow from measuring piston to fuel injector nozzle, volume flow;-fuel volume variation caused by system parts’ mechanical movement.
To ensure the extendibility and reusability of fuel common rail injection system simulation model, in accordance with its function several sub modules in the system are divided, the whole system model is constituted by means of every sub module’s interaction and connection, which one module improved will not affect the others.
Sensitivity analysis of transient diesel engine simulation Proceedings of the Institution of Mechanical Engineers.2006, 220(D), p:89-101
Based on comprehensive analysis the whole structure and working principle of fuel common rail injection system, taking 7RT-flex60C marine intelligent diesel engine (manufactured by Wärtsilä company) for example, This thesis applies Matlab/Simulink software to build up fuel common rail injection system simulation model, analyzes the relating impact factors, takes simulating test by using this model, then the simulation results are comparative analysis to the official rack test data.
Eq.1 is the mathematical model of fuel nozzle cavity designed on the base of injector structure characteristic of 7RT-flex60C Marine intelligence diesel engine and liquid flow dynamics principle[4]: (1) in the formula:- nozzle cavity fuel pressure;-nozzle cavity volume;-fuel oil elastic modulus ,700-1000MPa;- the fuel flow injecting to combustion chamber, volume flow;- fuel flow from measuring piston to fuel injector nozzle, volume flow;-fuel volume variation caused by system parts’ mechanical movement.
To ensure the extendibility and reusability of fuel common rail injection system simulation model, in accordance with its function several sub modules in the system are divided, the whole system model is constituted by means of every sub module’s interaction and connection, which one module improved will not affect the others.
Sensitivity analysis of transient diesel engine simulation Proceedings of the Institution of Mechanical Engineers.2006, 220(D), p:89-101
Online since: October 2018
Authors: Abde Fattah Seyam, Mark Pankow, Mohamad Midani
Introduction
Fiber composites have high specific mechanical properties; this feature is mainly due to the synergy between the fiber and the polymer matrix.
However, these mechanical properties can be significantly reduced after impact.
Yet, increasing the pick density, was the only significant factor in the X-direction.
In-plane and through-thickness properties, failure modes, damage and delamination in 3D woven carbon fibre composites subjected to impact loading.
Low velocity impact properties of 3D woven basalt/aramid hybrid composites.
However, these mechanical properties can be significantly reduced after impact.
Yet, increasing the pick density, was the only significant factor in the X-direction.
In-plane and through-thickness properties, failure modes, damage and delamination in 3D woven carbon fibre composites subjected to impact loading.
Low velocity impact properties of 3D woven basalt/aramid hybrid composites.
Online since: February 2016
Authors: Francesca Di Puccio, Enrico Ciulli
One reason can be found in the intrinsic complexity of the phenomenon and in the number of factors affecting the local interactions between two surfaces in contact, as lubrication conditions, material hardness, surface roughness, and so on.
The theoretical aspects of the contact are previously introduced in order to have complete indications on the mechanical aspect of the phenomenon.
In order to investigate the influence of the material properties and he surface roughness on the tribological behaviour of these contact couplings, six discs and six specimens were manufactured.
Materials and samples properties and labels.
As far as the material combination is concerned, couplings were classified on the basis the equivalent modulus of the coupling E’, i.e., according to Hertz’s theory, (1) where E is the elastic modulus, n the Poisson’s ratio (reported in Table 1) and the subscripts c and d refer to the cylinder and disc properties, respectively.
The theoretical aspects of the contact are previously introduced in order to have complete indications on the mechanical aspect of the phenomenon.
In order to investigate the influence of the material properties and he surface roughness on the tribological behaviour of these contact couplings, six discs and six specimens were manufactured.
Materials and samples properties and labels.
As far as the material combination is concerned, couplings were classified on the basis the equivalent modulus of the coupling E’, i.e., according to Hertz’s theory, (1) where E is the elastic modulus, n the Poisson’s ratio (reported in Table 1) and the subscripts c and d refer to the cylinder and disc properties, respectively.
Online since: July 2017
Authors: Shanmugasundaram Sankar, V. Kumaresan Manivarma, Arun Thampi
They also suggested that the main factors affecting the biodiesel yield are; molar ratio of alcohol to oil, catalyst concentration, reaction temperature and reaction time.
Ramadhas, Muraleedharan and Jayaraj [7] have analysed the important properties of methyl esters of rubber seed oil and compared with other esters and diesel.
Experiments Fuel Properties.
They were tested for their properties and one of them found to be closely matched with that of diesel. 2.
Pramanik, Properties and use of jatropha curcas oil and diesel fuel blends in compression ignition engine, Renewable Energy, 28 (2003) 239–248
Ramadhas, Muraleedharan and Jayaraj [7] have analysed the important properties of methyl esters of rubber seed oil and compared with other esters and diesel.
Experiments Fuel Properties.
They were tested for their properties and one of them found to be closely matched with that of diesel. 2.
Pramanik, Properties and use of jatropha curcas oil and diesel fuel blends in compression ignition engine, Renewable Energy, 28 (2003) 239–248
Online since: July 2014
Authors: Cherng Shing Lin, Chih Chung Lai
Firefighting Tactics during a Fire Event at a Nightclub
Cherng-Shing Lin1, a, Chih-Chung Lai2, b
1~2Department of Mechanical Engineering, Yuan Ze University, Taoyuan 32003, Taiwan (R.O.C.)
Therefore, fire hazards often result in severe casualties and property loss.
The results of this analysis can be used to formulate/analyze the firefighting and rescue tactics for similar fires, which would decrease the risk of disaster occurrence and increase rescue efficiency, thereby reducing casualties and property loss.
The material properties were set based on the FDS 5 manual [7].
The spread of the smoke particles and the decline in the smoke layer heights reduced visibility, affecting the ability of the occupants to identify the escape direction.
Therefore, fire hazards often result in severe casualties and property loss.
The results of this analysis can be used to formulate/analyze the firefighting and rescue tactics for similar fires, which would decrease the risk of disaster occurrence and increase rescue efficiency, thereby reducing casualties and property loss.
The material properties were set based on the FDS 5 manual [7].
The spread of the smoke particles and the decline in the smoke layer heights reduced visibility, affecting the ability of the occupants to identify the escape direction.
Online since: December 2024
Authors: O. Bavani, P. Harish, S. Lakshmi Narasimha, P. Akhila Devi, T.S. Girish Kumar, K. Mani Bharath Achari
Gupta, A., & Singh, R.[1] Focused on the mechanical properties of the stabilized soil, particularly in terms of shear strength and compressive strength.
Their research focused on the mechanical properties of the stabilized soil, particularly in terms of shear strength and compressive strength.
Specific Gravity Test by Pycnometer 3.3.1 Moisture Content Test The moisture content of the soil samples was determined by the oven-drying method according to[12] IS:2720 Part 2 - 1973.The moisture content of soil is a crucial parameter that affects its engineering properties.
Results and Discussions 4.1 Testing of soil properties without stabilizers Before the addition of Fly Ash, GGBS, and Stone Dust stabilizers, the soil sample underwent various tests to determine its inherent properties.
This analysis is crucial for understanding the soil's grading and texture, essential factors in assessing its suitability for engineering and construction applications.
Their research focused on the mechanical properties of the stabilized soil, particularly in terms of shear strength and compressive strength.
Specific Gravity Test by Pycnometer 3.3.1 Moisture Content Test The moisture content of the soil samples was determined by the oven-drying method according to[12] IS:2720 Part 2 - 1973.The moisture content of soil is a crucial parameter that affects its engineering properties.
Results and Discussions 4.1 Testing of soil properties without stabilizers Before the addition of Fly Ash, GGBS, and Stone Dust stabilizers, the soil sample underwent various tests to determine its inherent properties.
This analysis is crucial for understanding the soil's grading and texture, essential factors in assessing its suitability for engineering and construction applications.
Online since: April 2025
Authors: Bishweshwar Babu, Neil Saju, T. Dilip Castro, D. Rohit
These structures and nanomaterials in general are of great interest as, at this scale, they exhibit exceptional physical and chemical properties that are fundamentally different from bulk materials [1-2].
(4) where Ks is the shear correction factor.
In other words, the size of the structure played a role in moderating the impact of the strain gradient on its mechanical behavior.
These insights contribute to a better understanding of how the second-order NSGT affects the structural behavior of SWCNTs.
(eds) Carbon Nanotubes: Synthesis, Structure, Properties, and Applications, Springer, Berlin, Heidelberg, 2001, pp. 391-425
(4) where Ks is the shear correction factor.
In other words, the size of the structure played a role in moderating the impact of the strain gradient on its mechanical behavior.
These insights contribute to a better understanding of how the second-order NSGT affects the structural behavior of SWCNTs.
(eds) Carbon Nanotubes: Synthesis, Structure, Properties, and Applications, Springer, Berlin, Heidelberg, 2001, pp. 391-425
Online since: April 2013
Authors: Da Wei Liu, Rong Chao Jiang, Yue Dong Yang, Song Wang
There are a variety of road friendliness evaluations, such as dynamic load factor, dynamic load stress factor[1] and 95 percentage fourth power of the aggregate force[2], etc. when using these evaluation indicators, the accurate tire load must be obtained.
The PSD parameters are difficult which affects the simulation result.
The pavement roughness rational function power spectral density Gq(n) in the spatial frequency n1properties of the stationary random process.
Cebon, Truck suspension design to minimize road damage, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 210, 2 (1996) 95-107
Besselink, Magic Formula tyre model with transient properties, Vehicle System Dynamics, 27, Suppl (1997) 234- 249.
The PSD parameters are difficult which affects the simulation result.
The pavement roughness rational function power spectral density Gq(n) in the spatial frequency n1
Cebon, Truck suspension design to minimize road damage, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 210, 2 (1996) 95-107
Besselink, Magic Formula tyre model with transient properties, Vehicle System Dynamics, 27, Suppl (1997) 234- 249.