Constant Velocity [CV] Joints are one of the most important components of front wheel drive axles. It is subjected to various stresses such as bending stress, shear stress and bearing stress. Apart from these stresses...Constant Velocity [CV] Joints are one of the most important components of front wheel drive axles. It is subjected to various stresses such as bending stress, shear stress and bearing stress. Apart from these stresses, it is also subjected to vibrations, due to out of balance tire or wheel and an out of round tire or wheel, or a bent rim. The main objective of this work is to reduce the stiffness of the damper, so that the damper can withstand within the required constraints [i.e. the forced frequency range of 80 Hz to 150 Hz]. The free vibrational and forced vibrational effects are investigated to predict the resonance phenomenon of the damper. Finite Element Analysis in ANSYS-11 software was performed to predict the dynamic behavior of the system under the required vibrational frequencies ranging from 80 Hz to 150 Hz at given loading conditions.展开更多
Exchange of data in networks necessitates provision of security and confidentiality.Most networks compromised by intruders are those where the exchange of data is at high risk.The main objective of this paper is to pr...Exchange of data in networks necessitates provision of security and confidentiality.Most networks compromised by intruders are those where the exchange of data is at high risk.The main objective of this paper is to present a solution for secure exchange of attack signatures between the nodes of a distributed network.Malicious activities are monitored and detected by the Intrusion Detection System(IDS)that operates with nodes connected to a distributed network.The IDS operates in two phases,where the first phase consists of detection of anomaly attacks using an ensemble of classifiers such as Random forest,Convolutional neural network,and XGBoost along with genetic algorithm to improve the performance of IDS.The novel attacks detected in this phase are converted into signatures and exchanged further through the network using the blockchain framework in the second phase.This phase uses the cryptosystem as part of the blockchain to store data and secure it at a higher level.The blockchain is implemented using the Hyperledger Fabric v1.0 and v2.0,to create a prototype for secure signature transfer.It exchanges signatures in a much more secured manner using the blockchain architecture when implemented with version 2.0 of Hyperl-edger Fabric.The performance of the proposed blockchain system is evaluated on UNSW NB15 dataset.Blockchain performance has been evaluated in terms of execution time,average latency,throughput and transaction processing time.Experimental evidence of the proposed IDS system demonstrates improved performance with accuracy,detection rate and false alarm rate(FAR)as key parameters used.Accuracy and detection rate increase by 2%and 3%respectively whereas FAR reduces by 1.7%.展开更多
A model of fuel injection adjustment for balancing the 4-stroke six cylinder diesel engine coupling geneset is developed by detecting imbalance in operating engine by the frequency analysis of the crankshaft＇s speed ...A model of fuel injection adjustment for balancing the 4-stroke six cylinder diesel engine coupling geneset is developed by detecting imbalance in operating engine by the frequency analysis of the crankshaft＇s speed variation. In this work, the crankshaft is considered to be a rigid body, so that the variation of its angular speed could be directly correlated to the total gas-pressure torque. By analyzing only the lower harmonic orders, the speed variation spectrum can filter out the distortions produced by the dynamic response of the crankshaft. The information carried by these harmonic orders permits to establish correlations between measurements and the average gas pressure torque of the engine, and to detect imbalance and identify faulty cylinders. Detailed experimental reading are taken on diesel engine coupling genset on the test bed of Greaves Cotton Ltd Pane, India.展开更多
The chassis frame is the backbone of a heavy commercial vehicle(HCV).Its main purpose is to securely carry the determined load under all designed operative situations.Thus,it should be rigid enough to withstand the va...The chassis frame is the backbone of a heavy commercial vehicle(HCV).Its main purpose is to securely carry the determined load under all designed operative situations.Thus,it should be rigid enough to withstand the various forces acting on it.The objective of this study was to develop a stiffness model to select an optimum cross section with determined torsional stiffness.Johnson’s method of optimization was adapted to develop a stiffness equation and select a section with a determined torsional stiffness and a requiredmass constraint.The stiffness obtained from the developed stiffnessmodel and finite element analysis(FEA)is a close match,which proves the validity of the proposed model.The section with the maximum torsional stiffness was used for frame-level optimization to improve the torsional and lateral stiffness of the overall chassis frame.The strain energy absorption capacity of the cross member improved by changing the section of the cross member.By using the optimized section,the torsional stiffness of the frame improved by 44%and a lateral stiffness of 10%was obtained.The Creo software was used for modeling and FEA was performed with the Hypermesh software.展开更多
文摘Constant Velocity [CV] Joints are one of the most important components of front wheel drive axles. It is subjected to various stresses such as bending stress, shear stress and bearing stress. Apart from these stresses, it is also subjected to vibrations, due to out of balance tire or wheel and an out of round tire or wheel, or a bent rim. The main objective of this work is to reduce the stiffness of the damper, so that the damper can withstand within the required constraints [i.e. the forced frequency range of 80 Hz to 150 Hz]. The free vibrational and forced vibrational effects are investigated to predict the resonance phenomenon of the damper. Finite Element Analysis in ANSYS-11 software was performed to predict the dynamic behavior of the system under the required vibrational frequencies ranging from 80 Hz to 150 Hz at given loading conditions.
文摘Exchange of data in networks necessitates provision of security and confidentiality.Most networks compromised by intruders are those where the exchange of data is at high risk.The main objective of this paper is to present a solution for secure exchange of attack signatures between the nodes of a distributed network.Malicious activities are monitored and detected by the Intrusion Detection System(IDS)that operates with nodes connected to a distributed network.The IDS operates in two phases,where the first phase consists of detection of anomaly attacks using an ensemble of classifiers such as Random forest,Convolutional neural network,and XGBoost along with genetic algorithm to improve the performance of IDS.The novel attacks detected in this phase are converted into signatures and exchanged further through the network using the blockchain framework in the second phase.This phase uses the cryptosystem as part of the blockchain to store data and secure it at a higher level.The blockchain is implemented using the Hyperledger Fabric v1.0 and v2.0,to create a prototype for secure signature transfer.It exchanges signatures in a much more secured manner using the blockchain architecture when implemented with version 2.0 of Hyperl-edger Fabric.The performance of the proposed blockchain system is evaluated on UNSW NB15 dataset.Blockchain performance has been evaluated in terms of execution time,average latency,throughput and transaction processing time.Experimental evidence of the proposed IDS system demonstrates improved performance with accuracy,detection rate and false alarm rate(FAR)as key parameters used.Accuracy and detection rate increase by 2%and 3%respectively whereas FAR reduces by 1.7%.
基金supported by the BCUD University of Pune,India under Grant No.BCUD/OSD/184 as two year contract & Greaves Cotton Ltd (DEU) Pune
文摘A model of fuel injection adjustment for balancing the 4-stroke six cylinder diesel engine coupling geneset is developed by detecting imbalance in operating engine by the frequency analysis of the crankshaft＇s speed variation. In this work, the crankshaft is considered to be a rigid body, so that the variation of its angular speed could be directly correlated to the total gas-pressure torque. By analyzing only the lower harmonic orders, the speed variation spectrum can filter out the distortions produced by the dynamic response of the crankshaft. The information carried by these harmonic orders permits to establish correlations between measurements and the average gas pressure torque of the engine, and to detect imbalance and identify faulty cylinders. Detailed experimental reading are taken on diesel engine coupling genset on the test bed of Greaves Cotton Ltd Pane, India.
文摘The chassis frame is the backbone of a heavy commercial vehicle(HCV).Its main purpose is to securely carry the determined load under all designed operative situations.Thus,it should be rigid enough to withstand the various forces acting on it.The objective of this study was to develop a stiffness model to select an optimum cross section with determined torsional stiffness.Johnson’s method of optimization was adapted to develop a stiffness equation and select a section with a determined torsional stiffness and a requiredmass constraint.The stiffness obtained from the developed stiffnessmodel and finite element analysis(FEA)is a close match,which proves the validity of the proposed model.The section with the maximum torsional stiffness was used for frame-level optimization to improve the torsional and lateral stiffness of the overall chassis frame.The strain energy absorption capacity of the cross member improved by changing the section of the cross member.By using the optimized section,the torsional stiffness of the frame improved by 44%and a lateral stiffness of 10%was obtained.The Creo software was used for modeling and FEA was performed with the Hypermesh software.
