scholarly journals Analyzing and Eliminating Die Passivation Crack in a Power Leadframe Package using Submodeling Approach

2019 ◽  
pp. 1-6
Author(s):  
Jefferson Talledo
Keyword(s):  
Modeling And Simulation ◽  
Simulation Model ◽  
Stress Reduction ◽  
Temperature Cycling ◽  
Passivation Layer ◽  
Solution Time ◽  
Material Layer ◽  
Accuracy Of Results ◽  
The Right ◽  
Cycling Condition

This paper presents the submodeling approach in thermo-mechanical simulation of the die passivation crack encountered in a power leadframe package subjected to temperature cycling condition.  Without using modeling and simulation in resolving semiconductor package development issues, the process would be very costly and time-consuming. For die passivation crack, the details of the different layers of the die passivation need to be modeled and this would result in a large simulation model with considerable solution time. However, a technique known as submodeling can be used to reduce solution time without sacrificing accuracy of results. In this study, submodeling was successfully used to analyze the stresses in the critical passivation layer that resulted in the best design that eliminated the passivation crack. The modeling result showed that the crack could be eliminated by using the right passivation material layer combination and thickness. An increase in the thickness of the material layers and the additional of sublayers have provided significant stress reduction in the topmost critical passivation layer resulting in crack elimination.

Modeling and Simulation of an Improved Measure of MPPT in Photovoltaic System

2011 ◽  
Vol 88-89 ◽  
pp. 244-249 ◽  
Author(s):  
Shou Jiang Cai ◽  
Pei Liang Wang ◽  
Zhi Duan Cai ◽  
Jian Hua Mao
Keyword(s):  
Modeling And Simulation ◽  
Simulation System ◽  
Photovoltaic System ◽  
Storage Space ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Simulation Results ◽  
Power Point ◽  
Accuracy Of Results

Intermittent scan tracking (IST) is a maximum power point tracking (MPPT) method of photovoltaic system. The scanning approach of this method generally is order scanning. But this scanning mode has the weaknesses of the huge storage space and excessive amount of calculation. To eliminate these defects, this paper proposes a new scanning mode, i.e. nested scanning. To verify the effectiveness of the proposed method, a simulation system was modeled based on Matlab/Simulink. In the experiment two scanning modes above were compared and the simulation results proved that, on the premise that the accuracy of results is guaranteed, nested scanning mode can effectively decrease the quantity of required scanning voltages and currents, reduce the amount of calculation and improve the scanning efficiency.

The Research of Simulation of Transport Process

2011 ◽  
Vol 219-220 ◽  
pp. 80-83
Author(s):  
Wei Lu
Keyword(s):  
Modeling And Simulation ◽  
Simulation Model ◽  
Physical Process ◽  
Transport Process ◽  
Model Based

This paper researches on a simulation model based on the physical process, which is consisting in modeling and simulation.

The Modeling and Simulation of Pneumatic ABS Pressure Regulator Based on AMESim

2014 ◽  
Vol 971-973 ◽  
pp. 811-815 ◽  
Author(s):  
Tian Fei Ma ◽  
Qian Chen
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Modeling And Simulation ◽  
Simulation Model ◽  
Dynamic Characteristics ◽  
Commercial Vehicle ◽  
Static Characteristics ◽  
Pressure Regulator ◽  
Characteristic Curves ◽  
Good Agreement

The pneumatic ABS pressure regulator of commercial vehicle is submitted to study in this paper. Its structure and operating principle are introduced, and a simulation model based on the AMESim is established on the basis of its mathematical model. Then the static characteristics and dynamic characteristics are researched by simulation model and the characteristic curves are compared with experimental data for the verification. The results show that simulation curves and experiment curves are in good agreement, which can be tolerated in the engineering.

scholarly journals Simulasi Penentuan Optimasi Arah Taksi Kosong Dengan Gps Dan Metode Monte Carlo

2010 ◽  
Vol 22 (2) ◽  
pp. 214-228
Author(s):  
Sabungan Halomoan Hutapea ◽  
Rosita Sinaga
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simulation Model ◽  
Waiting Time ◽  
Arrival Time ◽  
Taxi Driver ◽  
Coordinate Position ◽  
Position Data ◽  
The Right ◽  
Monte Carlo Simulation Model

The development of metropolitan cihJ as Jakarta for years is high, thus the demand Jo transportationservices. Tcui is one of mode transportation which is mostly used by middle to high class people. Theproblem is, sometimes many people are wasting time for waiting empty taxi, mean while manyempty taxi, are searching for the passenger.The objective of this simulation model is to direct the taxi, movement to get passenger with the help ofi~b "based software. So then, there is information to direct the taxi, mavement to choose the right Wat}to get passenger with high possibilihJ rate of passenger.The taxi, driver is equipped by GPS that will find out the coordinate position data of geographical. Toinput the data such as position of start-finish and arrival time of passenger it can be done by cellμlarphone then data will be transmit to ~bsite.Using simulation approaching, a Monte Carlo simulation model can be build that will optimize taxi,driver to find passenger. This modeling will be able to estimate the possibilihj of passenger arrival anddistribution of taxi, cars in one area. The comparison of simulation without modeling resuled intincreament of some aspects, such as increment of delivetJ services increase to 81.48%, searching timeand waiting time become 4.12% and 6.45% respectively.Keyword: taxi, movement, waiting time, travel time, Monte-Carlo Simulation

scholarly journals An Improved Simulation Model for Pedestrian Crowd Evacuation

2020 ◽  
Author(s):  
Danial A. Muhammed ◽  
Tarik A. Rashid ◽  
Abeer Alsadoon ◽  
Nebojsa Bacanin ◽  
Polla Fattah ◽  
...  
Keyword(s):  
Simulation Model ◽  
New Method ◽  
Evacuation Time ◽  
Exit Door ◽  
Crowd Evacuation ◽  
New Feature ◽  
The Right ◽  
Pedestrian Crowd

<p>This paper works on one of the most recent pedestrian crowd evacuation models, i.e., “a simulation model for pedestrian crowd evacuation based on various AI techniques”, developed in late 2019. This study adds a new feature to the developed model by proposing a new method and integrating it with the model. This method enables the developed model to find a more appropriate evacuation area design, among others regarding safety due to selecting the best exit door location among many suggested locations. This method is completely dependent on the selected model's output, i.e., the evacuation time for each individual within the evacuation process. The new method finds an average of the evacuees’ evacuation times of each exit door location; then, based on the average evacuation time, it decides which exit door location would be the best exit door to be used for evacuation by the evacuees. To validate the method, various designs for the evacuation area with various written scenarios were used. The results showed that the model with this new method could predict a proper exit door location among many suggested locations. Lastly, from the results of this research using the integration of this newly proposed method, a new capability for the selected model in terms of safety allowed the right decision in selecting the finest design for the evacuation area among other designs.</p>

Fabrication and Reliability Assessment of Cu Pillar Micro-bumps with Printed Polymer Cores

2020 ◽  
Author(s):  
Xing QIU ◽  
Jeffery Lo ◽  
Yuanjie CHENG ◽  
Shi-Wei Ricky Lee ◽  
Yong Jhe TSENG ◽  
...  
Keyword(s):  
Flip Chip ◽  
Reliability Assessment ◽  
Temperature Cycling ◽  
Thermomechanical Stress ◽  
Joint Reliability ◽  
Cu Pillar ◽  
Bonding Technology ◽  
Temperature Cycling Test ◽  
Reliability Performance ◽  
Cycling Condition

Abstract Cu pillar micro-bumps with polymer cores have been demonstrated to effectively reduce thermomechanical stress and improve joint reliability. Fabricating polymer cores by a printing approach was proposed to overcome the limitations in conventional fabrication process. Cylindrical polymer cores with diameter of 20 µm and height of 30 µm were successfully printed. Surface metallization was subsequently applied on the printed polymer cores and Cu pillar micro-bumps with printed polymer cores with diameter of 35 µm and height of 35 µm were eventually achieved. To study the reliability performance of the interconnect joints made of Cu pillar micro-bumps with printed polymer cores, flip-chip bonding technology was successfully introduced and the interconnect joints between a designed BT substrate and a silicon chip were formed. The interconnect joints made of conventional Cu pillars with identical dimensions were prepared for comparison. The reliability performance of the joints was investigated under temperature cycling condition and drop condition, respectively. Printed polymer cores increased the characteristic life by 32% in a temperature cycling test (0°C-100°C), while the drop test showed that printed polymer cores increased the characteristic life by 4 times due to the extra compliance provided by the printed polymer cores. It can be concluded that Cu pillar micro-bumps with printed polymer cores can effectively reduce stress and improve joint reliability.

Research on Vibration Characteristic of Tamping Device Based on SIMULINK

2013 ◽  
Vol 694-697 ◽  
pp. 462-465
Author(s):  
Bin Hua ◽  
Yi Lin Chi ◽  
Xue Jun Wang ◽  
Yan Fang Ding
Keyword(s):  
Modeling And Simulation ◽  
Simulation Model ◽  
Vibration Characteristic ◽  
Analysis Method ◽  
Railway Line ◽  
Simulation Process ◽  
Simulation Efficiency ◽  
Modeling Process ◽  
Working Principle ◽  
Vibration Parameters

The requirements of higher speed, safety and more smooth and comfortable travelling are increasing strongly, this leads to the need of predictive maintenance of railway line, tamping machines have been used for this purpose. This paper presents the results of vibration characteristic of tamping device. Firstly, the basic working principle of tamping device was simply described; Then a simulation model of tamping device was established using SIMULINK in terms of mechanism principle; Finally, some vibration parameters were researched, such as velocity, acceleration, displacement of tamping device, which reflect the vibration characteristic of tamping device. In addition, the modeling process of simulation model was described, the function of SIMULINK was also simply recommended. The main aim of this paper is to propose an analysis method on facility vibration characteristic, which visualized reflects the kinematics characteristic of mechanism. The results show that the application of the technology can make the simulation process more visualization. The modeling process more simply, thus greatly improve modeling and simulation efficiency, and directly achieve our aims.

Far Back End of Line Aluminum Stress Reduction Methods for Two-Dimensional/2.5D Fine Pitch Assemblies

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Krishna Tunga ◽  
Thomas Wassick ◽  
Maryse Cournoyer
Keyword(s):  
Experimental Data ◽  
Stress Reduction ◽  
Passivation Layer ◽  
Primary Concern ◽  
Two Dimensional ◽  
Mechanical Modeling ◽  
Aluminum Stress ◽  
Safe Level ◽  
Fine Pitch ◽  
Design Changes

Fine pitch interconnects when used with two-dimensional (2D)/2.5D packaging technology offer enormous potential toward decreasing signal latency and by making it possible to package increased electrical functionality within a given area. However, fine pitch interconnects present their own set of challenges not seen in packages with coarse pitch interconnects. Increased level of stresses within the far back end of line (FBEOL) layers of the chip is the primary concern. Seven different types of 2D and 2.5D test vehicles with fine pitch and coarse pitch interconnects were built and tested for mechanical integrity by subjecting them to accelerated thermal cycling between −55 °C and 125 °C. Finite element based mechanical modeling was done to determine the stress level within the FBEOL layers of these test vehicles. For all the tested assemblies, experimental data and modeling results showed a strong correlation between reduced pitch and increased level of stresses and increased incidence of failures within the FBEOL region. These failures were observed exclusively at the passivation layer and aluminum pad interface. Experimental data in conjunction with mechanical modeling were used to determine a safe level of stress at the aluminum to passivation layer interface. Global and local design changes were explored to determine their effect on the stresses at this interface. Several guidelines have been provided to reduce these stresses for a 2D/2.5D package assembly with fine pitch interconnects. Finally, a reliable low stress configuration, which takes into account all the design changes, has been proposed, which is expected to be robust with very low risk of failure within the FBEOL region.

Modeling and Simulation of Propeller and Hull System for Marine Propulsion Plant

2011 ◽  
Vol 383-390 ◽  
pp. 2121-2125
Author(s):  
Ren Li ◽  
Wen Xiao Zhang ◽  
Hua Yan Li
Keyword(s):  
Modeling And Simulation ◽  
Simulation Model ◽  
Dynamic Properties ◽  
Operating Conditions ◽  
New Method ◽  
Matlab Simulink ◽  
System A ◽  
Marine Propulsion ◽  
Simulation Results ◽  
Mechanical Devices

Aiming at the complexity of mechanical devices and the polytrope of operating conditions for marine propulsion plant, the modeling and simulation of propeller and dull system are investigated based on MATLAB/Simulink. The simulation model of propeller and dull system is constructed in which the Chebyshev fit expression across four quadrants is given for the propeller. So it becomes practical to express static and dynamic properties of propeller and dull system. A luxury cruises fitted on two engines and two fixed pitch propellers is considered to perform simulation tests. The actual navigation conditions of marine propulsion plant, including starting, parking and reversing etc, are taken into account. The simulation results analysis illustrates the correctness and validity of modeling and simulation for propeller and dull system. Thus provides a new method for the optimization and design of marine propulsion plant.

Numerical Study on the Bearing Capacity of Composite Foundation with Pile-Soil Shear Modulus

2013 ◽  
Vol 405-408 ◽  
pp. 57-62
Author(s):  
Wei Zhou Li
Keyword(s):  
Numerical Simulation ◽  
Shear Modulus ◽  
Simulation Model ◽  
Bearing Capacity ◽  
Numerical Study ◽  
Composite Foundation ◽  
Capacity Increase ◽  
The Right

Numerical simulation model was established with FLAC3D to calculate the bearing capacity and the settlement of composite foundation with different pile-soil shear modulus. Then the rules of the effect of pile-soil shear modulus upon mixed pile composite foundation have been obtained. The results show that there is a great relationship between the pile-soil shear modulus and the bearing capacity of mixed pile composite foundation. Along with the increase of pile-soil shear modulus, the bearing capacity increase. Also, this paper suggest that the right value of pile-soil shear modulus of mixed pile composite foundation solidified by HEC or HAS consolidator dosing 12%, which can be used for the design of mixed pile composite foundation.

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