Mechanical Shock FE Modeling for ATCA Circuit Board Design

2005 ◽  
Author(s):  
Frank Z. Liang ◽  
Larry M. Palanuk ◽  
Wade Hezeltine
Keyword(s):  
High Speed ◽  
Natural Frequencies ◽  
Mechanical Design ◽  
Element Model ◽  
Circuit Board ◽  
Mechanical Shock ◽  
Risk Areas ◽  
Processor Unit ◽  
Communication Equipment ◽  
Modal Method

ATCA is a new form factor for communication equipment applications. Finite element model (FEM) was created to predict the dynamic response of an ATCA design during a table drop shock. The model was built with 2nd order brick elements for minimizing the meshing sensitivity. Modal method was used and followed by dynamic transient analysis with superposition approach and validated by comparing the modal test data for matching the natural frequencies and the modal shapes. The model was further validated by comparing the board displacement with direct displacement measurement using a high speed camera. As a result the localized board strain predictions matched the measured board strain at each networking processor unit. The validated model was used to predict the risk areas for solder joints, which later proved to be accurate during board design verification tests. This paper presents the modeling and model validation processes, as well as the ATCA mechanical design evaluations.

scholarly journals OPTIMIZATION OF SOME WEAVING MACHINE PARTS DESIGN. THEORETICAL APPROACH

2021 ◽  
Vol 2021 ◽  
pp. 215-221
Author(s):  
A. Mostafa ◽  
W. Hashima ◽  
S. El-Gholmy ◽  
A. Al-Oufy ◽  
M. Hassan
Keyword(s):  
High Speed ◽  
Natural Frequencies ◽  
Operating Time ◽  
Research Work ◽  
Element Model ◽  
Vibration Modes ◽  
Work Study ◽  
Mechanical Factors ◽  
Machine Parts ◽  
The Cost

The factors of increasing productivity, reducing the cost and the quality improvement are the most important research concerns in weaving machinery. Increasing the effectiveness and productivity of production were achieved by increasing the operating time and efficiency of weaving looms. Thus, the manufacturers of weaving equipment attempt to minimize factors that limit production speed and production conditions. Heald frame is one of the known parts of the weaving machine that causes vibrations and noise which are important factors that influence high-speed development of looms. In this research work, study of mechanical factors (stresses and vibration) has been investigated for heald shaft. Finite element model of the heald frame was constructed to simulate different type of material. Then some important natural frequencies and vibration modes are calculated and the results. Results show a major improvement with the usage of these different material. As well as the failure of heald shaft is mainly due to friction and vibration and not due to the stresses or weight.

Dynamic Analysis of HSDB System and Evaluation of Boundary Non-linearity through Experiments

2016 ◽  
Vol 66 (3) ◽  
pp. 210
Author(s):  
K. Chandrakar ◽  
P.L. Venkateshwara Rao ◽  
P. Rajendran ◽  
C. Satyanarayana
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
High Speed ◽  
Printed Circuit Board ◽  
Structural Integrity ◽  
Mechanical Design ◽  
Circuit Board ◽  
Element Analysis ◽  
Maximum Acceleration ◽  
Vibration Tests

<p class="FAIMTextBody">This paper deals with mechanical design and development of high speed digital board (HSDB) system which consists of printed circuit board (PCB) with all electronic components packaged inside the cavity for military application. The military environment poses a variety of extreme dynamic loading conditions, namely, quasi static, vibration, shock and acoustic loads that can seriously degrade or even cause failure of electronics. The vibrational requirement for the HSDB system is that the natural frequency should be more than 200 Hz and sustain power spectrum density of 14.8 Grms in the overall spectrum. Structural integrity of HSDB is studied in detail using finite element analysis (FEA) tool against the dynamic loads and configured the system. Experimental vibration tests are conducted on HSDB with the help of vibration shaker and validated the FE results. The natural frequency and maximum acceleration response computed from vibration tests for the configured design were found. The finite element results show a good correlation with the experiment results for the same boundary conditions. In case of fitment scenario of HSDB system, it is observed that the influence of boundary non-linearity during experiments. This influence of boundary non-linearity is evaluated to obtain the closeout of random vibration simulation results.</p>

scholarly journals Development of Control Circuit for Inductive Levitation Micro-Actuators

Proceedings ◽  
2020 ◽  
Vol 64 (1) ◽  
pp. 39
Author(s):  
Vitor Vlnieska ◽  
Achim Voigt ◽  
Sagar Wadhwa ◽  
Jan Korvink ◽  
Manfred Kohl ◽  
...  
Keyword(s):  
High Speed ◽  
Printed Circuit Board ◽  
Element Model ◽  
Control Circuit ◽  
Circuit Board ◽  
Flip Flop ◽  
Micro Actuator ◽  
Actuation System ◽  
Micro Actuators ◽  
A Current

A control circuit for inductive levitation micro-actuators was developed in this research, the circuit’s performance and its electrical parameters are discussed. The developed control circuit was fabricated on a four-layer printed circuit board (PCB) board with a size of 60 × 60 × 25 mm. It consisted of a generator based on high-speed Flip-Flop components and a current amplifier build on a H-bridge configuration. The circuit was able to generate an AC current with a squared waveform in a frequency range from 8 to 43 MHz and with a peak-to-peak amplitude of up to 420 mA. To demonstrate the efficiency of developed circuit and its compatibility with a micro-actuation system, an inductive levitation micro-actuator was fabricated by using 3D micro-coil technology. The device was composed of two solenoidal coil designs, a levitation and a stabilization coil, with outer diameters of 2 and 3.8 mm, respectively. A 25 μm diameter gold wire was used to fabricate the coils, with the levitation coil having 20 turns and the stabilization coil having 12 turns, similar to the micro-structure presented previously by our group. Using the developed control circuit, the micro-actuator was successfully excited and it demonstrated the actuation of aluminum disc-shaped micro-objects with diameters of 2.8 and 3.2 mm and, for the first time, an aluminum square-shaped object with a side length of 2.8 mm at a frequency of 10 MHz. To characterize the actuation, the levitation height and the current amplitude were measured. In particular, we demonstrated that the square-shaped micro-object could be lifted up to a height of 84 μm with a current of 160 mA. The characterization was supported by a simulation using a 3D model based on the quasi-finite element model (FEM) approach.

Fault Diagnosis of Wind Turbine Gearboxes

2012 ◽  
Vol 512-515 ◽  
pp. 715-718
Author(s):  
Yu Bai Zhang ◽  
Hui Qun Yuan ◽  
Yin Xin Yu ◽  
Hai Jiang Kou ◽  
Ming Xuan Liang
Keyword(s):  
Wind Turbine ◽  
High Speed ◽  
Fault Location ◽  
Natural Frequencies ◽  
Experimental Tests ◽  
Element Model ◽  
Frequency Domain Analysis ◽  
Mode Shapes ◽  
Frequency Components ◽  
The Finite Element Model

Abnormal vibration appeared when experimental tests was carried out on gearboxes of a 1.5MW wind turbine. In this paper, Time-domain and frequency- domain analysis of test data was implemented based on the method of wavelet denoising, the fault location was determined, and the vibration fault indicators and frequency components were obtained. The finite element model of the gearboxes were established, and the natural frequencies and mode shapes were achieved by calculating. The results showed that the fault occurred in the high speed shaft parts, fault vibration frequency was caused by high-speed shaft eccentric resonance frequency and the frequency generated by the natural frequency and the edge frequency that caused by turning. The research layed the foundation for the study of noise reduction and optimization of the wind turbine gearboxes.

Stress and Vibration Analysis of a Lathe Bed Made of Aluminum-Copper Alloy for High Speed Machining

2009 ◽  
Vol 15 ◽  
pp. 81-88 ◽  
Author(s):  
R. Torres-Martínez ◽  
G. Urriolagoitia-Calderón ◽  
G. Urriolagoitia-Sosa ◽  
R. Espinoza-Bustos
Keyword(s):  
Cast Iron ◽  
High Speed ◽  
Natural Frequencies ◽  
Mechanical Design ◽  
Parametric Modeling ◽  
High Speed Machining ◽  
The Finite Element Method ◽  
Cu Alloy ◽  
Design Variables ◽  
Machine Tool Structure

The analysis of the rigidity of an Al-Cu alloy lathe bed to be used for high speed machining (HSM) is presented in this work. Mechanical design optimization by means of simulations based on the finite element method (FEM) was applied in order to calculate the lathe bed deflections, the natural frequencies and the corresponding vibration amplitudes. For the parametric modeling, a prototype lathe to be used in conventional speed machining (CSM) with a cast iron bed was considered. The optimized parameter was the stress in the lathe bed, considering as a restriction the allowable deflection in a node of the machine-tool structure. The design variables were the height, the thickness, and the length of the wall of the lathe bed. The lathe bed was loaded with cutting and inertial forces due to HSM in order to demonstrate that the evaluated stresses and vibration amplitudes are in an acceptable level according to ISO Standards (system of limits and fits in workpieces). The results show the feasibility of using an Al-Cu alloy instead of cast iron in the fabrication of lathe beds. This increases the flexibility of manufacture.

Dynamic Modeling and Analysis of a High Speed Precision Drilling Machine

1990 ◽  
Vol 112 (3) ◽  
pp. 355-365 ◽  
Author(s):  
Yih-Hwang Lin ◽  
M. W. Trethewey ◽  
H. M. Reed ◽  
J. D. Shawley ◽  
S. J. Sager
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Behavior ◽  
High Speed ◽  
Position Control ◽  
Element Model ◽  
Dynamic Responses ◽  
Circuit Board ◽  
Drilling Machine ◽  
Air Bearing

This paper describes the modeling and dynamic analysis of a high speed precision circuit board drilling machine. The drilling machine has two banks of movable drill spindles supported between parallel granite beams on an air bearing suspension. Each drill spindle is programmed to move laterally between the beams under the position control of a servo-feedback system. The drill spindles must complete a nominal 3.048 mm (0.12 in.) lateral move and a vertical drilling sequence every 200 ms. while maintaining an absolute positioning accuracy within 0.01778 mm (0.0007 in.). In order to meet these demanding specifications the dynamic behavior of the complete drill spindle/air bearing/granite beam system must be well understood. A specialized finite element model (FEM) is used to examine the dynamic responses of the critical components of this machine. The FEM code is capable of analyzing a sprung two degrees of freedom system moving on an elastic beam in an arbitrary fashion. The discussion concentrates on the engineering modeling considerations and compromises which were necessary to analyze the drilling machine with this computer code. The modeling rationale and use of experimental data to form an effective computer model capable of analyzing the dynamic behavior of the drilling machine are emphasized. Typical results from the finite element model are presented to illustrate the obtainable level of accuracy, detail and the limitations for modeling a system of this nature.

The Blade Strength and the Dynamic Characteristics of High Speed Micro-Turbines

2006 ◽  
Author(s):  
Jao Hwa Kuang ◽  
Hsuan-Sheng Chen ◽  
Tsung-Pin Hung
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
High Speed ◽  
Natural Frequencies ◽  
Operating Temperature ◽  
Element Model ◽  
Ti Alloy ◽  
Rotating Speed ◽  
Mechanical Creep ◽  
Micro Turbine

The effects of centrifugal force and operating temperature on the stress and creep deformation of rotating micro-turbo rotors are studied in this work. The thermal-mechanical- creep coupled finite element model provided in the MARC package is employed. The variation of stresses and creep strain distributions in turbo blades made of different materials, e.g. stainless steel (A304L), Ti-alloy (Ti-2411) and two ceramics (SiC and SiN3) are analyzed and compared. The effect of rotating speed on the natural frequencies of the micro-turbine with different turbo-blade materials are also evaluated and compared in this study. Numerical results indicate that the strength and dynamic behavior of the micro-turbo rotor is very sensitive to the material of turbo blade.

Modeling the Effects of the PCB Motion on the Response of Microstructures Under Mechanical Shock

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Abdallah H. Ramini ◽  
Mohammad I. Younis ◽  
Ronald Miles
Keyword(s):  
Printed Circuit Board ◽  
Microelectromechanical Systems ◽  
Element Model ◽  
Higher Order ◽  
Circuit Board ◽  
Mechanical Shock ◽  
Lumped Model ◽  
Distributed Models ◽  
Mems Device ◽  
Cantilever Microbeam

Microelectromechanical systems (MEMS) are often used in portable electronic devices that are vulnerable to mechanical shock or impact, such as that induced due to accidental drops on the ground. This work presents a modeling and simulation effort to investigate the effect of the vibration of a printed circuit board (PCB) on the dynamics of MEMS microstructures when subjected to shock. Two models are investigated. In the first model, the PCB is modeled as an Euler-Bernoulli beam to which a lumped model of a MEMS device is attached. In the second model, a special case of a cantilever microbeam is studied and modeled as a distributed-parameter system, which is attached to the PCB. These lumped-distributed and distributed-distributed models are discretized into ordinary differential equations, using the Galerkin method, which are then integrated numerically over time to simulate the dynamic response. Results of the two models are compared against each other for the case of a cantilever microbeam and also compared to the predictions of a finite-element model using the software ANSYS. The influence of the higher order vibration modes of the PCB, the location of the MEMS device on the PCB, the electrostatic forces, damping, and shock pulse duration are presented. It is found that neglecting the effects of the higher order modes of the PCB and the location of the MEMS device can cause incorrect predictions of the response of the microstructure and may lead to failure of the device. It is noted also that, for some PCB designs, the response of the microstructure can be amplified significantly causing early dynamic pull-in and hence possibly failure of the device.

Dynamic model for high-speed rotors based on their experimental characterization

2017 ◽  
Vol 2 (4) ◽  
pp. 25
Author(s):  
L. A. Montoya ◽  
E. E. Rodríguez ◽  
H. J. Zúñiga ◽  
I. Mejía
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Experimental Characterization ◽  
Rotating Systems ◽  
Computing Performance ◽  
The Impact ◽  
Stiffness Distribution ◽  
Good Agreement

Rotating systems components such as rotors, have dynamic characteristics that are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a centrifugal compressor shaft. The peculiarity of the dynamic model proposed is that using frequency and displacements values obtained experimentally, it is possible to calculate the mass and stiffness distribution of the shaft, and then use these values to estimate the theoretical modal parameters. The natural frequencies and mode shapes of the shaft were obtained with experimental modal analysis by using the impact test. The results predicted by the model are in good agreement with the experimental test. The model is also flexible with other geometries and has a great time and computing performance, which can be evaluated with respect to other commercial software in the future.

scholarly journals Spatially Resolved Experimental Modal Analysis on High-Speed Composite Rotors Using a Non-Contact, Non-Rotating Sensor

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4705
Author(s):  
Julian Lich ◽  
Tino Wollmann ◽  
Angelos Filippatos ◽  
Maik Gude ◽  
Juergen Czarske ◽  
...  
Keyword(s):  
High Speed ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Fiber Reinforced ◽  
Structural Dynamic ◽  
Spatially Resolved ◽  
Glass Fiber Reinforced ◽  
Vibration Responses ◽  
And Performance

Due to their lightweight properties, fiber-reinforced composites are well suited for large and fast rotating structures, such as fan blades in turbomachines. To investigate rotor safety and performance, in situ measurements of the structural dynamic behaviour must be performed during rotating conditions. An approach to measuring spatially resolved vibration responses of a rotating structure with a non-contact, non-rotating sensor is investigated here. The resulting spectra can be assigned to specific locations on the structure and have similar properties to the spectra measured with co-rotating sensors, such as strain gauges. The sampling frequency is increased by performing consecutive measurements with a constant excitation function and varying time delays. The method allows for a paradigm shift to unambiguous identification of natural frequencies and mode shapes with arbitrary rotor shapes and excitation functions without the need for co-rotating sensors. Deflection measurements on a glass fiber-reinforced polymer disk were performed with a diffraction grating-based sensor system at 40 measurement points with an uncertainty below 15 μrad and a commercial triangulation sensor at 200 measurement points at surface speeds up to 300 m/s. A rotation-induced increase of two natural frequencies was measured, and their mode shapes were derived at the corresponding rotational speeds. A strain gauge was used for validation.

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