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Detection of solder bump defects on a flip chip using vibration analysis

Junchao LIU, Tielin SHI, Qi XIA, Guanglan LIAO

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1, Pages 29-37 doi: 10.1007/s11465-012-0314-7

Abstract: In this paper a nondestructive detection method combining ultrasonic excitation with vibration analysisWe use an integrated signal generator and power amplifier together with an air-coupled ultrasonic transducer

Keywords： flip chip defect detection ultrasonic excitation vibration analysis

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Approximation of structural damping and input excitation force

Mohammad SALAVATI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 244-254 doi: 10.1007/s11709-016-0371-9

Abstract: Structural dynamic characteristics are the most significant parameters that play a decisive role in structural damage assessment. The more sensitive parameter to the damage is the damping behavior of the structure. The complexity of structural damping mechanisms has made this parameter to be one of the ongoing research topics. Despite all the difficulties in the modeling of damping, there are some approaches like as linear and nonlinear models which are described as the energy dissipation throughout viscous, material or structural hysteretic and frictional damping mechanisms. In the presence of a mathematical model of the damping mechanisms, it is possible to estimate the damping ratio from the theoretical comparison of the damped and un-damped systems. On the other hand, solving the inverse problem of the input force estimation and its distribution to each SDOFs, from the measured structural responses plays an important role in structural identification process. In this paper model-based damping approximation method and a model-less structural input estimation are considered. The effectiveness of proposed methods has been carried out through analytical and numerical simulation of the lumped mass system and the results are compared with reference data. Consequently, high convergence of the comparison results illustrates the satisfactory of proposed approximation methods.

Keywords： structural modal parameters damping identification method input excitation force identification Inverse

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density measurement for plastic injection molding via ultrasonic technology

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0714-2

Abstract: This study is the first to propose an in-situ density measurement method using ultrasonic technologyThe ultrasonic velocity is obtained from the time-domain signals, and the acoustic impedance is computed

Keywords： ultrasonic measurement melt density in-situ measurement injection molding

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Linear ultrasonic motor using quadrate plate transducer

Jiamei JIN, Chunsheng ZHAO

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 88-91 doi: 10.1007/s11465-009-0016-y

Abstract: A linear ultrasonic motor using a quadrate plate transducer was developed for precision positioning.

Keywords： ultrasonic motor quadrate plate coincident frequency alternant contact

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Postprocessor development for ultrasonic cutting of honeycomb core curved surface with a straight blade

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0729-8

Abstract: minimization algorithm and spindle rotation algorithm were integrated and compiled, and the straight blade ultrasonicTherefore, the postprocessor developed in this paper can be well adapted to the honeycomb core ultrasonic

Keywords： honeycomb core straight blade ultrasonic cutting tool pose postprocessor

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Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0730-2

Abstract: Ultrasonic vibration-assisted grinding (UVAG) is an advanced hybrid process for the precision machiningIn this work, a novel perforated ultrasonic vibration platform resonator was developed for UVAG.element method, and the vibration tests show a high degree of consistency for developing the perforated ultrasonicThe employment of ultrasonic vibration reduces the grinding force by 36% at most, thereby decreasing

Keywords： ultrasonic vibration-assisted grinding perforated ultrasonic vibration platform vibration characteristics

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Design of ultrasonic elliptical vibration cutting system for tungsten heavy alloy

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0715-1

Abstract: In this study, a high-performance ultrasonic elliptical vibration cutting (UEVC) system is developedThe arrangement and working principle of piezoelectric transducers on the ultrasonic vibrator using theA cutting tool is installed at the end of the ultrasonic vibration unit to output the ultrasonic ellipticalA dual-channel ultrasonic power supply is developed to excite the ultrasonic vibration unit, which makes

Keywords： tungsten heavy alloy ultrasonic elliptical vibration cutting Timoshenko’s theory resonant mode of

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Improving the performances of ultrasonic motors using intermittent contact scheme

Jiamei JIN, Jianhui ZHANG, Fu QIAN, Zhenfeng PAN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2, Pages 242-246 doi: 10.1007/s11465-010-0016-y

Abstract: Most ultrasonic motors operate in intermittent contact scheme.A novel linear ultrasonic motor using the alternative work of the multi-driving end of a single stator

Keywords： ultrasonic motor intermittent contact alternative work

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Investigation on a cylindrical ultrasonic micromotor

ZHU Hua, CHEN Chao, ZHAO Chunsheng

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 394-398 doi: 10.1007/s11465-007-0068-9

Abstract: The relationship between the arrangement of ceramics and the force coefficient shows that the maximum excitationTherefore, a cylindrical ultrasonic micromotor with a novel stator is proposed.As this motor is suitable for miniaturization because of its simple structure, another cylindrical ultrasonic

Keywords： coefficient bending kHz suitable weight

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Machinability of ultrasonic vibration-assisted micro-grinding in biological bone using nanolubricant

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0717-z

Abstract: A new micro-grinding process called ultrasonic vibration-assisted nanoparticle jet mist cooling (U-NJMCIt combines the advantages of ultrasonic vibration (UV) and nanoparticle jet mist cooling (NJMC).

Keywords： micro-grinding biological bone ultrasonic vibration (UV) nanoparticle jet mist cooling (NJMC) grinding

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Effects of inclination angles of disc cutter on machining quality of Nomex honeycomb core in ultrasonic

Yidan WANG, Renke KANG, Yan QIN, Qian MENG, Zhigang DONG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2, Pages 285-297 doi: 10.1007/s11465-021-0631-9

Abstract: Ultrasonic cutting with a disc cutter is an advanced machining method for the high-quality processingThe machining quality is influenced by ultrasonic cutting parameters, as well as tool orientations, whichIn this work, the inclined ultrasonic cutting process with a disc cutter was analyzed, and cutting experimentsFurthermore, the tearing of the cell wall on the machined surface was observed, and the effects of the ultrasonicExperimental results revealed that ultrasonic vibration can effectively decrease the tearing of the cell

Keywords： Nomex honeycomb core disc cutter inclined ultrasonic cutting machining quality

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Simulation Research on PWM Control in Excitation System of Generator

Jia Guixi,Xu Wei,Guo Baoyue,Zhang Chentang

Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 50-53

Abstract:

A high quality excitation system not only plays an important role in the stability of power systemIn this paper, a PWM rectifier is applied to excitation system of synchronous generators.;s supply by achieving low harmonic current conversion and improving high power factor transform of excitation

Keywords： PWM high power factor excitation system Matlab simulation

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Performance investigation on ultrasonic levitation axial bearing for flywheel storage system

Taijiang PENG, Zhigang YANG, Junwu KAN, Fengjun TIAN, Xiaohong CHE,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 415-419 doi: 10.1007/s11465-009-0051-8

Abstract: Based on the performance research of ultrasonic levitation technology, a novel noncontact bearing calledultrasonic bearing is presented, which consists of a special piezoelectric vibrator supporting the loadThe ultrasonic bearing is highlighted because of its simple structure, strong levitation ability, and

Keywords： ultrasonic bearing flywheel storage system piezoelectric ceramic piezoelectric vibrator

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Analysis and control of micro-stepping characteristics of ultrasonic motor

Ning CHEN, Jieji ZHENG, Xianliang JIANG, Shixun FAN, Dapeng FAN

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4, Pages 585-599 doi: 10.1007/s11465-019-0577-3

Abstract: Micro-stepping motion of ultrasonic motors satisfies biomedical applications, such as cell operation

Keywords： ultrasonic motor stepping characteristics pulse number control synchronous acquisition system precise

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removal through the treatment of pharmaceutical wastewater using a combined internal electrolysis and ultrasonic

Liang SUN, Can WANG, Min JI, Fen WANG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3, Pages 481-487 doi: 10.1007/s11783-011-0341-3

Abstract: Actual pharmaceutical wastewater was treated using a combined ultrasonic irradiation (US) and iron/cokeA significant synergetic effect was observed, showing that ultrasonic irradiation dramatically enhancedHigher ultrasonic frequency and lower pH values as well as longer reaction time were favorable to COD

Keywords： internal electrolysis ultrasonic pharmaceutical wastewater biodegradability acute biotoxicity