Electrodynamic shaker environmental testing in india sdyn. Electrodynamic vibration system sev 180 low thrust. The sseries vibration test systems cover a wide range of force output 300 to 6,000 lbf 1. The armature is mechanically supported and positioned within the shaker housing by a flexure plate with low axial stiffness. Thermotrons electrodynamic vibration shaker sliptable design maximizes table. The higher the velocity limit, the greater the shakers capa.
Shaker style is back again as designers celebrate the first. The unit on the left has an essentially bare table. Electrodynamic shaker article about electrodynamic shaker. To attenuate the shaker suspension mode resonance a compensator based on electromechanical model of the shaker is designed and cascaded to fuzzy pi controller. Loudspeaker power ratings, which vary with the intended use of the loudspeaker, range from 0. Electrodynamic shaker electrodynamic vibration shaker. It essentially operates as a loudspeaker vibration is generated by a current flowing in a coil immersed in a magnetic field except that guides and suspensions have been added and that an external load will be mounted on the vibrating table. The control action is implemented on a single waveformbywaveform basis. Pdf the structural design of fixtures for vibration testing of structures on electro dynamic shakers correspond to a constrained optimization problem find. Vibration testing is the process of applying a controlled amount of vibration to a test specimen, usually for the purposes of establishing reliability or testing to destruction. The design methodology proposed in this paper is based on topological optimization tools. It can efficiently and safely test spacecraft with a mass of 10,000 kg in horizontal directions. An electrodynamic shaker is modeled as a mixed electricalmechanical system with an experimentally derived two port network characterization. The purpose of the present study is to improve the conventional electrodynamic shakers performance at low frequency through the optimization of its support spring.
Environmental test chambers and electrodynamic shaker test systems. Electrodynamic shaker fundamentals george fox lang, data physics corporation, san jose, california figure 1. The study of moving electric charges and their interaction with magnetic and electric fields. A second exhibition of shaker design also took place in toronto last month, while a number of designers have released products referencing. A methodology is presented to do accelerated vibration durability test, on electro dynamic shaker eds by using power spectral density psd profile based on typical customer usage pattern. Evaluation of a sixdof electrodynamic shaker system david o. Shaker table design for electronic device vibration test. This article, and the upcoming sequels, will take a fresh look at how to correctly select the right size electrodynamic shaker for each application. The purpose of the present study is to improve the performance of conventional high strength electrodynamic shaker.
The books basic organizing idea, the writing style and quality, the authors background, the. Methodology for accelerated vibration durability test on. Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light. Dynamic testing reference issue oct ober 2001 multi. For this purpose, an accelerometer is attached on the surface of the shaker table and sends the signal back to the controller. Dess vibration testing services can apply many types of vibration loads along 3 axes using our multiple electrodynamic shaker systems. Static stiffness, dynamic stiffness of the bearing small balloon, raising the vibration table capacity, improve lowfrequency performance. Virtual shaker modeling and simulation, parameters. A permanent magnet electrodynamic shaker for vibration testing of small assemblies and electronics, fatigue and resonance tests, and modal and structural analyses. Kenneth ames, winterthur museum, antiques beautifully illustrated.
What sets des apart from other labs is our indepth experience and technical capability to understand and reproduce the most complicated vibration profiles. All conventional ed shaker designs have used this basic design. Electrodynamic shaker systems for vibration testing mb. Ne albuquerque nm 87111 505 2962931 dan gregory sandia national laboratories albuquerque nm 87185 505 8449743 the paper describes the preliminary evaluation of a 6 degree of freedom electrodynamic shaker system. Adaptive acceleration control of an ac power sourcefed. Two small electrodynamic shakers illustrate the mass loading used in pluck tests. To extend the interface of the shaker in this configuration a singlehead expander with an internal bearing and an outside diameter of 1108 mm can be fitted to the shaker armature.
It will also examine system performance from a power perspective and present a simple means of estimating maximum system performance. Dynamic testing reference issue oct ober 2001 multiactuator. Within small loading bench to realize higher acceleration and. The overall design of standard electrodynamic shakers is not dissimilar to that of a loudspeaker 2,3. The electrodynamic loudspeakers are used in radio receivers, record players, and tape recorders.
Despite the numerous applications of electrodynamic shaker systems, details about their design and quantification of their performance benefits are extremely rare. A generalized iterative procedure is developed to optimize input excitation psd profile on eds for simulating. The ed series shakers are prepared to handle everything from small desktop vibration tests to. Griffiths, classical electrodynamics by john david jackson, electricity and.
The electrodynamic shaker is an electromechanical coupled structure. Tongue, benson, principles of vibration, oxford university press, 2001, isbn. The sseries shakers are supplied with sa, sai or ta series power amplifiers. The model characterizes the shaker in a manner that the performance of the shaker with a mounted load test item and fixture can be predicted. The innovative design of mb dynamics pmseries electrodynamic shakers incorporates permanent magnet technology and the voice coil principle to create vibration. Edge reports, scholarly journal articles, books, and paint chips may experience shipping delays of up to four to six weeks. Thermotrons electrodynamic shaker test system provides a testing platform for transportation simulation, mechanical shock, mission profile, environmental stress screening ess, and more. Optimum design of electrodynamic shaker s support spring to improve low frequency performance linzhen zhou1, jinglong han2 1school of mechanical engineering, yancheng institute of technology, yancheng 224051, china 1, 2state key laboratory of mechanics and control of mechanical structures. To study the performance of conventional high strength electrodynamic shaker, this study has carried out a baretable experiment on a v shaker of dual armature structure to measure its frequency response functions frf. The control action is implemented on a single waveformbywaveform. For rubber quality control and research, the eplexor 500n is said to be useful for dynamic component testing, durability tests, analysis of viscoelastic material. High frequency electrodynamic shaker horizontal stand features. The electrodynamic shaker systems are offered in a variety of force ranges, from 100n 25 lbf to 22kn 5,000 lbf. The design of fixtures to be used for vibration testing of structures on electro dynamic shaker is a delicate problem since bot h rigidity and lightne ss of the fixture are searched.
Highlights an intelligent fuzzy logic based digital time domain sinusoidal acceleration waveform amplitude controller for an electrodynamic shaker is investigated. Evaluation of a sixdof electrodynamic shaker system. The higher the velocity limit, the greater the shaker s capa. Characterizing electrodynamic shakers unt digital library. The ed series shakers are prepared to handle everything from small desktop vibration tests to serious production work. Modal shaker faq rev a 1 frequently asked questions modal shakers and related topics modal shaker related questions 1. A next generation electrodynamic shaker for the primary calibration of acceelerometers u. The s452 series provides an intermediate force range of vibration test systems consisting of the sasai series class d power amplifier, s452 electrodynamic shaker, integrated dc field supply, remote cooling blower and isolated base configurations to provide vibration isolation to building surroundings. A wide variety of electrodynamic shaker price options are available to you, such as auto testing machine, universal testing machine.
Reviewing this topic should help those using shakers refresh their understanding of. At the heart of the shaker is a coil of wire, suspended in a fixed ra. The presented scheme is based on the interaction of two control loops. Modern vehicles are driven with various speeds over specific rough road tracks to detect the presence of annoying buzz, squeak and rattle sounds. The performance envelope of an electrodynamic shaker system is strongly influenced by three modes of vibration and the voltagecurrent capacities of the power amplifier that drives.
As known in the occupant safety industry the mechanical locking systems of seat belt retractors can be significant noise sources, when excited by road vib. The structure of an electrodynamic shaker bears some resemblance to a common loudspeaker but is more robust. What frequency does it become important to use the inertial masses. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as li. The characterization depends on the measurements of shaker input voltage and current, and on the acceleration.
Manufacturer of electrodynamic vibration system sev 180 low thrust series, power amplifiers, horizontal slip table and sev 140 shaker offered by saraswati. These heavyduty electrodynamic shakers feature a robust design for. Meanwhile it should have few resonance points in the. Shaker style is back again as designers celebrate the. The design qualification level requirement for this specification is presented in figure 2. With dynamic and enhanced performance in displacement, velocity, acceleration, and force, electrodynamic shakers accurately simulate a wide range of conditions that can help improve product and test quality and reliability. As known in the occupant safety industry the mechanical locking systems of seat belt retractors can be significant noise sources, when excited by. The sev series is air cooled and sew series is water cooled, respectively. Standard and customdesigned environmental chambers providing our customers with solutions to meet their most demanding environmental testing requirements. Electrodynamic shaker systems for vibration testing mb dynamics. Electrodynamic shaker article about electrodynamic.
The product portfolio covers all ranges of shaker, from 10 kgf up to 32000 kgf and beyond. Electrodynamic loudspeaker a loudspeaker in which the interaction between the magnetic field of a. Vibration controller sdyns vibration controllers are tailored in 4816 channel configuration to bring users the most advanced and complete range of vibration testing solutions. Not only is the book a beautifully presented record of the world the shakers created, it is also the most thorough, balanced, and unbiased survey of shaker material culture. This is a close shaker table design for electronic device vibration test system. Optimum design of new high strength electrodynamic shaker. Twomagnetic circuit, magnetic flux leakage low, compact structure and rational. Housed inside the shakers body, the field coils are always stationary and produce a constant flux which magnetises the iron, creating the two poles in front and back of the armature coil. Velocity is the speed at which the armature can move. Multishaker this facility is built of two 160 kilonewton shakers coupled to a large slip table. Optimum design of new high strength electrodynamic shaker in.
Sdyns sev and sew series of electrodynamic shaker produces vibration based on the principle of magnetism. Fundamentals of electrodynamic vibration testing handbook. Fuzzy control of an electrodynamic shaker for automotive. A wide variety of electrodynamic shaker options are available to you, such as vibration testing machine, universal testing machine, and auto testing machine. These chambers range from small benchtop chambers to full walkin chambers and. Fuzzy control of an electrodynamic shaker for automotive and. This hand book provides guidance for setting up and conducting shock tests in conformance. Our vibration controllers are compatible with any make of amplifier and shaker combination available worldwide. The purpose of the present study is to improve the conventional electrodynamic shakers performance at low frequency through the optimization of its support.
Posted on september 30, 2015 by adminblog leave a reply. Electrodynamic shaker vibration test system, eectrodynamic. Dynamic testing reference issue oct ober 2001 multiactuator vibration control shaker performance dynamic testing equipment. It provides good coverage of vibration exciters, shaker amplifiers. Electrodynamic definition of electrodynamic by the free. Vibration controller electrodynamic vibration system sdyn. Cseries hp electro dynamic shaker systems historically large installed base the mb dynamics c10e, c40hp, c90hp and c150hp electrodynamic shakers comprise current deliverables in a long history of reliable and rugged shakers earning a welldeserved reputation. Methodology for accelerated vibration durability test on electrodynamic shaker. Electrodynamic shaker josts engineering company limited. Our equipments been widely applied for industries like electronic.
Welcome dynamic testing customers here youll find information to help you test, model and modify the dynamic behaviors of products and processes. Mar 01, 2017 a second exhibition of shaker design also took place in toronto last month, while a number of designers have released products referencing the groups work this revival of interest in the. Twocoil design reduces rotational turning moments and ensures superior performance vibration control at lowfrequencies with peak force ratings from 8. Shock spectrum of scout design qualification vibration. Mechanical retractor noise evaluation on electrodynamic. In practice the test article is securely mounted on a shaker table or actuator, which may be operated by electrodynamic or hydraulic force. Optimum design of electrodynamic shakers support spring. Design, fabrication and vibration analysis of a lightweight head. A new shaker system was designed to allow direct primary calibration of accelerometers using both reciprocity and interferometer techniques over the frequency range 40 hz to 10. With conventional vibration testing using a shaker with a traditional mounting platform design, the test.
Welldesigned dynamic circle skeleton, with a higher stage axial resonance frequency. A shaker is a device used in vibration testing to excite the structure either for endurance testing or modal testing. The s452 series provides an intermediate force range of vibration test systems consisting of the sasai series class d power amplifier, s452 electrodynamic shaker, integrated dc field supply, remote cooling blower and isolated base configurations. We are manufacturer of electrical vibration series products, adopted the doublemagnetic circuit structure,selfgenerated skeleton action circles, airborne support and roller bearings and linear guidance,trunnion isolation advanced modern technology and special. The characterization depends on the measurements of shaker input voltage and current, and on the.
Spectral formulated modelling of an electrodynamic shaker. Their primary feature is an armature assembly driven by a coil of wire subject to a radial magnetic field. If it takes too long to load the home page, tap on the button below. It is acknowledged that to improve its low frequency performance, a shakers support spring has to be lightweight and simultaneously of high lateral but low axial rigidity. High frequency electrodynamic shaker, vibration shaker for. Our patented low profile shaker design integrates the load support stabilizing hardware with permanent magnet electrodynamic shaker technology to provide unmatched cost savings and ease of use. Velocity limits for electrodynamic shakers can reach 100 inches per second 2. The magnetic circuit design of sdyns electrodynamic shaker uses two field coils. The structural design of fixtures for vibration testing of structures on electrodynamic shakers correspond to a constrained optimization problem.
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