With this curve i have calculated the rms values of acelerations, velocity and displacement with some formulas that i found in the book of thorby. Is provided with control system according to capability reproduction of rated displacement, velocity and acceleration diapasons. Electrodynamic vibration shakers and exciters the modal shop. For this purpose, an accelerometer is attached on the surface of the shaker table and sends the signal back to the controller. Electrodynamic shaker systems vibration equipment unholtz. A shaker is a device used in vibration testing to excite the structure either for endurance testing or modal testing. The higher the velocity limit, the greater the shakers capa. Shock spectrum of scout design qualification vibration.
The sev series is air cooled and sew series is water cooled, respectively. Electrodynamic shaker systems for vibration testing mb dynamics. The sseries shakers are supplied with sa, sai or ta series power amplifiers. 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. When specifying a new electrodynamic shaker, it is common for a highforce shock specification to require a larger, more powerful vibration system than required by the random and sine specifications, significantly driving up the price point.
The study of moving electric charges and their interaction with magnetic and electric fields. Dc07design and construct of an electrodynamic vibration. 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. Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. It will also examine system performance from a power perspective and present a simple means of estimating maximum system performance. Introduction electrodynamic shaker is an electricaldynamic converter, that is, to convert electric energy into mechanical force to provide the exciting force to the test article. Evaluation of a sixdof electrodynamic shaker system david o. Griffiths, classical electrodynamics by john david jackson, electricity and. Despite the numerous applications of electrodynamic shaker systems, details about their design and quantification of their performance benefits are extremely rare. The vibration controller generates the signal that is feed to a power amplifier much like an mp3 player of an audio system. But both experimental modal analyses and finite element analyses carried out in this study indicate the structure leads to undesirable hump in its work frequency range. When to do a halthass test vs electrodynamic ed shaker test by dr.
Electrodynamic vibration system electrodynamics shaker sdyn. The innovative design of mb dynamics pmseries electrodynamic shakers incorporates permanent magnet technology and the voice coil principle to create vibration. Shaker table design for electronic device vibration test system. Optimum design of new high strength electrodynamic shaker in. The higher the velocity limit, the greater the shaker s capa.
High frequency electrodynamic shaker, vibration shaker for. These electrodynamic exciters are small, portable permanent magnet shakers. Vibration tests are essential for evaluating products safety and reliability. Pdf the structural design of fixtures for vibration testing of structures on electrodynamic shakers correspond to a constrained optimization problem find. This hand book provides guidance for setting up and conducting shock tests in conformance. This is a close shaker table design for electronic device vibration test system. What sets des apart from other labs is our indepth experience and technical capability to understand and reproduce the most complicated vibration profiles. The books basic organizing idea, the writing style and quality, the authors background, the. The structure of an electrodynamic shaker bears some resemblance to a common loudspeaker but is more robust.
Velocity is the speed at which the armature can move. At the heart of the shaker is a coil of wire, suspended in a fixed ra. Spectral formulated modelling of an electrodynamic shaker. The ed series shakers are prepared to handle everything from small desktop vibration tests to serious production work. Electrodynamic shaker is a standard tool to perform dynamic tests in structure and can be. A next generation electrodynamic shaker for the primary calibration of acceelerometers u. Sdyns sev and sew series of electrodynamic shaker produces vibration based on the principle of magnetism. Two small electrodynamic shakers illustrate the mass loading used in pluck tests. In an electrodynamic vibration system the electrodynamic shaker works like the speakers of an audio system.
Twomagnetic circuit, magnetic flux leakage low, compact structure and rational. An electrodynamic vibration system and an audio system are somewhat similar in the basic principle. 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. The electrodynamic loudspeakers are used in radio receivers, record players, and tape recorders. Dess vibration testing services can apply many types of vibration loads along 3 axes using our multiple electrodynamic shaker systems. As a leading manufacturer of electrodynamic shaker systems, unholtz dickie offers more than 85 shaker system configurations to cover any test application.
Electrodynamic vibration test systems imv corporation. Understanding the physics of electrodynamic shaker. 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. Electrodynamic shaker article about electrodynamic shaker. The electrodynamic shaker systems are offered in a variety of force ranges, from 100n 25 lbf to 22kn 5,000 lbf. The overall design of standard electrodynamic shakers is not. Welldesigned dynamic circle skeleton, with a higher stage axial resonance frequency.
Generating uniaxial vibration with an electrodynamic shaker and. The magnetic circuit design of sdyns electrodynamic shaker uses two field coils. All conventional ed shaker designs have used this basic design. Its fundamental working principle is to input current to the coil in a magnetic field so that the charged coil can receive the electromagnetism induction force. The sseries vibration test systems cover a wide range of force output 300 to 6,000 lbf 1.
Electrodynamic shaker environmental testing in india sdyn. We have developed a line of vibration test shakers, amplifiers, controllers, and accessories designed. Welcome dynamic testing customers here youll find information to help you test, model and modify the dynamic behaviors of products and processes. Pdf the structural design of fixtures for vibration testing of structures on electro dynamic shakers correspond to a constrained optimization problem find. The design of the specimen is essential in fatigue tests to address the. Crossdevelopment of a novel vibrationbased fatigue testing methodology. A permanent magnet electrodynamic shaker for vibration testing of small assemblies and electronics, fatigue and resonance tests, and modal and structural analyses. Electrodynamic shaker electrodynamic vibration shaker. During this time the electrodynamic vibrator has become an increasingly useful tool in simulating this environment. With dual armature structure, the shaker can produce strong output force. Recommended vibration literature excitation the modal shop, inc.
Woodworking crafts the shaker movement in america began in 1774 when mother ann lee emigrated from manchester. Electrodynamic definition of electrodynamic by the free. Electrodynamic shaker fundamentals george fox lang, data physics corporation, san jose, california figure 1. These heavyduty electrodynamic shakers feature a robust design for.
Vibration testing has actually gotten more confusing today than people realize. Thermotron has a cost effective, alternative solution. Our equipments been widely applied for industries like electronic. The unit on the left has an essentially bare table. Capabilities of electrodynamic shakers when used for mechanical shock testing introduction in recent years, much attention has been focused on the mechanical shock environment for aerospace hardware. It provides good coverage of vibration exciters, shaker amplifiers. The purpose of the present study is to improve the performance of conventional high strength electrodynamic shaker. Random vibration designing an electrodynamic shaker cr4. Optimum design of new high strength electrodynamic shaker. A wide variety of electrodynamic shaker options are available to you, such as vibration testing machine, universal testing machine, and auto testing machine. Dynamic testing reference issue oct ober 2001 multiactuator. Modern armature designs typically use ep oxy bonding techniques to affix a rigid epoxystabilized coil to a light magnesium table structure. Generating uniaxial vibration with an electrodynamic shaker. Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.
Design properties control accelerometer usually attached on shaker table, test fixture, or test specimen typically placed on shaker table at lincoln laboratory properties to consider when attaching accelerometers c. As a vibration technology specialist, imv meets the needs of our clients. Velocity limits for electrodynamic shakers can reach 100 inches per second 2. Hello friends, im designing an electrodynamic shaker to perform a random vibration test and i want an idea about how much energy i need. Electrodynamic loudspeaker article about electrodynamic. A spellbinding book, depicting the remarkable work of some remarkable men and women. Evaluation of a sixdof electrodynamic shaker system. Loudspeaker power ratings, which vary with the intended use of the loudspeaker, range from 0. The product portfolio covers all ranges of shaker, from 10 kgf up to 32000 kgf and beyond.
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