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多振动台振动测试

Multishaker Vibration Testing

Multishaker testing has been growing inpopularity over the past several years. This testing is done not only in theautomotive industry, but across the board in the Aerospace, Defense, and evenElectronics industries. Along with the increased use, more standards are beingwritten around multishaker testing. The most notable standard to now includemultishaker testing is the MIL-STD 810G, Method 527.

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NASA Plum Brook MDOF Shaker Installation

There are three primary reasons to domultishaker testing: (1) better real-world reproduction of vibration, (2) largeor massive test articles, and (3) reductions in test time.

A more accurate simulation of the vibrationseen in actual use enables engineers to better produce failures that they willsee in the field, and consequently have confidence in the survivability ofproducts and equipment.

Extremely large test articles often poseproblems for single shaker testing. The payload may require complicated or nearimpossible fixtures to be tested with a single shaker. Very heavy test objectsmay even require more force than a single shaker can provide.

An additional benefit that is increasinglybeing realized is the reduction in test time that one sees from doing more thanone linear axis of motion at a time. Traditional development, qualification,and screening vibration testing has always been single axis testing. Being ableto better reproduce failures along with reducing test time makes simultaneousthree degree of freedom an attractive alternative.

The current state of multishaker vibrationcontrol has now made it not only possible, but beneficial, to use two shakersinstead of a single large shaker when testing large payloads. In additional tothe higher achievable force, a dual shaker provides less concern about issuessuch as payload placement and upper end frequency performance. The flexibilityprovided by this arrangement also makes it possible to use the two shakersindependently for component level testing at even higher frequencies.

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3 DOF Shaker Arrangement

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Dual Shaker SDOF Arrangement

Typical applications for multi shakertesting include earthquake testing and simulation, weapons system vibrationqualification, seat vibration (both with and without a person in the seat),spacecraft and satellite qualification, automotive durability testing,automotive component testing, squeak and rattle testing, and general purposeelectronics testing.

The case of the electronics testing is aninteresting one. Studies being undertaken at the Center for Advanced Life CycleEngineering (CALCE) are showing that 6 DOF shakers are better at excitingresonances and reproducing failures in certain types of PCBs than repetitive shocktesting (a.k.a. HALT). Over time, this could represent a significant shift intest methodology for electronics testing.

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6 DOF Shaker and Matrix Controller at CALCE

Although many shakers are available inoff-the-shelf configurations, currently most multi degree of freedom shakersystems are custom built per requirement. Considerations regarding the shakertype (electrodynamic vs. servo hydraulic), the table requirements, reactionmass requirements, and couplings are very important to the design of thesesystems. It is always recommended to work with reputable professionals inbuilding MDOF vibration test systems.

A proper multishaker vibration controlleris required to accurately and effectively control multishaker tests. Alldegrees of freedom that are not physically constrained should be controlled.For MDOF tests, a multishaker vibration controller is required because all ofthe actuators affect all of the test points in a rigid or flexible body. Formultishaker single axis tests, additional issues such as impedance mismatchingbetween shakers, load imbalance, and structural dynamics make a truemultishaker controller very necessary for maintaining control withoutundergoing painstaking efforts of complex fixtures, couplings, and systemmatching.

Data Physics controllers use a pretestmethod for system identification to generate the first drive signal of a test.In multishaker testing, this pretest phase is more critical than in generalsingle shaker tests, and requires careful evaluation. The FRF and multicoherence measurements provide valuable information to determinecontrollability of the test and preferred control points.

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Multi Coherence Functions of 6 DOF Test atCALCE

Careful consideration of sensor location isrequired in both field data acquisition and lab simulation. As many users havefound, a mistake in location or direction can make running a test not possible.Additionally, it is important to be sure the data points are spatially locatedto adequately define the degrees of freedom in the test.


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风冷、水冷电磁振动台
传感器校准系统、振动源
模态激振器、惯性激振器
扭转振动台、角振动台
水声换能器、水下振动台
模拟运输振动台(液压)
模拟运输振动台(机械)
模拟运输振动台(多自由度)
冲击台、冲击试验机
斜面冲击试验机
水平冲击系统
包装堆码压力试验机
包装跌落试验机
CUBE六自由度振动系统
振动台振动控制器
2~1024通道振动、噪声分析仪
冲击、跌落波形测量分析仪
运输振动、冲击、气候记录仪
各类传感器、模态力锤
MEscope模态分析软件