Force limited vibration testing (notching) limits the upper vibration level on any number of control or measurement channels, thus effectively protecting test items against overtesting. Overtesting occurs when vibration tests subject a test item to unrealistically severe – and potentially damaging – forces arising at resonances present in the component or fixture.
m+p VibControl software and m+p VibRunner hardware have proved highly successful for force limiting vibration testing. During tests, the m+p system applies a predetermined sine or random vibration excitation to the assembly, but this is limited if the sum of individual forces in the excitation axis, the root sum square of the acceleration vector at each point, or the overturning moment exceed their set limits.
To learn more about m+p international’s solution for effective force limited vibration testing, please read the article “Shake, Rattle & Roll” in the June 2104 issue of the “Aerospace Testing International” magazine.
Impact noise characterized by high peak value and short duration is a very common source of noise in industry and in many cases it can be summed up in the noise radiated by the collision of two cylinders. Our customer at Xi’an Jiaotong University in China established a modified theoretical prediction model based on the Palmgren’s cylinder contact empirical model and acoustics theory. The students presented a numerical simulation combining the finite element method (FEM) and the transient boundary element method to verify the modified theoretical model.
For experimental validation, they used the m+p SO Analyzer for dynamic signal analysis along with a 4-channel USB-powered acquisition module from National Instruments.
Read more in the 8-page paper “Theoretical and numerical investigation on impact noise radiated by collision of two cylinders”.
m+p international has local offices and representatives throughout the world. Recently, we started a co-operation with Marubun Corporation to market our products for vibration control and noise & vibration analysis in Japan. Their headquarters are located in Tokyo, they have offices in several Asian countries and the US.
Over 700 employees work for Marubun, business activities include equipment for manufacturing, material inspection, measurement and optical communication as well as electronic devices and semiconductors. Find more information on the Marubun website.
m+p international will be exhibiting at three events this fall. Take the opportunity to get a demo on our solutions for comprehensive vibration testing and noise and vibration measurement and analysis.
85th Shock & Vibration Symposium
October 26-30, 2014
Reston, VA (near Washington, D.C.)
Booth # FYR5
Automotive Testing Expo North America 2014
October 28-30, 2014
46100 Grand River
Booth # 7044
28th Space Simulation Conference
November 3-6, 2014
Table Top # 29
Well, that brings to a close this edition of the m+p international Newsletter. If there are items of information you would like to see here or if you have useful tips for the rest of the environmental test world, then please send us your pointers and we'll include them in the next edition.
Please forward this Newsletter to your colleagues if you have found it of interest, spread the word...
m+p international Marketing Team
m+p international listens to customers...