Abstract
ABSTRACTThe use of accelerometers to monitor the vibrations of either complex machinery or simple components involves some considerations about the mounting of the sensor to the structure. Different types of mounting solutions are commonly used, but in all cases they can be classified in one of these categories: stud mounting, screw mounting, adhesive mounting, magnetic mounting, and probe sensing. Indeed, each of them has a specific field of application depending on e.g. the mounting surface conditions, the temperature, the accessibility to the specific mounting point, etc. The choice of the mounting solution has an important effect on the accuracy of the usable frequency response of the accelerometer, since the higher the stiffness of the fixing, the higher the low-pass frequency limit of the mounting. This article specifically focuses on adhesive mounting of accelerometers, which includes a great number of different products from the temporary adhesives like the beeswax to the permanent ones like cyanoacrylate polymers. Among the variety of commercial adhesives, three specific products have been experimentally compared to assess their transmissivity and the results are reported in this article. A two-component methylmethacrylate (HBM X60), a modified silane (Terostat 737), and a cyanoacrylate (Loctite 454) adhesive have been used to join two aluminum bases, one connected to an accelerometer and the other to the head of electromagnetic shaker. A design of experiment (DOE) approach was used to test the system at several levels of amplitude and frequency of the external sinusoidal excitation supplied by the shaker.
Highlights
Different types of mounting solutions are commonly used, but in all cases they can be classified p in one of these categories: stud mounting, screw mounting, adhesive mounting, magnetic e mounting and probe sensing
This paper focuses on adhesive mounting of accelerometers, which includes a great number of different products from the temporary adhesives like the beeswax to the permanent ones like cyanoacrylate polymers
A two t component methylmethacrylate (HBM X60), a modified silane (Terostat 737) and a ip cyanoacrylate (Loctite 454) adhesives have been used to joint two aluminium bases, one r connected to an accelerometer and the other to the head of electromagnetic shaker
Summary
Different types of mounting solutions are commonly used, but in all cases they can be classified p in one of these categories: stud mounting, screw mounting, adhesive mounting, magnetic e mounting and probe sensing. Despite the wealth of information about t static mechanical properties of adhesive, like elastic modulus and strength, often supplied rip directly from the manufacturer, technical literature reports less information about the dynamic of c adhesives and mainly in case of high strain rate loading [6] and viscoelastic properties [7] This s work investigates the effects of different adhesives on the vibration monitoring commonly used u in industry. The vibrator signal is post-processed to extract two significant output parameters: the SAR, which is the amplitude of the power spectrum at the excitation frequency and its weight percent over the overall energy of the signal These data are elaborated with a statistical software t to evaluate which variable affects the system responses and which is the adhesive effect on the ip vibration monitoring. In the conclusions some relevant considerations are carried s out and some practical hints for the adhesive bonding of accelerometers are presented
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