{"id":2606,"date":"2019-01-25T12:57:17","date_gmt":"2019-01-25T17:57:17","guid":{"rendered":"https:\/\/testrium.com\/?p=2606"},"modified":"2020-07-07T08:14:40","modified_gmt":"2020-07-07T12:14:40","slug":"automotive-bsr-testing","status":"publish","type":"post","link":"https:\/\/testrium.com\/automotive-bsr-testing\/","title":{"rendered":"Automotive BSR Testing"},"content":{"rendered":"\r\n

How do I conduct a BSR test?<\/h2>\r\n\r\n\r\n\r\n
\"automotive<\/figure>\r\n\r\n\r\n\r\n

A BSR (buzz, squeak and rattle) test is deceptively simple to perform. All you need to do is shake the object that you\u2019re interested in evaluating and listen for any noise that emanates from the object. For smaller light objects that\u2019s what an engineer can actually do to get a sense of whether there are any really noticeable BSR issues present.<\/p>\r\n\r\n\r\n\r\n

But performing a accredited buzz, squeak and rattle test is a bit more complicated. In addition to the device that you are going to test, you\u2019ll need a fixture to attach the device to a shaker, a shaker capable of vibrating the combined fixture\/device package with the required energy and frequency distribution, an environment which is quiet enough not to mask the noise produced by the device plus a microphone and data acquisition\/sound quality analysis system<\/a>.<\/p>\r\n\r\n\r\n\r\n

Once you\u2019ve got all of these things together, the device is usually vibrated with the necessary profile for a short period of time while the sound acquisition system logs a few seconds of data from the microphone. The data is then analysed to define the necessary sound metric required by the test specification.<\/p>\r\n\r\n\r\n\r\n

What should I look for in BSR test results?<\/h2>\r\n\r\n\r\n\r\n

Many BSR specifications<\/a> still require a simple maximum A-weighted sound pressure measurement for the duration of the test. Most modern BSR specifications require the Zwicker loudness also known as N10 loudness to be reported. You are looking for a result which is lower than the maximum defined in the specification. Read <\/em>Trends in Vehicle NVH Testing<\/em><\/a><\/p>\r\n\r\n\r\n\r\n

When is the right time to conduct a BSR test?<\/h2>\r\n\r\n\r\n\r\n

The BSR phenomenon occurs when you have friction between incompatible material pairs moving in relation to each other. So, as soon as you have an assembly which is close enough to your production assembly as far as materials clearances\/interferences are concerned a first BSR test be considered. The later in the development process this test is left, the more difficult it can be to mitigate BSR issues.<\/p>\r\n\r\n\r\n\r\n

Tips for choosing a BSR test lab<\/h2>\r\n\r\n\r\n\r\n