3M India chooses Simcenter testing solutions to help car makers reduce interior noise

Automotive original equipment manufacturers (OEMs) today focus on reducing the weight of a vehicle’s body and chassis to achieve better fuel efficiency: it takes less energy to power a lighter object. Car components must therefore follow the same trend and use ever lighter materials, such as polymers or carbon fibers, for example. Without a doubt, these advanced materials impact fuel economy as well as safety and performance.

Designing lighter automobiles opens the door for a variety of innovative solutions around acoustics. Materials suppliers face yet another new challenge: they must bring solutions to the table that reduce noise effectively without adding content weight to the car. With more than two decades of experience in the field, 3M in Bangalore, India is one such supplier that understands these modern challenges and is perfectly equipped to meet the market’s expectations. 3M counts on Simcenter™ solutions – Simcenter Testlab™ software and Simcenter SCADAS™ Mobile hardware – from Siemens Digital Industries Software to offer increasingly better offerings to their customers.

Reduced noise, vibration and harshness (NVH) and improved energy

In order to better evaluate the acoustic material characteristics of its products, 3M decided to open its own research and development (R&D) center. Siemens Digital Industries Software engineers played a key role in setting up the acoustic lab on the 3M premises in Bangalore by providing specialized equipment, test solutions and expert advice. This in-house test facility substantially reduces the testing time and helps 3M improve its competence in regards to noise and vibration testing as well as R&D.

“Looking at the automotive market and tendencies to date, it is clear that automotive OEMs focus on three fundamental aspects: cost, weight and quality of performance,” says Dhritisunder Bhattacharya, general manager of the transportation division at 3M India. “Therefore, we do our best to develop products that fit within these requirements. Our noise-absorbent solutions use materials that fully respond to these criteria and we are happy to say that Simcenter testing solutions brought a tremendous contribution to our service for customers.”

Bhattacharya notes, “Ever since we partnered with Siemens Digital Industries Software in India, we discovered we had a more solid offer. We do not merely provide OEMs with the products they need, but we give them a true end-to-end solution, from customized assessment and advice on the specific use of materials to a complete system. With Simcenter Testlab software and Simcenter SCADAS Mobile hardware, we have a scalable suite for noise and vibration testing, an integrated platform that is equally convenient for lab use or in-field measurements.”

3M India opted for sound absorption and transmission loss testing, using both the impedance tube (ISO10534 standard) and the room methods (ISO 354 and ISO 140-3) as well as modal testing (for computing damping and loss factor).

Besides laboratory testing, the company uses the same Simcenter equipment in-vehicle for sound intensity testing.

Additionally, 3M India used Simcenter testing solutions to analyze and optimize the material content dedicated to vibration damping. The impact hammer, for example, helps 3M determine the loss factor and the damping coefficient of damper materials, which is used as input for simulation models. All of these enable 3M to offer complete end-to-end acoustic engineering solutions.

The right NVH solutions with the right partner

One of 3M’s biggest challenges as a supplier in a demanding and fast-changing industry is addressing individual customer needs.

“Our activities are built on our continuous efforts to understand and offer the most adapted products to suit a customer’s business,” says Satish V. Palled, advanced engineer at 3M India. “Every OEM is different and the smallest change in the car design might have a significant impact on the end product. This is why it is essential to carry out sufficient measurements that cover various scenarios in order to create and give the best possible advice.”

“As we customize our offer, the systems put in place by Simcenter testing solutions help us conduct complex processes more effectively and efficiently,” Palled continues. “To go through the simulation phase, for instance, we need a lot of input parameters. With the Simcenter solutions, we have extra flexibility to get the material properties faster. We then feed them into the vibro-acoustic simulation process and finally bring them to our customers in full confidence.”

To optimize its products, various diagnostics are carried out in the reverberation chamber. There, acoustic engineers take measurements to help optimize the acoustic characteristics of components. The intent is to have a clearer view on how the noise propagates through the components that have a specific type of acoustic behavior. By using Simcenter testing solutions such as intensity mapping, 3M India can also have a more accurate understanding of acoustical weak spots.

“The color map showing the different noise sources and weak spots saves us the cost and effort of having to re-engineer the entire product,” says Alex Varghese, technical manager of NVH at 3M India. “It also helps us keep the promise we make to our customers every single day: offering them solutions that strike an excellent balance among cost-efficiency, weight and performance for their vehicles.”

The future is lightweight

As the trend of lightweighting in vehicle design continues its journey, 3M’s use of the test-dedicated Simcenter solutions from Siemens Digital Industries Software also moves forward.

“Our goal is to continue to put all efforts into developing competitive lightweight solutions for the acoustic market,” says Bhattacharya. “But there are many other areas where we believe we can and should evolve, acoustically speaking, and Simcenter testing solutions will play a central role in those too. As the quest to improve fuel efficiency grows and the techniques to send power from the engine to the axle expand, the need for innovative materials rises.”

Bhattacharya hopes to see a growing partnership and continued use of Simcenter solutions in the future. “At 3M India, our highly skilled engineers make sure that we supply strong, quality products,” he says. “The majority of the proven capabilities of our products come through Simcenter evaluation systems. We would like to see our collaboration growing further as we continue to work together for improved industry solutions that help 3M accomplish our greatest mission: touching human lives with scientific applications.”