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Accelerating Automotive Excellence in the Test Lab

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The automotive industry has many regulations and requirements in place to ensure vehicle safety and reliability of all vehicles. The responsibility for validating these standards of quality primary falls on the automotive original equipment manufacturer, who often rely on test labs to assess product specifications, safety, quality, and durability. Working together, the OEM and test labs are responsible for confirming regulations and requirements are met on every vehicle, part, component and sub-component that hits the market.

Interface understands that test labs need the very best in terms of testing devices and equipment. Interface, a supplier to automotive testing labs for decades, has a broad range of products used in all types of torque, force, and weighing applications. Accelerating Automotive Excellence With Interface Testing Lab Solutions is a new case study that details common challenges and solutions offered by Interface to fit the requirements of today’s modern automotive industry testing lab.

Our products are used all types automotive testing lab applications. These products include:

  • Load Cells and Various Force Measurement Devices
  • Rotary and Reaction Torque Transducers
  • Weight Measurement Equipment
  • Calibration Grade Devices
  • Test Stands and Load Frames
  • Analog and Digital Instrumentation
  • Data Acquisition Systems

Quality, accuracy and durability are key considerations for the type of measurement device selected for different tests, whether it is for brake caliper testing or in airbag connector tests.

General Automotive Lab Test Types

  • Component and Sub-Component Level Testing
  • Suspension Testing, including component level, such as shocks, springs and subframes and multi-post shaker rigs
  • Durability Testing, such as seats, window frames, material
  • Safety Testing such as crush, seat belt testing, and airbag mounts
  • Crash Walls

For general automotive testing solutions, key considerations for auto testing lab requirements are high cycle count capabilities and load cell integration in actuation systems. Our products are used for off-axis and impact loading and measuring test article failure net results. The equipment can be exposed to many environmental challenges so load cell ruggedization is very important to lab professionals.

Automotive Driveline Test Types

  • Engine and Motor Performance and Durability Tests
  • Engine and Motor Efficiency Testing
  • Power Analyzation (Electric)
  • Driveline Durability and Efficiency
  • Component Testing
  • Accessory Drive Testing

For automotive driveline testing, considerations on equipment include peak torque ratings, rotating torque capabilities. Easy transducer integration with couplings matters for these tests. Additional factors for equipment include signal requirements, environmental conditions, noise levels, both electrical and mechanical and vibration. The devices used in testing article failure are very important for evaluating net results.

Test labs also prefer precision sensors for critical tests, which include our 1200 Series LowProfile™ Load Cells with their special moment compensated design. Popular ruggedized Interface products used in automotive testing include our 2400 series and 3200 series Stainless Steel LowProfile™ Load Cells and our WMC Miniature Load Cells

With a wide range of automotive vehicle load cell sensors, force and torque measurement capabilities and features such as moment compensation, temperature compensation, and mechanical overload protection, Interface can help you design a solution perfect for your automotive application. We also offer custom one-off sensors and special application-specific designs.

To learn more about testing lab solutions, be sure to tune into our Interface Testing Lab Essentials Webinar.

Accelerating Automotive Excellence with Interface Testing Lab Solutions Case Study

What is Moment Compensation?

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Moment compensation refers to a process of adjusting or counterbalancing the effects of an external force or torque, known as a moment, on a system or object. This is often done in engineering or physics contexts where precise control and stability are required, such as the design of force measurement applications.

Moment compensation is often used to prevent unwanted movements or deformations in systems, to ensure precision and accuracy in measurements, or to maintain stability and control during operation. Moment compensated load cells improve accuracy by compensating for the impact of external forces and moments on the measurement, allowing for more precise and reliable measurements.

Most load cells are sensitive to orientation and loading concentricity. When external forces or moments are introduced, measurement errors are more common and reduce the accuracy of the readings. These external forces or moments can come from various sources. Examples of external forces or moments that can affect the accuracy of load cells and require moment compensation:

  • Off-axis loading: When the load is applied off-center to the load cell, it creates a moment that can introduce errors in the measurement.
  • Temperature changes: Changes in temperature can cause thermal expansion or contraction of the load cell, which can introduce measurement errors.
  • Vibration: Vibrations from nearby equipment or processes can cause the load cell to vibrate, creating measurement errors.
  • Changes in orientation or position: Changes in the orientation or position of the load cell can cause gravitational forces or other external forces to act on the load cell, affecting the measurement.
  • Torque: When a load cell is subject to torque, such as twisting or bending forces, it can introduce measurement errors.
  • Wind or air currents: Air currents or wind can create external forces on the load cell that can affect the measurement

A load cell that is moment compensated can minimize or eliminate these errors, resulting in higher accuracy. Load cells with moment compensation can be more sensitive to slight changes in the load, as it can compensate for any external forces or moments that might affect the measurement.

Moment Compensation is an Interface Differentiator

Interface’s moment compensation process reduces force measurement errors due to eccentric loads by deliberately loading cell eccentrically, rotating load, monitoring and recording output signal, and then making internal adjustments to minimize errors. Every product we ship must pass moment compensation specifications and performance requirements. Every Interface LowProfile™ load cell is moment compensated to minimize sensitivity to extraneous loads, a differentiator from other load cell manufacturers.

When load cells are moment compensated, they can be used in a wider range of applications, including those with complex or dynamic loads, which might be difficult or impossible to measure accurately using a load cell without moment compensation. Interface’s LowProfile Load Cell models have the intrinsic capability of canceling moment loads because of its radial design. The radial flexure beams are precision machined to balance the on-axis loading.

Moment compensated load cells are designed to counteract the external forces or moments by using a configuration of strain gages and electronics that can detect and compensate for these forces. The strain gages are arranged in a way that allows the load cell to measure the force applied to it in multiple directions, and the electronics can then use this information to calculate the impact of external forces and moments on the measurement.

Interface uses eight gages, as opposed to the four used by many manufacturers, which helps to further minimize error from the loads not being perfectly aligned. Slight discrepancies between gage outputs are carefully measured and each load cell is adjusted to further reduce extraneous load sensitivity to meet exact specifications.

Moment compensation improves the stability of a load cell, particularly in situations where the load is off-center or subject to torque. This can prevent the load cell from shifting or becoming damaged, leading to more consistent and reliable measurements. It also improves the durability of a load cell, as it can help protect it from the impact of external forces or moments that might cause damage or wear over time.

ADDITIONAL RESOURCES

Addressing Off-Axis Loads and Temperature Sensitive Applications

Contributing Factors To Load Cell Accuracy

Off-Axis Loading 101

How Do Load Cells Work?

Load Cell 101 and What You Need to Know

Get an Inside Look at Interface’s Famously Blue Load Cells

Strain Gages 101

 

Addressing Off-Axis Loads and Temperature Sensitive Applications

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As technology progresses, one of the main differences we see over years and years of iteration on a wide range of consumer and commercial technology is miniaturization. There are hundreds of thousands of examples of advancing technology that went from the room-size of a mainframe decades ago, to a handheld device today. As technology grows more compact and convenient, the equipment used to design, test and manufacture these devices has to follow suit.

This is one of the driving factors for Interface to increase the product types and capabilities in our Load Button Load Cells and Interface Mini Load Cell products. Interface’s Load Button Load Cells are designed for customers who require the measurement of forces in a very confined space. They provide the most accuracy in as little space as possible. Diameters range from 1 inch to 3 inches, with heights from 0.39 inch to 1.5 inches.

For many years, load button load cells have been sensitive to off-axis, eccentric or misaligned loads. This means that if the load is not exactly perpendicular to the surface it’s resting on, the data could become skewed or inaccurate. All on-axis load generates some level, no matter how small, of off-axis extraneous components. This can cause a variety of challenges including slight inaccuracies and reduction of the load cells overload capacity.

With Interface’s family of load button load cells, we bring premium accuracy and repeatability, even under eccentric angular loading. The shaped load button has a spherical radius to help confine misaligned loads to the primary axis of the cell. Our design engineers and force measurement experts have purposefully tested applications under a wide variety of load conditions to ensure that the our load button series can continue to deliver premium performance. We have been extremely pleased with the results and continue to advance our offerings, including the soon to be released precision focused ConvexBT load button load cells.

The load button load cells’ size has in the past precluded the use of internal temperature compensation. We have redesigned our ultra precision product line of load buttons to ensure that this is no longer something the user has to account for when testing a product in certain environmental conditions.

Interface engineers have eliminated this issue by taking the technology out of the load button load cells cable and designing it back into the product. This ensures that temperature-sensitive applications do not suffer from errors caused by the load cell being exposed to different environmental conditions than the cable.

These new features open new possibilities to test compression force on a broader range of products and environments. To learn more about our ultra precision Load Cell Load Buttons and how it can make a difference in your design and testing process when dealing with tight and confined spaces, contact our Application Engineer experts here.

To see the complete line of Load Button Load Cells, visit here.  Watch for the release announcement of our new ultra precision ConvexBT product coming out this month.

Contributors:  James Richardson, Interface Mechanical Engineering Manager and Ted Larson, VP Product Management and Marketing

Source:  Interface Load Cell Field Guide