ESTECH Test Technologies
The followings are some of examples of test technologies the company possesses.
It is necessary to capture the motion of structures quantitatively with time history to analyze the mechanism of the dynamics in some cases. ESTECH conducts a hybrid analysis to solve kinematics mechanism of products by combining motion capturing test equipment and CAE mechanism analysis.
This technology has a lot of variations in parallel with required accuracy and agenda. It is necessary to select appropriate test equipment and instrument depending on the objectives and phenomena, otherwise reliability of measuring data won't be assured. ESTECH applies impact hammer, from ultra-small to large sizes, as well as electromagnetic shaker to execute highly accurate shaker test choosing the most suitable shaking condition.
Applying curve fitting technique to high accuracy excitation test data, vibration characteristics of the structure is extracted.
The example shows test modal analysis applying to a vehicle trimmed body without engine, powertrain, and suspension mainly.
The moment of inertia of a vehicle powertrain is one of the main factors to define a low frequency vibrational behavior of a vehicle. There are two legacy test methods, one is two points lifting sling method and the other is a one using a moment inertia measuring platform. However, these methods require a lot of manpower, time and cost, which is quite tedious and a bottle neck to conduct tests.
The method taking advantage of impact hammering test applies to a power plant to measure FRFs on a vehicle is shown as an example. After the measurement of FRFs, ESTECH software named ESTECH.Rmotion and ESTECH.[I]property are used to identify the moment of inertia of the power plant. Both software are ESTECH original software and developed based on accumulated physical test technologies and know-how over the years.
Detecting the noise source precisely is the first step to improve noise problem efficiently. The example shows the noise source detecting test on a vehicle in the ESTECH hemi-anechoic room located inside of ESTECH Technology Develop Center Sound Laobratory.
It is necessary to measure noise & vibration of not only assembly but also a single component of a mechanical structure. In the case of automobile, a single unit such as an engine, a transmission and a brake generates noise & vibration individually on its bench test, therefore there is a high demand for technology that predicts the vibration and noise on the bench using a CAE model.
However, the CAE modeling of bench test rig like a face plate attaching to a single unit component needs a significant amount of time because no approved drawings and no firm idea how to simplify the model.
The example shows how to develop vibrationally equivalent test rig model utilizing shaker test data for a single brake unit.
