Physical Test
It is the principle of ESTECH that physical test is the first step to identify the mechanism of problems by digitalization and visualization, which improves quality of a product such as product performance, cost and weight reductions in general.
The principle " Physical test and computer simulation is right and left wheels of a vehicle" has been promoted by ESTECH since the company was founded. The data obtained by physical test contain enormous information which is quite essential to execute computer simulation.
ESTECH possesses its own test facilities, named "ESTECH Technology Development Center" and “Sound Laboratories” consisting of premises and test equipment, which is an advantage of the company and enables the company to adopt "Physical Test-Driven CAE" as its slogan as well as to take on a package deal of physical test and computer simulation.
The company has a wealth of experience from vibration, noise, strain and displacement measurement to motion capture with a high-speed camera. The followings are examples such as micro-strain measurement using a semiconductor strain gauge, micro-vibration measurement using a laser vibration meter, and large displacement measurement using a wire-type displacement meter. Professional engineers provide highly reliable physical test measurement and analysis.
Mechanism analyses of noise & vibration and motion of mechanical structures are backyards of ESTECH and the structures to be analyzed are automobile, electronic & electric hardware, construction machinery, space aircraft, railway vehicle, marine vessel, chemical plant, general machinery and amusement rides and so on. Test engineers conduct physical test not only in ESTECH test facilities but also at any location where they can visit with test equipment if it is required.
ESTECH Experimental Technologies
Motion Capture
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.
Test Modal 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.
Rapid Measurement of Moment of Inertia
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.
Noise Source Detecting Measurement
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 Laboratory.
Vibrationally Equivalent Rig Model Development
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 generatesgenerate noise & vibration individually on its bench test, which noise & vibration prediction by CAE model is highly demanded.
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.
