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Advanced Impedance Analysis

ISO 7626 Mechanical Impedance Analysis: Precision Characterization for Automotive and Mechanical Engineering

Precise Mechanical Impedance Analysis according to ISO 7626

SADAP offers high-precision mechanical impedance analysis in accordance with ISO 7626 – the international standard for characterizing dynamic systems. Our detailed measurements capture the frequency-dependent transfer function between force and motion, providing precise data on stiffness, damping, and resonance behavior. These critical parameters enable improved vibration damping, reduced noise development, and optimized operational behavior of components. Our advanced measurement methods, combined with extensive expertise, provide valuable insights into the dynamic behavior of technical systems – essential for companies in automotive, e-mobility, and mechanical engineering who strive for the highest quality standards and optimal mechanical properties.

ISO 7626 Mechanical Impedance Analysis in Action

High-Precision Mechanical Impedance Analysis according to ISO 7626

Detailed Characterization of Dynamic Systems for Automotive, E-Mobility, and Mechanical Engineering

ISO 7626 Mechanical Impedance Analysis: Precise Characterization of Dynamic Systems

Why ISO 7626?

ISO 7626 defines the international standard for measuring and analyzing mechanical impedance – a crucial parameter for the comprehensive characterization of dynamic systems. This standard enables in-depth analysis of frequency-dependent transfer functions between force and motion (displacement, velocity, or acceleration) and provides valuable insights that often remain undiscovered with classical test methods.

As part of mechanical impedance analysis, input and output signals are captured with high precision and evaluated using advanced methods. This analytical technique allows for the exact quantification of dynamic stiffness and damping across a broad frequency range – decisive factors for the development of durable, low-noise, and vibration-optimized products.

  • Precise characterization of the mechanical transfer function of components and structures
  • Detailed analysis of resonance frequencies and damping properties
  • Identification of nonlinear effects in vibration behavior
  • Determination of frequency-dependent dynamic stiffness
  • Capture and optimization of energy dissipation in mechanical systems
  • Comprehensive evaluation of material damping properties

Challenges in Automotive & E-Mobility

In the automotive industry, and especially in e-mobility, precise characterization of mechanical components is crucial for driving comfort, NVH performance (Noise, Vibration, Harshness), and structural integrity. While the transition to electric drives eliminates combustion engines as the dominant source of noise and vibration, it makes other previously masked vibrations much more noticeable and presents new challenges for engineers.

Mechanical impedance analysis according to ISO 7626 provides detailed insights into the vibration behavior of critical components such as battery systems, drivetrain, and body structures. Through precise measurement of force-displacement transfer functions, damping concepts and isolation solutions can be exactly tailored to the specific requirements of modern vehicles.

  • Optimization of vehicle acoustics through precise damping characterization
  • Improvement of structural dynamics of battery systems and electric drives
  • Identification of critical resonances and vibration transmission paths
  • Targeted development of damping and isolation concepts
  • Quantitative evaluation of the efficiency of vibration control measures

Challenges in Mechanical Engineering & Industry

In industrial environments, vibration problems are a common cause of premature wear, material fatigue, and unexpected failures. Mechanical impedance analysis according to ISO 7626 offers a decisive advantage here: it enables the exact quantification of dynamic properties under real operating conditions and provides precise parameters for simulation models and structural optimizations.

By analyzing the frequency-dependent mechanical impedance, critical resonance ranges can be identified and design weaknesses located. This enables targeted optimization, whether through modifying stiffness, increasing damping, or adjusting mass distribution. Particularly valuable is the ability to recognize and quantify nonlinear system responses at different operating states – an important advantage over simplified linear models.

  • Characterization of the dynamic behavior of machine components
  • Identification of critical resonance frequencies to prevent damage during operation
  • Assessment and optimization of damping measures
  • Validation of design changes through precise before-after comparisons
  • Capture of nonlinear dependencies in mechanical behavior

High-End Testing Process

Our ISO 7626-compliant impedance analysis is based on a systematic methodology that ensures a comprehensive understanding of the dynamic properties of technical systems. The process begins with careful preparation and initial testing, followed by precise data acquisition and processing, before the actual impedance analysis and determination of dynamic stiffness are carried out.

The measurement systems used include high-precision shaker systems for defined force input, non-contact laser vibrometers for capturing the smallest movements, and powerful signal processing systems for complex data analysis. This combination enables the detection of even subtle dynamic effects across a wide frequency range from 0.1 Hz to 10 kHz.

Premium Testing Equipment

  • Precision Shaker System: Modal Shop (USA) with an excitation power of up to 2000 N and a frequency range from 0.1 Hz to 10 kHz
  • Measurement Technology: Keyence (Japan) with high-precision laser vibrometers for non-contact detection of the smallest deformations with nanometer-range resolution
  • Data Acquisition: Ono Sokki (Japan) with a sampling rate of up to 100 kHz and 24-bit resolution for highest signal fidelity

Detailed Analysis Process

Our ISO 7626-compliant analysis process follows a structured methodology consisting of four core phases, each with specific validation steps to ensure the highest data quality and measurement results.

Phase 1: Initial Check

The initial phase serves to ensure measurement data quality and includes critical checks to validate signal quality, sampling rate, and measurement time according to ISO 7626. Signal noise, coherence, and temporal synchronicity are checked to ensure an optimal data basis.

  • Sampling rate ≥ 5000 Hz for highest signal quality
  • Measurement duration ≥ 60 seconds for statistically significant data
  • Comprehensive background analysis for optimal signal-to-noise ratio

Phase 2: Data Preparation

This phase involves the precise synchronization of force and displacement data, the application of appropriate window functions, and the correction of possible signal distortions. The quality of data preparation is crucial for the precision of the subsequent impedance calculation.

  • High-precision time synchronization between force and displacement signals
  • Optimal signal preparation with adapted window functions
  • Verification of phase relationship for correct impedance determination

Phase 3: Impedance Analysis

The actual impedance calculation is performed using advanced signal processing techniques such as H1/H2 estimation or combined frequency/time domain analyses. The transfer functions between force and motion are determined over the relevant frequency range (5-2000 Hz).

  • Single-point or multi-point analysis depending on system complexity
  • Coherence analysis (≥ 0.95) to ensure valid measurement data
  • Frequency resolution ≤ 1.0 Hz for detailed resonance analysis

Phase 4: Dynamic Stiffness

In the final phase, dynamic stiffness and damping properties are derived from the mechanical impedance. This includes analysis of the real and imaginary parts of the impedance as well as a comprehensive uncertainty assessment according to international guidelines.

  • Calculation of dynamic stiffness and loss factor
  • Identification of resonances and critical frequency ranges
  • Comprehensive uncertainty analysis with confidence intervals for all measured values

Adaptive Solutions

At SADAP, we adapt to your individual requirements. While we offer you complete test solutions with our ISO 7626 impedance analysis services, we also develop powerful software for companies that want to conduct their tests themselves.

Discover our DynamInspect Software – the same technology we use in our laboratory, now available for your internal test processes.

Your Customized Testing Program

Benefit from our modern measurement technology and advanced analysis methods. Whether modal analysis, vibration testing, or mechanical impedance measurement - we offer precise and standard-compliant testing for your specific requirements. Contact us for detailed insights into the dynamic behavior of your structures.