Vehicle Seat Comfort Measurement System - CASIMIR and MEMOSIK Virtual Passenger Models

The comfort of seats at Woelfel is measured using two sets of equipment: the virtual passenger model CASIMIR for software simulation and the actual vibration measurement dummy MEMOSIK, both specifically designed for seat comfort testing. The former is used for computer simulation passenger comfort testing in vehicle seat development, while the latter (MEMOSIK) is used for testing during real vehicle test drives. Both are commonly used for comfort evaluation and are also used to define standards for seat comfort and reproducibility.

MEMOSIK – A physical dummy for vibration measurement

MEMOSIK is a representative product of Woelfel for evaluating vehicle seat comfort, capable of assessing passenger comfort on a vibration testing machine and during actual driving. The dummy is designed to simulate the vibrations experienced by a typical driver in the seat, allowing test engineers to avoid acting as test passengers. This method is based on reproducing the "dynamic quality" of the driver.

MEMOSIK's intelligent feedback control system can quickly adjust to simulate the following three types of drivers:

Small female driver (f05)

Medium male driver (m50)

Tall male driver (m95)

After driving tests, MOMESIK can provide the following measurement results:

The transfer function in the vertical direction of the seat and its vibration characteristics.

The amount of vibration transmitted to the driver through the seat, including comfort evaluation.

MEMOSIK is a vibration measurement dummy made of a steel frame and electronic devices, and its counterpart in the virtual world is our digital passenger simulation model CASIMIR.

CASIMIR/Automotive – Computer-aided engineering software for seat comfort analysis

CASIMIR/Automotive is a simulation tool developed by Woelfel for analyzing vehicle seat comfort using digital models. It can also be integrated into existing workflows using HyperMesh and ABAQUS/Standard as finite element analysis solving software.

This software can calculate the following seat comfort parameters:

Static pressure distribution of the seat

Interaction between the human body and the metal frame

H-point defined by SAE J826

Backset value defined in FMVSS 208

Transfer function of the seat in the X, Y, and Z directions

Vibration experienced by passengers during driving

The process of developing seats using CASIMIR/Automotive is similar to general seat development methods, including the following analyses:

Seat structure

Unoccupied state

Occupied state

Users can review various design results at any time through the planning management program. To cover practical application ranges,

in addition to general body types, CASIMIR can simulate small and tall driver types, and users can also use the "posture processing program" to adjustthe driver's posture during the simulation process.

CASIMIR/Automotive can use the "material management program" to handle the settings of seat covers and foam materials, building a database of processed seat materials for future analysis.