Browse Topic: Weather-stripping

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Development of Paint-Less Black Gloss Decorative Technology for Frame Molding2016-01-13314/5/2016
The need to add more color variations to the traditional black gloss has increased globally in recent years. The intention is for automobile manufacturers to differentiate their products in terms of appearance design. The most noticeable trend is to add embellishment around the front grill. The same trend can be seen in the areas around vehicle doors. It is most common to use a coating material to emphasize the black gloss. However, in overseas countries it is a challenge to meet the required appearance quality, and under the current circumstances CKD is imported from Japan to meet such requirements. Recently, a new film-transfer technique has been established that can express black gloss as well as any coating material by transferring the roughness of the film surface. It is achieved by crimping the PET film onto the vinyl-chloride surface after the extrusion molding is performed. Moreover, we have successfully localized this technique and reduced the manufacturing cost. Thus, the development process will be described.
Hanano, Shingo, Nagata, Kanehiro, Murase, Yusuke
Side Crash Pressure Sensor Prediction: An Improved Corpuscular Particle Method2012-01-00434/16/2012
In an attempt to predict the responses of side crash pressure sensors, the Corpuscular Particle Method (CPM) was adopted and enhanced in this research. Acceleration-based crash sensors have traditionally been used extensively in automotive industry to determine the air bag firing time in the event of a vehicle accident. The prediction of crash pulses obtained from the acceleration-based crash sensors by using computer simulations has been very challenging due to the high frequency and noisy responses obtained from the sensors, especially those installed in crash zones. As a result, the sensor algorithm developments for acceleration-based sensors are largely based on prototype testing. With the latest advancement in the crash sensor technology, side crash pressure sensors have emerged recently and are gradually replacing acceleration-based sensor for side impact applications. Unlike the acceleration-based crash sensors, the data recorded by the side crash pressure sensors exhibits lower frequency and less noisy responses which is more conductive for CAE prediction. In the attempt to predict the side crash pressure sensor responses, fourteen different benchmark tests were designed and conducted to provide data for model validations. The fourteen benchmark tests can be divided into three sets based on the structure designs. The first set of benchmark tests included a rectangular rigid container with one side being compressed while all other sides were fixed to simulate a piston compression condition. The second set of benchmark tests contained a rigid impactor or a deformable barrier hitting a rectangular steel box with and without a hole. Different speeds were chosen in the second set of benchmark tests to obtain the corresponding pressure responses. The third set of benchmark tests involved a rigid impactor or a deformable barrier hitting a real vehicle side door with different openings. In the baseline door test, the window weather strip and speaker were kept and all holes in door inner were closed to represent a production door. To ensure the robustness of CAE predictions for different door designs, the window weather strip was removed and some holes in the door inner were opened in some of the door benchmark tests. Computer models were created according to the corresponding test conditions. The CPM method originally developed in LS-DYNA to simulate the deployments of side air bags and side air curtains was adopted and improved in this research to predict the responses of the side crash pressure sensors. One of the main purposes of adopting such method in this project is trying to expand the application of the CPM method to problems that do not involve inflators. With major improvements in the CPM method through this research in the past two years, not only the responses of side crash pressure sensor can be predicted but also the computation time required to complete such simulations has been shortened. The development of the modeling methodology to predict the responses of the side crash pressure sensors will also make it possible to use computer simulations as part of side crash sensor development and results in more robust sensor firing algorithm.
Tyan, Tau, McClain, Ben, Arthurs, Kirk, Rupp, Jeffrey, Ghannam, Mahmoud, Bauch, David, Clark, Todd, Bhalsod, Dilip, Wang, Jason
Development of New Test Method for Compression Load and Permanent Deformation of Weather Strip2012-01-00214/16/2012
The automotive weather strip performs functions of isolating water, dust, noise and vibration from the outside. To achieve good sealing performance, weather strip should be designed to have the high contact force and wide contact area. The compression load of weather strip is important for closing force in initial quality, but the permanent deformation is used to predict influx of wind noise over long periods of time. To check these accurately and easily, a new test method is demanded. So this paper introduces a new test method to predict the compression load and permanent deformation of 3D full vehicle by using ABAQUS. Uniaxial tension and creep tests were conducted to obtain the material data. The lab test for the permanent deformation was accelerated at high temperature during shorter time of 300 hours. Herein Proposed test method can provide accurate prediction under the different loading conditions and section shapes, and will also save time and cost.
Park, Joonchul
French Door Open/Close Durability Evaluation by Multibody Dynamics Method2012-01-07584/16/2012
A method including Multi-Body Dynamics (MBD) and fatigue assessment process with modal approach was developed to predict Light Commercial Van (LCV) Rear French Doors open/close durability performance during early design stage to improve test detect ability. The nonlinear properties of joints, such as those on bolted housings or spot welds sheets and hem flange areas, can substantially influence the local and global results of a dynamic simulation. The Modal approach considers joint contact, by way of Joint Interface Modes (JIMs) by using Contact Subroutine (MAMBA) to co-simulate with MBD software to improve result quality. One of the main challenges is measuring the dynamic stiffness for the weather strip. A novel test method was used to measure the weather strip dynamic stiffness by conducting an “in-situ” test. For CAE simulation results, positive feedback was received from design and test engineers.
Chen, Ying, Lepley, David, Cutting, Charles, Araki, Toshihiro
Study of Minimum Door Closing Speed Analysis Method2011-01-07824/12/2011
The minimum door closing speed is an important target in vehicle door design. Engineers need a proper method to evaluate the door closing speed during the design phase. Analytical approaches are presented to solve the difficult issues in analyzing the minimum door closing speed. First, the weather strip is simplified into a discrete model with several spring elements. This method does not need to use 3-D contact analysis for the weather strip and can save computing time with acceptable accuracy. Second, the minimum closing speed is solved by using the energy equation which needs one iteration only. The method has high efficiency and can be used to evaluate the door closing speed effectively during the design phase.
Huang, Zhuo, Wu, Shen, Zhang, Linbo
Overslam Travel Reduction Using Robust Design2003-01-08723/3/2003
This paper is mainly focused on development of the methodology to predict the over-slam travel of the decklid using the LS DYNA model and the sensitivity of the parameters that affect the overslam travel such as weatherstrip, overslam bumper CLD and the location. The full factorial experiments approach is used for maximizing the possibility of finding a favorable result.
Kapadnis, Pravin, Im, Kee
Modeling of Airborne Tire Noise Transmission into Car Interior by Using the Vibro-acoustic Reciprocity and the Boundary Element Method9720465/20/1997
In this paper, the vibro-acoustic transmission characteristics are investigated in the view point of the airborne noise in the interior cavity due to the tire wall vibrations. The analysis is carried out by categorizing the airborne noise transfer path into the two separate consecutive events. First, the noise transfer from the vibrating tire wall to the exterior car panels is modeled by using the direct boundary element method (BEM). To this end, after discretizing the whole geometry of exterior body panels, tires, and ground into BEM models, vibro-acoustic transfer characteristics are investigated at several frequency components associated with the cavity resonances of tire. Here, cavity resonance frequencies of tire are estimated by BEM and the distribution of tire wall vibrations excited by a special vibro-acoustic source is measured at those frequencies. Acoustic pressure distribution over the exterior car panels can thus be predicted and the contribution of local vibrational velocity of tire wall to car panels are estimated by the vectorial summation of resultant acoustic pressures. Second, vibro-acoustic transfer functions between the various points of car panels and the receiver's ear position in the car interior is measured by utilizing the vibro-acoustic reciprocity principle. Combining these two transmission path models in series, the airborne noise transmission from tire wall vibration to driver's ear can be analyzed. From the results, contributions of tire wall vibration to the interior noise can be estimated and the main possible transmission paths of airborne tire noise can be identified.
Ih, Jeong-Guon, Kim, Bong-Ki
Applying Variation Simulation Analysis to 2-D Problems9102102/1/1991
Variation simulation analysis is a technology that has achieved broad popularity in the automobile, appliance, electrical machinery and other industries as a method of predicting and analyzing manufacturing variation due to tolerances of individual components and assembly operations. The technology is widely considered to be the only method to accurately analyze three dimensional variation problems. Recently, a substantial body of work has been developed which indicates that variation simulation analysis can provide major advantages over traditional methods even on two dimensional problems. Variation simulation analysis uses the Monte Carlo method to accurately simulate the effects of each individual tolerance distribution and complex relationships between individual tolerances can be defined. This article will go on to provide several examples of the variation simulation analysis method as applied to two dimensional parts and compare the results to traditional methods to demonstrate the accuracy improvements which can be achieved.
Sitko, Anthony G.
RIM Urethane/Vinyl Composites as interior Trim Parts8204232/1/1982
Approximately four years ago, new production process for automobile door liners was introduced in Europe. The process consisted of stretching a sheet of unsupported, expanded PVC over the mold cavity. The mold was closed and clamped and a polyurethane structural foam mixture was injected by the RIM method through the top half of the mold. The pressure and temperature of the expanding mixture forced the vinyl to conform to the contours of the cavity thus producing a finished door liner (polyurethane foam/vinyl composite). This process showed promise but had several drawbacks. Over the past two years, cycle times have been reduced to 2 minutes, intricate surface detail has been achieved and other formable surfaces have been substituted for the vinyls. These improvements have made it a candidate product for the U.S. auto industry.
Mann, Max F.
The Porsche 924 Body-Main Development Objectives7703112/1/1977
Functional design through aerodynamics, secondary safety, corrosion resistance, repairability, economic production and operation - such are the critical points to be observed during today's body development. The Porsche 924 realises these requirements by assuring simultaneously a high degree of functionality and economy.
Burst, Hermann E., Srock, Rainer
Preliminary Flight-Test Results of an Advanced Technology Light Twin-Engine Airplane (ATLIT)7604972/1/1976
The present status and flight-test results are presented for the ATLIT airplane. The ATLIT is a Piper PA-34 Seneca I modified by the installation of new wings incorporating the GA(W)-1 (Whitcomb) airfoil, reduced wing area, roll-control spoilers, and full-span Fowler flaps. Flight-test results on stall and spoiler roll characteristics show good agreement with wind-tunnel data. Maximum power-off lift coefficients are greater than 3.0 with flaps deflected 37°. With flaps down, spoiler deflections can produce roll helix angles in excess of 0.11 rad. Flight testing is planned to document climb and cruise performance, and supercritical propeller performance and noise characteristics. The airplane is scheduled for testing in the NASA-Langley Research Center Full-Scale Tunnel.
Holmes, Bruce J., Kohlman, David L., Crane, Harold L.
Plastic Fasteners for Automotive Applications6401431/1/1964
A short review of plastics available and suitable for the manufacture of plastic fasteners is presended. Advantages of fasteners made of plastic over those made of metal are explained. Illustrations of various representative types of plastic fasteners suitable for automotive manufacture, showing their design and use are included.
Hanneman, Walter M.
Hushing Automotive Noises6200901/1/1962
McDaniel, D. W.
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