scholarly journals Combination of an Improved FRF-Based Substructure Synthesis and Power Flow Method with Application to Vehicle Axle Noise Analysis

2008 ◽  
Vol 15 (1) ◽  
pp. 51-60 ◽  
Author(s):  
C.Q. Liu
Keyword(s):  
Power Flow ◽  
Noise Analysis ◽  
Flow Analysis ◽  
Synthesis Method ◽  
The Body ◽  
Vehicle Body ◽  
Total System ◽  
Simple Formulation ◽  
Substructure Synthesis ◽  
Fea Model

In this paper, an improved FRF-based substructure synthesis method combined with power flow analysis is presented and is used for performing a vehicle axle noise analysis. The major transfer paths of axle noise transmitted from chassis to vehicle body are identified and ranked based on power flows transmitted through bushings between the chassis and body. To calculate the power flows, it is necessary to know the reaction forces and the vibrations at the bushing locations on the body side. To this end, the body is represented in terms of experimentally derived frequency response functions (FRF's) at the bushing locations, and the FRF's are coupled with the FEA model of the chassis for performing a total system dynamic analysis. This paper also describes how the FRF's of the vehicle body and the frequency dependent stiffness data of the bushings can be combined together with a simple formulation to better represent the dynamic characteristics of a full vehicle. A classical example is used to illustrates the concept of the method, and the method is then applied to a vehicle axle noise analysis with detailed procedure. The theoretical predictions are compared with experimentally measured results. Good correlation has been obtained.

Control of structure-borne noise for a vehicle body by using power flow analysis and acoustic path participation method

2020 ◽  
Vol 157 ◽  
pp. 106981 ◽  
Author(s):  
Yongliang Wang ◽  
Chihua Lu ◽  
Xunpeng Qin ◽  
Song Huang ◽  
Xiaodong Tan ◽  
...  
Keyword(s):  
Power Flow ◽  
Flow Analysis ◽  
Vehicle Body ◽  
Acoustic Path ◽  
Power Flow Analysis

scholarly journals Wearable Flexible Antenna for UWB On-Body and Implant Communications

Telecom ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 285-301
Author(s):  
Mariella Särestöniemi ◽  
Marko Sonkki ◽  
Sami Myllymäki ◽  
Carlos Pomalaza-Raez
Keyword(s):  
Power Flow ◽  
Flexible Substrate ◽  
Flow Analysis ◽  
Substrate Material ◽  
The Body ◽  
Ultra Wideband ◽  
Antenna Performance ◽  
Compact Size ◽  
Simulation Results ◽  
Flexible Antenna

This paper describes the development and evaluation of an on-body flexible antenna designed for an in-body application, as well as on-body communications at ISM and UWB frequency bands. The evaluation is performed via electromagnetic simulations using the Dassault Simulia CST Studio Suite. A planar tissue layer model, as well as a human voxel model from the human abdominal area, are used to study the antenna characteristics next to human tissues. Power flow analysis is presented to understand the power flow on the body surface as well as within the tissues. Simulation results show that this wearable flexible antenna is suitable for in-body communications in the intestinal area, e.g., for capsule endoscopy, in the industrial, scientific, and medical (ISM) band and at lower ultra-wideband (UWB). At higher frequencies, the antenna is suitable for on-body communications as well as in-body communications with lower propagation depth requirements. Additionally, an antenna prototype has been prepared and the antenna performance is verified with several on-body measurements. The measurement results show a good match with the simulation results. The novelty of the proposed antenna is a compact size and the flexible substrate material, which makes it feasible and practical for several different medical diagnosis and monitoring applications.

scholarly journals Full Vehicle Vibration and Noise Analysis Based on Substructure Power Flow

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Zhien Liu ◽  
Shuai Yuan ◽  
Shenghao Xiao ◽  
Songze Du ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Power Flow ◽  
Vibration Isolation ◽  
Noise Analysis ◽  
Solution Process ◽  
Low Frequency ◽  
Vehicle Body ◽  
Frequency Noise ◽  
Vehicle Interior ◽  
Computation Efficiency

Combining substructure and power flow theory, in this paper an external program is written to control MSC. Nastran solution process and the substructure frequency response are also formulated accordingly. Based on a simple vehicle model, characteristics of vibration, noise, and power flow are studied, respectively. After being compared with the result of conventional FEM (finite element method), the new method is confirmed to be feasible. When it comes to a vehicle with the problem of low-frequency noise, finite element models of substructures for vehicle body and chassis are established, respectively. In addition, substructure power flow method is also employed to examine the transfer characteristics of multidimensional vibration energy for the whole vehicle system. By virtue of the adjustment stiffness of drive shaft support and bushes at rear suspension lower arm, the vehicle interior noise is decreased by about 3 dB when the engine speed is near 1050 rpm and 1650 rpm in experiment. At the same time, this method can increase the computation efficiency by 78%, 38%, and 98% when it comes to the optimization of chassis structure, body structure, and vibration isolation components, respectively.

scholarly journals ANALISIS ALIRAN FLUIDA PADA PERMUKAAN BODI KENDARAAN LISTRIK GANESHA SCOOTER UNDERWATER BERBASIS SOFTWARE SOLIDWORKS

2018 ◽  
Vol 6 (3) ◽  
pp. 121
Author(s):  
Vidsvara Putra Krisnanandha ◽  
Kadek Rihendra Dantes ◽  
I Nyoman Pasek Nugraha
Keyword(s):  
Fluid Flow ◽  
Drag Coefficient ◽  
Electric Vehicle ◽  
Flow Analysis ◽  
The Body ◽  
Vehicle Body ◽  
Marine Tourism ◽  
Average Value ◽  
Body Design ◽  
Fluid Flow Analysis

Menyelam merupakan salah satu kegiatan yang dilakukan manusia didalam air. Kegiatan tersebut memiliki banyak tujuan seperti olahraga, penjelajah, melihat keindahan wisata bahari dan bahkan penelitian. Oleh karena itu dibutuhkan alat bantu kendaraan untuk memudahkan manusia dalam menyelam atau bergerak didalam air, merancang sebuah kendaraan yang harus diperhatikan adalah komponen-komponen salah satunya bodi kendaraan. Dalam sebuah bentuk rancangan bodi akan terjadi sebuah fenomena aliran fluida yang menyebabkan terjadi sebuah gaya hambat (drag) yang sering dianggap menggangu atau menghambat pergerakan sebuah kendaraan yang melalui sebuah fluida. Untuk itu, analisis aliran fluida pada bodi kendaraan listrik Ganesha Scooter Underwater dengan menggunakan software Solidworks 2018 dengan tujuan untuk mengetahui karakteristik dan besaran coefficient of drag. Setelah melakukan analisis dengan menggunakan software Solidworks 2018 bodi kendaraan listrik Ganesha Scooter Underwater mendapatkan penurunan nilai rata-rata pressure sebesar 4,25%, nilai velocity meningkat 2,9% dan nilai coefficient of drag menurun 8,38% setelah dilakukan modifikasi desain bodi kendaraan listrik Ganesha Scooter Underwater. Dapat dikatakan desain modifikasi lebih aerodinamis dibandingkan desain standar.Kata Kunci : aliran fluida, software solidworks, bodi, coefficient of drag. Diving is one of the activities carried out by humans in water. These activities have many goals such as sports, explorers, seeing the beauty of marine tourism and even research. Therefore a vehicle tool is needed to make it easier for humans to dive or move in the water, designing a vehicle that must be considered are the components of one of the vehicle bodies. In a body design form there will be a phenomenon of fluid flow that causes a drag to occur which is often considered to interfere with or inhibit the movement of a vehicle through a fluid. For this reason, fluid flow analysis on the body of the electric vehicle Underwater Scooter using the software Solidworks 2018 with the aim to determine the characteristics and magnitude of the drag coefficient. After analyzing using Solidworks 2018 body of electric vehicle, Underwater Ganesha Scooter software has decreased the average value of pressure by 4.25%, velocity value increased by 2.9% and coefficient of drag value decreased by 8.38% after modification of vehicle body design Electric Ganesha Scooter Underwater. It can be said the modified design is more aerodynamic than the standard designkeyword : fluid flow, solidworks software, body, drag coefficient.

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