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Laser surface treatment machine for Ariane 6 Cryogenic Tanks

Electroimpact-Jeremy FERRER
  • Technical Paper
  • 2019-01-1897
To be published on 2019-09-16 by SAE International in United States
Surface treatment of cryogenic tanks (liquid oxygen and liquid hydrogen) for the Ariane 6 Space Launcher is a critical step for the adhesion of insulation materials. This operation is currently performed by the help of chemical products which are for some of them carcinogenic, mutagenic and repro-toxic. The large tank dimensions require using an important quantity of those products which generate massive recurring costs and health and environment problems. ArianeGroup has previously qualified and patented the Laser Surface Treatment as a replacement solution to chemical process. The aim is to use energy provided by infrared laser beam to modify the top layer of the tank surface. The chosen technology is Nd-YAG pulsed laser. Electroimpact has been chosen to carry out the industrial application. The main components of the laser system are a laser source, to generate the laser beam, an optic fiber to transport the beam and an optic with galvo mirrors to focus and move the laser on the part. The optic scan field is about 50 x 50mm, so it needs to be…
 
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Load Indicating Devices in Lifting Crane Service

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J376_201906
  • Current
Published 2019-06-10 by SAE International in United States
This SAE Recommended Practice applies to cranes equipped with load indicating devices used in lifting crane service.
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Brake Effectiveness Marking for Brake Blocks - Truck and Bus

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J1801_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE Recommended Practice provides the method to assign numerical values of brake effectiveness, using data from single station inertia dynamometer effectiveness tests, and to identify a uniform procedure to mark these values on the edge of brake blocks in excess of 12.7 mm (0.51 in) in thickness.

 
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Brake Block Effectiveness Rating

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J1802_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE Recommended Practice provides the test procedure and methods to calculate the effectiveness of brake blocks, using an inertia dynamometer. To minimize testing variability, and to optimize standardization and correlation, a single, high volume size of brake block is specified (FMSI No. 4515E) and evaluated in a reference S-cam brake assembly of 419 mm x 178 mm (16.5 in x 7.0 in) size, using a specified brake drum.

 
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Marine Electrical Switches

Marine Technical Steering Committee
  • Ground Vehicle Standard
  • J1320_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE Recommended Practice covers the requirements for switches used in marine applications both under and over 50 V.

 
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Hydraulic Excavator Operator Controls

MTC C5, Excavators
  • Ground Vehicle Standard
  • J1177_201906
  • Current
Published 2019-06-06 by SAE International in United States

This standard covers mobile hydraulic excavator controls and the specific arrangement and direction of motion for the primary controls. This standard applies to mobile hydraulic excavators as described in ISO 7135 - Earthmoving Machinery - Hydraulic excavators - Terminology and commercial specifications, and ISO 6165- Earthmoving Machinery - Basic Types - Vocabulary. Purpose This standard is intended as a guide for designing uniform two lever type operating controls for mobile hydraulic excavators, either wheel mounted or crawler mounted on independently reversible tracks.

 
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Design and Development of Partial Engine Encapsulation for Interior Noise Reduction in Commercial Vehicles

VE Commercial Vehicles, Ltd.-Sourabh Jadhav, Saahil Saxena, Yadhu S. Aswan
Published 2019-06-05 by SAE International in United States
This paper focuses on partial encapsulation technique for reducing air-borne noise from the rocker cover of a commercial vehicle diesel engine. Due to increasing awareness, customers demand for improvised NVH-Noise Vibration and Harshness performance in modern day vehicles. Better NVH performance implies better comfort for passengers as well as vehicle operator. This further increases the driver up time due to reduced driver fatigue. In order to improve NVH performance of existing vehicle and observe different noise and vibration zones, detailed noise and vibration mapping was carried out on one of our vehicle platform. It is observed that engine noise is one of the major contributors for interior noise, apart from road inputs etc. There are well established methods to reduce the inherent noise of the engine, but the same might affect other performance parameters including fuel efficiency and exhaust emissions, which are pain areas of major automotive industries due to stringent homologation norms. Engine top area partial encapsulation with barrier cover is designed considering various integration as well as heat load constraints at vehicle level.…
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Vibro-Acoustic Analysis for Modeling Propeller Shaft Liner Material

General Motors-Rajith R. Jayaratne, Yu Liu, Mark Gehringer, Jeff Rayce, Wallace Hill
Published 2019-06-05 by SAE International in United States
In recent truck applications, single-piece large-diameter propshafts, in lieu of two-piece propshafts, have become more prevalent to reduce cost and mass. These large-diameter props, however, amplify driveline radiated noise. The challenge presented is to optimize prop shaft modal tuning to achieve acceptable radiated noise levels. Historically, CAE methods and capabilities have not been able to accurately predict propshaft airborne noise making it impossible to cascade subsystem noise requirements needed to achieve desired vehicle level performance. As a result, late and costly changes can be needed to make a given vehicle commercially acceptable for N&V performance prior to launch.This paper will cover the development of a two-step CAE method to predict modal characteristics and airborne noise sensitivities of large-diameter single piece aluminum propshafts fitted with different liner treatments. The first step is the use of a traditional CAE software to calculate prop surface response. The second step is a boundary element simulation to calculate prop surface radiated noise under the excitation obtained from the first step. Finally, acceleration and acoustic test data are presented to assess…
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Drivetrain Noise Source Identification and Active Noise Control of a Heavy Off-Road Vehicle

Dongfeng Motor Technical Center-Zuguo Xia
Gissing Tech. Co., Ltd.-Hailin Ruan, Wei Huang, Longchen Li, Xiaojun Chen, Xiujie Tian, Keda Zhu, Changwei Zheng, Jiapeng Zhao, Renjie Dai
Published 2019-06-05 by SAE International in United States
Drivetrain noise from heavy off-road vehicles mainly includes engine noise, drive shaft noise, wheel-side gear noise, tire pattern noise etc. They are the main noise sources for such vehicles as they greatly influence the ride comfort of the passengers inside. This paper solved the drivetrain noise problems of a heavy off-road vehicle using the method of active noise control (ANC). Firstly, the vehicle is benchmarked and the noise problems are analyzed, while the noise sources are identified by analyzing the transmission principles of the drivetrain. Secondly, ANC strategies are made for the vehicle based on the noise profiles under various operating conditions. Thirdly, the multiple parameters for ANC are computed from simulations modeling the vehicle in idle, constant speed and acceleration respectively. Lastly, road tests are conducted using the multiple parameters from the simulations and a noise reduction of 2-4 dB can be achieved in the whole vehicle. The results has shown that ANC is an effective method for drivetrain noise reduction in heavy off-road vehicles as this paper provides references for the systematic solution…
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Structural-Acoustic Modeling and Optimization of a Submarine Pressure Hull

Michigan Engineering Services, LLC-Geng Zhang
University of Michigan-James Spain, Nickolas Vlahopoulos
Published 2019-06-05 by SAE International in United States
The Energy Finite Element Analysis (EFEA) has been validated in the past through comparison with test data for computing the structural vibration and the radiated noise for Naval systems in the mid to high frequency range. A main benefit of the method is that it enables fast computations for full scale models. This capability is exploited by using the EFEA for a submarine pressure hull design optimization study. A generic but representative pressure hull is considered. Design variables associated with the dimensions of the king frames, the thickness of the pressure hull in the vicinity of the excitation (the latter is considered to be applied on the king frames of the machinery room), the dimensions of the frames, and the damping applied on the hull are adjusted during the optimization process in order to minimize the radiated noise in the frequency range from 1,000Hz to 16,000Hz. Constraints on the total amount of damping that can be used are considered (resource driven constraints) and structural collapse constraints are also taken into account in order to avoid…
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