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Exam Code: HH0-350 Practice test 2022 by team
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Killexams : Hitachi Specialist tricks - BingNews Search results Killexams : Hitachi Specialist tricks - BingNews Killexams : CFD for the Masses

Not many engineers would think of computation fluid dynamics as an easy discipline. In fact, some of the analysts who work on the toughest flow and heat transfer problems do little else. But does CFD have to be as specialized as it's become? The engineers and software developers at Blue Ridge Numerics don't think so.

"We've focused our efforts on making CFD more acceptable to the masses," says Ed Williams, the company's president and cofounder. Over the past five years, Williams and his team at Blue Ridge have created a new kind of CFD software that addresses the needs of non-specialist design engineers who want to run flow or thermal analyses early in the design process.

Called CFdesign, the software takes much of the sting out of CFD set-up. For one thing, it closely integrates with the geometry kernel of existing CAD systems, using native CAD data as the basis for the simulations. For another, it maintains an associative relationship with the CAD system, so that changes made to the model are reflected in the simulation's mesh and boundary conditions.

CFdesign also automates some of the tasks usually left to the discretion of an experienced analyst. For example, it generates a suitable mesh without user input. "The design engineer doesn't want to know about meshing," says Len Whitehead, Blue Ridge's director of operations. Or to take another important example, CFdesign has automatic convergence algorithms that decide when the analysis has run its course. "The software tells you when the analysis is finished," he says.

Best of all, engineers interact with the software "in their own language," says Rita Schnipke, Blue Ridge Numerics' cofounder and chief technology officer. Rather than specialized fluid dynamics inputs, engineers work with familiar engineering units. Thus, the software asks for inputs like GPM and PSI rather than Reynolds numbers and accelerators.

Finally, the software includes a design communication and review tool that allow engineers to view simulation results dynamically and in any cutting plane they choose. They can also share the results of their work as an HTML report for easy viewing by audiences that may lack CFD and CAD software.

The whole analysis process can take just a few minutes for a single iteration. In a latest demo on a notebook PC, Whitehead ran through the analysis of a fan blade in a sheet-metal housing in less than six minutes.

Despite its emphasis on ease-of-use, Blue Ridge didn't skimp on the physics. According to Schnipke, a PhD engineer who has contributed to more than 30 CFD codes over the course of her career, the software uses the same Navier-Stokes equations as other analysis software. She goes on to describe Blue Ridge's finite element solver as a finite element code that makes use of some finite volume tricks. "The truth is, we can model most anything that flows," she says.

That long list includes creeping to supersonic fluid flows. It includes compressible liquids. It includes a wide variety of heat transfer simulations, among them Joule heating. It includes electrical potential problems, such as current flow and voltage drop. Finally, it includes an expanding variety of motion problems-in which a solid object moves through a fluid. "This is not CFD for dummies," Schnipke says.

And one look at the company's growing roster of users backs her up. Customers include well-known OEMs such as Canon, Mitsubishi, Motorola, Hitachi, and Phillips. Applications have included medical imaging equipment, automotive systems, pumps, turbines, compressors, packaging equipment, HVAC systems, plumbing fixtures, and more. And it's started to make a mark in racing. Richard Childress Racing uses it. And so does Trek, the company that makes Lance Armstrong's bikes.

"It's really a diverse group of companies and applications," says Williams. And he predicts that the list of users will continue to grow at a rapid clip. "Wherever you have heat transfer or fluid flow problems, our chances are good," he says.

See more information including demos of CFdesign.

Thu, 30 Jun 2022 11:59:00 -0500 en text/html
Killexams : Chantiers To Start Delivering Tankers

Chantiers de l'Atlantique, a subsidiary of GEC Alsthom, is building five methane carriers for Petronas Marine of Malaysia. The keel for the first of the five tankers was laid in September 1992. This tanker will be delivered in July 1994; delivery of the remaining four ships will be staggered between July 1994 and July 1997. The 130,000-cu.-m. liquefied natural gas (LNG) carriers have been constructed using automated manufacturing and assembly processes. Each LNG carrier has four tanks which are incorporated in the ship's metal structure.

Thermal insulation for the liquid methane cargo is provided by a double layer of plywood boxes filled with perlite, an insulating powder made of volcanic materials.

Gastightness is ensured by a 0.7- mm-thick membrane made of Invar, a steel and nickel alloy which has an extremely low coefficient of thermal expansion. For safety reasons, a second, identical membrane is placed between the two layers of boxes to ensure tightness in the event of a leak in the first membrane. To minimize the cost of assembly operations aboard the ships, components have been extensively standardized and widespread use has been made of prefabrication techniques. The construction of a carrier requires 50,000 plywood boxes, each measuring 1 m (3.3 ft.) by 1.2 m (3.9 ft.), which are produced in a fully automated, purpose- built workshop on site. In addition, the special Invar parts forming the tank corner structures are made in completely pre-fabricated 10 foot (3 m) long elements.

Special attention has been given to optimizing the supply of the many components installed aboard the ship. Materials are delivered by the erectors themselves using the "justin- time" method with the aid of a computer system.

One of the first operations to be carried out inside the tanks is to weld metal elements called coupler studs to the ship's double hull, working from data provided by a precision topographical survey. The studs anchor the first layer of boxes. Chantiers de l'Atlantique has developed a special device for this purpose. The Dromadec system comprises a viewing unit, an onboard computer, a stud positioning arm and a welding torch. Using the topographical data provided by a laser and a distance measuring device, the computer places each coupler at the desired position before welding it automatically to the double hull. Dromadec reportedly makes it possible to achieve the precision specifications set for assembling the tank's insulation elements, namely a +/- 0.9 mm positioning accuracy for the studs relative to the topographical data.

Chantiers de l'Atlantique and a number of specialist firms have worked together to develop machines to automate the welding of May, 1994 33 the membranes and achieve maximum quality. A single ship requires 90,000 m of resistance seam welding and 21,000 m of TIG welding.

For more information on Chantiers de l'Atlantique

Tue, 05 Jul 2022 12:00:00 -0500 en text/html
Killexams : Doosan 7 Series Crawler Excavators Now Available in US, Canada

Available Doosan models include: DX140LCR-7, DX225LC-7, DX255LC-7 and DX350LC-7. The crawler excavators feature reinforced parts, updated controls and heavy-duty lifting capacities.


Doosan Infracore North America introduces its next-generation 7 Series crawler excavators in the United States and Canada. The launch includes four models, with more excavators to be announced in the coming months. The first models are the Doosan DX140LCR-7, DX225LC-7, DX255LC-7 and DX350LC-7.

“Doosan continues to build on the success of its existing excavator platform with more machine features that help our customers Boost their productivity,” said Joel Escalante, product specialist. “We’ve enhanced the excavator cab with additional comfort features and now offer an all-around view monitor for even better operator visibility of the jobsite.”

Updates to the 7 Series excavators include a work group with reinforced castings and forged steel pivot points for withstanding high-impact work. A new Y-shaped seal at the end of the excavator's arm provides sealing to the bucket connection.

Doosan added material to the excavator’s mainframe to support performance. The excavator’s X-Chassis undercarriage is durable and stable, while the track chain is sealed and self-lubricating for reduced maintenance. Cast-steel, heavy-duty sprockets are designed for challenging work environments, and track rollers and idlers are provided with oil level check plugs to support machine uptime.

Machine Interior

The redesigned models are built to reduce noise and vibration. Inside the cab includes an optional air-suspension seat that is heated and cooled, joystick controls and an 8-inch smart touch screen. The new cabs have a single wiper that clears both the top and bottom of the front window during inclement weather. Also included in the 7 Series is the Doosan smart key. The smart key fob brings automotive features to construction equipment. Operators can easily unlock the cab and start the excavator’s engine with the push of a button. The multilingual Doosan smart touch screen, standard on all 7 Series crawler excavators, displays settings and information on one screen. From the touch screen, operators can monitor machine functions and control machine settings, rearview camera, heating and cooling, radio and Bluetooth wireless technology.

All-Around View Monitoring (AVM) System

The optional 360-degree all-around view monitoring (AVM) camera system displays a full view of the machine’s surroundings. Five visual perspectives can be seen from the separate AVM monitor: top view, rear view, top+right view, rear+corner view and 3D view. The AVM camera system can be linked with optional ultrasonic detection sensors to monitor objects behind the machine.

Excavator Performance

The excavator's standard counterweight provides stability when using heavy attachments. With an optimal swing radius, lift height and tilt position, operators can lift and place loads and dig at the site.

The 7 Series crawler excavators (14 metric tons to 25 metric tons) offer an upgraded, cast push link with a reinforced lifting eye that delivers five metric-ton lifting capacity. This design allows operators to remove an attachment and lift directly to utilize the machine’s lifting capacity. New for the 7 Series is the fine swing function (14 metric tons to 25 metric tons). This function controls shaking of a lifted object that occurs at the beginning or end of the swing movement. Operators can activate it during certain lifting applications. This feature ensures safety in pipe laying and maintains the bucket heap.

Additionally, the new reduced tail swing counterweight design, along with the tighter front minimum swing radius on the reduced tail swing models, allows operators to work in confined areas — such as waste transfer stations and single-lane roadways. Doosan attachments are designed to match the excavator load ratings and hydraulic performance. A 16 gpm PTO (power take-off) pump improves the performance of various excavator attachments that require more hydraulic flow.


The DoosanCONNECT telematics system comes standard on all 7 Series crawler excavators, allowing customers to remotely monitor and maintain their machines. DoosanCONNECT telematics is an equipment diagnostic tool that monitors the health, location and productivity of Doosan construction equipment from a mobile app and website. The data pulled from the machines is uploaded automatically to the DoosanCONNECT online system using dual-mode communications (cellular and satellite). Doosan dealers can access the machine data and work with customers to resolve issues or make preventive maintenance recommendations to minimize downtime. With DoosanCONNECT telematics, customers can do the following:

  • Help prevent theft with a geofencing feature (GPS location tracking)
  • Avoid unauthorized use of the machine
  • See when maintenance is due
  • Customize alerts based on the customer’s schedule
  • Track oil pressure, operating temperature and more

Four Power Modes

Doosan continues to offer four selectable power modes, giving operators control over the excavator’s performance and helping reduce fuel consumption.

  • Power+ mode delivers fast speeds to save time when loading trucks
  • Power mode provides power and performance for tough digging and heavy lifting
  • Standard power mode addresses fuel consumption and delivers performance in everyday digging, grading and lifting
  • Economy mode reduces fuel consumption for low-demand applications and slows down machine movement, which is ideal for fine digging, light grading conditions and jobsite conditions that require extra precision

Coming Soon: Doosan DX225LC-7X Model

Available this year, Doosan is adding a new electronically controlled model with machine-assisted technologies. The fully electro-hydraulic control system on the DX225LC-7X crawler excavator enables machine guidance and machine control systems. This includes a 2D and upgradable 3D grading system for earthmoving and grading work.

This technology includes programmable joystick switches, a fully electronic joystick, a rotary sensor and equipment sensors on the boom, arm, bucket and upper body of the DX225LC-7X, including a laser catcher. This system allows the machine to provide assistance with precision functions and tasks.

DX225LC-7X Functions

  • Grade assist mode: The excavator operator can program the machine to control the boom and bucket functions while the arm in function is controlled by the operator
  • Bucket angle setting: Maintains the bucket at a specific angle
  • Swing assist: Sets the swing angle for repetitive digging tasks
  • Swing limit: The operator sets left and right swing limits (virtual walls). Virtual wall settings for arm out plus ceiling and floor limits to work in confined spaces
  • Weighing system: To measure and display material in the bucket and monitor totals when loading trucks
  • Lift assist mode: Monitors weight in the bucket, calculates tipping load and alerts operators to Boost safety

Doosan 7 Series Crawler Excavator Specs

DX140LCR-7 Replaces the DX140LCR-5

  • Horsepower: 115 hp (86 kW) at 2000 rpm
  • Operating weight: 33,800 lb. (15,400 kg)
  • Maximum digging depth: 19 ft. 8 in. (6 m)*
  • Maximum digging reach (ground): 28 ft. (8.5 m)
  • Maximum loading height: 23 ft. 3 in. (7.1 m)

*with 9 ft. 10 in. (3 m) arm

DX225LC-7 Replaces the DX225LC-5

  • Horsepower: 174 hp (129 kW) at 1800 rpm
  • Operating weight: 52,600 lb. (23,900 kg)
  • Maximum digging depth: 21 ft. 7 in. (6.6 m)*
  • Maximum digging reach (ground): 31 ft. 10 in. (9.7 m)
  • Maximum loading height: 22 ft. 5 in. (6.8 m)

*with 9 ft. 6 in. (2.9 m) arm

DX255LC-7 Replaces the DX255LC-5

  • Horsepower: 189 hp (141 kW) at 1900 rpm
  • Operating weight: 59,300 lb. (26,900 kg)
  • Maximum digging depth: 22 ft. 4 in. (6.8 m)*
  • Maximum digging reach (ground): 32 ft. 10 in. (10 m)
  • Maximum loading height: 23 ft. 1 in. (7 m)

*with 9 ft. 10 in. (3 m) arm

DX350LC-7 Replaces the DX350LC-5

  • Horsepower: 285 hp (213 kW) at 1800 rpm
  • Operating weight: 81,791 lb. (37,100 kg)
  • Maximum digging depth: 24 ft. 8 in. (7.5 m)
  • Maximum digging reach (ground): 35 ft. 11 in. (11 m)
  • Maximum loading height: 23 ft. 6 in. (7.2 m)
Thu, 28 Jul 2022 17:51:00 -0500 en-us text/html
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