793 C XQ.pdf

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793C XQ
Mining Truck
®
Engine
Engine Model
Gross Power
Flywheel Power
Weights – Approximate
Gross Machine
Operating Weight
Operating Specifications
Nominal Payload Capacity
Cat
®
3516B HD EUI
1711 kW
2,294 hp
1611 kW
2,160 hp
383 743 kg
846,000 lb
218 tonnes
240 tons
793C XQ Mining Truck
Specifically designed for high production hauling in sound sensitive environments.
Environmentally Responsible Design
The 793C XQ not only helps build
a better world, it helps maintain and
preserve the fragile environment
while allowing mining and residential
development to peacefully co-exist.
pg. 4
Cooling System
Hydraulically driven twin fan radiator
minimizes sound and maximizes
cooling capacity.
pg. 5
Engine
Electronically controlled and
mechanical sound reduction features
reduce engine source noise and absorb
sound while maximizing hauling
performance.
pg. 6
The purpose built 793C XQ (Extra Quiet)
Mining Truck features an innovative sound
reduction package designed to minimize
environmental impact and preserve quality
of life in residential mining areas. The sound
reduction system is integrated into the truck
system and built to meet the durability,
reliability and serviceability expectations
of Cat customers.
2
Exhaust System
The high efficiency muffler and sound
barrier help keep the 793C XQ extra
quiet.
pg. 8
Structures and Driveline
Sound barrier and damping materials
dampen vibration and reduce structural
noise for a quieter ride.
pg. 9
Serviceability
Designed with serviceability in mind
to keep your mining truck on the
haul roads.
pg. 10
3
Environmentally Responsible Design
The 793C XQ not only helps build a better world, it helps maintain and preserve the fragile
environment while allowing mining and residential development to peacefully co-exist.
Sound Treatments.
Caterpillar applied various sound treatment
options to reduce noise on the sound suppressed 793C XQ.
•
Source Reduction.
Reduces sound emissions directly from
the prime source. Electronic and mechanical modifications
to the engine and cooling system were used to significantly
reduce sound emission levels.
Absorption.
Specially designed treatments are used
throughout the design to absorb sound generated by prime
sources on the truck.
Barriers.
Materials are strategically placed to block
sound paths and reflect it back to the absorption material,
preventing a majority of the sound from reaching the
environment. All materials are fire resistant.
Damping.
Damping materials are used to reduce sound
generated by motion, such as rattling of components
attached to the vehicle structure that occurs when the
engine is running and the truck is moving.
•
•
•
Hunter Valley, Australia
Quiet Operation.
Sound suppressed machinery plays a
significant role in mitigating the impact of noise in the
environment. With the development of the 793C XQ,
Caterpillar leads the way in the production of sound reduced
off-highway trucks for operation in sound sensitive mining
areas. Designed specifically for regions with stringent noise
limitations, sound power levels on the 793C were reduced
approximately 9 dB(A) making the sound power level on the
793C XQ less than one-eighth the sound level of the standard
truck. This effectively means that eight sound reduced trucks
emit the same level of sound as a single standard truck,
significantly reducing environmental impact and improving
quality of life.
Sound Modeling.
Through the use of the Caterpillar proprietary
Sonic+ sound modeling software, sound treatment options
were modeled for the complete truck system. Extensive sound
testing was conducted to confirm effectiveness of the model
and sound treatments. Optimum sound reduction was achieved
by applying sound reduction treatments to the 793C XQ
engine, cooling system, exhaust system and driveline.
Sound Level Comparison.
The static sound power level on
the sound reduced 793C XQ was measured at approximately
112 dB(A) per ISO 6393 test method compared with a static
level of approximately 121 dB(A) on the standard 793C.
The graph below shows the logarithmic scale of decibels
and how that slight reductions in decibels can make a
tremendous impact on sound levels in the environment.
Static Spectator Sound Levels
122
119
116
113
110
Decibels – dB(A)
4
Cooling System
Hydraulically driven twin fan radiator minimizes sound and maximizes cooling capacity.
Cooling System.
The fan is a major noise contributor on
mining trucks. And, a considerable amount of fan and engine
noise can escape through the radiator. The addition of engine
enclosures on the 793C XQ further increased the potential
for added noise with greater cooling requirements. A sound
suppressed cooling system was designed using proprietary
Caterpillar software to model the effects of the engine
enclosure on airflow and cooling efficiency. The result is
a dual, side-by-side radiator design with two fans and a
grill equipped with special sound absorbing materials.
Acoustic Grill
Twin-Fan Radiator
Twin-Fan Radiator.
The 793C XQ uses dual fans to increase
cooling capacity while minimizing noise. The dual fans are
quieter and more efficient than the single fan they replace.
The smaller electronically controlled fans are driven by
hydraulics instead of a belt driven direct drive system and
provides variable speed control, which allows the fans to run
only when necessary to maintain proper cooling. This design
maximizes airflow and minimizes sound since the fans can
operate at a slower rpm, which reduces blade tip noise.
When conditions require less cooling, they are even quieter
and conserve engine power for better hauling performance.
Baffles
Grill.
The specially engineered acoustic grill uses a patented
grid of baffles to absorb sound from the engine and fan to
keep noise from transmitting through the radiator. The grill is
lightweight and modular for easy assembly, disassembly and
serviceability. Formed metal channels are used to protect the
sound absorbing materials from damage.
Fan Hydraulics
5

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