The new shaker has an impressive shock force for a medium-sized electrodynamic shaker. How does this improve performance?JUMP TO:
1. How to improve performance with the LDS V8750 shaker system?
2. How to minimize inspection risks with the LDS V8750 shaker system?
3. How to reduce operating costs with the LDS V8750 shaker system?
4. How to increase efficiency with the LDS Inductive Centring System?
5. How to improve flexibility with the LDS V8750 shaker system?
Advanced technology has already become an integral part of our everyday lives. From cars to smartphones, electronic control units are installed and exposed to various forces in their daily use. To ensure that the built-in electronics can withstand the shock forces and meet the requirements of customers, markets and industry standards, high acceleration shock tests must be carried out (for example, 150 g 0.5 ms, 150 g 6 ms, 100 g 11 ms, 100 g 6 ms, 50 g 11 ms and 50 g 6 ms).
To achieve high shock performance on a medium-force air-cooled shaker, there has been two possibilities in the past:
- Buying an additional bigger and more powerful shaker.
- Using a specially designed and supplied matching transformer between the amplifier and the shaker. The matching transformer achieves optimum performance by using taps, which are normally limited to 2 – 3 tap ratios. New test requirements can be accommodated but will not have the optimum tap ratio to perform the test, thus limiting the payload.
On the one hand, these possibilities enabled the desired shock performance, but also increased the overall cost of the system.
The design of the new V8750 system with the XPAK amplifier architecture provides high shock performance as standard, built into the shaker design, eliminating the need for this type of specialist technology with its associated additional costs. The system meets these demanding shock test specifications with sensibly sized payloads in standard configurations, ensuring the reliability and futureproofing of LDS vibration test systems. The adjustable bay within the XPAK amplifier allows you to maximize the setup for each new shock test profile, so the amplifier can upgrade from the standard 48 kVA to the high shock 88 kVA amplifier if required.
Comparing the high shock performance with the LDS V875LS, the impressive increase in shock performance becomes clear once again. Besides not being able to run a 100 g 11 ms half sine shock pulse test with an LDS V875LS, a 50 kg payload mass is achievable with the V8750-XPA88K.
How does the new LDS V8750 + XPAK shaker system improve uptime?
Mechanical systems with moving parts need to be serviced and maintained to keep vibration test system performance and reliability at the highest level. To protect the investment and maximize uptime, the new remote service for the LDS V8750 XPAK shaker system – a new part of our service contracts – keeps your system performing at its best.
The LDS V8750 shaker system is equipped with standard and optional sensors that continuously monitor the condition of the system. This data is available in real time via the amplifier’s touchscreen interface and is stored in the amplifier for subsequent analysis to aid preventive maintenance and fault detection.
In addition, the system allows a connection for remote diagnostics and support from the HBK Service Team, via a customer LAN connection or via a 4G router connection to the HBK VPN server. Through customized service dashboards, based on the download and analysis of amplifier data, the HBK Service Team can assist with fault detection and diagnosis from anywhere.
Once the error is detected, you can make changes to the amplifier configuration via the touchscreen without the need for HBK Service to intervene, for example, changing modes, reducing the number of power modules used, changing limits. If more detailed analyses become necessary, optional remote access to the amplifier can also be provided – without having to be on site or to better prepare for necessary site visits. This remote-control software is also available for customers who wish to control and/or monitor the amplifier within the local network.
Can you explain in detail how the new shaker system improves the acoustic noise and the energy efficient usage?
Vibration testing with a shaker consumes a lot of energy, which can significantly increase the cost of a test. Also, some automotive testing procedures, such as durability testing or squeak and rattle, can be affected by the noise of the fan. With the COOL and QUIET modes of the LDS XPAK amplifier system it is possible to reduce the energy consumption while at the same time reducing the cost of ownership, and the acoustic noise. Due to their specific characteristics, both modes can only be used separately.
The COOL mode is built into the amplifier that automatically adjusts the system settings to reduce the power consumption required for the test. COOL mode can be manually activated and deactivated on the amplifier’s touchscreen display, with estimated savings (kVA) and power (kVA and % of maximum power) displayed when activated.
The reduction in power consumption is achieved by monitoring temperatures via thermocouples direct on the armature and the shaker field coils, as well as the voltage and current required for the test. In addition, the fan speed and the field strength of the shaker are adapted to the respective test, which on the one hand significantly reduces the noise level and, on the other hand, saves considerable operating costs depending on the test level.
Comparing the typical power savings of the LDS V875LS and the V8750, a significant reduction can be achieved with COOL mode. For example, at 25% operating power, power consumption can be reduced by 66%. Using your shaker annually at 25% operating power and an annual operating power ratio of 70%, this results in an annual saving of 162 MWh or 27.75 tonnes CO2 – an emission equivalent to 6.3 times a flight around the circumference of the earth or 14.8 times a flight from London to Sydney.
In QUIET mode, the system runs with the shaker fan off, minimizing the noise generated by the system. The amplifier setting has also been optimized to increase the signal-to-noise ratio. These aspects are particularly useful for low-power applications (squeaks and rattles and durability tests).
Since the system runs without cooling during operation, the temperature of the shaker is monitored throughout the test to protect the system from overheating. Also, the fan can be switched on at the end of the test to quickly cool the shaker back down to ambient temperature.
The new shaker comes with a built-in inductive centring system. What is the benefit of that?
The centring system of a shaker positions the armature within the shaker to ensure that the correct (maximum) amount of displacement can be achieved for the required vibration profile. There are different ways to centre an armature, but the typical armature sensor uses optical technologies because this type of technology operates in the electromagnetic environment of a shaker’s armature.
With optical technology comes increased requirements, such as the constant recalibration and cleaning of the sensor as it is affected by dust or moisture, which is common in test environments. This increases maintenance intervals and downtime, thus reducing efficiency. In the worst case, a malfunctioning sensor can also damage the entire shaker and the payload under test.
Although inductive sensors are not typically used because they cannot cope with the electromagnetic environment, the LDS V8750’s built-in inductive centring system (ICS) uses inductive means as well as new technology to make it immune to the effects of the electromagnetic environment.
The ICS, HBK’s inductive centring system, automatically holds the armature in its centre position during a vibration test, ensuring that high displacement tests can be performed repeatedly and without accidental shutdowns due to interlock trips. This makes the ICS immune to the variables that can cause armature drift, such as dust and heat, offering greater reliability. But this is just the beginning. The ICS is maintenance free, giving you peace of mind when running your tests. You will not need to wait for routine in-field service or calibration of the sensor as no technical actions are needed.
With the new LDS V8750 + XPAK shaker system comes a modular design for ease of upgrade. What does this mean for flexibility?
The V8750 is available with two possible armature sizes (440 and 640 mm diameter) on base-mounted air isolation or Lin-E-Air air isolated trunnions, and the XPAK amplifier is available in 48 and 88 kVA variants. Based on the standard configuration, you can choose other options that are suitable for initial use, and there is the possibility to upgrade the capacity of your system later. Choose from the following options to flexibly upgrade your system:
Shaker System Equipment
- LDS® Head Expanders (guided and unguided) increases the effective mounting surface to accommodate larger or numerous payloads
- LDS® Thermal Barriers/Extenders protect the shaker from high and low temperatures, enabling the use of climatic chambers during environmental testing. HBK works closely together with manufacturers of climatic chambers
- LDS® Slip Tables are ideal when testing applications in three individual axes. Due to its modular design, a future expansion of a vertical V8750 system to V8750 combo system with slip table, can be done on site, allowing you to split investment costs
In addition, HBK runs the vibration test systems with the right analysis and design software, as well as data acquisition hardware and software, which enable durability and reliability testing – simultaneously or independently:
- HBK accelerometers and other transducers such as force transducers or strain gauges
- LASERUSB controller for the shaker control
- Data acquisition hardware and software, to monitor test specimens during the shaker test
- LDS Maintenance, calibration, repair, training, and maintenance contracts for your shaker system
- HBK Prenscia software to design a representative test based on fatigue damage equivalence
Watch our digital launch event and discover the next generation of vibration testing!
Talk to your local Brüel & Kjær representative today!
Selecting the right equipment for your measurement
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