Category : Uncategorized

Terry and His Drone


Jon W. Adams, Director of 3D Reality Capture ::::

A morning in the life of Terry Myers…

4:00 AM

It is the dead of night. Terry Myers stirs in his sleep, slowly awakening to the theme music from Law & Order. He did not fall asleep with the TV on, watching his favorite show… Instead, this is the ringtone that Terry has assigned to calls that come from his place of business, DJS Associates.

There is an emerging situation which requires a forensic field crew to investigate the scene where a traffic collision has occurred, just hours ago.

4:45 AM

Terry looks over his equipment packed in his Ford Escape (AKA DJS 1), mentally checking boxes, as he accounts for each tool he will need to utilize once he arrives at the scene. DJS protocols states that all site inspections are to include 3D laser scanning, terrestrial photographs and video, measuring wheel measurements, and data captured from a new perspective: the drone.

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Automatic Gate Closes on Man


Automatic Gate

John R. Yannaccone, PE, Senior Mechanical Engineer ::::

Case Synopsis: One evening at closing time, an employee at a self-storage facility opened an electric gate to allow a car to drive out of the facility. As the driver was leaving, he stopped his car in the path of the gate to talk to an employee and a customer. The customer was standing next to the stopped car, adjacent to the gate. Suddenly, the gate began to close and pinned the customer between the gate and the car. The driver moved forward to prevent the gate from hitting his car, but this caused the pinned customer to be twisted between the car and gate, resulting in additional injury.

Expert Analysis: By the time an engineer was retained to investigate the cause of the incident, the storage facility had replaced the gate operator and disposed of the system in use at the time of the incident. Based on the materials provided, the following was determined:

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Independent Recalls and Potential Vehicle Fire Concerns


vehicle-recall

R. Scott King, Principal Mechanical Engineer ::::

For obvious reasons, the prevention of vehicle fires, both crash and non-crash related, is and always has been a priority at the National Highway Traffic Safety Administration (NHTSA). When needed, NHTSA facilitates – and sometimes mandates – vehicle recalls to remedy potential defects. From identifying emerging failure trends, to providing remedial oversight, to monitoring consumer compliance rates, NHTSA remains an important element in minimizing vehicle fire risk. Recently, NHTSA issued several seemingly independent recalls of over 500,000 Kia and Hyundai vehicles due to potential fire concerns.

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We’ve Expanded All Across the United States


Expert Witness Consulting

DJS Associates’ consulting services has expanded to all across the continental United States, Puerto Rico and Alaska. Whether your case requires a structural engineer in Illinois, a recreational expert in Nevada, a bio-mechanical engineer in New Jersey, or a chemical engineer in Texas, our team is here to provide you with the most qualified consultant to meet your case needs. With professional and technical consultants across the US and beyond, we can quickly respond to collect and document scenes and render reports in a timely fashion. Click Here to see our expanding list of available areas of expertise.

Two Events, One Data Recorder


event-data-recorder-crash-data

R. Scott King, BSME, Principal Automotive / Mechanical Engineer ::::

While standing at their property edge, waiting for a school bus, a father and son were seriously injured when they were struck by a passing vehicle that had crossed the opposing travel lane and departed the roadway. The vehicle traveled a short distance after the initial incident and came to a controlled stop in the roadway. Then, after a brief delay, the vehicle accelerated, traveled a short distance, and struck a tree. After the incident, witnesses reported the operator of the impacting vehicle was using her cell phone and appeared confused.

The vehicle operator reported no recollection of the incident and police investigators found nothing to indicate a mechanical malfunction. This conclusion was confirmed by an independent forensic examination, which included downloading data from the vehicle’s Event Data Recorder (EDR). The information from the EDR included five seconds of pre-crash data, as well as a crash-pulse record quantifying the crash severity. This particular EDR could record data associated with only one event. In this case, there were two events: the initial impact with the father and son, and the second with the tree.

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Side-by-Side (SSV) & Watercraft Electronic Event Data


watercraft-event-data-recorder

Robert S. Kinder, Jr., MS, Mechanical Engineer ::::

Over time the number of electronic devices and features in motorized vehicles has generally increased, some of which can record diagnostic or personal information. Most automobiles manufactured today are equipped with (EDR) capable of storing retrievable data including vehicle speed, braking, and other parameters. More recently, cars are not the only vehicles storing data. Newer Side-by-Side (SSV) off-road vehicles and watercrafts have Engine Control Modules (ECM). These electronic devices are responsible for keeping the engine running smoothly. To complete that task, the devices monitor data from various sensors and systems. When a problem is identified, the ECM can log diagnostic fault codes. In addition to fault codes, some ECMs can record up to 60 seconds of data including vehicle speeds. Using diagnostic tools, ECM data can be retrieved to provide insight as to how fast a watercraft or SSV was traveling during the last approximate one minute of usage or its past and current diagnostic condition.

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